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## net.sourceforge.jtds.jdbc
Class XASupport

    java.lang.Object
      |
      +--net.sourceforge.jtds.jdbc.XASupport

public class XASupport
extends java.lang.Object

This class contains static utility methods used to implement distributed transactions. For SQL Server 2000 the driver can provide true distributed transactions provided that the external stored procedure in JtdsXA.dll is installed. For other types of server only an emulation is available at this stage.

Field Summary
`private static java.lang.String` | `TM_ID` xa_open login string unique to jTDS.
`private static int` | `XA_CLOSE`
`private static int` | `XA_COMMIT`
`private static int` | `XA_COMPLETE`
`private static int` | `XA_END`
`private static int` | `XA_FORGET`
`private static int` | `XA_OPEN`
`private static int` | `XA_PREPARE`
`private static int` | `XA_RECOVER`
`private static int` | `XA_RMID` The Resource Manager ID allocated by jTDS
`private static int` | `XA_ROLLBACK`
`private static int` | `XA_START`
`private static int` | `XA_TRACE` Set this field to 1 to enable XA tracing.

Constructor Summary
`private` | `XASupport()`

Method Summary
`static void` | `raiseXAException(int errorCode)` Construct and throw an `XAException` with an explanatory message and the XA error code set.
`static void` | `raiseXAException(java.sql.SQLException sqle)` Construct and throw an `XAException` with an explanatory message derived from the `SQLException` and the XA error code set to `XAER_RMFAIL`.
`private static byte[]` | `toBytesXid(javax.transaction.xa.Xid xid)` Format an XA transaction ID into a 140 byte array.
`static void` | `xa_close(java.sql.Connection connection, int xaConId)` Invoke the xa_close routine on the SQL Server.
`static void` | `xa_commit(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid, boolean onePhase)` Invoke the xa_commit routine on the SQL Server.
`static void` | `xa_end(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid, int flags)` Invoke the xa_end routine on the SQL Server.
`static void` | `xa_forget(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid)` Invoke the xa_forget routine on the SQL Server.
`static int` | `xa_open(java.sql.Connection connection)` Invoke the xa_open routine on the SQL Server.
`static int` | `xa_prepare(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid)` Invoke the xa_prepare routine on the SQL Server.
`static javax.transaction.xa.Xid[]` | `xa_recover(java.sql.Connection connection, int xaConId, int flags)` Invoke the xa_recover routine on the SQL Server.
`static void` | `xa_rollback(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid)` Invoke the xa_rollback routine on the SQL Server.
`static void` | `xa_start(java.sql.Connection connection, int xaConId, javax.transaction.xa.Xid xid, int flags)` Invoke the xa_start routine on the SQL Server.

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

Field Detail

### XA_RMID

    private static final int XA_RMID

  The Resource Manager ID allocated by jTDS

### TM_ID

    private static final java.lang.String TM_ID

  xa_open login string unique to jTDS.

### XA_OPEN

    private static final int XA_OPEN

### XA_CLOSE

    private static final int XA_CLOSE

### XA_START

    private static final int XA_START

### XA_END

    private static final int XA_END

### XA_ROLLBACK

    private static final int XA_ROLLBACK

### XA_PREPARE

    private static final int XA_PREPARE

### XA_COMMIT

    private static final int XA_COMMIT

### XA_RECOVER

    private static final int XA_RECOVER

### XA_FORGET

    private static final int XA_FORGET

### XA_COMPLETE

    private static final int XA_COMPLETE

### XA_TRACE

    private static final int XA_TRACE

  Set this field to 1 to enable XA tracing.

