DB2_ROLLBACK(3) 							 1							   DB2_ROLLBACK(3)

db2_rollback - Rolls back a transaction

SYNOPSIS

       bool db2_rollback (resource  $connection)

DESCRIPTION

	Rolls back an in-progress transaction on the specified connection resource and begins a new transaction. PHP applications normally default
       to AUTOCOMMIT mode, so db2_rollback(3) normally has no effect unless AUTOCOMMIT has been turned off for the connection resource.

PARAMETERS

	      o $connection
		- A valid database connection resource variable as returned from db2_connect(3) or db2_pconnect(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Rolling back a DELETE statement

	       In the following example, we count the number of rows in a table, turn off AUTOCOMMIT mode on a database connection, delete all	of
	      the  rows  in the table and return the count of 0 to prove that the rows have been removed. We then issue db2_rollback(3) and return
	      the updated count of rows in the table to show that the number is the same as before we issued the DELETE statement. The	return	to
	      the original state of the table demonstrates that the roll back of the transaction succeeded.

	      <?php
	      $conn = db2_connect($database, $user, $password);

	      if ($conn) {
		  $stmt = db2_exec($conn, "SELECT count(*) FROM animals");
		  $res = db2_fetch_array( $stmt );
		  echo $res[0] . "
";

		  // Turn AUTOCOMMIT off
		  db2_autocommit($conn, DB2_AUTOCOMMIT_OFF);

		  // Delete all rows from ANIMALS
		  db2_exec($conn, "DELETE FROM animals");

		  $stmt = db2_exec($conn, "SELECT count(*) FROM animals");
		  $res = db2_fetch_array( $stmt );
		  echo $res[0] . "
";

		  // Roll back the DELETE statement
		  db2_rollback( $conn );

		  $stmt = db2_exec( $conn, "SELECT count(*) FROM animals" );
		  $res = db2_fetch_array( $stmt );
		  echo $res[0] . "
";
		  db2_close($conn);
	      }
	      ?>

	      The above example will output:

	      7
	      0
	      7

SEE ALSO

       db2_autocommit(3), db2_commit(3).

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