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SingleConnectionDataSource (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.jdbc.datasource
Class SingleConnectionDataSource

java.lang.Object
  org.springframework.jdbc.datasource.AbstractDataSource
      org.springframework.jdbc.datasource.DriverManagerDataSource
          org.springframework.jdbc.datasource.SingleConnectionDataSource

All Implemented Interfaces:

Wrapper, CommonDataSource, DataSource, DisposableBean, SmartDataSource

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public class SingleConnectionDataSource
extends DriverManagerDataSource
implements SmartDataSource, DisposableBean

Implementation of SmartDataSource that wraps a single Connection which is not closed after use. Obviously, this is not multi-threading capable.

Note that at shutdown, someone should close the underlying Connection via the close() method. Client code will never call close on the Connection handle if it is SmartDataSource-aware (e.g. uses DataSourceUtils.releaseConnection).

If client code will call close() in the assumption of a pooled Connection, like when using persistence tools, set "suppressClose" to "true". This will return a close-suppressing proxy instead of the physical Connection. Be aware that you will not be able to cast this to a native OracleConnection or the like anymore (you need to use a NativeJdbcExtractor for this then).

This is primarily intended for testing. For example, it enables easy testing outside an application server, for code that expects to work on a DataSource. In contrast to DriverManagerDataSource, it reuses the same Connection all the time, avoiding excessive creation of physical Connections.

Author:

Rod Johnson, Juergen Hoeller

See Also:

getConnection(), Connection.close(), DataSourceUtils.releaseConnection(java.sql.Connection, javax.sql.DataSource), NativeJdbcExtractor

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Field Summary

 

Fields inherited from class org.springframework.jdbc.datasource.AbstractDataSource
logger

 

Constructor Summary
SingleConnectionDataSource()           Constructor for bean-style configuration.
SingleConnectionDataSource(Connection target, boolean suppressClose)           Create a new SingleConnectionDataSource with a given Connection.
SingleConnectionDataSource(String url, boolean suppressClose)           Create a new SingleConnectionDataSource with the given standard DriverManager parameters.
SingleConnectionDataSource(String url, String username, String password, boolean suppressClose)           Create a new SingleConnectionDataSource with the given standard DriverManager parameters.
SingleConnectionDataSource(String driverClassName, String url, String username, String password, boolean suppressClose)           Create a new SingleConnectionDataSource with the given standard DriverManager parameters.

 

Method Summary
void	destroy()           Close the underlying Connection.
protected  Boolean	getAutoCommitValue()           Return whether the returned Connection's "autoCommit" setting should be overridden.
protected  Connection	getCloseSuppressingConnectionProxy(Connection target)           Wrap the given Connection with a proxy that delegates every method call to it but suppresses close calls.
Connection	getConnection()           This implementation delegates to getConnectionFromDriverManager, using the default username and password of this DataSource.
Connection	getConnection(String username, String password)           Specifying a custom username and password doesn't make sense with a single Connection.
void	initConnection()           Initialize the underlying Connection via the DriverManager.
protected  boolean	isSuppressClose()           Return whether the returned Connection will be a close-suppressing proxy or the physical Connection.
protected  void	prepareConnection(Connection con)           Prepare the given Connection before it is exposed.
void	resetConnection()           Reset the underlying shared Connection, to be reinitialized on next access.
void	setAutoCommit(boolean autoCommit)           Set whether the returned Connection's "autoCommit" setting should be overridden.
void	setSuppressClose(boolean suppressClose)           Set whether the returned Connection should be a close-suppressing proxy or the physical Connection.
boolean	shouldClose(Connection con)           This is a single Connection: Do not close it when returning to the "pool".

 

Methods inherited from class org.springframework.jdbc.datasource.DriverManagerDataSource
getConnectionFromDriverManager, getConnectionFromDriverManager, getConnectionFromDriverManager, getConnectionProperties, getDriverClassName, getPassword, getUrl, getUsername, setConnectionProperties, setDriverClassName, setPassword, setUrl, setUsername

 

Methods inherited from class org.springframework.jdbc.datasource.AbstractDataSource
getLoginTimeout, getLogWriter, isWrapperFor, setLoginTimeout, setLogWriter, unwrap

 

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

 

Methods inherited from interface javax.sql.CommonDataSource
getLoginTimeout, getLogWriter, setLoginTimeout, setLogWriter

 

Methods inherited from interface java.sql.Wrapper
isWrapperFor, unwrap

 

Constructor Detail

SingleConnectionDataSource

public SingleConnectionDataSource()

Constructor for bean-style configuration.

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SingleConnectionDataSource

public SingleConnectionDataSource(String driverClassName,
                                  String url,
                                  String username,
                                  String password,
                                  boolean suppressClose)
                           throws CannotGetJdbcConnectionException

Create a new SingleConnectionDataSource with the given standard DriverManager parameters.

