mysqli::reap_async_query
Something to consider when using transact is that you should not perform a normal query on the same table (such as a DELETE) immediately after a transaction. If the transaction rolls-back, the DELETE will execute and even show affected rows, but the row can be magically re-inserted even if the rollback() command comes before the DELETE query.
mysqli::rollback
mysqli_rollback
(PHP 5)
mysqli::rollback -- mysqli_rollback — Annule la transaction courante
Description
Style orienté objet :
bool mysqli::rollback
( void
)
Style procédural :
Annule la transaction courante pour la base de données.
Liste de paramètres
- link
-
Seulement en style procédural : Un identifiant de lien retourné par la fonction mysqli_connect() ou par la fonction mysqli_init()
Valeurs de retour
Cette fonction retourne TRUE en cas de succès, FALSE en cas d'échec.
Exemples
Exemple #1 Style orienté objet
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* Vérification de la connexion */
if (mysqli_connect_errno()) {
printf("Échec de la connexion : %s\n", mysqli_connect_error());
exit();
}
/* Désactive l'auto-commit */
$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");
/* Validation */
$mysqli->commit();
/* Effacement de toutes les lignes */
$mysqli->query("DELETE FROM myCity");
if ($result = $mysqli->query("SELECT COUNT(*) FROM myCity")) {
$row = $result->fetch_row();
printf("%d ligne dans la 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 lignes dans la table myCity (après annulation).\n", $row[0]);
/* Libère le résultat */
$result->close();
}
/* Effacement de la table myCity */
$mysqli->query("DROP TABLE myCity");
$mysqli->close();
?>
Exemple #2 Style procédural
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* Vérification de la connexion */
if (mysqli_connect_errno()) {
printf("Échec de la connexion : %s\n", mysqli_connect_error());
exit();
}
/* Désactive l'auto-commit */
mysqli_autocommit($link, FALSE);
mysqli_query($link, "CREATE TABLE myCity LIKE City");
mysqli_query($link, "ALTER TABLE myCity Type=InnoDB");
mysqli_query($link, "INSERT INTO myCity SELECT * FROM City LIMIT 50");
/* Validation */
mysqli_commit($link);
/* Effacement de toutes les lignes */
mysqli_query($link, "DELETE FROM myCity");
if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {
$row = mysqli_fetch_row($result);
printf("%d ligne dans la table myCity.\n", $row[0]);
/* Libère le résultat */
mysqli_free_result($result);
}
/* Rollback */
mysqli_rollback($link);
if ($result = mysqli_query($link, "SELECT COUNT(*) FROM myCity")) {
$row = mysqli_fetch_row($result);
printf("%d lignes dans la table myCity (après annulation).\n", $row[0]);
/* Free result */
mysqli_free_result($result);
}
/* Effacement de la table myCity */
mysqli_query($link, "DROP TABLE myCity");
mysqli_close($link);
?>
L'exemple ci-dessus va afficher :
0 ligne dans la table myCity. 50 lignes dans la table myCity (après annulation).
Voir aussi
- mysqli_commit() - Valide la transaction courante
- mysqli_autocommit() - Active ou désactive le mode auto-commit
add a note
User Contributed Notesmysqli::rollback
jd at dilltree dot com
22-Jul-2009 11:08
22-Jul-2009 11:08
Lorenzo - webmaster AT 4tour DOT it
10-Feb-2009 02:31
10-Feb-2009 02:31
This is an example to explain the powerful of the rollback and commit functions.
Let's suppose you want to be sure that all queries have to be executed without errors before writing data on the database.
Here's the code:
<?php
$all_query_ok=true; // our control variable
//we make 4 inserts, the last one generates an error
//if at least one query returns an error we change our control variable
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (200)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (300)") ? null : $all_query_ok=false;
$mysqli->query("INSERT INTO myCity (id) VALUES (100)") ? null : $all_query_ok=false; //duplicated PRIMARY KEY VALUE
//now let's test our control variable
$all_query_ok ? $mysqli->commit() : $mysqli->rollback();
$mysqli->close();
?>
hope to be helpful!