DynamoDbEnhancedClient (AWS Java SDK :: DynamoDB

All Superinterfaces:

DynamoDbEnhancedResource

All Known Implementing Classes:

DefaultDynamoDbEnhancedClient
```
public interface DynamoDbEnhancedClient
extends DynamoDbEnhancedResource
```
Synchronous interface for running commands against a DynamoDb database.
By default, all command methods throw an UnsupportedOperationException to prevent interface extensions from breaking implementing classes.

Nested Class Summary

Nested Classes
Modifier and Type Interface and Description

static interface DynamoDbEnhancedClient.Builder
The builder definition for a DynamoDbEnhancedClient.

Nested Classes
Modifier and Type	Interface and Description
`static interface`	`DynamoDbEnhancedClient.Builder` The builder definition for a `DynamoDbEnhancedClient`.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default BatchGetResultPageIterable`	`batchGetItem(BatchGetItemEnhancedRequest request)` Retrieves items from one or more tables by their primary keys, see `Key`.
`default BatchGetResultPageIterable`	`batchGetItem(Consumer<BatchGetItemEnhancedRequest.Builder> requestConsumer)` Retrieves items from one or more tables by their primary keys, see `Key`.
`default BatchWriteResult`	`batchWriteItem(BatchWriteItemEnhancedRequest request)` Puts and/or deletes multiple items in one or more tables.
`default BatchWriteResult`	`batchWriteItem(Consumer<BatchWriteItemEnhancedRequest.Builder> requestConsumer)` Puts and/or deletes multiple items in one or more tables.
`static DynamoDbEnhancedClient.Builder`	`builder()` Creates a default builder for `DynamoDbEnhancedClient`.
`static DynamoDbEnhancedClient`	`create()` Creates a `DynamoDbEnhancedClient` with a default `DynamoDbClient`
`<T> DynamoDbTable<T>`	`table(String tableName, TableSchema<T> tableSchema)` Returns a mapped table that can be used to execute commands that work with mapped items against that table.
`default List<Document>`	`transactGetItems(Consumer<TransactGetItemsEnhancedRequest.Builder> requestConsumer)` Retrieves multiple items from one or more tables in a single atomic transaction.
`default List<Document>`	`transactGetItems(TransactGetItemsEnhancedRequest request)` Retrieves multiple items from one or more tables in a single atomic transaction.
`default Void`	`transactWriteItems(Consumer<TransactWriteItemsEnhancedRequest.Builder> requestConsumer)` Writes and/or modifies multiple items from one or more tables in a single atomic transaction.
`default Void`	`transactWriteItems(TransactWriteItemsEnhancedRequest request)` Writes and/or modifies multiple items from one or more tables in a single atomic transaction.

- Method Detail
  - table
```
<T> DynamoDbTable<T> table(String tableName,
                           TableSchema<T> tableSchema)
```
    Returns a mapped table that can be used to execute commands that work with mapped items against that table.
    
    Type Parameters:
    
    T - The modelled object type being mapped to this table.
    
    Parameters:
    
    tableName - The name of the physical table persisted by DynamoDb.
    
    tableSchema - A TableSchema that maps the table to a modelled object.
    
    Returns:
    
