com.datastax.driver.core.querybuilder

Class Delete.Conditions

java.lang.Object

com.datastax.driver.core.Statement

com.datastax.driver.core.RegularStatement

com.datastax.driver.core.querybuilder.BuiltStatement

com.datastax.driver.core.querybuilder.Delete.Conditions

Enclosing class:

Delete

public static class Delete.Conditions
extends BuiltStatement

Conditions for a DELETE statement.

When provided some conditions, a deletion will not apply unless the provided conditions applies.

Please keep in mind that provided conditions have a non negligible performance impact and should be avoided when possible.

Field Summary

Fields inherited from class com.datastax.driver.core.Statement

idempotent

Method Summary

Methods

Modifier and Type	Method and Description
Delete.Conditions	and(Clause condition) Adds the provided condition for the deletion.
Statement	disableTracing() Disables tracing for this query.
Statement	enableTracing() Enables tracing for this query.
ConsistencyLevel	getConsistencyLevel() The consistency level for this query.
String	getKeyspace() Returns the keyspace this query operates on.
String	getQueryString() Returns the query string for this statement.
RetryPolicy	getRetryPolicy() Returns the retry policy sets for this query, if any.
ByteBuffer	getRoutingKey() Returns the routing key (in binary raw form) to use for token aware routing of this query.
ByteBuffer[]	getValues() The values to use for this statement.
boolean	isTracing() Returns whether tracing is enabled for this query or not.
Statement	setConsistencyLevel(ConsistencyLevel consistency) Sets the consistency level for the query.
RegularStatement	setForceNoValues(boolean forceNoValues) Allows to force this builder to not generate values (through its getValues() method).
Statement	setRetryPolicy(RetryPolicy policy) Sets the retry policy to use for this query.
String	toString()
Delete.Options	using(Using using) Adds an option to the DELETE statement these conditions are part of.
Delete.Where	where(Clause clause) Adds a where clause to the DELETE statement these conditions are part of.

Methods inherited from class com.datastax.driver.core.querybuilder.BuiltStatement

escapeId, isIdempotent

Methods inherited from class com.datastax.driver.core.Statement

getFetchSize, getSerialConsistencyLevel, setFetchSize, setIdempotent, setPagingState, setSerialConsistencyLevel

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

and

public Delete.Conditions and(Clause condition)

Adds the provided condition for the deletion.

Note that while the query builder accept any type of Clause as conditions, Cassandra currently only allows equality ones.

Parameters:

condition - the condition to add.

Returns:

this Conditions clause.

where

public Delete.Where where(Clause clause)

Adds a where clause to the DELETE statement these conditions are part of.

Parameters:

clause - clause to add.

Returns:

the WHERE clause of the DELETE statement these conditions are part of.

using

public Delete.Options using(Using using)

Adds an option to the DELETE statement these conditions are part of.

Parameters:

using - the using clause to add.

Returns:

the options of the DELETE statement these conditions are part of.

getQueryString

public String getQueryString()

Description copied from class: RegularStatement

Returns the query string for this statement.

Overrides:

getQueryString in class BuiltStatement

Returns:

a valid CQL query string.

getRoutingKey

public ByteBuffer getRoutingKey()

Description copied from class: Statement

Returns the routing key (in binary raw form) to use for token aware routing of this query.

The routing key is optional in that implementers are free to return null. The routing key is an hint used for token-aware routing (see TokenAwarePolicy), and if provided should correspond to the binary value for the query partition key. However, not providing a routing key never causes a query to fail and if the load balancing policy used is not token aware, then the routing key can be safely ignored.

Overrides:

getRoutingKey in class BuiltStatement

Returns:

the routing key for this query or null.

getKeyspace

public String getKeyspace()

Description copied from class: Statement

Returns the keyspace this query operates on.

Note that not all query specify on which keyspace they operate on, and so this method can always return null. Firstly, some queries do not operate inside a keyspace: keyspace creation, USE queries, user creation, etc. Secondly, even query that operate within a keyspace do not have to specify said keyspace directly, in which case the currently logged in keyspace (the one set through a USE query (or through the use of Cluster.connect(String))). Lastly, as for the routing key, this keyspace information is only a hint for token-aware routing (since replica placement depend on the replication strategy in use which is a per-keyspace property) and having this method return null (or even a bogus keyspace name) will never cause the query to fail.

