org.springframework.jdbc.support.nativejdbc
Class SimpleNativeJdbcExtractor

java.lang.Object
  org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter
      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 NativeJdbcExtractorAdapter.getNativeConnectionFromStatement(java.sql.Statement) method. This usage will work with almost any connection pool. Known to work are, for example:

• Caucho Resin 2.1.x, 3.0.x
• Sun Java System Application Server 8
• Oracle OC4J 9.0.3, 9.0.4
• C3P0 0.8.x
• Jakarta Commons DBCP 1.0, 1.1, 1.2 (used in Tomcat 4.1.x, 5.0.x)
• JBoss 3.2.x

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

• Use a default SimpleNativeJdbcExtractor for Resin and SJSAS (no JDBC Statement objects are wrapped, therefore no special unwrapping is necessary).
• Use a SimpleNativeJdbcExtractor with all "nativeConnectionNecessaryForXxx" flags set to "true" for OC4J and C3P0 (all JDBC Statement objects are wrapped, but none of the wrappers allow for unwrapping).
• Use a CommonsDbcpNativeJdbcExtractor for Jakarta Commons DBCP respectively a JBossNativeJdbcExtractor for JBoss (all JDBC Statement objects are wrapped, but all of them can be extracted by casting to implementation classes).

Since:

05.12.2003

Author:

Juergen Hoeller

See Also:

setNativeConnectionNecessaryForNativeStatements(boolean), setNativeConnectionNecessaryForNativePreparedStatements(boolean), setNativeConnectionNecessaryForNativeCallableStatements(boolean), Jdbc4NativeJdbcExtractor, 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