org.apache.xalan.lib.sql

## Class DefaultConnectionPool

- java.lang.Object
- - org.apache.xalan.lib.sql.DefaultConnectionPool

- All Implemented Interfaces:
    ConnectionPool

      public class DefaultConnectionPool
      extends java.lang.Object
      implements ConnectionPool

  For internal connectiones, i.e. Connection information supplies in the Stylesheet. The Default Connection Pool will be used.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultConnectionPool()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `freeUnused()` Go through the connection pool and release any connections that are not InUse;
    `java.sql.Connection` | `getConnection()` Retrive a database connection from the pool
    `boolean` | `hasActiveConnections()` Is our ConnectionPool have any connections that are still in Use ??
    `void` | `initializePool()`
    `boolean` | `isEnabled()` Return our current Active state
    `void` | `releaseConnection(java.sql.Connection con)` Return a connection to the pool, the connection may be closed if the pool is inactive or has exceeded the max number of free connections
    `void` | `releaseConnectionOnError(java.sql.Connection con)` Provide a mechinism to return a connection to the pool on Error.
    `void` | `setDriver(java.lang.String d)` Set the driver call to be used to create connections
    `void` | `setMinConnections(int n)` Override the current number of connections to keep in the pool.
    `void` | `setPassword(java.lang.String p)` Set the password in the property set.
    `void` | `setPoolEnabled(boolean flag)` The Pool can be Enabled and Disabled.
    `void` | `setProtocol(java.util.Properties p)` The Protocol string is used to pass in other connection properties.
    `void` | `setURL(java.lang.String url)` Set the url used to connect to the database
    `void` | `setUser(java.lang.String u)` Set the user name in the property set
    `boolean` | `testConnection()` Try to aquire a new connection, if it succeeds then return true, else return false.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### DefaultConnectionPool

          public DefaultConnectionPool()

  - ### Method Detail

    - #### isEnabled

          public boolean isEnabled()

      Return our current Active state
      Specified by:
        `isEnabled` in interface `ConnectionPool`

    - #### setDriver

          public void setDriver(java.lang.String d)

      Set the driver call to be used to create connections
      Specified by:
        `setDriver` in interface `ConnectionPool`
      Parameters:
        `d` -

    - #### setURL

          public void setURL(java.lang.String url)

      Set the url used to connect to the database
      Specified by:
        `setURL` in interface `ConnectionPool`
      Parameters:
        `url` -

    - #### freeUnused

          public void freeUnused()

      Go through the connection pool and release any connections that are not InUse;
      Specified by:
        `freeUnused` in interface `ConnectionPool`

    - #### hasActiveConnections

          public boolean hasActiveConnections()

      Is our ConnectionPool have any connections that are still in Use ??
      Specified by:
        `hasActiveConnections` in interface `ConnectionPool`

    - #### setPassword

          public void setPassword(java.lang.String p)

      Set the password in the property set.
      Specified by:
        `setPassword` in interface `ConnectionPool`
      Parameters:
        `p` -

    - #### setUser

          public void setUser(java.lang.String u)

      Set the user name in the property set
      Specified by:
        `setUser` in interface `ConnectionPool`
      Parameters:
        `u` -

    - #### setProtocol

          public void setProtocol(java.util.Properties p)

      The Protocol string is used to pass in other connection properties. A properties file is a general purpose container
      Specified by:
        `setProtocol` in interface `ConnectionPool`
      Parameters:
        `p` -

    - #### setMinConnections

          public void setMinConnections(int n)

      Override the current number of connections to keep in the pool. This setting will only have effect on a new pool or when a new connection is requested and there is less connections that this setting.
      Specified by:
        `setMinConnections` in interface `ConnectionPool`
      Parameters:
        `n` -

    - #### testConnection

          public boolean testConnection()

      Try to aquire a new connection, if it succeeds then return true, else return false. Note: This method will cause the connection pool to be built.
      Specified by:
        `testConnection` in interface `ConnectionPool`

    - #### getConnection

          public java.sql.Connection getConnection()
                                            throws java.lang.IllegalArgumentException,
                                                   java.sql.SQLException

      Description copied from interface: `ConnectionPool`
      Retrive a database connection from the pool
      Specified by:
        `getConnection` in interface `ConnectionPool`
      Returns:
        Connection
      Throws:
        `java.sql.SQLException`
        `java.lang.IllegalArgumentException`

    - #### releaseConnection

          public void releaseConnection(java.sql.Connection con)
                                 throws java.sql.SQLException

      Description copied from interface: `ConnectionPool`
      Return a connection to the pool, the connection may be closed if the pool is inactive or has exceeded the max number of free connections
      Specified by:
        `releaseConnection` in interface `ConnectionPool`
      Parameters:
        `con` -
      Throws:
        `java.sql.SQLException`

    - #### releaseConnectionOnError

          public void releaseConnectionOnError(java.sql.Connection con)
                                        throws java.sql.SQLException

      Description copied from interface: `ConnectionPool`
      Provide a mechinism to return a connection to the pool on Error. A good default behaviour is to close this connection and build a new one to replace it. Some JDBC impl's won't allow you to reuse a connection after an error occurs.
      Specified by:
        `releaseConnectionOnError` in interface `ConnectionPool`
      Parameters:
        `con` -
      Throws:
        `java.sql.SQLException`

    - #### initializePool

          public void initializePool()
                              throws java.lang.IllegalArgumentException,
                                     java.sql.SQLException

      Throws:
        `java.lang.IllegalArgumentException`
        `java.sql.SQLException`

    - #### setPoolEnabled

          public void setPoolEnabled(boolean flag)

      The Pool can be Enabled and Disabled. Disabling the pool closes all the outstanding Unused connections and any new connections will be closed upon release.
      Specified by:
        `setPoolEnabled` in interface `ConnectionPool`
      Parameters:
        `flag` - Control the Connection Pool. If it is enabled then Connections will actuall be held around. If disabled then all unused connections will be instantly closed and as connections are released they are closed and removed from the pool.

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