PreparedStatement (DataStax Java Driver for Apache Cassandra

java.lang.Object
- com.datastax.driver.core.PreparedStatement

```
public class PreparedStatement
extends Object
```
Represents a prepared statement, a query with bound variables that has been prepared (pre-parsed) by the database.
A prepared statement can be executed once concrete values have been provided for the bound variables. A prepared statement and the values for its bound variables constitute a BoundStatement and can be executed (by Session.execute(java.lang.String)).
A PreparedStatement object allows you to define specific defaults for the different properties of a Query (Consistency level, tracing, ...), in which case those properties will be inherited as default by every BoundedStatement created from the {PreparedStatement}. The default for those PreparedStatement properties is the same that in Query if the PreparedStatement is created by Session.prepare(String) but will inherit of the properties of the Statement used for the preparation if Session.prepare(Statement) is used.

Method Summary

Methods
Modifier and Type	Method and Description
`BoundStatement`	`bind()` Creates a new BoundStatement object for this prepared statement.
`BoundStatement`	`bind(Object... values)` Creates a new BoundStatement object and bind its variables to the provided values.
`PreparedStatement`	`disableTracing()` Convenience method to disable tracing for all bound statements created from this prepared statement.
`PreparedStatement`	`enableTracing()` Convenience method to enables tracing for all bound statements created from this prepared statement.
`ConsistencyLevel`	`getConsistencyLevel()` Returns the default consistency level set through `setConsistencyLevel(com.datastax.driver.core.ConsistencyLevel)`.
`String`	`getQueryKeyspace()` Returns the keyspace at the time that this prepared statement was prepared, (that is the one on which this statement applies unless it specified a keyspace explicitly).
`String`	`getQueryString()` Returns the string of the query that was prepared to yield this `PreparedStatement`.
`RetryPolicy`	`getRetryPolicy()` Returns the retry policy sets for this prepared statement, if any.
`ColumnDefinitions`	`getVariables()` Returns metadata on the bounded variables of this prepared statement.
`boolean`	`isTracing()` Returns whether tracing is enabled for this prepared statement, i.e.
`PreparedStatement`	`setConsistencyLevel(ConsistencyLevel consistency)` Sets a default consistency level for all bound statements created from this prepared statement.
`PreparedStatement`	`setRetryPolicy(RetryPolicy policy)` Convenience method to set a default retry policy for the `BoundStatement` created from this prepared statement.
`PreparedStatement`	`setRoutingKey(ByteBuffer... routingKeyComponents)` Sets the routing key for this query.
`PreparedStatement`	`setRoutingKey(ByteBuffer routingKey)` Sets the routing key for this prepared statement.

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

- Method Detail
  - getVariables
```
public ColumnDefinitions getVariables()
```
    Returns metadata on the bounded variables of this prepared statement.
    
    Returns:
    the variables bounded in this prepared statement.
  - bind
```
public BoundStatement bind(Object... values)
```
    Creates a new BoundStatement object and bind its variables to the provided values.
    While the number of values cannot be greater than the number of bound variables, the number of values may be fewer than the number of bound variables. In that case, the remaining variables will have to be bound to values by another mean because the resulting BoundStatement being executable.
    This method is a convenience for new BoundStatement(this).bind(...).
    
    Parameters:
    values - the values to bind to the variables of the newly created BoundStatement.
    
    Returns:
    the newly created BoundStatement with its variables bound to values.
    
    Throws:
    
    IllegalArgumentException - if more values are provided than there is of bound variables in this statement.
    
    InvalidTypeException - if any of the provided value is not of correct type to be bound to the corresponding bind variable.
    
    NullPointerException - if one of values is a collection (List, Set or Map) containing a null value. Nulls are not supported in collections by CQL.
    See Also:
    BoundStatement.bind(java.lang.Object...)
  - bind
```
public BoundStatement bind()
```
    Creates a new BoundStatement object for this prepared statement.
    This method do not bind any values to any of the prepared variables. Said values need to be bound on the resulting statement using BoundStatement's setters methods (BoundStatement.setInt(int, int), BoundStatement.setLong(int, long), ...).
    
