String s
A String data type.
String n
A Number data type.
ByteBuffer b
A Binary data type.
List<E> sS
A String Set data type.
List<E> nS
A Number Set data type.
List<E> bS
A Binary Set data type.
Map<K,V> m
A Map of attribute values.
List<E> l
A List of attribute values.
Boolean nULLValue
A Null data type.
Boolean bOOL
A Boolean data type.
AttributeValue value
String action
Specifies how to perform the update. Valid values are PUT
(default), DELETE, and ADD. The behavior
depends on whether the specified primary key already exists in the table.
If an item with the specified Key is found in the table:
PUT - Adds the specified attribute to the item. If the
attribute already exists, it is replaced by the new value.
DELETE - If no value is specified, the attribute and its
value are removed from the item. The data type of the specified value
must match the existing value's data type.
If a set of values is specified, then those values are subtracted
from the old set. For example, if the attribute value was the set
[a,b,c] and the DELETE action specified
[a,c], then the final attribute value would be
[b]. Specifying an empty set is an error.
ADD - If the attribute does not already exist, then the
attribute and its values are added to the item. If the attribute does
exist, then the behavior of ADD depends on the data type of
the attribute:
If the existing attribute is a number, and if Value is also a number, then the Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
If you use ADD to increment or decrement a number value for
an item that doesn't exist before the update, DynamoDB uses 0 as the
initial value.
In addition, if you use ADD to update an existing item, and
intend to increment or decrement an attribute value which does not yet
exist, DynamoDB uses 0 as the initial value. For example,
suppose that the item you want to update does not yet have an attribute
named itemcount, but you decide to ADD the number
3 to this attribute anyway, even though it currently does
not exist. DynamoDB will create the itemcount attribute, set its
initial value to 0, and finally add 3 to it.
The result will be a new itemcount attribute in the item, with a
value of 3.
If the existing data type is a set, and if the Value is also a
set, then the Value is added to the existing set. (This is a
set operation, not mathematical addition.) For example, if the
attribute value was the set [1,2], and the ADD
action specified [3], then the final attribute value would
be [1,2,3]. An error occurs if an Add action is specified
for a set attribute and the attribute type specified does not match the
existing set type.
Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings. The same holds true for number sets and binary sets.
This action is only valid for an existing attribute whose data type is
number or is a set. Do not use ADD for any other data types.
If no item with the specified Key is found:
PUT - DynamoDB creates a new item with the specified primary
key, and then adds the attribute.
DELETE - Nothing happens; there is no attribute to delete.
ADD - DynamoDB creates an item with the supplied primary key
and number (or set of numbers) for the attribute value. The only data
types allowed are number and number set; no other data types can be
specified.
Map<K,V> requestItems
A map of one or more table names and, for each table, a map that describes one or more items to retrieve from that table. Each table name can be used only once per BatchGetItem request.
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly consistent read
is used; if false (the default), an eventually consistent
read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide the partition key value. For a composite key, you must provide both the partition key value and the sort key value.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet -
This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
String returnConsumedCapacity
Map<K,V> responses
A map of table name to a list of items. Each object in Responses consists of a table name, along with a map of attribute data consisting of the data type and attribute value.
Map<K,V> unprocessedKeys
A map of tables and their respective keys that were not processed with the current response. The UnprocessedKeys value is in the same form as RequestItems, so the value can be provided directly to a subsequent BatchGetItem operation. For more information, see RequestItems in the Request Parameters section.
Each element consists of:
Keys - An array of primary key attribute values that define specific items in the table.
AttributesToGet - One or more attributes to be retrieved from the table or index. By default, all attributes are returned. If a requested attribute is not found, it does not appear in the result.
ConsistentRead - The consistency of a read operation. If set to
true, then a strongly consistent read is used; otherwise, an
eventually consistent read is used.
If there are no unprocessed keys remaining, the response contains an empty UnprocessedKeys map.
List<E> consumedCapacity
The read capacity units consumed by the operation.
Each element consists of:
TableName - The table that consumed the provisioned throughput.
CapacityUnits - The total number of capacity units consumed.
Map<K,V> requestItems
A map of one or more table names and, for each table, a list of operations to be performed (DeleteRequest or PutRequest). Each element in the map consists of the following:
DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement:
Key - A map of primary key attribute values that uniquely identify the ! item. Each entry in this map consists of an attribute name and an attribute value. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement:
Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception.
If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
String returnConsumedCapacity
String returnItemCollectionMetrics
Determines whether item collection metrics are returned. If set to
SIZE, the response includes statistics about item
collections, if any, that were modified during the operation are returned
in the response. If set to NONE (the default), no statistics
are returned.
Map<K,V> unprocessedItems
A map of tables and requests against those tables that were not processed. The UnprocessedItems value is in the same form as RequestItems, so you can provide this value directly to a subsequent BatchGetItem operation. For more information, see RequestItems in the Request Parameters section.
Each UnprocessedItems entry consists of a table name and, for that table, a list of operations to perform (DeleteRequest or PutRequest).
DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement:
Key - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value.
PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement:
Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception.
If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
If there are no unprocessed items remaining, the response contains an empty UnprocessedItems map.
Map<K,V> itemCollectionMetrics
A list of tables that were processed by BatchWriteItem and, for each table, information about any item collections that were affected by individual DeleteItem or PutItem operations.
Each entry consists of the following subelements:
ItemCollectionKey - The partition key value of the item collection. This is the same as the partition key value of the item.
SizeEstimateRange - An estimate of item collection size, expressed in GB. This is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on the table. Use this estimate to measure whether a local secondary index is approaching its size limit.
The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.
List<E> consumedCapacity
The capacity units consumed by the operation.
Each element consists of:
TableName - The table that consumed the provisioned throughput.
CapacityUnits - The total number of capacity units consumed.
Double capacityUnits
The total number of capacity units consumed on a table or an index.
List<E> attributeValueList
One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
String comparisonOperator
A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
EQ : Equal. EQ is supported for all datatypes,
including lists and maps.
AttributeValueList can contain only one AttributeValue
element of type String, Number, Binary, String Set, Number Set, or Binary
Set. If an item contains an AttributeValue element of a different
type than the one provided in the request, the value does not match. For
example, {"S":"6"} does not equal {"N":"6"}.
Also, {"N":"6"} does not equal
{"NS":["6", "2", "1"]}.
NE : Not equal. NE is supported for all
datatypes, including lists and maps.
AttributeValueList can contain only one AttributeValue of
type String, Number, Binary, String Set, Number Set, or Binary Set. If an
item contains an AttributeValue of a different type than the one
provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
NOT_NULL : The attribute exists. NOT_NULL is
supported for all datatypes, including lists and maps.
This operator tests for the existence of an attribute, not its data type.
If the data type of attribute "a" is null, and you evaluate
it using NOT_NULL, the result is a Boolean true. This
result is because the attribute "a" exists; its data type is
not relevant to the NOT_NULL comparison operator.
NULL : The attribute does not exist. NULL is
supported for all datatypes, including lists and maps.
This operator tests for the nonexistence of an attribute, not its data
type. If the data type of attribute "a" is null, and you
evaluate it using NULL, the result is a Boolean
false. This is because the attribute "a" exists; its
data type is not relevant to the NULL comparison operator.
CONTAINS : Checks for a subsequence, or value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is of type String, then the operator checks
for a substring match. If the target attribute of the comparison is of
type Binary, then the operator looks for a subsequence of the target that
matches the input. If the target attribute of the comparison is a set ("
SS", "NS", or "BS"), then the
operator evaluates to true if it finds an exact match with any member of
the set.
CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "
b" cannot be a set, a map, or a list.
NOT_CONTAINS : Checks for absence of a subsequence, or
absence of a value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is a String, then the operator checks for the
absence of a substring match. If the target attribute of the comparison
is Binary, then the operator checks for the absence of a subsequence of
the target that matches the input. If the target attribute of the
comparison is a set ("SS", "NS", or "
BS"), then the operator evaluates to true if it does
not find an exact match with any member of the set.
NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a
" can be a list; however, "b" cannot be a set, a map, or a
list.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
IN : Checks for matching elements within two sets.
AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
String tableName
The name of the table that was affected by the operation.
Double capacityUnits
The total number of capacity units consumed by the operation.
Capacity table
The amount of throughput consumed on the table affected by the operation.
Map<K,V> localSecondaryIndexes
The amount of throughput consumed on each local index affected by the operation.
