UserCredentialsDataSourceAdapter (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.jdbc.datasource
Class UserCredentialsDataSourceAdapter

java.lang.Object
  org.springframework.jdbc.datasource.DelegatingDataSource
      org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter

All Implemented Interfaces:: DataSource, InitializingBean

public class UserCredentialsDataSourceAdapter
extends DelegatingDataSource
extends DelegatingDataSource

An adapter for a target DataSource, applying the given user credentials to every standard getConnection() call, that is, implicitly invoking getConnection(username, password) on the target. All other methods simply delegate to the corresponding methods of the target DataSource.

Can be used to proxy a target JNDI DataSource that does not have user credentials configured. Client code can work with the DataSource without passing in username and password on every getConnection() call.

In the following example, client code can simply transparently work with the preconfigured "myDataSource", implicitly accessing "myTargetDataSource" with the specified user credentials.

 <bean id="myTargetDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
   <property name="jndiName"><value>java:comp/env/jdbc/myds</value></property>
 </bean>

 <bean id="myDataSource" class="org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter">
   <property name="targetDataSource"><ref bean="myTargetDataSource"/></property>
   <property name="username"><value>myusername</value></property>
   <property name="password"><value>mypassword</value></property>
 </bean>

If the "username" is empty, this proxy will simply delegate to the standard getConnection() method of the target DataSource. This can be used to keep a UserCredentialsDataSourceAdapter bean definition just for the option of implicitly passing in user credentials if a particular target DataSource requires it.

Since:: 1.0.2
Author:: Juergen Hoeller
See Also:: getConnection()

Constructor Summary

UserCredentialsDataSourceAdapter()


Method Summary

protected Connection doGetConnection(String username, String password)
          This implementation delegates to the getConnection(username, password) method of the target DataSource, passing in the specified user credentials.

Connection getConnection()
          Determine whether there are currently thread-bound credentials, using them if available, falling back to the statically specified username and password (i.e. values of the bean properties) else.

void removeCredentialsFromCurrentThread()
          Remove any user credentials for this proxy from the current thread.

void setCredentialsForCurrentThread(String username, String password)
          Set user credententials for this proxy and the current thread.

void setPassword(String password)
          Set the password that this adapter should use for retrieving Connections.

void setUsername(String username)
          Set the username that this adapter should use for retrieving Connections.

Methods inherited from class org.springframework.jdbc.datasource.DelegatingDataSource

afterPropertiesSet, getConnection, getLoginTimeout, getLogWriter, getTargetDataSource, setLoginTimeout, setLogWriter, setTargetDataSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Summary
`UserCredentialsDataSourceAdapter()`

Method Summary
`protected Connection`	`doGetConnection(String username, String password)` This implementation delegates to the `getConnection(username, password)` method of the target DataSource, passing in the specified user credentials.
`Connection`	`getConnection()` Determine whether there are currently thread-bound credentials, using them if available, falling back to the statically specified username and password (i.e. values of the bean properties) else.
`void`	`removeCredentialsFromCurrentThread()` Remove any user credentials for this proxy from the current thread.
`void`	`setCredentialsForCurrentThread(String username, String password)` Set user credententials for this proxy and the current thread.
`void`	`setPassword(String password)` Set the password that this adapter should use for retrieving Connections.
`void`	`setUsername(String username)` Set the username that this adapter should use for retrieving Connections.

Methods inherited from class org.springframework.jdbc.datasource.DelegatingDataSource
`afterPropertiesSet, getConnection, getLoginTimeout, getLogWriter, getTargetDataSource, setLoginTimeout, setLogWriter, setTargetDataSource`

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

Constructor Detail

UserCredentialsDataSourceAdapter

public UserCredentialsDataSourceAdapter()

Method Detail

setUsername

public void setUsername(String username)

Set the username that this adapter should use for retrieving Connections. Default is the empty string, i.e. no specific user.

setPassword

public void setPassword(String password)

Set the password that this adapter should use for retrieving Connections. Default is the empty string, i.e. no specific password.

setCredentialsForCurrentThread

public void setCredentialsForCurrentThread(String username,
                                           String password)

Set user credententials for this proxy and the current thread. The given username and password will be applied to all subsequent getConnection() calls on this DataSource proxy.

This will override any statically specified user credentials, that is, values of the "username" and "password" bean properties.

Parameters:: username - the username to apply; password - the password to apply
See Also:: removeCredentialsFromCurrentThread()

removeCredentialsFromCurrentThread

public void removeCredentialsFromCurrentThread()

Remove any user credentials for this proxy from the current thread. Statically specified user credentials apply again afterwards.

See Also:: setCredentialsForCurrentThread(java.lang.String, java.lang.String)

getConnection

public final Connection getConnection()
                               throws SQLException

Determine whether there are currently thread-bound credentials, using them if available, falling back to the statically specified username and password (i.e. values of the bean properties) else.

Specified by:: getConnection in interface DataSource
Overrides:: getConnection in class DelegatingDataSource

Throws:: SQLException
See Also:: doGetConnection(java.lang.String, java.lang.String)

doGetConnection

protected Connection doGetConnection(String username,
                                     String password)
                              throws SQLException

This implementation delegates to the getConnection(username, password) method of the target DataSource, passing in the specified user credentials. If the specified username is empty, it will simply delegate to the standard getConnection() method of the target DataSource.

Parameters:: username - the username to use; password - the password to use
Returns:: the Connection
Throws:: SQLException
See Also:: DataSource.getConnection(String, String), DataSource.getConnection()