    A DynamoDbTable object that can be used to execute table operations against.
  - batchGetItem
```
default BatchGetResultPageIterable batchGetItem(BatchGetItemEnhancedRequest request)
```
    Retrieves items from one or more tables by their primary keys, see Key. BatchGetItem is a composite operation where the request contains one batch of GetItemEnhancedRequest per targeted table. The operation makes several calls to the database; each time you iterate over the result to retrieve a page, a call is made for the items on that page.
    The additional configuration parameters that the enhanced client supports are defined in the BatchGetItemEnhancedRequest.
    Partial results. A single call to DynamoDb has restraints on how much data can be retrieved. If those limits are exceeded, the call yields a partial result. This may also be the case if provisional throughput is exceeded or there is an internal DynamoDb processing failure. The operation automatically retries any unprocessed keys returned from DynamoDb in subsequent calls for pages.
    This operation calls the low-level DynamoDbClient.batchGetItemPaginator(software.amazon.awssdk.services.dynamodb.model.BatchGetItemRequest) operation. Consult the BatchGetItem documentation for further details and constraints as well as current limits of data retrieval.
    Example:
```
 

 BatchGetResultPageIterable batchResults = enhancedClient.batchGetItem(
            BatchGetItemEnhancedRequest.builder()
                                       .readBatches(ReadBatch.builder(FirstItem.class)
                                                             .mappedTableResource(firstItemTable)
                                                             .addGetItem(GetItemEnhancedRequest.builder().key(key1).build())
                                                             .addGetItem(GetItemEnhancedRequest.builder().key(key2).build())
                                                             .build(),
                                                    ReadBatch.builder(SecondItem.class)
                                                             .mappedTableResource(secondItemTable)
                                                             .addGetItem(GetItemEnhancedRequest.builder().key(key3).build())
                                                             .build())
                                       .build());
 
 
```
    The result can be accessed either through iterable BatchGetResultPages or flattened results belonging to the supplied table across all pages.
    1) Iterating through pages
```
 
 batchResults.forEach(page -> {
     page.resultsForTable(firstItemTable).forEach(item -> System.out.println(item));
     page.resultsForTable(secondItemTable).forEach(item -> System.out.println(item));
 });
 
 
```
    2) Iterating through results across all pages
```
 
 results.resultsForTable(firstItemTable).forEach(item -> System.out.println(item));
 results.resultsForTable(secondItemTable).forEach(item -> System.out.println(item));
 
 
```
    Parameters:
    
    request - A BatchGetItemEnhancedRequest containing keys grouped by tables.
    
    Returns:
    
    an iterator of type SdkIterable with paginated results of type BatchGetResultPage.
    
    See Also:
    
    batchGetItem(Consumer), DynamoDbClient.batchGetItemPaginator(software.amazon.awssdk.services.dynamodb.model.BatchGetItemRequest)
  - batchGetItem
```
default BatchGetResultPageIterable batchGetItem(Consumer<BatchGetItemEnhancedRequest.Builder> requestConsumer)
```
    Retrieves items from one or more tables by their primary keys, see Key. BatchGetItem is a composite operation where the request contains one batch of GetItemEnhancedRequest per targeted table. The operation makes several calls to the database; each time you iterate over the result to retrieve a page, a call is made for the items on that page.
    Note: This is a convenience method that creates an instance of the request builder avoiding the need to create one manually via BatchGetItemEnhancedRequest.builder().
    Example:
```
 

 BatchGetResultPageIterable batchResults = enhancedClient.batchGetItem(r -> r.addReadBatches(
     ReadBatch.builder(FirstItem.class)
              .mappedTableResource(firstItemTable)
              .addGetItem(i -> i.key(key1))
              .addGetItem(i -> i.key(key2))
              .build(),
     ReadBatch.builder(SecondItem.class)
              .mappedTableResource(secondItemTable)
              .addGetItem(i -> i.key(key3))
              .build()));
 
 
```
    Parameters:
    
    requestConsumer - a Consumer of BatchGetItemEnhancedRequest.Builder containing keys grouped by tables.
    
    Returns:
    
    an iterator of type SdkIterable with paginated results of type BatchGetResultPage.
    