Parameters:

driverClassName - the JDBC driver class name

url - the JDBC URL to use for accessing the DriverManager

username - the JDBC username to use for accessing the DriverManager

password - the JDBC password to use for accessing the DriverManager

suppressClose - if the returned Connection should be a close-suppressing proxy or the physical Connection

Throws:

CannotGetJdbcConnectionException

See Also:

DriverManager.getConnection(String, String, String)

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SingleConnectionDataSource

public SingleConnectionDataSource(String url,
                                  String username,
                                  String password,
                                  boolean suppressClose)
                           throws CannotGetJdbcConnectionException

Create a new SingleConnectionDataSource with the given standard DriverManager parameters.

Parameters:

url - the JDBC URL to use for accessing the DriverManager

username - the JDBC username to use for accessing the DriverManager

password - the JDBC password to use for accessing the DriverManager

suppressClose - if the returned Connection should be a close-suppressing proxy or the physical Connection

Throws:

CannotGetJdbcConnectionException

See Also:

DriverManager.getConnection(String, String, String)

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SingleConnectionDataSource

public SingleConnectionDataSource(String url,
                                  boolean suppressClose)
                           throws CannotGetJdbcConnectionException

Create a new SingleConnectionDataSource with the given standard DriverManager parameters.

Parameters:

url - the JDBC URL to use for accessing the DriverManager

suppressClose - if the returned Connection should be a close-suppressing proxy or the physical Connection

Throws:

CannotGetJdbcConnectionException

See Also:

DriverManager.getConnection(String, String, String)

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SingleConnectionDataSource

public SingleConnectionDataSource(Connection target,
                                  boolean suppressClose)

Create a new SingleConnectionDataSource with a given Connection.

Parameters:

target - underlying target Connection

suppressClose - if the Connection should be wrapped with a Connection that suppresses close() calls (to allow for normal close() usage in applications that expect a pooled Connection but do not know our SmartDataSource interface)

Method Detail

setSuppressClose

public void setSuppressClose(boolean suppressClose)

Set whether the returned Connection should be a close-suppressing proxy or the physical Connection.

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isSuppressClose

protected boolean isSuppressClose()

Return whether the returned Connection will be a close-suppressing proxy or the physical Connection.

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setAutoCommit

public void setAutoCommit(boolean autoCommit)

Set whether the returned Connection's "autoCommit" setting should be overridden.

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getAutoCommitValue

protected Boolean getAutoCommitValue()

Return whether the returned Connection's "autoCommit" setting should be overridden.

Returns:

the "autoCommit" value, or null if none to be applied

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getConnection

public Connection getConnection()
                         throws SQLException

Description copied from class: DriverManagerDataSource

This implementation delegates to getConnectionFromDriverManager, using the default username and password of this DataSource.

Specified by:

getConnection in interface DataSource

Overrides:

getConnection in class DriverManagerDataSource

Throws:

SQLException

See Also:

DriverManagerDataSource.getConnectionFromDriverManager()

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getConnection

public Connection getConnection(String username,
                                String password)
                         throws SQLException

Specifying a custom username and password doesn't make sense with a single Connection. Returns the single Connection if given the same username and password; throws a SQLException else.

Specified by:

getConnection in interface DataSource

Overrides:

getConnection in class DriverManagerDataSource

Throws:

SQLException

See Also:

DriverManagerDataSource.getConnectionFromDriverManager(String, String)

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shouldClose

public boolean shouldClose(Connection con)

This is a single Connection: Do not close it when returning to the "pool".

Specified by:

shouldClose in interface SmartDataSource

Parameters:

con - the Connection to check

Returns:

whether the given Connection should be closed

See Also:

Connection.close()

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destroy

public void destroy()

Close the underlying Connection. The provider of this DataSource needs to care for proper shutdown.

As this bean implements DisposableBean, a bean factory will automatically invoke this on destruction of its cached singletons.

Specified by:

destroy in interface DisposableBean

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initConnection

public void initConnection()
                    throws SQLException

Initialize the underlying Connection via the DriverManager.

Throws:

SQLException

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resetConnection

public void resetConnection()

Reset the underlying shared Connection, to be reinitialized on next access.

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prepareConnection

protected void prepareConnection(Connection con)
                          throws SQLException

Prepare the given Connection before it is exposed.

The default implementation applies the auto-commit flag, if necessary. Can be overridden in subclasses.

Parameters:

con - the Connection to prepare

Throws:

SQLException

See Also:

setAutoCommit(boolean)

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getCloseSuppressingConnectionProxy

protected Connection getCloseSuppressingConnectionProxy(Connection target)

Wrap the given Connection with a proxy that delegates every method call to it but suppresses close calls.

Parameters:

target - the original Connection to wrap

Returns:

the wrapped Connection

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