Map<K,V> globalSecondaryIndexes
The amount of throughput consumed on each global index affected by the operation.
String indexName
The name of the global secondary index to be created.
List<E> keySchema
The key schema for the global secondary index.
Projection projection
ProvisionedThroughput provisionedThroughput
List<E> attributeDefinitions
An array of attributes that describe the key schema for the table and indexes.
String tableName
The name of the table to create.
List<E> keySchema
Specifies the attributes that make up the primary key for a table or an index. The attributes in KeySchema must also be defined in the AttributeDefinitions array. For more information, see Data Model in the Amazon DynamoDB Developer Guide.
Each KeySchemaElement in the array is composed of:
AttributeName - The name of this key attribute.
KeyType - The role that the key attribute will assume:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
For a simple primary key (partition key), you must provide exactly one
element with a KeyType of HASH.
For a composite primary key (partition key and sort key), you must
provide exactly two elements, in this order: The first element must have
a KeyType of HASH, and the second element must have a
KeyType of RANGE.
For more information, see Specifying the Primary Key in the Amazon DynamoDB Developer Guide.
List<E> localSecondaryIndexes
One or more local secondary indexes (the maximum is five) to be created on the table. Each index is scoped to a given partition key value. There is a 10 GB size limit per partition key value; otherwise, the size of a local secondary index is unconstrained.
Each local secondary index in the array includes the following:
IndexName - The name of the local secondary index. Must be unique only for this table.
KeySchema - Specifies the key schema for the local secondary index. The key schema must begin with the same partition key as the table.
Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
ProjectionType - One of the following:
KEYS_ONLY - Only the index and primary keys are projected
into the index.
INCLUDE - Only the specified table attributes are projected
into the index. The list of projected attributes are in
NonKeyAttributes.
ALL - All of the table attributes are projected into the
index.
NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
List<E> globalSecondaryIndexes
One or more global secondary indexes (the maximum is five) to be created on the table. Each global secondary index in the array includes the following:
IndexName - The name of the global secondary index. Must be unique only for this table.
KeySchema - Specifies the key schema for the global secondary index.
Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
ProjectionType - One of the following:
KEYS_ONLY - Only the index and primary keys are projected
into the index.
INCLUDE - Only the specified table attributes are projected
into the index. The list of projected attributes are in
NonKeyAttributes.
ALL - All of the table attributes are projected into the
index.
NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
ProvisionedThroughput - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units.
ProvisionedThroughput provisionedThroughput
StreamSpecification streamSpecification
The settings for DynamoDB Streams on the table. These settings consist of:
StreamEnabled - Indicates whether Streams is to be enabled (true) or disabled (false).
StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the table's stream. Valid values for StreamViewType are:
KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
TableDescription tableDescription
String indexName
The name of the global secondary index to be deleted.
String tableName
The name of the table from which to delete the item.
Map<K,V> key
A map of attribute names to AttributeValue objects, representing the primary key of the item to delete.
For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
Map<K,V> expected
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A map of attribute/condition pairs. Expected provides a conditional block for the DeleteItem operation.
Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
Expected contains the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList. When performing the comparison, DynamoDB uses strongly consistent reads.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
EQ : Equal. EQ is supported for all datatypes,
including lists and maps.
AttributeValueList can contain only one AttributeValue
element of type String, Number, Binary, String Set, Number Set, or Binary
Set. If an item contains an AttributeValue element of a different
type than the one provided in the request, the value does not match. For
example, {"S":"6"} does not equal {"N":"6"}.
Also, {"N":"6"} does not equal
{"NS":["6", "2", "1"]}.
NE : Not equal. NE is supported for all
datatypes, including lists and maps.
AttributeValueList can contain only one AttributeValue of
type String, Number, Binary, String Set, Number Set, or Binary Set. If an
item contains an AttributeValue of a different type than the one
provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
NOT_NULL : The attribute exists. NOT_NULL is
supported for all datatypes, including lists and maps.
This operator tests for the existence of an attribute, not its data type.
If the data type of attribute "a" is null, and you evaluate
it using NOT_NULL, the result is a Boolean true. This
result is because the attribute "a" exists; its data type is
not relevant to the NOT_NULL comparison operator.
NULL : The attribute does not exist. NULL is
supported for all datatypes, including lists and maps.
This operator tests for the nonexistence of an attribute, not its data
type. If the data type of attribute "a" is null, and you
evaluate it using NULL, the result is a Boolean
false. This is because the attribute "a" exists; its
data type is not relevant to the NULL comparison operator.
CONTAINS : Checks for a subsequence, or value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is of type String, then the operator checks
for a substring match. If the target attribute of the comparison is of
type Binary, then the operator looks for a subsequence of the target that
matches the input. If the target attribute of the comparison is a set ("
SS", "NS", or "BS"), then the
operator evaluates to true if it finds an exact match with any member of
the set.
CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "
b" cannot be a set, a map, or a list.
NOT_CONTAINS : Checks for absence of a subsequence, or
absence of a value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is a String, then the operator checks for the
absence of a substring match. If the target attribute of the comparison
is Binary, then the operator checks for the absence of a subsequence of
the target that matches the input. If the target attribute of the
comparison is a set ("SS", "NS", or "
BS"), then the operator evaluates to true if it does
not find an exact match with any member of the set.
NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a
" can be a list; however, "b" cannot be a set, a map, or a
list.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
IN : Checks for matching elements within two sets.
AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator:
Value - A value for DynamoDB to compare with an attribute.
Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
If Exists is true, DynamoDB will check to see if that
attribute value already exists in the table. If it is found, then the
condition evaluates to true; otherwise the condition evaluate to false.
If Exists is false, DynamoDB assumes that the
attribute value does not exist in the table. If in fact the value
does not exist, then the assumption is valid and the condition evaluates
to true. If the value is found, despite the assumption that it does not
exist, the condition evaluates to false.
Note that the default value for Exists is true.
The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator. Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
This parameter does not support attributes of type List or Map.
String conditionalOperator
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in the Expected map:
AND - If all of the conditions evaluate to true, then the
entire map evaluates to true.
OR - If at least one of the conditions evaluate to true,
then the entire map evaluates to true.
If you omit ConditionalOperator, then AND is the
default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.
String returnValues
Use ReturnValues if you want to get the item attributes as they appeared before they were deleted. For DeleteItem, the valid values are:
NONE - If ReturnValues is not specified, or if its
value is NONE, then nothing is returned. (This setting is
the default for ReturnValues.)
ALL_OLD - The content of the old item is returned.
String returnConsumedCapacity
String returnItemCollectionMetrics
Determines whether item collection metrics are returned. If set to
SIZE, the response includes statistics about item
collections, if any, that were modified during the operation are returned
in the response. If set to NONE (the default), no statistics
are returned.
String conditionExpression
A condition that must be satisfied in order for a conditional DeleteItem to succeed.
An expression can contain any of the following:
Functions:
attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
These function names are case-sensitive.
Comparison operators:
= | | | | = | = | BETWEEN | IN
Logical operators: AND | OR | NOT
For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> expressionAttributeValues
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
Map<K,V> attributes
A map of attribute names to AttributeValue objects, representing
the item as it appeared before the DeleteItem operation. This map
appears in the response only if ReturnValues was specified as
ALL_OLD in the request.
ConsumedCapacity consumedCapacity
ItemCollectionMetrics itemCollectionMetrics
Information about item collections, if any, that were affected by the operation. ItemCollectionMetrics is only returned if the request asked for it. If the table does not have any local secondary indexes, this information is not returned in the response.
Each ItemCollectionMetrics element consists of:
ItemCollectionKey - The partition key value of the item collection. This is the same as the partition key value of the item itself.
SizeEstimateRange - An estimate of item collection size, in gigabytes. This value is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on that table. Use this estimate to measure whether a local secondary index is approaching its size limit.
The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.
String tableName
The name of the table to delete.
TableDescription tableDescription
Long accountMaxReadCapacityUnits
The maximum total Read-Capacity Units (RCUs) that your account allows you to provision across all your tables in this region.
Long accountMaxWriteCapacityUnits
The maximum total Write-Capacity Units (WCUs) that your account allows you to provision across all your tables in this region.
Long tableMaxReadCapacityUnits
The maximum Read-Capacity Units (RCUs) that your account allows you to provision for a new table you are creating in this region, including the RCUs provisioned for its global secondary indexes (GSIs).
Long tableMaxWriteCapacityUnits
The maximum Write-Capacity Units (WCUs) that your account allows you to provision for a new table you are creating in this region, including the WCUs provisioned for its global secondary indexes (GSIs).