    See Also:
    
    batchGetItem(BatchGetItemEnhancedRequest), DynamoDbClient.batchGetItemPaginator(BatchGetItemRequest)
  - batchWriteItem
```
default BatchWriteResult batchWriteItem(BatchWriteItemEnhancedRequest request)
```
    Puts and/or deletes multiple items in one or more tables. BatchWriteItem is a composite operation where the request contains one batch of (a mix of) PutItemEnhancedRequest and DeleteItemEnhancedRequest per targeted table.
    The additional configuration parameters that the enhanced client supports are defined in the BatchWriteItemEnhancedRequest.
    Note: BatchWriteItem cannot update items. Instead, use the individual updateItem operation DynamoDbTable.updateItem(UpdateItemEnhancedRequest).
    Partial updates
    Each delete or put call is atomic, but the operation as a whole is not. If individual operations fail due to exceeded provisional throughput internal DynamoDb processing failures, the failed requests can be retrieved through the result, see BatchWriteResult.
    There are some conditions that cause the whole batch operation to fail. These include non-existing tables, erroneously defined primary key attributes, attempting to put and delete the same item as well as referring more than once to the same hash and range (sort) key.
    This operation calls the low-level DynamoDB API BatchWriteItem operation. Consult the BatchWriteItem documentation for further details and constraints, current limits of data to write and/or delete, how to handle partial updates and retries and under which conditions the operation will fail.
    Example:
```
 

 BatchWriteResult batchResult = enhancedClient.batchWriteItem(
     BatchWriteItemEnhancedRequest.builder()
                                  .writeBatches(WriteBatch.builder(FirstItem.class)
                                                          .mappedTableResource(firstItemTable)
                                                          .addPutItem(PutItemEnhancedRequest.builder().item(item1).build())
                                                          .addDeleteItem(DeleteItemEnhancedRequest.builder()
                                                                                                  .key(key2)
                                                                                                  .build())
                                                          .build(),
                                                WriteBatch.builder(SecondItem.class)
                                                          .mappedTableResource(secondItemTable)
                                                          .addPutItem(PutItemEnhancedRequest.builder().item(item3).build())
                                                          .build())
                                  .build());
 
 
```
    Parameters:
    
    request - A BatchWriteItemEnhancedRequest containing keys and items grouped by tables.
    
    Returns:
    
    a BatchWriteResult containing any unprocessed requests.
  - batchWriteItem
```
default BatchWriteResult batchWriteItem(Consumer<BatchWriteItemEnhancedRequest.Builder> requestConsumer)
```
    Puts and/or deletes multiple items in one or more tables. BatchWriteItem is a composite operation where the request contains one batch of (a mix of) PutItemEnhancedRequest and DeleteItemEnhancedRequest per targeted table.
    The additional configuration parameters that the enhanced client supports are defined in the BatchWriteItemEnhancedRequest.
    Note: BatchWriteItem cannot update items. Instead, use the individual updateItem operation DynamoDbTable.updateItem(UpdateItemEnhancedRequest).
    Partial updates
    Each delete or put call is atomic, but the operation as a whole is not. If individual operations fail due to exceeded provisional throughput internal DynamoDb processing failures, the failed requests can be retrieved through the result, see BatchWriteResult.
    There are some conditions that cause the whole batch operation to fail. These include non-existing tables, erroneously defined primary key attributes, attempting to put and delete the same item as well as referring more than once to the same hash and range (sort) key.
    This operation calls the low-level DynamoDB API BatchWriteItem operation. Consult the BatchWriteItem documentation for further details and constraints, current limits of data to write and/or delete, how to handle partial updates and retries and under which conditions the operation will fail.
    Note: This is a convenience method that creates an instance of the request builder avoiding the need to create one manually via BatchWriteItemEnhancedRequest.builder().
    Example:
```
 

 BatchWriteResult batchResult = enhancedClient.batchWriteItem(r -> r.writeBatches(
     WriteBatch.builder(FirstItem.class)
               .mappedTableResource(firstItemTable)
               .addPutItem(i -> i.item(item1))
               .addDeleteItem(i -> i.key(key2))
               .build(),
     WriteBatch.builder(SecondItem.class)
               .mappedTableResource(secondItemTable)
               .addPutItem(i -> i.item(item3))
               .build()));
 
 
```
    Parameters:
    
    requestConsumer - a Consumer of BatchWriteItemEnhancedRequest containing keys and items grouped by tables.
    
