com.datastax.driver.core.querybuilder

Class Batch

java.lang.Object

com.datastax.driver.core.Statement

com.datastax.driver.core.RegularStatement

com.datastax.driver.core.querybuilder.BuiltStatement

com.datastax.driver.core.querybuilder.Batch

public class Batch
extends BuiltStatement

A built BATCH statement.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Batch.Options The options of a BATCH statement.

Field Summary

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

idempotent, NULL_PAYLOAD_VALUE

Method Summary

Modifier and Type	Method and Description
Batch	add(RegularStatement statement) Adds a new statement to this batch.
String	getKeyspace() Returns the keyspace of the first statement in this batch.
ByteBuffer	getRoutingKey(ProtocolVersion protocolVersion, CodecRegistry codecRegistry) Returns the first non-null routing key of the statements in this batch or null otherwise.
ByteBuffer[]	getValues(ProtocolVersion protocolVersion, CodecRegistry codecRegistry) The positional values to use for this statement.
Boolean	isIdempotent() Whether this statement is idempotent, i.e.
Batch.Options	using(Using using) Adds a new options for this BATCH statement.

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

escapeId, getNamedValues, getObject, getObject, getQueryString, hasValues, setForceNoValues, toString, usesNamedValues

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

getQueryString, hasValues, requestSizeInBytes

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

disableTracing, enableTracing, getConsistencyLevel, getDefaultTimestamp, getFetchSize, getHost, getNowInSeconds, getOutgoingPayload, getReadTimeoutMillis, getRetryPolicy, getSerialConsistencyLevel, isBatchIdempotent, isTracing, setConsistencyLevel, setDefaultTimestamp, setFetchSize, setHost, setIdempotent, setNowInSeconds, setOutgoingPayload, setPagingState, setPagingState, setPagingStateUnsafe, setReadTimeoutMillis, setRetryPolicy, setSerialConsistencyLevel

Methods inherited from class java.lang.Object

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

Method Detail

add

public Batch add(RegularStatement statement)

Adds a new statement to this batch.

Parameters:

statement - the new statement to add.

Returns:

this batch.

Throws:

IllegalArgumentException - if counter and non-counter operations are mixed.

getValues

public ByteBuffer[] getValues(ProtocolVersion protocolVersion,
                              CodecRegistry codecRegistry)

Description copied from class: RegularStatement

The positional values to use for this statement.

A statement can use either positional or named values, but not both. So if this method returns a non-null result, RegularStatement.getNamedValues(ProtocolVersion, CodecRegistry) will return null.

Values for a RegularStatement (i.e. if either 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 forced version 1 through Cluster.Builder.withProtocolVersion(com.datastax.driver.core.ProtocolVersion) or you use Cassandra 1.2).

Overrides:

getValues in class BuiltStatement

Parameters:

protocolVersion - the protocol version that will be used to serialize the values.

codecRegistry - the codec registry that will be used to serialize the values.

See Also:

SimpleStatement(String, Object...)

using

public Batch.Options using(Using using)

Adds a new options for this BATCH statement.

Parameters:

using - the option to add.

Returns:

the options of this BATCH statement.

getRoutingKey

public ByteBuffer getRoutingKey(ProtocolVersion protocolVersion,
                                CodecRegistry codecRegistry)

Returns the first non-null routing key of the statements in this batch or null otherwise.

Overrides:

getRoutingKey in class BuiltStatement

Parameters:

protocolVersion - the protocol version that will be used if the actual implementation needs to serialize something to compute the key.

codecRegistry - the codec registry that will be used if the actual implementation needs to serialize something to compute this key.

Returns:

the routing key for this batch statement.

getKeyspace

public String getKeyspace()

Returns the keyspace of the first statement in this batch.

Overrides:

getKeyspace in class BuiltStatement

Returns:

the keyspace of the first statement in this batch.

isIdempotent

public Boolean isIdempotent()

Description copied from class: Statement

Whether this statement is idempotent, i.e. whether it can be applied multiple times without changing the result beyond the initial application.

If a statement is not idempotent, the driver will ensure that it never gets executed more than once, which means:

• avoiding retries on write timeouts or request errors;
• never scheduling speculative executions.

(this behavior is implemented in the driver internals, the corresponding policies will not even be invoked).

Note that this method can return null, in which case the driver will default to QueryOptions.getDefaultIdempotence().

By default, this method returns null for all statements, except for

• BuiltStatement - value will be inferred from the query: if it updates counters, prepends/appends to a list, or uses a function call or QueryBuilder.raw(String) anywhere in an inserted value, the result will be false; otherwise it will be true.
• Batch and BatchStatement:
  1. If any statement in batch has isIdempotent() false - return false
  2. If no statements with isIdempotent() false, but some have isIdempotent() null - return null
  3. Otherwise - return true

In all cases, calling Statement.setIdempotent(boolean) forces a value that overrides calculated value.

Note that when a statement is prepared (Session.prepare(String)), its idempotence flag will be propagated to all PreparedStatements created from it.

Overrides:

isIdempotent in class BuiltStatement

Returns:

whether this statement is idempotent, or null to use QueryOptions.getDefaultIdempotence().