String streamArn
The Amazon Resource Name (ARN) for the stream.
Integer limit
The maximum number of shard objects to return. The upper limit is 100.
String exclusiveStartShardId
The shard ID of the first item that this operation will evaluate. Use the
value that was returned for LastEvaluatedShardId in the
previous operation.
StreamDescription streamDescription
A complete description of the stream, including its creation date and time, the DynamoDB table associated with the stream, the shard IDs within the stream, and the beginning and ending sequence numbers of stream records within the shards.
String tableName
The name of the table to describe.
TableDescription table
AttributeValue value
Boolean exists
Causes DynamoDB to evaluate the value before attempting a conditional operation:
If Exists is true, DynamoDB will check to see if that
attribute value already exists in the table. If it is found, then the
operation succeeds. If it is not found, the operation fails with a
ConditionalCheckFailedException.
If Exists is false, DynamoDB assumes that the
attribute value does not exist in the table. If in fact the value does
not exist, then the assumption is valid and the operation succeeds. If
the value is found, despite the assumption that it does not exist, the
operation fails with a ConditionalCheckFailedException.
The default setting for Exists is true. If you supply
a Value all by itself, DynamoDB assumes the attribute exists: You
don't have to set Exists to true, because it is
implied.
DynamoDB returns a ValidationException if:
Exists is true but there is no Value to check.
(You expect a value to exist, but don't specify what that value is.)
Exists is false but you also provide a Value.
(You cannot expect an attribute to have a value, while also expecting it
not to exist.)
String comparisonOperator
A comparator for evaluating attributes in the AttributeValueList. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
EQ : Equal. EQ is supported for all datatypes,
including lists and maps.
AttributeValueList can contain only one AttributeValue
element of type String, Number, Binary, String Set, Number Set, or Binary
Set. If an item contains an AttributeValue element of a different
type than the one provided in the request, the value does not match. For
example, {"S":"6"} does not equal {"N":"6"}.
Also, {"N":"6"} does not equal
{"NS":["6", "2", "1"]}.
NE : Not equal. NE is supported for all
datatypes, including lists and maps.
AttributeValueList can contain only one AttributeValue of
type String, Number, Binary, String Set, Number Set, or Binary Set. If an
item contains an AttributeValue of a different type than the one
provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
NOT_NULL : The attribute exists. NOT_NULL is
supported for all datatypes, including lists and maps.
This operator tests for the existence of an attribute, not its data type.
If the data type of attribute "a" is null, and you evaluate
it using NOT_NULL, the result is a Boolean true. This
result is because the attribute "a" exists; its data type is
not relevant to the NOT_NULL comparison operator.
NULL : The attribute does not exist. NULL is
supported for all datatypes, including lists and maps.
This operator tests for the nonexistence of an attribute, not its data
type. If the data type of attribute "a" is null, and you
evaluate it using NULL, the result is a Boolean
false. This is because the attribute "a" exists; its
data type is not relevant to the NULL comparison operator.
CONTAINS : Checks for a subsequence, or value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is of type String, then the operator checks
for a substring match. If the target attribute of the comparison is of
type Binary, then the operator looks for a subsequence of the target that
matches the input. If the target attribute of the comparison is a set ("
SS", "NS", or "BS"), then the
operator evaluates to true if it finds an exact match with any member of
the set.
CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "
b" cannot be a set, a map, or a list.
NOT_CONTAINS : Checks for absence of a subsequence, or
absence of a value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is a String, then the operator checks for the
absence of a substring match. If the target attribute of the comparison
is Binary, then the operator checks for the absence of a subsequence of
the target that matches the input. If the target attribute of the
comparison is a set ("SS", "NS", or "
BS"), then the operator evaluates to true if it does
not find an exact match with any member of the set.
NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a
" can be a list; however, "b" cannot be a set, a map, or a
list.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
IN : Checks for matching elements within two sets.
AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
List<E> attributeValueList
One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide.
String tableName
The name of the table containing the requested item.
Map<K,V> key
A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
List<E> attributesToGet
This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
Boolean consistentRead
Determines the read consistency model: If set to true, then
the operation uses strongly consistent reads; otherwise, the operation
uses eventually consistent reads.
String returnConsumedCapacity
String projectionExpression
A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
ProjectionExpression replaces the legacy AttributesToGet parameter.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> item
A map of attribute names to AttributeValue objects, as specified by AttributesToGet.
ConsumedCapacity consumedCapacity
List<E> records
The stream records from the shard, which were retrieved using the shard iterator.
String nextShardIterator
The next position in the shard from which to start sequentially reading
stream records. If set to null, the shard has been closed
and the requested iterator will not return any more data.
String streamArn
The Amazon Resource Name (ARN) for the stream.
String shardId
The identifier of the shard. The iterator will be returned for this shard ID.
String shardIteratorType
Determines how the shard iterator is used to start reading stream records from the shard:
AT_SEQUENCE_NUMBER - Start reading exactly from the position
denoted by a specific sequence number.
AFTER_SEQUENCE_NUMBER - Start reading right after the
position denoted by a specific sequence number.
TRIM_HORIZON - Start reading at the last (untrimmed) stream
record, which is the oldest record in the shard. In DynamoDB Streams,
there is a 24 hour limit on data retention. Stream records whose age
exceeds this limit are subject to removal (trimming) from the stream.
LATEST - Start reading just after the most recent stream
record in the shard, so that you always read the most recent data in the
shard.
String sequenceNumber
The sequence number of a stream record in the shard from which to start reading.
String shardIterator
The position in the shard from which to start reading stream records sequentially. A shard iterator specifies this position using the sequence number of a stream record in a shard.
String indexName
The name of the global secondary index. The name must be unique among all other indexes on this table.
List<E> keySchema
The complete key schema for a global secondary index, which consists of one or more pairs of attribute names and key types:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
Projection projection
ProvisionedThroughput provisionedThroughput
String indexName
The name of the global secondary index.
List<E> keySchema
The complete key schema for a global secondary index, which consists of one or more pairs of attribute names and key types:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
Projection projection
String indexStatus
The current state of the global secondary index:
CREATING - The index is being created.
UPDATING - The index is being updated.
DELETING - The index is being deleted.
ACTIVE - The index is ready for use.
Boolean backfilling
Indicates whether the index is currently backfilling. Backfilling is the process of reading items from the table and determining whether they can be added to the index. (Not all items will qualify: For example, a partition key cannot have any duplicate values.) If an item can be added to the index, DynamoDB will do so. After all items have been processed, the backfilling operation is complete and Backfilling is false.
For indexes that were created during a CreateTable operation, the Backfilling attribute does not appear in the DescribeTable output.
ProvisionedThroughputDescription provisionedThroughput
Long indexSizeBytes
The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
Long itemCount
The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
String indexArn
The Amazon Resource Name (ARN) that uniquely identifies the index.
UpdateGlobalSecondaryIndexAction update
The name of an existing global secondary index, along with new provisioned throughput settings to be applied to that index.
CreateGlobalSecondaryIndexAction create
The parameters required for creating a global secondary index on an existing table:
IndexName
KeySchema
AttributeDefinitions
Projection
ProvisionedThroughput
DeleteGlobalSecondaryIndexAction delete
The name of an existing global secondary index to be removed.
Map<K,V> itemCollectionKey
The partition key value of the item collection. This value is the same as the partition key value of the item.
List<E> sizeEstimateRangeGB
An estimate of item collection size, in gigabytes. This value is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on that table. Use this estimate to measure whether a local secondary index is approaching its size limit.
The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.
List<E> keys
The primary key attribute values that define the items and the attributes associated with the items.
List<E> attributesToGet
One or more attributes to retrieve from the table or index. If no attribute names are specified then all attributes will be returned. If any of the specified attributes are not found, they will not appear in the result.
Boolean consistentRead
The consistency of a read operation. If set to true, then a
strongly consistent read is used; otherwise, an eventually consistent
read is used.
String projectionExpression
A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the ProjectionExpression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
ProjectionExpression replaces the legacy AttributesToGet parameter.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
String attributeName
The name of a key attribute.
String keyType
The role that this key attribute will assume:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
String tableName
If this parameter is provided, then only the streams associated with this table name are returned.
Integer limit
The maximum number of streams to return. The upper limit is 100.
String exclusiveStartStreamArn
The ARN (Amazon Resource Name) of the first item that this operation will
evaluate. Use the value that was returned for
LastEvaluatedStreamArn in the previous operation.