    Returns:
    
    a BatchWriteResult containing any unprocessed requests.
  - transactGetItems
```
default List<Document> transactGetItems(TransactGetItemsEnhancedRequest request)
```
    Retrieves multiple items from one or more tables in a single atomic transaction. TransactGetItem is a composite operation where the request contains a set of up to 25 get requests, each containing a table reference and a GetItemEnhancedRequest. The list of results correspond to the ordering of the request definitions; for example the third addGetItem() call on the request builder will match the third result (index 2) of the result.
    The additional configuration parameters that the enhanced client supports are defined in the TransactGetItemsEnhancedRequest.
    DynamoDb will reject a call to TransactGetItems if the call exceeds limits such as provisioned throughput or allowed size of items, if the request contains errors or if there are conflicting operations accessing the same item, for instance updating and reading at the same time.
    This operation calls the low-level DynamoDB API TransactGetItems operation. Consult the TransactGetItems documentation for further details and constraints.
    Examples:
```
 

 List<TransactGetResultPage> results = enhancedClient.transactGetItems(
            TransactGetItemsEnhancedRequest.builder()
                                           .addGetItem(firstItemTable, GetItemEnhancedRequest.builder().key(key1).build())
                                           .addGetItem(firstItemTable, GetItemEnhancedRequest.builder().key(key2).build())
                                           .addGetItem(firstItemTable, GetItemEnhancedRequest.builder().key(key3).build())
                                           .addGetItem(secondItemTable, GetItemEnhancedRequest.builder().key(key4).build())
                                           .build());
 MyItem item = results.get(3).getItem(secondItemTable);
 
 
```
    Parameters:
    
    request - A TransactGetItemsEnhancedRequest containing keys with table references.
    
    Returns:
    
    a list of Document with the results.
  - transactGetItems
```
default List<Document> transactGetItems(Consumer<TransactGetItemsEnhancedRequest.Builder> requestConsumer)
```
    Retrieves multiple items from one or more tables in a single atomic transaction. TransactGetItem is a composite operation where the request contains a set of up to 25 get requests, each containing a table reference and a GetItemEnhancedRequest. The list of results correspond to the ordering of the request definitions; for example the third addGetItem() call on the request builder will match the third result (index 2) of the result.
    The additional configuration parameters that the enhanced client supports are defined in the TransactGetItemsEnhancedRequest.
    DynamoDb will reject a call to TransactGetItems if the call exceeds limits such as provisioned throughput or allowed size of items, if the request contains errors or if there are conflicting operations accessing the same item, for instance updating and reading at the same time.
    This operation calls the low-level DynamoDB API TransactGetItems operation. Consult the TransactGetItems documentation for further details and constraints.
    Note: This is a convenience method that creates an instance of the request builder avoiding the need to create one manually via TransactGetItemsEnhancedRequest.builder().
    Examples:
```
 

 List<TransactGetResultPage> results = enhancedClient.transactGetItems(
     r -> r.addGetItem(firstItemTable, i -> i.key(k -> k.partitionValue(0)))
           .addGetItem(firstItemTable, i -> i.key(k -> k.partitionValue(1)))
           .addGetItem(firstItemTable, i -> i.key(k -> k.partitionValue(2)))
           .addGetItem(secondItemTable, i -> i.key(k -> k.partitionValue(0))));
 MyItem item = results.get(3).getItem(secondItemTable);
 
 
```
    Parameters:
    
    requestConsumer - a Consumer of TransactGetItemsEnhancedRequest containing keys with table references.
    
