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UserCredentialsDataSourceAdapter (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 UserCredentialsDataSourceAdapter

java.lang.Object
  extended by org.springframework.jdbc.datasource.DelegatingDataSource
      extended by org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter
All Implemented Interfaces:
Wrapper, CommonDataSource, DataSource, InitializingBean
Direct Known Subclasses:
IsolationLevelDataSourceAdapter
public class UserCredentialsDataSourceAdapter
extends DelegatingDataSource

An adapter for a target JDBC DataSource, applying the specified user credentials to every standard getConnection() call, 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 this DataSource as usual, using the standard 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"/>
 </bean>

 <bean id="myDataSource" class="org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter">
   <property name="targetDataSource" ref="myTargetDataSource"/>
   <property name="username" value="myusername"/>
   <property name="password" value="mypassword"/>
 </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 the 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.
 Connection getConnection(String username, String password)
          Simply delegates to doGetConnection(String, String), keeping the given user credentials as-is.
 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 default user's password that this adapter should use for retrieving Connections.
 void setUsername(String username)
          Set the default username that this adapter should use for retrieving Connections.
 
Methods inherited from class org.springframework.jdbc.datasource.DelegatingDataSource
afterPropertiesSet, getLoginTimeout, getLogWriter, getTargetDataSource, isWrapperFor, setLoginTimeout, setLogWriter, setTargetDataSource, unwrap
 
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 default username that this adapter should use for retrieving Connections.

Default is no specific user. Note that an explicitly specified username will always override any username/password specified at the DataSource level.

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

setPassword

public void setPassword(String password)
Set the default user's password that this adapter should use for retrieving Connections.

Default is no specific password. Note that an explicitly specified username will always override any username/password specified at the DataSource level.

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

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 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.

Delegates to doGetConnection(String, String) with the determined credentials as parameters.

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

getConnection

public Connection getConnection(String username,
                                String password)
                         throws SQLException
Simply delegates to doGetConnection(String, String), keeping the given user credentials as-is.

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

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()
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