The 5th Annual China PHP Conference


(PECL ibm_db2 >= 1.0.0)

db2_rollback Rolls back a transaction


bool db2_rollback ( resource $connection )

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() normally has no effect unless AUTOCOMMIT has been turned off for the connection resource.

Elenco dei parametri


A valid database connection resource variable as returned from db2_connect() or db2_pconnect().

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.


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() 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.


if (
$conn) {
$stmt db2_exec($conn"SELECT count(*) FROM animals");
$res db2_fetch_array$stmt );
$res[0] . "\n";
// Turn AUTOCOMMIT off
// Delete all rows from ANIMALS
db2_exec($conn"DELETE FROM animals");
$stmt db2_exec($conn"SELECT count(*) FROM animals");
$res db2_fetch_array$stmt );
$res[0] . "\n";
// Roll back the DELETE statement
db2_rollback$conn );
$stmt db2_exec$conn"SELECT count(*) FROM animals" );
$res db2_fetch_array$stmt );
$res[0] . "\n";

Il precedente esempio visualizzerĂ :


Vedere anche:

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