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

Fields

Modifier and Type	Field and Description
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

Constructors

Modifier	Constructor and Description
private	XASupport()

Method Summary

Methods

Modifier and Type	Method and Description
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, toString, wait, wait, wait

Field Detail

XA_RMID

private static final int XA_RMID

The Resource Manager ID allocated by jTDS

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Constant Field Values

TM_ID

private static final java.lang.String TM_ID

xa_open login string unique to jTDS.

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Constant Field Values

XA_OPEN

private static final int XA_OPEN

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Constant Field Values

XA_CLOSE

private static final int XA_CLOSE

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Constant Field Values

XA_START

private static final int XA_START

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Constant Field Values

XA_END

private static final int XA_END

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Constant Field Values

XA_ROLLBACK

private static final int XA_ROLLBACK

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Constant Field Values

XA_PREPARE

private static final int XA_PREPARE

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Constant Field Values

XA_COMMIT

private static final int XA_COMMIT

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Constant Field Values

XA_RECOVER

private static final int XA_RECOVER

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Constant Field Values

XA_FORGET

private static final int XA_FORGET

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Constant Field Values

XA_COMPLETE

private static final int XA_COMPLETE

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Constant Field Values

XA_TRACE

private static final int XA_TRACE

Set this field to 1 to enable XA tracing.

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Constant Field Values

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

Throws:

java.sql.SQLException

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

Throws:

java.sql.SQLException

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[]