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NativeJdbcExtractorAdapter (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.jdbc.support.nativejdbc
Class NativeJdbcExtractorAdapter

java.lang.Object
  org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter

All Implemented Interfaces:

NativeJdbcExtractor

Direct Known Subclasses:

C3P0NativeJdbcExtractor, CommonsDbcpNativeJdbcExtractor, JBossNativeJdbcExtractor, SimpleNativeJdbcExtractor, WebLogicNativeJdbcExtractor, WebSphereNativeJdbcExtractor, XAPoolNativeJdbcExtractor

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public abstract class NativeJdbcExtractorAdapter
extends Object
implements NativeJdbcExtractor

Abstract adapter class for the NativeJdbcExtractor interface, for simplified implementation of basic extractors. Basically returns the passed-in JDBC objects on all methods.

getNativeConnection checks for a ConnectionProxy chain, for example from a TransactionAwareDataSourceProxy, before delegating to doGetNativeConnection for actual unwrapping. You can override either of the two for a specific connection pool, but the latter is recommended to participate in ConnectionProxy unwrapping.

getNativeConnection also applies a fallback if the first native extraction process failed, that is, returned the same Connection as passed in. It assumes that some additional proxying is going in this case: Hence, it retrieves the underlying native Connection from the DatabaseMetaData via conHandle.getMetaData().getConnection() and retries the native extraction process based on that Connection handle. This works, for example, for the Connection proxies exposed by Hibernate 3.1's Session.connection().

The getNativeConnectionFromStatement method is implemented to simply delegate to getNativeConnection with the Statement's Connection. This is what most extractor implementations will stick to, unless there's a more efficient version for a specific pool.

Since:

1.1

Author:

Juergen Hoeller

See Also:

getNativeConnection(java.sql.Connection), getNativeConnectionFromStatement(java.sql.Statement), ConnectionProxy

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Constructor Summary
NativeJdbcExtractorAdapter()

 

Method Summary
protected  Connection	doGetNativeConnection(Connection con)           Not able to unwrap: return passed-in Connection.
CallableStatement	getNativeCallableStatement(CallableStatement cs)           Not able to unwrap: return passed-in CallableStatement.
Connection	getNativeConnection(Connection con)           Check for a ConnectionProxy chain, then delegate to doGetNativeConnection.
Connection	getNativeConnectionFromStatement(Statement stmt)           Retrieve the Connection via the Statement's Connection.
PreparedStatement	getNativePreparedStatement(PreparedStatement ps)           Not able to unwrap: return passed-in PreparedStatement.
ResultSet	getNativeResultSet(ResultSet rs)           Not able to unwrap: return passed-in ResultSet.
Statement	getNativeStatement(Statement stmt)           Not able to unwrap: return passed-in Statement.
boolean	isNativeConnectionNecessaryForNativeCallableStatements()           Return false by default.
boolean	isNativeConnectionNecessaryForNativePreparedStatements()           Return false by default.
boolean	isNativeConnectionNecessaryForNativeStatements()           Return false by default.

 

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

 

Constructor Detail

NativeJdbcExtractorAdapter

public NativeJdbcExtractorAdapter()

Method Detail

isNativeConnectionNecessaryForNativeStatements

public boolean isNativeConnectionNecessaryForNativeStatements()

Return false by default.

Specified by:

isNativeConnectionNecessaryForNativeStatements in interface NativeJdbcExtractor

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isNativeConnectionNecessaryForNativePreparedStatements

public boolean isNativeConnectionNecessaryForNativePreparedStatements()

Return false by default.

Specified by:

isNativeConnectionNecessaryForNativePreparedStatements in interface NativeJdbcExtractor

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isNativeConnectionNecessaryForNativeCallableStatements

public boolean isNativeConnectionNecessaryForNativeCallableStatements()

Return false by default.

Specified by:

isNativeConnectionNecessaryForNativeCallableStatements in interface NativeJdbcExtractor

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getNativeConnection

public Connection getNativeConnection(Connection con)
                               throws SQLException

Check for a ConnectionProxy chain, then delegate to doGetNativeConnection.

ConnectionProxy is used by Spring's TransactionAwareDataSourceProxy and LazyConnectionDataSourceProxy. The target connection behind it is typically one from a local connection pool, to be unwrapped by the doGetNativeConnection implementation of a concrete subclass.

Specified by:

getNativeConnection in interface NativeJdbcExtractor

Parameters:

con - the Connection handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC Connection, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

See Also:

doGetNativeConnection(java.sql.Connection), ConnectionProxy, DataSourceUtils.getTargetConnection(java.sql.Connection), TransactionAwareDataSourceProxy, LazyConnectionDataSourceProxy

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doGetNativeConnection

protected Connection doGetNativeConnection(Connection con)
                                    throws SQLException

Not able to unwrap: return passed-in Connection.

Throws:

SQLException

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getNativeConnectionFromStatement

public Connection getNativeConnectionFromStatement(Statement stmt)
                                            throws SQLException

Retrieve the Connection via the Statement's Connection.

Specified by:

getNativeConnectionFromStatement in interface NativeJdbcExtractor

Parameters:

stmt - the Statement handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC Connection, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

See Also:

getNativeConnection(java.sql.Connection), Statement.getConnection()

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getNativeStatement

public Statement getNativeStatement(Statement stmt)
                             throws SQLException

Not able to unwrap: return passed-in Statement.

Specified by:

getNativeStatement in interface NativeJdbcExtractor

Parameters:

stmt - the Statement handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC Statement, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

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getNativePreparedStatement

public PreparedStatement getNativePreparedStatement(PreparedStatement ps)
                                             throws SQLException

Not able to unwrap: return passed-in PreparedStatement.

Specified by:

getNativePreparedStatement in interface NativeJdbcExtractor

Parameters:

ps - the PreparedStatement handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC PreparedStatement, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

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getNativeCallableStatement

public CallableStatement getNativeCallableStatement(CallableStatement cs)
                                             throws SQLException

Not able to unwrap: return passed-in CallableStatement.

Specified by:

getNativeCallableStatement in interface NativeJdbcExtractor

Parameters:

cs - the CallableStatement handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC CallableStatement, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

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getNativeResultSet

public ResultSet getNativeResultSet(ResultSet rs)
                             throws SQLException

Not able to unwrap: return passed-in ResultSet.

Specified by:

getNativeResultSet in interface NativeJdbcExtractor

Parameters:

rs - the ResultSet handle, potentially wrapped by a connection pool

Returns:

the underlying native JDBC ResultSet, if possible; else, the original Connection

Throws:

SQLException - if thrown by JDBC methods

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