Constructor Detail

### XASupport

    private XASupport()

Method Detail

### xa_open

    public static int xa_open(java.sql.Connection connection)
                       throws java.sql.SQLException

  Invoke the xa_open routine on the SQL Server.
  Parameters:
    `connection` - the parent XAConnection object
  Returns:
    the XA connection ID allocated by xp_jtdsxa

### xa_close

    public static void xa_close(java.sql.Connection connection,
                                int xaConId)
                         throws java.sql.SQLException

  Invoke the xa_close routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection to be enlisted in the transaction
    `xaConId` - the connection ID allocated by the server

### xa_start

    public static void xa_start(java.sql.Connection connection,
                                int xaConId,
                                javax.transaction.xa.Xid xid,
                                int flags)
                         throws javax.transaction.xa.XAException

  Invoke the xa_start routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection to be enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `xid` - the XA Transaction ID object
    `flags` - XA Flags for start command
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_end

    public static void xa_end(java.sql.Connection connection,
                              int xaConId,
                              javax.transaction.xa.Xid xid,
                              int flags)
                       throws javax.transaction.xa.XAException

  Invoke the xa_end routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `xid` - the XA Transaction ID object
    `flags` - XA Flags for start command
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_prepare

    public static int xa_prepare(java.sql.Connection connection,
                                 int xaConId,
                                 javax.transaction.xa.Xid xid)
                          throws javax.transaction.xa.XAException

  Invoke the xa_prepare routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction.
    `xaConId` - The connection ID allocated by the server.
    `xid` - The XA Transaction ID object.
  Returns:
    prepare status (XA_OK or XA_RDONLY) as an `int`.
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_commit

    public static void xa_commit(java.sql.Connection connection,
                                 int xaConId,
                                 javax.transaction.xa.Xid xid,
                                 boolean onePhase)
                          throws javax.transaction.xa.XAException

  Invoke the xa_commit routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `xid` - the XA Transaction ID object
    `onePhase` - `true` if single phase commit required
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_rollback

    public static void xa_rollback(java.sql.Connection connection,
                                   int xaConId,
                                   javax.transaction.xa.Xid xid)
                            throws javax.transaction.xa.XAException

  Invoke the xa_rollback routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `xid` - the XA Transaction ID object
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_recover

    public static javax.transaction.xa.Xid[] xa_recover(java.sql.Connection connection,
                                                        int xaConId,
                                                        int flags)
                                                 throws javax.transaction.xa.XAException

  Invoke the xa_recover routine on the SQL Server.

  This version of xa_recover will return all XIDs on the first call.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `flags` - XA Flags for start command
  Returns:
    transactions to recover as a `Xid[]`
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### xa_forget

    public static void xa_forget(java.sql.Connection connection,
                                 int xaConId,
                                 javax.transaction.xa.Xid xid)
                          throws javax.transaction.xa.XAException

  Invoke the xa_forget routine on the SQL Server.
  Parameters:
    `connection` - JDBC Connection enlisted in the transaction
    `xaConId` - the connection ID allocated by the server
    `xid` - the XA Transaction ID object
  Throws:
    `javax.transaction.xa.XAException` - if an error condition occurs

### raiseXAException

    public static void raiseXAException(java.sql.SQLException sqle)
                                 throws javax.transaction.xa.XAException

  Construct and throw an `XAException` with an explanatory message derived from the `SQLException` and the XA error code set to `XAER_RMFAIL`.
  Parameters:
    `sqle` - The SQLException.
  Throws:
    `javax.transaction.xa.XAException` - exception derived from the code>SQLException

### raiseXAException

    public static void raiseXAException(int errorCode)
                                 throws javax.transaction.xa.XAException

  Construct and throw an `XAException` with an explanatory message and the XA error code set.
  Parameters:
    `errorCode` - the XA Error code
  Throws:
    `javax.transaction.xa.XAException` - the constructed exception

### toBytesXid

    private static byte[] toBytesXid(javax.transaction.xa.Xid xid)

  Format an XA transaction ID into a 140 byte array.
  Parameters:
    `xid` - the XA transaction ID
  Returns:
    the formatted ID as a `byte[]`

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Generated on November 8 2005