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# maxdb_rollback

# maxdb->rollback

(PECL maxdb:1.0-7.6.00.38)

maxdb_rollback -- maxdb->rollback — Rolls back current transaction

### Beschreibung

bool maxdb_rollback ( resource `$link` )
maxdb
bool rollback ( void )

Rollbacks the current transaction for the database specified by the `link` parameter.

### Rückgabewerte

Gibt bei Erfolg `TRUE` zurück, im Fehlerfall `FALSE`.

### Beispiele

Beispiel #1 Object oriented style

`<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* disable autocommit */
$maxdb->autocommit(FALSE);
$maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city");
$maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city");
/* commit insert */
$maxdb->commit();
/* delete all rows */
$maxdb->query("DELETE FROM temp.mycity");
if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
$row = $result->fetch_row();
printf("%d rows in table mycity.\n", $row[0]);
/* Free result */
$result->close();
}
/* Rollback */
$maxdb->rollback();
if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
$row = $result->fetch_row();
printf("%d rows in table mycity (after rollback).\n", $row[0]);
/* Free result */
$result->close();
}
/* Drop table myCity */
$maxdb->query("DROP TABLE temp.mycity");
$maxdb->close();
?>`

Beispiel #2 Procedural style

`<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* disable autocommit */
maxdb_autocommit($link, FALSE);
maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city");
maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city");
/* commit insert */
maxdb_commit($link);
/* delete all rows */
maxdb_query($link, "DELETE FROM temp.mycity");
if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
$row = maxdb_fetch_row($result);
printf("%d rows in table mycity.\n", $row[0]);
/* Free result */
maxdb_free_result($result);
}
/* Rollback */
maxdb_rollback($link);
if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
$row = maxdb_fetch_row($result);
printf("%d rows in table mycity (after rollback).\n", $row[0]);
/* Free result */
maxdb_free_result($result);
}
/* Drop table myCity */
maxdb_query($link, "DROP TABLE temp.mycity");
maxdb_close($link);
?>`

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    0 rows in table mycity.
    25 rows in table mycity (after rollback).

### Siehe auch

- maxdb_commit()
- maxdb_autocommit()

maxdb_report
maxdb_rpl_parse_enabled
MaxDB Funktionen
PHP Manual