List<E> streams
A list of stream descriptors associated with the current account and endpoint.
String lastEvaluatedStreamArn
The stream ARN of the item where the operation stopped, inclusive of the previous result set. Use this value to start a new operation, excluding this value in the new request.
If LastEvaluatedStreamArn is empty, then the "last page" of
results has been processed and there is no more data to be retrieved.
If LastEvaluatedStreamArn is not empty, it does not
necessarily mean that there is more data in the result set. The only way
to know when you have reached the end of the result set is when
LastEvaluatedStreamArn is empty.
String exclusiveStartTableName
The first table name that this operation will evaluate. Use the value that was returned for LastEvaluatedTableName in a previous operation, so that you can obtain the next page of results.
Integer limit
A maximum number of table names to return. If this parameter is not specified, the limit is 100.
List<E> tableNames
The names of the tables associated with the current account at the current endpoint. The maximum size of this array is 100.
If LastEvaluatedTableName also appears in the output, you can use this value as the ExclusiveStartTableName parameter in a subsequent ListTables request and obtain the next page of results.
String lastEvaluatedTableName
The name of the last table in the current page of results. Use this value as the ExclusiveStartTableName in a new request to obtain the next page of results, until all the table names are returned.
If you do not receive a LastEvaluatedTableName value in the response, this means that there are no more table names to be retrieved.
String indexName
The name of the local secondary index. The name must be unique among all other indexes on this table.
List<E> keySchema
The complete key schema for the local secondary index, consisting of one or more pairs of attribute names and key types:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
Projection projection
String indexName
Represents the name of the local secondary index.
List<E> keySchema
The complete key schema for the local secondary index, consisting of one or more pairs of attribute names and key types:
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
Projection projection
Long indexSizeBytes
The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
Long itemCount
The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
String indexArn
The Amazon Resource Name (ARN) that uniquely identifies the index.
String projectionType
The set of attributes that are projected into the index:
KEYS_ONLY - Only the index and primary keys are projected
into the index.
INCLUDE - Only the specified table attributes are projected
into the index. The list of projected attributes are in
NonKeyAttributes.
ALL - All of the table attributes are projected into the
index.
List<E> nonKeyAttributes
Represents the non-key attribute names which will be projected into the index.
For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
Long readCapacityUnits
The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException. For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide.
Long writeCapacityUnits
The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException. For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide.
Date lastIncreaseDateTime
The date and time of the last provisioned throughput increase for this table.
Date lastDecreaseDateTime
The date and time of the last provisioned throughput decrease for this table.
Long numberOfDecreasesToday
The number of provisioned throughput decreases for this table during this UTC calendar day. For current maximums on provisioned throughput decreases, see Limits in the Amazon DynamoDB Developer Guide.
Long readCapacityUnits
The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException. Eventually consistent reads require less effort than strongly consistent reads, so a setting of 50 ReadCapacityUnits per second provides 100 eventually consistent ReadCapacityUnits per second.
Long writeCapacityUnits
The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException.
String tableName
The name of the table to contain the item.
Map<K,V> item
A map of attribute name/value pairs, one for each attribute. Only the primary key attributes are required; you can optionally provide other attribute name-value pairs for the item.
You must provide all of the attributes for the primary key. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide both values for both the partition key and the sort key.
If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
For more information about primary keys, see Primary Key in the Amazon DynamoDB Developer Guide.
Each element in the Item map is an AttributeValue object.
Map<K,V> expected
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A map of attribute/condition pairs. Expected provides a conditional block for the PutItem operation.
This parameter does not support attributes of type List or Map.
Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
Expected contains the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList. When performing the comparison, DynamoDB uses strongly consistent reads.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
EQ : Equal. EQ is supported for all datatypes,
including lists and maps.
AttributeValueList can contain only one AttributeValue
element of type String, Number, Binary, String Set, Number Set, or Binary
Set. If an item contains an AttributeValue element of a different
type than the one provided in the request, the value does not match. For
example, {"S":"6"} does not equal {"N":"6"}.
Also, {"N":"6"} does not equal
{"NS":["6", "2", "1"]}.
NE : Not equal. NE is supported for all
datatypes, including lists and maps.
AttributeValueList can contain only one AttributeValue of
type String, Number, Binary, String Set, Number Set, or Binary Set. If an
item contains an AttributeValue of a different type than the one
provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
NOT_NULL : The attribute exists. NOT_NULL is
supported for all datatypes, including lists and maps.
This operator tests for the existence of an attribute, not its data type.
If the data type of attribute "a" is null, and you evaluate
it using NOT_NULL, the result is a Boolean true. This
result is because the attribute "a" exists; its data type is
not relevant to the NOT_NULL comparison operator.
NULL : The attribute does not exist. NULL is
supported for all datatypes, including lists and maps.
This operator tests for the nonexistence of an attribute, not its data
type. If the data type of attribute "a" is null, and you
evaluate it using NULL, the result is a Boolean
false. This is because the attribute "a" exists; its
data type is not relevant to the NULL comparison operator.
CONTAINS : Checks for a subsequence, or value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is of type String, then the operator checks
for a substring match. If the target attribute of the comparison is of
type Binary, then the operator looks for a subsequence of the target that
matches the input. If the target attribute of the comparison is a set ("
SS", "NS", or "BS"), then the
operator evaluates to true if it finds an exact match with any member of
the set.
CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "
b" cannot be a set, a map, or a list.
NOT_CONTAINS : Checks for absence of a subsequence, or
absence of a value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is a String, then the operator checks for the
absence of a substring match. If the target attribute of the comparison
is Binary, then the operator checks for the absence of a subsequence of
the target that matches the input. If the target attribute of the
comparison is a set ("SS", "NS", or "
BS"), then the operator evaluates to true if it does
not find an exact match with any member of the set.
NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a
" can be a list; however, "b" cannot be a set, a map, or a
list.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
IN : Checks for matching elements within two sets.
AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator:
Value - A value for DynamoDB to compare with an attribute.
Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
If Exists is true, DynamoDB will check to see if that
attribute value already exists in the table. If it is found, then the
condition evaluates to true; otherwise the condition evaluate to false.
If Exists is false, DynamoDB assumes that the
attribute value does not exist in the table. If in fact the value
does not exist, then the assumption is valid and the condition evaluates
to true. If the value is found, despite the assumption that it does not
exist, the condition evaluates to false.
Note that the default value for Exists is true.
The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator. Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
String returnValues
Use ReturnValues if you want to get the item attributes as they appeared before they were updated with the PutItem request. For PutItem, the valid values are:
NONE - If ReturnValues is not specified, or if its
value is NONE, then nothing is returned. (This setting is
the default for ReturnValues.)
ALL_OLD - If PutItem overwrote an attribute
name-value pair, then the content of the old item is returned.
String returnConsumedCapacity
String returnItemCollectionMetrics
Determines whether item collection metrics are returned. If set to
SIZE, the response includes statistics about item
collections, if any, that were modified during the operation are returned
in the response. If set to NONE (the default), no statistics
are returned.
String conditionalOperator
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in the Expected map:
AND - If all of the conditions evaluate to true, then the
entire map evaluates to true.
OR - If at least one of the conditions evaluate to true,
then the entire map evaluates to true.
If you omit ConditionalOperator, then AND is the
default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.
String conditionExpression
A condition that must be satisfied in order for a conditional PutItem operation to succeed.
An expression can contain any of the following:
Functions:
attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
These function names are case-sensitive.
Comparison operators:
= | | | | = | = | BETWEEN | IN
Logical operators: AND | OR | NOT
For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> expressionAttributeValues
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
Map<K,V> attributes
The attribute values as they appeared before the PutItem
operation, but only if ReturnValues is specified as
ALL_OLD in the request. Each element consists of an
attribute name and an attribute value.
ConsumedCapacity consumedCapacity
ItemCollectionMetrics itemCollectionMetrics
Information about item collections, if any, that were affected by the operation. ItemCollectionMetrics is only returned if the request asked for it. If the table does not have any local secondary indexes, this information is not returned in the response.
Each ItemCollectionMetrics element consists of:
ItemCollectionKey - The partition key value of the item collection. This is the same as the partition key value of the item itself.
SizeEstimateRange - An estimate of item collection size, in gigabytes. This value is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on that table. Use this estimate to measure whether a local secondary index is approaching its size limit.
The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.