Overrides:

getKeyspace in class BuiltStatement

Returns:

the keyspace this query operate on if relevant or null.

setForceNoValues

public RegularStatement setForceNoValues(boolean forceNoValues)

Description copied from class: BuiltStatement

Allows to force this builder to not generate values (through its getValues() method).

By default (and unless the protocol version 1 is in use, see below) and for performance reasons, the query builder will not serialize all values provided to strings. This means that the BuiltStatement.getQueryString() may return a query string with bind markers (where and when is at the discretion of the builder) and BuiltStatement.getValues() will return the binary values for those markers. This method allows to force the builder to not generate binary values but rather to serialize them all in the query string. In practice, this means that if you call setForceNoValues(true), you are guaranteed that getValues() will return null and that the string returned by getQueryString() will contain no other bind markers than the one inputted by the user.

If the native protocol version 1 is in use, the driver will default to not generating values since those are not supported by that version of the protocol. In practice, the driver will automatically call this method with true as argument prior to execution. Hence, calling this method when the protocol version 1 is in use is basically a no-op.

Note that this method is mainly useful for debugging purpose. In general, the default behavior should be the correct and most efficient one.

Overrides:

setForceNoValues in class BuiltStatement

Parameters:

forceNoValues - whether or not this builder may generate values.

Returns:

this statement.

setConsistencyLevel

public Statement setConsistencyLevel(ConsistencyLevel consistency)

Description copied from class: Statement

Sets the consistency level for the query.

Overrides:

setConsistencyLevel in class Statement

Parameters:

consistency - the consistency level to set.

Returns:

this Statement object.

getConsistencyLevel

public ConsistencyLevel getConsistencyLevel()

Description copied from class: Statement

The consistency level for this query.

Overrides:

getConsistencyLevel in class Statement

Returns:

the consistency level for this query, or null if no consistency level has been specified (through setConsistencyLevel). In the latter case, the default consistency level will be used.

enableTracing

public Statement enableTracing()

Description copied from class: Statement

Enables tracing for this query. By default (that is unless you call this method), tracing is not enabled.

Overrides:

enableTracing in class Statement

Returns:

this Statement object.

disableTracing

public Statement disableTracing()

Description copied from class: Statement

Disables tracing for this query.

Overrides:

disableTracing in class Statement

Returns:

this Statement object.

isTracing

public boolean isTracing()

Description copied from class: Statement

Returns whether tracing is enabled for this query or not.

Overrides:

isTracing in class Statement

Returns:

true if this query has tracing enabled, false otherwise.

setRetryPolicy

public Statement setRetryPolicy(RetryPolicy policy)

Description copied from class: Statement

Sets the retry policy to use for this query.

The default retry policy, if this method is not called, is the one returned by Policies.getRetryPolicy() in the cluster configuration. This method is thus only useful in case you want to punctually override the default policy for this request.

Overrides:

setRetryPolicy in class Statement

Parameters:

policy - the retry policy to use for this query.

Returns:

this Statement object.

getRetryPolicy

public RetryPolicy getRetryPolicy()

Description copied from class: Statement

Returns the retry policy sets for this query, if any.

Overrides:

getRetryPolicy in class Statement

Returns:

the retry policy sets specifically for this query or null if no query specific retry policy has been set through Statement.setRetryPolicy(com.datastax.driver.core.policies.RetryPolicy) (in which case the Cluster retry policy will apply if necessary).

getValues

public ByteBuffer[] getValues()

Description copied from class: RegularStatement

The values to use for this statement.

Note: Values for a RegularStatement (i.e. if this method does not return null) are not supported with the native protocol version 1: you will get an UnsupportedProtocolVersionException when submitting one if version 1 of the protocol is in use (i.e. if you've force version 1 through Cluster.Builder.withProtocolVersion(int) or you use Cassandra 1.2).

Overrides:

getValues in class BuiltStatement

Returns:

the values to use for this statement or null if there is no such values.

See Also:

SimpleStatement.SimpleStatement(String, Object...)

toString

public String toString()

Overrides:

toString in class BuiltStatement