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## org.springframework.jdbc.datasource
Class SingleConnectionDataSource

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

All Implemented Interfaces:
  Wrapper, CommonDataSource, DataSource, DisposableBean, SmartDataSource

    public class SingleConnectionDataSource

extends DriverManagerDataSource
implements SmartDataSource, DisposableBean

Implementation of `SmartDataSource` that wraps a single JDBC 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` 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`

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)` Deprecated. since Spring 2.5. Driver parameter usage is generally not recommended for a SingleConnectionDataSource. If you insist on using driver parameters directly, set up the Driver class manually before invoking this DataSource.

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 `getConnectionFromDriver`, 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
`getConnectionFromDriver, getConnectionFromDriverManager, setDriverClassName`

Methods inherited from class org.springframework.jdbc.datasource.AbstractDriverBasedDataSource
`getConnectionFromDriver, getConnectionProperties, getPassword, getUrl, getUsername, setConnectionProperties, setPassword, setUrl, setUsername`

Methods inherited from class org.springframework.jdbc.datasource.AbstractDataSource
`getLoginTimeout, getLogWriter, getParentLogger, 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.

### SingleConnectionDataSource

    @Deprecated
    public SingleConnectionDataSource(String driverClassName,
                                                 String url,
                                                 String username,
                                                 String password,
                                                 boolean suppressClose)

  Deprecated. since Spring 2.5. Driver parameter usage is generally not recommended for a SingleConnectionDataSource. If you insist on using driver parameters directly, set up the Driver class manually before invoking this DataSource.

  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
  See Also:
    `DriverManager.getConnection(String, String, String)`

### SingleConnectionDataSource

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

  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
  See Also:
    `DriverManager.getConnection(String, String, String)`

### SingleConnectionDataSource

    public SingleConnectionDataSource(String url,
                                      boolean suppressClose)

  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
  See Also:
    `DriverManager.getConnection(String, String, String)`

### 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.

### isSuppressClose

    protected boolean isSuppressClose()

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

### setAutoCommit

    public void setAutoCommit(boolean autoCommit)

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

### 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

### getConnection

    public Connection getConnection()
                             throws SQLException

  Description copied from class: `AbstractDriverBasedDataSource`
  This implementation delegates to `getConnectionFromDriver`, using the default username and password of this DataSource.

  Specified by:
    `getConnection` in interface `DataSource`
  Overrides:
    `getConnection` in class `AbstractDriverBasedDataSource`
  Throws:
    `SQLException`
  See Also:
    `AbstractDriverBasedDataSource.getConnectionFromDriver(String, String)`, `AbstractDriverBasedDataSource.setUsername(java.lang.String)`, `AbstractDriverBasedDataSource.setPassword(java.lang.String)`

### 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 `AbstractDriverBasedDataSource`
  Throws:
    `SQLException`
  See Also:
    `AbstractDriverBasedDataSource.getConnectionFromDriver(String, String)`

### 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()`

### 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`

### initConnection

    public void initConnection()
                        throws SQLException

  Initialize the underlying Connection via the DriverManager.

  Throws:
    `SQLException`

### resetConnection

    public void resetConnection()

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

### 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)`

### 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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