Map<K,V> item
A map of attribute name to attribute values, representing the primary key of an item to be processed by PutItem. All of the table's primary key attributes must be specified, and their data types must match those of the table's key schema. If any attributes are present in the item which are part of an index key schema for the table, their types must match the index key schema.
String tableName
The name of the table containing the requested items.
String indexName
The name of an index to query. This index can be any local secondary index or global secondary index on the table. Note that if you use the IndexName parameter, you must also provide TableName.
String select
The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
ALL_ATTRIBUTES - Returns all of the item attributes from the
specified table or index. If you query a local secondary index, then for
each matching item in the index DynamoDB will fetch the entire item from
the parent table. If the index is configured to project all item
attributes, then all of the data can be obtained from the local secondary
index, and no fetching is required.
ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an
index. Retrieves all attributes that have been projected into the index.
If the index is configured to project all attributes, this return value
is equivalent to specifying ALL_ATTRIBUTES.
COUNT - Returns the number of matching items, rather than
the matching items themselves.
SPECIFIC_ATTRIBUTES - Returns only the attributes listed in
AttributesToGet. This return value is equivalent to specifying
AttributesToGet without specifying any value for Select.
If you query a local secondary index and request only attributes that are projected into that index, the operation will read only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB will fetch each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
If you query a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
If neither Select nor AttributesToGet are specified,
DynamoDB defaults to ALL_ATTRIBUTES when accessing a table,
and ALL_PROJECTED_ATTRIBUTES when accessing an index. You
cannot use both Select and AttributesToGet together in a
single request, unless the value for Select is
SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying
AttributesToGet without any value for Select.)
If you use the ProjectionExpression parameter, then the value for
Select can only be SPECIFIC_ATTRIBUTES. Any other
value for Select will return an error.
List<E> attributesToGet
This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
You cannot use both AttributesToGet and Select together in
a Query request, unless the value for Select is
SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying
AttributesToGet without any value for Select.)
If you query a local secondary index and request only attributes that are projected into that index, the operation will read only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB will fetch each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
If you query a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
Integer limit
The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed data set size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Query and Scan in the Amazon DynamoDB Developer Guide.
Boolean consistentRead
Determines the read consistency model: If set to true, then
the operation uses strongly consistent reads; otherwise, the operation
uses eventually consistent reads.
Strongly consistent reads are not supported on global secondary indexes.
If you query a global secondary index with ConsistentRead set to
true, you will receive a ValidationException.
Map<K,V> keyConditions
This is a legacy parameter, for backward compatibility. New applications should use KeyConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
The selection criteria for the query. For a query on a table, you can
have conditions only on the table primary key attributes. You must
provide the partition key name and value as an EQ condition.
You can optionally provide a second condition, referring to the sort key.
If you don't provide a sort key condition, all of the items that match the partition key will be retrieved. If a FilterExpression or QueryFilter is present, it will be applied after the items are retrieved.
For a query on an index, you can have conditions only on the index key
attributes. You must provide the index partition key name and value as an
EQ condition. You can optionally provide a second condition,
referring to the index sort key.
Each KeyConditions element consists of an attribute name to compare, along with the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
ComparisonOperator - A comparator for evaluating attributes, for example, equals, greater than, less than, and so on.
For KeyConditions, only the following comparison operators are supported:
EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN
The following are descriptions of these comparison operators.
EQ : Equal.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one specified
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
Map<K,V> queryFilter
This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A condition that evaluates the query results after the items are read and returns only the desired values.
This parameter does not support attributes of type List or Map.
A QueryFilter is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
If you provide more than one condition in the QueryFilter map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
Note that QueryFilter does not allow key attributes. You cannot define a filter condition on a partition key or a sort key.
Each QueryFilter element consists of an attribute name to compare, along with the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the operator specified in ComparisonOperator.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide.
ComparisonOperator - A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
For complete descriptions of all comparison operators, see the Condition data type.
String conditionalOperator
This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in a QueryFilter map:
AND - If all of the conditions evaluate to true, then the
entire map evaluates to true.
OR - If at least one of the conditions evaluate to true,
then the entire map evaluates to true.
If you omit ConditionalOperator, then AND is the
default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.
Boolean scanIndexForward
Specifies the order for index traversal: If true (default),
the traversal is performed in ascending order; if false, the
traversal is performed in descending order.
Items with the same partition key value are stored in sorted order by sort key. If the sort key data type is Number, the results are stored in numeric order. For type String, the results are stored in order of ASCII character code values. For type Binary, DynamoDB treats each byte of the binary data as unsigned.
If ScanIndexForward is true, DynamoDB returns the
results in the order in which they are stored (by sort key value). This
is the default behavior. If ScanIndexForward is false
, DynamoDB reads the results in reverse order by sort key value, and then
returns the results to the client.
Map<K,V> exclusiveStartKey
The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
String returnConsumedCapacity
String projectionExpression
A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
ProjectionExpression replaces the legacy AttributesToGet parameter.
String filterExpression
A string that contains conditions that DynamoDB applies after the Query operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
FilterExpression replaces the legacy QueryFilter and ConditionalOperator parameters.
String keyConditionExpression
The condition that specifies the key value(s) for items to be retrieved by the Query action.
The condition must perform an equality test on a single partition key value. The condition can also perform one of several comparison tests on a single sort key value. Query can use KeyConditionExpression to retrieve one item with a given partition key value and sort key value, or several items that have the same partition key value but different sort key values.
The partition key equality test is required, and must be specified in the following format:
partitionKeyName = :partitionkeyval
If you also want to provide a condition for the sort key, it must be combined using AND with the condition for the sort key. Following is an example, using the = comparison operator for the sort key:
partitionKeyName = :partitionkeyval
AND sortKeyName = :sortkeyval
Valid comparisons for the sort key condition are as follows:
sortKeyName = :sortkeyval - true if the
sort key value is equal to :sortkeyval.
sortKeyName
:sortkeyval - true if the sort key value is less than
:sortkeyval.
sortKeyName =
:sortkeyval - true if the sort key value is less than or
equal to :sortkeyval.
sortKeyName
:sortkeyval - true if the sort key value is greater than
:sortkeyval.
sortKeyName =
:sortkeyval - true if the sort key value is greater than or
equal to :sortkeyval.
sortKeyName BETWEEN :sortkeyval1
AND :sortkeyval2 - true if the sort key value is
greater than or equal to :sortkeyval1, and less than or
equal to :sortkeyval2.
begins_with (sortKeyName, :sortkeyval
) - true if the sort key value begins with a particular operand.
(You cannot use this function with a sort key that is of type Number.)
Note that the function name begins_with is case-sensitive.
Use the ExpressionAttributeValues parameter to replace tokens such
as :partitionval and :sortval with actual
values at runtime.
You can optionally use the ExpressionAttributeNames parameter to replace the names of the partition key and sort key with placeholder tokens. This option might be necessary if an attribute name conflicts with a DynamoDB reserved word. For example, the following KeyConditionExpression parameter causes an error because Size is a reserved word:
Size = :myval
To work around this, define a placeholder (such a #S) to
represent the attribute name Size. KeyConditionExpression
then is as follows:
#S = :myvalFor a list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide.
For more information on ExpressionAttributeNames and ExpressionAttributeValues, see Using Placeholders for Attribute Names and Values in the Amazon DynamoDB Developer Guide.
KeyConditionExpression replaces the legacy KeyConditions parameter.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> expressionAttributeValues
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
List<E> items
An array of item attributes that match the query criteria. Each element in this array consists of an attribute name and the value for that attribute.
Integer count
The number of items in the response.
If you used a QueryFilter in the request, then Count is the number of items returned after the filter was applied, and ScannedCount is the number of matching items before the filter was applied.
If you did not use a filter in the request, then Count and ScannedCount are the same.
Integer scannedCount
The number of items evaluated, before any QueryFilter is applied. A high ScannedCount value with few, or no, Count results indicates an inefficient Query operation. For more information, see Count and ScannedCount in the Amazon DynamoDB Developer Guide.
If you did not use a filter in the request, then ScannedCount is the same as Count.
Map<K,V> lastEvaluatedKey
The primary key of the item where the operation stopped, inclusive of the previous result set. Use this value to start a new operation, excluding this value in the new request.
If LastEvaluatedKey is empty, then the "last page" of results has been processed and there is no more data to be retrieved.
If LastEvaluatedKey is not empty, it does not necessarily mean that there is more data in the result set. The only way to know when you have reached the end of the result set is when LastEvaluatedKey is empty.