    Returns:
    
    a list of Document with the results.
  - transactWriteItems
```
default Void transactWriteItems(TransactWriteItemsEnhancedRequest request)
```
    Writes and/or modifies multiple items from one or more tables in a single atomic transaction. TransactGetItem is a composite operation where the request contains a set of up to 25 action requests, each containing a table reference and one of the following requests:
    - Condition check of item - ConditionCheck
    - Delete item - DeleteItemEnhancedRequest
    - Put item - PutItemEnhancedRequest
    - Update item - UpdateItemEnhancedRequest
    The additional configuration parameters that the enhanced client supports are defined in the TransactWriteItemsEnhancedRequest.
    DynamoDb will reject a call to TransactWriteItems if the call exceeds limits such as provisioned throughput or allowed size of items, if the request contains errors or if there are conflicting operations accessing the same item. If the request contains condition checks that aren't met, this will also cause rejection.
    This operation calls the low-level DynamoDB API TransactWriteItems operation. Consult the TransactWriteItems documentation for further details and constraints, current limits of data to write and/or delete and under which conditions the operation will fail.
    Example:
```
 

 result = enhancedClient.transactWriteItems(
     TransactWriteItemsEnhancedRequest.builder()
                                      .addPutItem(firstItemTable, PutItemEnhancedRequest.builder().item(item1).build())
                                      .addDeleteItem(firstItemTable, DeleteItemEnhancedRequest.builder().key(key2).build())
                                      .addConditionCheck(firstItemTable,
                                                         ConditionCheck.builder()
                                                                       .key(key3)
                                                                       .conditionExpression(conditionExpression)
                                                                       .build())
                                      .addUpdateItem(secondItemTable,
                                                     UpdateItemEnhancedRequest.builder().item(item4).build())
                                      .build());
 
 
```
    Parameters:
    
    request - A BatchWriteItemEnhancedRequest containing keys grouped by tables.
  - transactWriteItems
```
default Void transactWriteItems(Consumer<TransactWriteItemsEnhancedRequest.Builder> requestConsumer)
```
    Writes and/or modifies multiple items from one or more tables in a single atomic transaction. TransactGetItem is a composite operation where the request contains a set of up to 25 action requests, each containing a table reference and one of the following requests:
    - Condition check of item - ConditionCheck
    - Delete item - DeleteItemEnhancedRequest
    - Put item - PutItemEnhancedRequest
    - Update item - UpdateItemEnhancedRequest
    The additional configuration parameters that the enhanced client supports are defined in the TransactWriteItemsEnhancedRequest.
    DynamoDb will reject a call to TransactWriteItems if the call exceeds limits such as provisioned throughput or allowed size of items, if the request contains errors or if there are conflicting operations accessing the same item. If the request contains condition checks that aren't met, this will also cause rejection.
    This operation calls the low-level DynamoDB API TransactWriteItems operation. Consult the TransactWriteItems documentation for further details and constraints, current limits of data to write and/or delete and under which conditions the operation will fail.
    Note: This is a convenience method that creates an instance of the request builder avoiding the need to create one manually via TransactWriteItemsEnhancedRequest.builder().
    Example:
```
 

 result = enhancedClient.transactWriteItems(r -> r.addPutItem(firstItemTable, i -> i.item(item1))
                                                  .addDeleteItem(firstItemTable, i -> i.key(k -> k.partitionValue(2)))
                                                  .addConditionCheck(firstItemTable,
                                                                 i -> i.key(key3).conditionExpression(conditionExpression))
                                                  .addUpdateItem(secondItemTable, i -> i.item(item4)));
 
 
```
    Parameters:
    
    requestConsumer - a Consumer of TransactWriteItemsEnhancedRequest containing keys and items grouped by tables.
  - builder
```
static DynamoDbEnhancedClient.Builder builder()
```
    Creates a default builder for DynamoDbEnhancedClient.
  - create
```
static DynamoDbEnhancedClient create()
```
    Creates a DynamoDbEnhancedClient with a default DynamoDbClient

Interface DynamoDbEnhancedClient

Nested Class Summary

Method Summary

Method Detail

table

batchGetItem

batchGetItem

batchWriteItem

batchWriteItem

transactGetItems

transactGetItems

transactWriteItems

transactWriteItems

builder

create