    Returns:
    the newly created BoundStatement.
  - setRoutingKey
```
public PreparedStatement setRoutingKey(ByteBuffer routingKey)
```
    Sets the routing key for this prepared statement.
    While you can provide a fixed routing key for all executions of this prepared statement with this method, it is not mandatory to provide one through this method. This method should only be used if the partition key of the prepared query is not part of the prepared variables (that is if the partition key is fixed).
    Note that if the partition key is part of the prepared variables, the routing key will be automatically computed once those variables are bound.
    
    Parameters:
    routingKey - the raw (binary) value to use as routing key.
    
    Returns:
    this PreparedStatement object.
    See Also:
    Query.getRoutingKey()
  - setRoutingKey
```
public PreparedStatement setRoutingKey(ByteBuffer... routingKeyComponents)
```
    Sets the routing key for this query.
    See setRoutingKey(ByteBuffer) for more information. This method is a variant for when the query partition key is composite and the routing key must be built from multiple values.
    
    Parameters:
    routingKeyComponents - the raw (binary) values to compose to obtain the routing key.
    
    Returns:
    this PreparedStatement object.
    See Also:
    Query.getRoutingKey()
  - setConsistencyLevel
```
public PreparedStatement setConsistencyLevel(ConsistencyLevel consistency)
```
    Sets a default consistency level for all bound statements created from this prepared statement.
    If no consistency level is set through this method, the bound statement created from this object will use the default consistency level (ONE).
    Changing the default consistency level is not retroactive, it only applies to BoundStatement created after the change.
    
    Parameters:
    consistency - the default consistency level to set.
    
    Returns:
    this PreparedStatement object.
  - getConsistencyLevel
```
public ConsistencyLevel getConsistencyLevel()
```
    Returns the default consistency level set through setConsistencyLevel(com.datastax.driver.core.ConsistencyLevel).
    
    Returns:
    the default consistency level. Returns null if no consistency level has been set through this object setConsistencyLevel method.
  - getQueryString
```
public String getQueryString()
```
    Returns the string of the query that was prepared to yield this PreparedStatement.
    Note that a CQL3 query may be implicitly applied to the current keyspace (that is, if the keyspace is not explicitly qualified in the query itself). For prepared queries, the current keyspace used is the one at the time of the preparation, not the one at execution time. The current keyspace at the time of the preparation can be retrieved through getQueryKeyspace().
    
    Returns:
    the query that was prepared to yield this PreparedStatement.
  - getQueryKeyspace
```
public String getQueryKeyspace()
```
    Returns the keyspace at the time that this prepared statement was prepared, (that is the one on which this statement applies unless it specified a keyspace explicitly).
    
    Returns:
    the keyspace at the time that this statement was prepared or null if no keyspace was set when the query was prepared (which is possible since keyspaces can be explicitly qualified in queries and so may not require a current keyspace to be set).
  - enableTracing
```
public PreparedStatement enableTracing()
```
    Convenience method to enables tracing for all bound statements created from this prepared statement.
    
    Returns:
    this Query object.
  - disableTracing
```
public PreparedStatement disableTracing()
```
    Convenience method to disable tracing for all bound statements created from this prepared statement.
    
    Returns:
    this PreparedStatement object.
  - isTracing
```
public boolean isTracing()
```
    Returns whether tracing is enabled for this prepared statement, i.e. if BoundStatement created from it will use tracing by default.
    
    Returns:
    true if this prepared statement has tracing enabled, false otherwise.
  - setRetryPolicy
```
public PreparedStatement setRetryPolicy(RetryPolicy policy)
```
    Convenience method to set a default retry policy for the BoundStatement created from this prepared statement.
    Note that this method is competely optional. By default, the retry policy used is the one returned Policies.getRetryPolicy() in the cluster configuration. This method is only useful if you want to override this default policy for the BoundStatement created from this PreparedStatement. to punctually override the default policy for this request.
    
    Parameters:
    policy - the retry policy to use for this prepared statement.
    
    Returns:
    this PreparedStatement object.
  - getRetryPolicy
```
public RetryPolicy getRetryPolicy()
```
    Returns the retry policy sets for this prepared statement, if any.
    
    Returns:
    the retry policy sets specifically for this prepared statement or null if none have been set.

Class PreparedStatement

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getVariables

bind

bind

setRoutingKey

setRoutingKey

setConsistencyLevel

getConsistencyLevel

getQueryString

getQueryKeyspace

enableTracing

disableTracing

isTracing

setRetryPolicy

getRetryPolicy