ConsumedCapacity consumedCapacity
String eventID
A globally unique identifier for the event that was recorded in this stream record.
String eventName
The type of data modification that was performed on the DynamoDB table:
INSERT - a new item was added to the table.
MODIFY - one or more of the item's attributes were updated.
REMOVE - the item was deleted from the table
String eventVersion
The version number of the stream record format. Currently, this is 1.0.
String eventSource
The AWS service from which the stream record originated. For DynamoDB Streams, this is aws:dynamodb.
String awsRegion
The region in which the GetRecords request was received.
StreamRecord dynamodb
The main body of the stream record, containing all of the DynamoDB-specific fields.
String tableName
The name of the table containing the requested items; or, if you provide
IndexName, the name of the table to which that index
belongs.
String indexName
The name of a secondary index to scan. This index can be any local
secondary index or global secondary index. Note that if you use the
IndexName parameter, you must also provide
TableName.
List<E> attributesToGet
This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
Integer limit
The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed data set size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Query and Scan in the Amazon DynamoDB Developer Guide.
String select
The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, or the count of matching items.
ALL_ATTRIBUTES - Returns all of the item attributes.
COUNT - Returns the number of matching items, rather than
the matching items themselves.
SPECIFIC_ATTRIBUTES - Returns only the attributes listed in
AttributesToGet. This return value is equivalent to specifying
AttributesToGet without specifying any value for Select.
If neither Select nor AttributesToGet are specified,
DynamoDB defaults to ALL_ATTRIBUTES. You cannot use both
AttributesToGet and Select together in a single request,
unless the value for Select is SPECIFIC_ATTRIBUTES.
(This usage is equivalent to specifying AttributesToGet without
any value for Select.)
Map<K,V> scanFilter
This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A condition that evaluates the scan results and returns only the desired values.
This parameter does not support attributes of type List or Map.
If you specify more than one condition in the ScanFilter map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
Each ScanFilter element consists of an attribute name to compare, along with the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the operator specified in ComparisonOperator .
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide.
ComparisonOperator - A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
For complete descriptions of all comparison operators, see Condition.
String conditionalOperator
This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in a ScanFilter map:
AND - If all of the conditions evaluate to true, then the
entire map evaluates to true.
OR - If at least one of the conditions evaluate to true,
then the entire map evaluates to true.
If you omit ConditionalOperator, then AND is the
default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.
Map<K,V> exclusiveStartKey
The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
In a parallel scan, a Scan request that includes ExclusiveStartKey must specify the same segment whose previous Scan returned the corresponding value of LastEvaluatedKey.
String returnConsumedCapacity
Integer totalSegments
For a parallel Scan request, TotalSegments represents the total number of segments into which the Scan operation will be divided. The value of TotalSegments corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments value of 4.
The value for TotalSegments must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments value of 1, the Scan operation will be sequential rather than parallel.
If you specify TotalSegments, you must also specify Segment.
Integer segment
For a parallel Scan request, Segment identifies an individual segment to be scanned by an application worker.
Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment value of 0, the second thread specifies 1, and so on.
The value of LastEvaluatedKey returned from a parallel Scan request must be used as ExclusiveStartKey with the same segment ID in a subsequent Scan operation.
The value for Segment must be greater than or equal to 0, and less than the value provided for TotalSegments.
If you provide Segment, you must also provide TotalSegments.
String projectionExpression
A string that identifies one or more attributes to retrieve from the specified table or index. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
ProjectionExpression replaces the legacy AttributesToGet parameter.
String filterExpression
A string that contains conditions that DynamoDB applies after the Scan operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
FilterExpression replaces the legacy ScanFilter and ConditionalOperator parameters.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> expressionAttributeValues
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
Boolean consistentRead
A Boolean value that determines the read consistency model during the scan:
If ConsistentRead is false, then the data returned
from Scan might not contain the results from other recently
completed write operations (PutItem, UpdateItem or DeleteItem).
If ConsistentRead is true, then all of the write
operations that completed before the Scan began are guaranteed to
be contained in the Scan response.
The default setting for ConsistentRead is false.
The ConsistentRead parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead set to true, you will receive a ValidationException.
List<E> items
An array of item attributes that match the scan criteria. Each element in this array consists of an attribute name and the value for that attribute.
Integer count
The number of items in the response.
If you set ScanFilter in the request, then Count is the number of items returned after the filter was applied, and ScannedCount is the number of matching items before the filter was applied.
If you did not use a filter in the request, then Count is the same as ScannedCount.
Integer scannedCount
The number of items evaluated, before any ScanFilter is applied. A high ScannedCount value with few, or no, Count results indicates an inefficient Scan operation. For more information, see Count and ScannedCount in the Amazon DynamoDB Developer Guide.
If you did not use a filter in the request, then ScannedCount is the same as Count.
Map<K,V> lastEvaluatedKey
The primary key of the item where the operation stopped, inclusive of the previous result set. Use this value to start a new operation, excluding this value in the new request.
If LastEvaluatedKey is empty, then the "last page" of results has been processed and there is no more data to be retrieved.
If LastEvaluatedKey is not empty, it does not necessarily mean that there is more data in the result set. The only way to know when you have reached the end of the result set is when LastEvaluatedKey is empty.
ConsumedCapacity consumedCapacity
String shardId
The system-generated identifier for this shard.
SequenceNumberRange sequenceNumberRange
The range of possible sequence numbers for the shard.
String parentShardId
The shard ID of the current shard's parent.
String streamArn
The Amazon Resource Name (ARN) for the stream.
String tableName
The DynamoDB table with which the stream is associated.
String streamLabel
A timestamp, in ISO 8601 format, for this stream.
Note that LatestStreamLabel is not a unique identifier for the stream, because it is possible that a stream from another table might have the same timestamp. However, the combination of the following three elements is guaranteed to be unique:
the AWS customer ID.
the table name
the StreamLabel
String streamArn
The Amazon Resource Name (ARN) for the stream.
String streamLabel
A timestamp, in ISO 8601 format, for this stream.
Note that LatestStreamLabel is not a unique identifier for the stream, because it is possible that a stream from another table might have the same timestamp. However, the combination of the following three elements is guaranteed to be unique:
the AWS customer ID.
the table name
the StreamLabel
String streamStatus
Indicates the current status of the stream:
ENABLING - Streams is currently being enabled on the
DynamoDB table.
ENABLING - the stream is enabled.
DISABLING - Streams is currently being disabled on the
DynamoDB table.
DISABLED - the stream is disabled.
String streamViewType
Indicates the format of the records within this stream:
KEYS_ONLY - only the key attributes of items that were
modified in the DynamoDB table.
NEW_IMAGE - entire item from the table, as it appeared after
they were modified.
OLD_IMAGE - entire item from the table, as it appeared
before they were modified.
NEW_AND_OLD_IMAGES - both the new and the old images of the
items from the table.
Date creationRequestDateTime
The date and time when the request to create this stream was issued.
String tableName
The DynamoDB table with which the stream is associated.
List<E> keySchema
The key attribute(s) of the stream's DynamoDB table.
List<E> shards
The shards that comprise the stream.
String lastEvaluatedShardId
The shard ID of the item where the operation stopped, inclusive of the previous result set. Use this value to start a new operation, excluding this value in the new request.
If LastEvaluatedShardId is empty, then the "last page" of
results has been processed and there is currently no more data to be
retrieved.
If LastEvaluatedShardId is not empty, it does not
necessarily mean that there is more data in the result set. The only way
to know when you have reached the end of the result set is when
LastEvaluatedShardId is empty.
Map<K,V> keys
The primary key attribute(s) for the DynamoDB item that was modified.
Map<K,V> newImage
The item in the DynamoDB table as it appeared after it was modified.
Map<K,V> oldImage
The item in the DynamoDB table as it appeared before it was modified.
String sequenceNumber
The sequence number of the stream record.
Long sizeBytes
The size of the stream record, in bytes.
String streamViewType
The type of data from the modified DynamoDB item that was captured in this stream record:
KEYS_ONLY - only the key attributes of the modified item.
NEW_IMAGE - the entire item, as it appears after it was
modified.
OLD_IMAGE - the entire item, as it appeared before it was
modified.
NEW_AND_OLD_IMAGES — both the new and the old item images of
the item.
Boolean streamEnabled
Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
String streamViewType
The DynamoDB Streams settings for the table. These settings consist of:
StreamEnabled - Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the stream for this table. Valid values for StreamViewType are:
KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
List<E> attributeDefinitions
An array of AttributeDefinition objects. Each of these objects describes one attribute in the table and index key schema.
