Update.IfExists (DataStax Java Driver for Apache Cassandra

java.lang.Object
- com.datastax.driver.core.Statement
- - com.datastax.driver.core.RegularStatement
  - - com.datastax.driver.core.querybuilder.BuiltStatement
    - - com.datastax.driver.core.querybuilder.Update.IfExists

Enclosing class:: Update

public static class Update.IfExists
extends BuiltStatement

Field Summary
- Fields inherited from class com.datastax.driver.core.Statement
  idempotent, NULL_PAYLOAD_VALUE

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`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(CodecRegistry codecRegistry)` Returns the query string for this statement.
`RetryPolicy`	`getRetryPolicy()` Returns the retry policy sets for this query, if any.
`ByteBuffer`	`getRoutingKey(ProtocolVersion protocolVersion, CodecRegistry codecRegistry)` Returns the routing key (in binary raw form) to use for token aware routing of this query.
`ByteBuffer[]`	`getValues(ProtocolVersion protocolVersion, CodecRegistry codecRegistry)` The positional values to use for this statement.
`boolean`	`hasValues()` Whether or not this statement has values, that is if `getValues` will return `null` or not.
`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()` Returns this statement as a CQL query string.

Methods inherited from class com.datastax.driver.core.querybuilder.BuiltStatement
escapeId, getNamedValues, getObject, getObject, hasValues, isIdempotent, usesNamedValues

Methods inherited from class com.datastax.driver.core.RegularStatement
getQueryString, requestSizeInBytes

Methods inherited from class com.datastax.driver.core.Statement
getDefaultTimestamp, getFetchSize, getHost, getNowInSeconds, getOutgoingPayload, getReadTimeoutMillis, getSerialConsistencyLevel, isBatchIdempotent, setDefaultTimestamp, setFetchSize, setHost, setIdempotent, setNowInSeconds, setOutgoingPayload, setPagingState, setPagingState, setPagingStateUnsafe, setReadTimeoutMillis, setSerialConsistencyLevel

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - getQueryString
```
public String getQueryString(CodecRegistry codecRegistry)
```
    Description copied from class: RegularStatement
    
    Returns the query string for this statement.
    It is important to note that the query string is merely a CQL representation of this statement, but it does not convey all the information stored in Statement objects.
    For example, Statement objects carry numerous protocol-level settings, such as the consistency level to use, or the idempotence flag, among others. None of these settings will be included in the resulting query string.
    Similarly, if values have been set on this statement because it has bind markers, these values will not appear in the resulting query string.
    Note: the consistency level was conveyed at CQL level in older versions of the CQL grammar, but since CASSANDRA-4734 it is now a protocol-level setting and consequently does not appear in the query string.
    
    Overrides:
    
    getQueryString in class BuiltStatement
    
    Parameters:
    
    codecRegistry - the codec registry that will be used if the actual implementation needs to serialize Java objects in the process of generating the query. Note that it might be possible to use the no-arg RegularStatement.getQueryString() depending on the type of statement this is called on.
    
    Returns:
    
    a valid CQL query string.
    
    See Also:
    
    RegularStatement.getQueryString()
  - getRoutingKey
```
public ByteBuffer getRoutingKey(ProtocolVersion protocolVersion,
                                CodecRegistry codecRegistry)
```
    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
    
    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 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 BuiltStatement.getQueryString(CodecRegistry) may return a query string with bind markers (where and when is at the discretion of the builder) and BuiltStatement.getValues(com.datastax.driver.core.ProtocolVersion, com.datastax.driver.core.CodecRegistry) will return the binary values for those markers. This method allows to force the builder to not generate binary values but rather to inline 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 ones specified 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(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...)
  - hasValues
```
public boolean hasValues()
```
    Description copied from class: RegularStatement
    Whether or not this statement has values, that is if getValues will return null or not.
    This method calls RegularStatement.hasValues(CodecRegistry) with ProtocolVersion.NEWEST_SUPPORTED. Whether you should use this or the other variant depends on the type of statement this is called on:
    - for a SimpleStatement or SchemaStatement, the codec registry isn't actually needed, so it's always safe to use this method;
    - for a BuiltStatement you can use this method if you use no custom codecs, or if your custom codecs are registered with the default registry. Otherwise, use the other method and provide the registry that contains your codecs (see BuiltStatement for more explanations on why this is so);
    - for a BatchStatement, use the first rule if it contains no built statements, or the second rule otherwise.
    Overrides:
    
    hasValues in class RegularStatement
    
    Returns:
    
    false if RegularStatement.getValues(com.datastax.driver.core.ProtocolVersion, com.datastax.driver.core.CodecRegistry) returns null, true otherwise.
  - toString
```
public String toString()
```
    Description copied from class: RegularStatement
    
    Returns this statement as a CQL query string.
    It is important to note that the query string is merely a CQL representation of this statement, but it does not convey all the information stored in Statement objects.
    See the javadocs of RegularStatement.getQueryString() for more information.
    
    Overrides:
    
    toString in class BuiltStatement
    
    Returns:
    
    this statement as a CQL query string.
    
    See Also:
    
    RegularStatement.getQueryString()

Class Update.IfExists

Field Summary

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

Method Summary

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

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

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

Methods inherited from class java.lang.Object

Method Detail

getQueryString

getRoutingKey

getKeyspace

setForceNoValues

setConsistencyLevel

getConsistencyLevel

enableTracing

disableTracing

isTracing

setRetryPolicy

getRetryPolicy

getValues

hasValues

toString