PHP Dokumentation: Mysqli rollback
12. Januar 2010 von werner
mysqli::rollback
mysqli_rollback
(PHP 5)
mysqli::rollback — mysqli_rollback — Rolls back current transaction
Beschreibung
Object oriented style (method):
bool mysqli::rollback ( void )
Procedural style:
Rollbacks the current transaction for the database.
Parameter-Liste
- link
Nur bei prozeduralem Aufruf: Ein vonmysqli_connect() oder mysqli_init()zurückgegebenes Verbindungsobjekt.
Rückgabewerte
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiele
Beispiel #1 Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}/* disable autocommit */
$mysqli->autocommit(FALSE);$mysqli->query("CREATE TABLE myCity LIKE City");
$mysqli->query("ALTER TABLE myCity Type=InnoDB");
$mysqli->query("INSERT INTO myCity SELECT * FROM City LIMIT 50");/* commit insert */
$mysqli->commit();/* delete all rows */
$mysqli->query("DELETE FROM myCity");if (
$result = $mysqli->query("SELECT COUNT(*) FROM myCity")) {
$row = $result->fetch_row();
printf("%d rows in table myCity.\n", $row[0]);
/* Free result */
$result->close();
}/* Rollback */
$mysqli->rollback();if (
$result = $mysqli->query("SELECT COUNT(*) FROM myCity")) {
$row = $result->fetch_row();
printf("%d rows in table myCity (after rollback).\n", $row[0]);
/* Free result */
$result->close();
}/* Drop table myCity */
$mysqli->query("DROP TABLE myCity");$mysqli->close();
?>Beispiel #2 Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}/* disable autocommit */
mysqli_autocommit($link, FALSE);mysqli_query($link, "CREATE TABLE myCity LIKE City");
mysqli_query($link, "ALTER TABLE myCity Type=InnoDB");
mysqli_query($link, "INSERT INTO myCity SELECT * FROM City LIMIT 50");/* commit insert */
mysqli_commit($link);/* delete all rows */
mysqli_query($link, "DELETE FROM myCity");if (
$result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {
$row = mysqli_fetch_row($result);
printf("%d rows in table myCity.\n", $row[0]);
/* Free result */
mysqli_free_result($result);
}/* Rollback */
mysqli_rollback($link);if (
$result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {
$row = mysqli_fetch_row($result);
printf("%d rows in table myCity (after rollback).\n", $row[0]);
/* Free result */
mysqli_free_result($result);
}/* Drop table myCity */
mysqli_query($link, "DROP TABLE myCity");mysqli_close($link);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
0 rows in table myCity.50 rows in table myCity (after rollback).
Siehe auch
- mysqli_commit() – Commits the current transaction
- mysqli_autocommit() – Turns on or off auto-commiting database modifications
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