Each AttributeDefinition object in this array is composed of:
AttributeName - The name of the attribute.
AttributeType - The data type for the attribute.
String tableName
The name of the table.
List<E> keySchema
The primary key structure for the table. Each KeySchemaElement consists of:
AttributeName - The name of the attribute.
KeyType - The role of the attribute:
.
HASH - partition key
RANGE - sort key
The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its range attribute. The term "range attribute" derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
For more information about primary keys, see Primary Key in the Amazon DynamoDB Developer Guide.
String tableStatus
The current state of the table:
CREATING - The table is being created.
UPDATING - The table is being updated.
DELETING - The table is being deleted.
ACTIVE - The table is ready for use.
Date creationDateTime
The date and time when the table was created, in UNIX epoch time format.
ProvisionedThroughputDescription provisionedThroughput
The provisioned throughput settings for the table, consisting of read and write capacity units, along with data about increases and decreases.
Long tableSizeBytes
The total size of the specified table, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
Long itemCount
The number of items in the specified table. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
String tableArn
The Amazon Resource Name (ARN) that uniquely identifies the table.
List<E> localSecondaryIndexes
Represents one or more local secondary indexes on the table. Each index is scoped to a given partition key value. Tables with one or more local secondary indexes are subject to an item collection size limit, where the amount of data within a given item collection cannot exceed 10 GB. Each element is composed of:
IndexName - The name of the local secondary index.
KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
ProjectionType - One of the following:
KEYS_ONLY - Only the index and primary keys are projected
into the index.
INCLUDE - Only the specified table attributes are projected
into the index. The list of projected attributes are in
NonKeyAttributes.
ALL - All of the table attributes are projected into the
index.
NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
IndexSizeBytes - Represents the total size of the index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
ItemCount - Represents the number of items in the index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
If the table is in the DELETING state, no information about
indexes will be returned.
List<E> globalSecondaryIndexes
The global secondary indexes, if any, on the table. Each index is scoped to a given partition key value. Each element is composed of:
Backfilling - If true, then the index is currently in the backfilling phase. Backfilling occurs only when a new global secondary index is added to the table; it is the process by which DynamoDB populates the new index with data from the table. (This attribute does not appear for indexes that were created during a CreateTable operation.)
IndexName - The name of the global secondary index.
IndexSizeBytes - The total size of the global secondary index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
IndexStatus - The current status of the global secondary index:
CREATING - The index is being created.
UPDATING - The index is being updated.
DELETING - The index is being deleted.
ACTIVE - The index is ready for use.
ItemCount - The number of items in the global secondary index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
ProjectionType - One of the following:
KEYS_ONLY - Only the index and primary keys are projected
into the index.
INCLUDE - Only the specified table attributes are projected
into the index. The list of projected attributes are in
NonKeyAttributes.
ALL - All of the table attributes are projected into the
index.
NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
ProvisionedThroughput - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units, along with data about increases and decreases.
If the table is in the DELETING state, no information about
indexes will be returned.
StreamSpecification streamSpecification
The current DynamoDB Streams configuration for the table.
String latestStreamLabel
A timestamp, in ISO 8601 format, for this stream.
Note that LatestStreamLabel is not a unique identifier for the stream, because it is possible that a stream from another table might have the same timestamp. However, the combination of the following three elements is guaranteed to be unique:
the AWS customer ID.
the table name.
the StreamLabel.
String latestStreamArn
The Amazon Resource Name (ARN) that uniquely identifies the latest stream for this table.
String indexName
The name of the global secondary index to be updated.
ProvisionedThroughput provisionedThroughput
String tableName
The name of the table containing the item to update.
Map<K,V> key
The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
Map<K,V> attributeUpdates
This is a legacy parameter, for backward compatibility. New applications should use UpdateExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
This parameter can be used for modifying top-level attributes; however, it does not support individual list or map elements.
The names of attributes to be modified, the action to perform on each, and the new value for each. If you are updating an attribute that is an index key attribute for any indexes on that table, the attribute type must match the index key type defined in the AttributesDefinition of the table description. You can use UpdateItem to update any non-key attributes.
Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException exception.
Each AttributeUpdates element consists of an attribute name to modify, along with the following:
Value - The new value, if applicable, for this attribute.
Action - A value that specifies how to perform the update. This
action is only valid for an existing attribute whose data type is Number
or is a set; do not use ADD for other data types.
If an item with the specified primary key is found in the table, the following values perform the following actions:
PUT - Adds the specified attribute to the item. If the
attribute already exists, it is replaced by the new value.
DELETE - Removes the attribute and its value, if no value is
specified for DELETE. The data type of the specified value
must match the existing value's data type.
If a set of values is specified, then those values are subtracted from
the old set. For example, if the attribute value was the set
[a,b,c] and the DELETE action specifies
[a,c], then the final attribute value is [b].
Specifying an empty set is an error.
ADD - Adds the specified value to the item, if the attribute
does not already exist. If the attribute does exist, then the behavior of
ADD depends on the data type of the attribute:
If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
If you use ADD to increment or decrement a number value for
an item that doesn't exist before the update, DynamoDB uses 0 as the
initial value.
Similarly, if you use ADD for an existing item to increment
or decrement an attribute value that doesn't exist before the update,
DynamoDB uses 0 as the initial value. For example, suppose
that the item you want to update doesn't have an attribute named
itemcount, but you decide to ADD the number
3 to this attribute anyway. DynamoDB will create the
itemcount attribute, set its initial value to 0, and
finally add 3 to it. The result will be a new
itemcount attribute, with a value of 3.
If the existing data type is a set, and if Value is also a set,
then Value is appended to the existing set. For example, if the
attribute value is the set [1,2], and the ADD
action specified [3], then the final attribute value is
[1,2,3]. An error occurs if an ADD action is
specified for a set attribute and the attribute type specified does not
match the existing set type.
Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, Value must also be a set of strings.
If no item with the specified key is found in the table, the following values perform the following actions:
PUT - Causes DynamoDB to create a new item with the
specified primary key, and then adds the attribute.
DELETE - Nothing happens, because attributes cannot be
deleted from a nonexistent item. The operation succeeds, but DynamoDB
does not create a new item.
ADD - Causes DynamoDB to create an item with the supplied
primary key and number (or set of numbers) for the attribute value. The
only data types allowed are Number and Number Set.
If you provide any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
Map<K,V> expected
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A map of attribute/condition pairs. Expected provides a conditional block for the UpdateItem operation.
Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
Expected contains the following:
AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based
on ASCII character code values. For example, a is greater
than A, and a is greater than B.
For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters.
For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList. When performing the comparison, DynamoDB uses strongly consistent reads.
The following comparison operators are available:
EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
The following are descriptions of each comparison operator.
EQ : Equal. EQ is supported for all datatypes,
including lists and maps.
AttributeValueList can contain only one AttributeValue
element of type String, Number, Binary, String Set, Number Set, or Binary
Set. If an item contains an AttributeValue element of a different
type than the one provided in the request, the value does not match. For
example, {"S":"6"} does not equal {"N":"6"}.
Also, {"N":"6"} does not equal
{"NS":["6", "2", "1"]}.
NE : Not equal. NE is supported for all
datatypes, including lists and maps.
AttributeValueList can contain only one AttributeValue of
type String, Number, Binary, String Set, Number Set, or Binary Set. If an
item contains an AttributeValue of a different type than the one
provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not equal {"NS":["6", "2", "1"]}
.
LE : Less than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
LT : Less than.
AttributeValueList can contain only one AttributeValue of
type String, Number, or Binary (not a set type). If an item contains an
AttributeValue element of a different type than the one provided
in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GE : Greater than or equal.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
GT : Greater than.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If an item
contains an AttributeValue element of a different type than the
one provided in the request, the value does not match. For example,
{"S":"6"} does not equal {"N":"6"}. Also,
{"N":"6"} does not compare to
{"NS":["6", "2", "1"]}.
NOT_NULL : The attribute exists. NOT_NULL is
supported for all datatypes, including lists and maps.
This operator tests for the existence of an attribute, not its data type.
If the data type of attribute "a" is null, and you evaluate
it using NOT_NULL, the result is a Boolean true. This
result is because the attribute "a" exists; its data type is
not relevant to the NOT_NULL comparison operator.
NULL : The attribute does not exist. NULL is
supported for all datatypes, including lists and maps.
