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SimpleNativeJdbcExtractor (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 SimpleNativeJdbcExtractor

java.lang.Object
  extended by org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter
      extended by org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor
All Implemented Interfaces:
NativeJdbcExtractor
public class SimpleNativeJdbcExtractor
extends NativeJdbcExtractorAdapter

Simple implementation of the NativeJdbcExtractor interface. Assumes a pool that wraps Connection handles but not DatabaseMetaData: In this case, the underlying native Connection can be retrieved by simply calling conHandle.getMetaData().getConnection(). All other JDBC objects will be returned as passed in.

This extractor should work with any pool that does not wrap DatabaseMetaData, and will also work with any plain JDBC driver. Note that a pool can still wrap Statements, PreparedStatements, etc: The only requirement of this extractor is that java.sql.DatabaseMetaData does not get wrapped, returning the native Connection of the JDBC driver on metaData.getConnection().

Customize this extractor by setting the "nativeConnectionNecessaryForXxx" flags accordingly: If Statements, PreparedStatements, and/or CallableStatements are wrapped by your pool, set the corresponding "nativeConnectionNecessaryForXxx" flags to "true". If none of the statement types is wrapped - or you solely need Connection unwrapping in the first place -, the defaults are fine.

SimpleNativeJdbcExtractor is a common choice for use with OracleLobHandler, which just needs Connection unwrapping via the getNativeConnectionFromStatement method. This usage will work with almost any connection pool. Known to work are, for example:

For full usage with JdbcTemplate, i.e. to also provide Statement unwrapping:

Since:
05.12.2003
Author:
Juergen Hoeller
See Also:
DatabaseMetaData.getConnection(), NativeJdbcExtractorAdapter.getNativeConnection(java.sql.Connection), setNativeConnectionNecessaryForNativeStatements(boolean), setNativeConnectionNecessaryForNativePreparedStatements(boolean), setNativeConnectionNecessaryForNativeCallableStatements(boolean), CommonsDbcpNativeJdbcExtractor, JBossNativeJdbcExtractor, JdbcTemplate.setNativeJdbcExtractor(org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor), OracleLobHandler.setNativeJdbcExtractor(org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor)

Constructor Summary
SimpleNativeJdbcExtractor()
           
 
Method Summary
 boolean isNativeConnectionNecessaryForNativeCallableStatements()
          Return false by default.
 boolean isNativeConnectionNecessaryForNativePreparedStatements()
          Return false by default.
 boolean isNativeConnectionNecessaryForNativeStatements()
          Return false by default.
 void setNativeConnectionNecessaryForNativeCallableStatements(boolean nativeConnectionNecessary)
          Set whether it is necessary to work on the native Connection to receive native CallableStatements.
 void setNativeConnectionNecessaryForNativePreparedStatements(boolean nativeConnectionNecessary)
          Set whether it is necessary to work on the native Connection to receive native PreparedStatements.
 void setNativeConnectionNecessaryForNativeStatements(boolean nativeConnectionNecessaryForNativeStatements)
          Set whether it is necessary to work on the native Connection to receive native Statements.
 
Methods inherited from class org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter
doGetNativeConnection, getNativeCallableStatement, getNativeConnection, getNativeConnectionFromStatement, getNativePreparedStatement, getNativeResultSet, getNativeStatement
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SimpleNativeJdbcExtractor

public SimpleNativeJdbcExtractor()
Method Detail

setNativeConnectionNecessaryForNativeStatements

public void setNativeConnectionNecessaryForNativeStatements(boolean nativeConnectionNecessaryForNativeStatements)
Set whether it is necessary to work on the native Connection to receive native Statements. Default is "false". If true, the Connection will be unwrapped first to create a Statement.

This makes sense if you need to work with native Statements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on DatabaseMetaData.getConnection.

The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps Statements.

See Also:
Connection.createStatement(), DatabaseMetaData.getConnection()

isNativeConnectionNecessaryForNativeStatements

public boolean isNativeConnectionNecessaryForNativeStatements()
Description copied from class: NativeJdbcExtractorAdapter
Return false by default.

Specified by:
isNativeConnectionNecessaryForNativeStatements in interface NativeJdbcExtractor
Overrides:
isNativeConnectionNecessaryForNativeStatements in class NativeJdbcExtractorAdapter

setNativeConnectionNecessaryForNativePreparedStatements

public void setNativeConnectionNecessaryForNativePreparedStatements(boolean nativeConnectionNecessary)
Set whether it is necessary to work on the native Connection to receive native PreparedStatements. Default is "false". If true, the Connection will be unwrapped first to create a PreparedStatement.

This makes sense if you need to work with native PreparedStatements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on Statement.getConnection.

The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps PreparedStatements.

See Also:
Connection.prepareStatement(java.lang.String), DatabaseMetaData.getConnection()

isNativeConnectionNecessaryForNativePreparedStatements

public boolean isNativeConnectionNecessaryForNativePreparedStatements()
Description copied from class: NativeJdbcExtractorAdapter
Return false by default.

Specified by:
isNativeConnectionNecessaryForNativePreparedStatements in interface NativeJdbcExtractor
Overrides:
isNativeConnectionNecessaryForNativePreparedStatements in class NativeJdbcExtractorAdapter

setNativeConnectionNecessaryForNativeCallableStatements

public void setNativeConnectionNecessaryForNativeCallableStatements(boolean nativeConnectionNecessary)
Set whether it is necessary to work on the native Connection to receive native CallableStatements. Default is "false". If true, the Connection will be unwrapped first to create a CallableStatement.

This makes sense if you need to work with native CallableStatements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on Statement.getConnection.

The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps CallableStatements.

See Also:
Connection.prepareCall(java.lang.String), DatabaseMetaData.getConnection()

isNativeConnectionNecessaryForNativeCallableStatements

public boolean isNativeConnectionNecessaryForNativeCallableStatements()
Description copied from class: NativeJdbcExtractorAdapter
Return false by default.

Specified by:
isNativeConnectionNecessaryForNativeCallableStatements in interface NativeJdbcExtractor
Overrides:
isNativeConnectionNecessaryForNativeCallableStatements in class NativeJdbcExtractorAdapter
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