Package com.mchange.v2.c3p0

Interface C3P0ProxyStatement

All Superinterfaces:

java.lang.AutoCloseable, java.sql.Statement, java.sql.Wrapper

All Known Implementing Classes:

NewProxyCallableStatement, NewProxyPreparedStatement, NewProxyStatement

public interface C3P0ProxyStatement
extends java.sql.Statement

Most clients need never use or know about this interface -- c3p0-provided Statements can be treated like any other Statement.

An interface implemented by proxy Connections returned by c3p0 PooledDataSources. It provides protected access to the underlying dbms-vendor specific Connection, which may be useful if you want to access non-standard API offered by your jdbc driver.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.Object	RAW_STATEMENT	A token representing an unwrapped, unproxied jdbc Connection for use in rawStatementOperation(java.lang.reflect.Method, java.lang.Object, java.lang.Object[])

Fields inherited from interface java.sql.Statement

CLOSE_ALL_RESULTS, CLOSE_CURRENT_RESULT, EXECUTE_FAILED, KEEP_CURRENT_RESULT, NO_GENERATED_KEYS, RETURN_GENERATED_KEYS, SUCCESS_NO_INFO

Method Summary

Modifier and Type	Method	Description
java.lang.Object	rawStatementOperation(java.lang.reflect.Method m, java.lang.Object target, java.lang.Object[] args)	Allows one to work with the unproxied, raw vendor-provided Statement .

Methods inherited from interface java.sql.Statement

addBatch, cancel, clearBatch, clearWarnings, close, closeOnCompletion, enquoteIdentifier, enquoteLiteral, enquoteNCharLiteral, execute, execute, execute, execute, executeBatch, executeLargeBatch, executeLargeUpdate, executeLargeUpdate, executeLargeUpdate, executeLargeUpdate, executeQuery, executeUpdate, executeUpdate, executeUpdate, executeUpdate, getConnection, getFetchDirection, getFetchSize, getGeneratedKeys, getLargeMaxRows, getLargeUpdateCount, getMaxFieldSize, getMaxRows, getMoreResults, getMoreResults, getQueryTimeout, getResultSet, getResultSetConcurrency, getResultSetHoldability, getResultSetType, getUpdateCount, getWarnings, isClosed, isCloseOnCompletion, isPoolable, isSimpleIdentifier, setCursorName, setEscapeProcessing, setFetchDirection, setFetchSize, setLargeMaxRows, setMaxFieldSize, setMaxRows, setPoolable, setQueryTimeout

Methods inherited from interface java.sql.Wrapper

isWrapperFor, unwrap

Field Detail

RAW_STATEMENT

static final java.lang.Object RAW_STATEMENT

A token representing an unwrapped, unproxied jdbc Connection for use in rawStatementOperation(java.lang.reflect.Method, java.lang.Object, java.lang.Object[])

Method Detail

rawStatementOperation

java.lang.Object rawStatementOperation(java.lang.reflect.Method m,
                                       java.lang.Object target,
                                       java.lang.Object[] args)
                                throws java.lang.IllegalAccessException,
                                       java.lang.IllegalArgumentException,
                                       java.lang.reflect.InvocationTargetException,
                                       java.sql.SQLException

Allows one to work with the unproxied, raw vendor-provided Statement . Some database companies never got over the "common interfaces mean no more vendor lock-in!" thing, and offer non-standard API on their Statements. This method permits you to "pierce" the connection-pooling layer to call non-standard methods on the original Statement, or to pass the original Statement to functions that are not implementation neutral.

To use this functionality, you'll need to cast a Statement retrieved from a c3p0-provided Connection to a C3P0ProxyStatement.

This method works by making a reflective call of method m on Object target (which may be null for static methods), passing and argument list args. For the method target, or for any argument, you may substitute the special token C3P0ProxyStatement.RAW_STATEMENT

Any ResultSets returned by the operation will be proxied and c3p0-managed, meaning that these resources will be automatically closed if the user does not close them first when this Statement is closed or checked into the statement cache. Any other resources returned by the operation are the user's responsibility to clean up!

If you have turned statement pooling on, incautious use of this method can corrupt the PreparedStatement cache, by breaking the invariant that all cached PreparedStatements should be equivalent to a PreparedStatement newly created with the same arguments to prepareStatement(...) or prepareCall(...). If your vendor supplies API that allows you to modify the state or configuration of a Statement in some nonstandard way, and you do not undo this modification prior to closing the Statement or the Connection that prepared it, future preparers of the same Statement may or may not see your modification, depending on your use of the cache. Thus, it is inadvisable to use this method to call nonstandard mutators on PreparedStatements if statement pooling is turned on..

Throws:

java.lang.IllegalAccessException

java.lang.IllegalArgumentException

java.lang.reflect.InvocationTargetException

java.sql.SQLException