This operator tests for the nonexistence of an attribute, not its data
type. If the data type of attribute "a" is null, and you
evaluate it using NULL, the result is a Boolean
false. This is because the attribute "a" exists; its
data type is not relevant to the NULL comparison operator.
CONTAINS : Checks for a subsequence, or value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is of type String, then the operator checks
for a substring match. If the target attribute of the comparison is of
type Binary, then the operator looks for a subsequence of the target that
matches the input. If the target attribute of the comparison is a set ("
SS", "NS", or "BS"), then the
operator evaluates to true if it finds an exact match with any member of
the set.
CONTAINS is supported for lists: When evaluating "
a CONTAINS b", "a" can be a list; however, "
b" cannot be a set, a map, or a list.
NOT_CONTAINS : Checks for absence of a subsequence, or
absence of a value in a set.
AttributeValueList can contain only one AttributeValue
element of type String, Number, or Binary (not a set type). If the target
attribute of the comparison is a String, then the operator checks for the
absence of a substring match. If the target attribute of the comparison
is Binary, then the operator checks for the absence of a subsequence of
the target that matches the input. If the target attribute of the
comparison is a set ("SS", "NS", or "
BS"), then the operator evaluates to true if it does
not find an exact match with any member of the set.
NOT_CONTAINS is supported for lists: When evaluating "
a NOT CONTAINS b", "a
" can be a list; however, "b" cannot be a set, a map, or a
list.
BEGINS_WITH : Checks for a prefix.
AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
IN : Checks for matching elements within two sets.
AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
BETWEEN : Greater than or equal to the first value, and less
than or equal to the second value.
AttributeValueList must contain two AttributeValue elements
of the same type, either String, Number, or Binary (not a set type). A
target attribute matches if the target value is greater than, or equal
to, the first element and less than, or equal to, the second element. If
an item contains an AttributeValue element of a different type
than the one provided in the request, the value does not match. For
example, {"S":"6"} does not compare to
{"N":"6"}. Also, {"N":"6"} does not compare to
{"NS":["6", "2", "1"]}
For usage examples of AttributeValueList and ComparisonOperator, see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide.
For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator:
Value - A value for DynamoDB to compare with an attribute.
Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
If Exists is true, DynamoDB will check to see if that
attribute value already exists in the table. If it is found, then the
condition evaluates to true; otherwise the condition evaluate to false.
If Exists is false, DynamoDB assumes that the
attribute value does not exist in the table. If in fact the value
does not exist, then the assumption is valid and the condition evaluates
to true. If the value is found, despite the assumption that it does not
exist, the condition evaluates to false.
Note that the default value for Exists is true.
The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator. Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
This parameter does not support attributes of type List or Map.
String conditionalOperator
This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
A logical operator to apply to the conditions in the Expected map:
AND - If all of the conditions evaluate to true, then the
entire map evaluates to true.
OR - If at least one of the conditions evaluate to true,
then the entire map evaluates to true.
If you omit ConditionalOperator, then AND is the
default.
The operation will succeed only if the entire map evaluates to true.
This parameter does not support attributes of type List or Map.
String returnValues
Use ReturnValues if you want to get the item attributes as they appeared either before or after they were updated. For UpdateItem, the valid values are:
NONE - If ReturnValues is not specified, or if its
value is NONE, then nothing is returned. (This setting is
the default for ReturnValues.)
ALL_OLD - If UpdateItem overwrote an attribute
name-value pair, then the content of the old item is returned.
UPDATED_OLD - The old versions of only the updated
attributes are returned.
ALL_NEW - All of the attributes of the new version of the
item are returned.
UPDATED_NEW - The new versions of only the updated
attributes are returned.
There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No Read Capacity Units are consumed.
Values returned are strongly consistent
String returnConsumedCapacity
String returnItemCollectionMetrics
Determines whether item collection metrics are returned. If set to
SIZE, the response includes statistics about item
collections, if any, that were modified during the operation are returned
in the response. If set to NONE (the default), no statistics
are returned.
String updateExpression
An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
The following action values are available for UpdateExpression.
SET - Adds one or more attributes and values to an item. If
any of these attribute already exist, they are replaced by the new
values. You can also use SET to add or subtract from an
attribute that is of type Number. For example:
SET myNum = myNum + :val
SET supports the following functions:
if_not_exists (path, operand) - if the item does not contain
an attribute at the specified path, then if_not_exists
evaluates to operand; otherwise, it evaluates to path. You can use this
function to avoid overwriting an attribute that may already be present in
the item.
list_append (operand, operand) - evaluates to a list with a
new element added to it. You can append the new element to the start or
the end of the list by reversing the order of the operands.
These function names are case-sensitive.
REMOVE - Removes one or more attributes from an item.
ADD - Adds the specified value to the item, if the attribute
does not already exist. If the attribute does exist, then the behavior of
ADD depends on the data type of the attribute:
If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
If you use ADD to increment or decrement a number value for
an item that doesn't exist before the update, DynamoDB uses
0 as the initial value.
Similarly, if you use ADD for an existing item to increment
or decrement an attribute value that doesn't exist before the update,
DynamoDB uses 0 as the initial value. For example, suppose
that the item you want to update doesn't have an attribute named
itemcount, but you decide to ADD the number
3 to this attribute anyway. DynamoDB will create the
itemcount attribute, set its initial value to 0, and
finally add 3 to it. The result will be a new
itemcount attribute in the item, with a value of 3.
If the existing data type is a set and if Value is also a set,
then Value is added to the existing set. For example, if the
attribute value is the set [1,2], and the ADD
action specified [3], then the final attribute value is
[1,2,3]. An error occurs if an ADD action is
specified for a set attribute and the attribute type specified does not
match the existing set type.
Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
The ADD action only supports Number and set data types. In
addition, ADD can only be used on top-level attributes, not
nested attributes.
DELETE - Deletes an element from a set.
If a set of values is specified, then those values are subtracted from
the old set. For example, if the attribute value was the set
[a,b,c] and the DELETE action specifies
[a,c], then the final attribute value is [b].
Specifying an empty set is an error.
The DELETE action only supports set data types. In addition,
DELETE can only be used on top-level attributes, not nested
attributes.
You can have many actions in a single expression, such as the following:
SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
UpdateExpression replaces the legacy AttributeUpdates parameter.
String conditionExpression
A condition that must be satisfied in order for a conditional update to succeed.
An expression can contain any of the following:
Functions:
attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
These function names are case-sensitive.
Comparison operators:
= | | | | = | = | BETWEEN | IN
Logical operators: AND | OR | NOT
For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
Map<K,V> expressionAttributeNames
One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
To access an attribute whose name conflicts with a DynamoDB reserved word.
To create a placeholder for repeating occurrences of an attribute name in an expression.
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
Percentile
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
{"#P":"Percentile"}
You could then use this substitution in an expression, as in this example:
#P = :val
Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
Map<K,V> expressionAttributeValues
One or more values that can be substituted in an expression.
Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
Available | Backordered | Discontinued
You would first need to specify ExpressionAttributeValues as follows:
{ ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
You could then use these values in an expression, such as this:
ProductStatus IN (:avail, :back, :disc)
For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
Map<K,V> attributes
A map of attribute values as they appeared before the UpdateItem
operation. This map only appears if ReturnValues was specified as
something other than NONE in the request. Each element
represents one attribute.
ConsumedCapacity consumedCapacity
ItemCollectionMetrics itemCollectionMetrics
List<E> attributeDefinitions
An array of attributes that describe the key schema for the table and indexes. If you are adding a new global secondary index to the table, AttributeDefinitions must include the key element(s) of the new index.
String tableName
The name of the table to be updated.
ProvisionedThroughput provisionedThroughput
List<E> globalSecondaryIndexUpdates
An array of one or more global secondary indexes for the table. For each index in the array, you can request one action:
Create - add a new global secondary index to the table.
Update - modify the provisioned throughput settings of an existing global secondary index.
Delete - remove a global secondary index from the table.
For more information, see Managing Global Secondary Indexes in the Amazon DynamoDB Developer Guide.
StreamSpecification streamSpecification
Represents the DynamoDB Streams configuration for the table.
You will receive a ResourceInUseException if you attempt to enable a stream on a table that already has a stream, or if you attempt to disable a stream on a table which does not have a stream.
TableDescription tableDescription
PutRequest putRequest
A request to perform a PutItem operation.
DeleteRequest deleteRequest
A request to perform a DeleteItem operation.
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