mysqli::close
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!
mysqli::commit
mysqli_commit
(PHP 5)
mysqli::commit -- mysqli_commit — Valide la transaction courante
Description
Style orienté objet
bool mysqli::commit
( void
)
Style procédural
Valide la transaction courante pour la base de données
spécifiée par le paramètre link.
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 ou FALSE si une erreur survient.
Exemples
Exemple #1 Exemple avec mysqli::commit()
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();
}
$mysqli->query("CREATE TABLE Language LIKE CountryLanguage");
/* Désactivation de l'autocommit */
$mysqli->autocommit(FALSE);
/* Insertion de quelques valeurs */
$mysqli->query("INSERT INTO Language VALUES ('DEU', 'Bavarian', 'F', 11.2)");
$mysqli->query("INSERT INTO Language VALUES ('DEU', 'Swabian', 'F', 9.4)");
/* Validation de la transaction */
$mysqli->commit();
/* Effacement de la table */
$mysqli->query("DROP TABLE Language");
/* Fermeture de la connexion */
$mysqli->close();
?>
Style procédural
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* Vérification de la connexion */
if (!$link) {
printf("Échec de la connexion : %s\n", mysqli_connect_error());
exit();
}
/* Désactivation de l'autocommit */
mysqli_autocommit($link, FALSE);
mysqli_query($link, "CREATE TABLE Language LIKE CountryLanguage");
/* Insertion de quelques valeurs */
mysqli_query($link, "INSERT INTO Language VALUES ('DEU', 'Bavarian', 'F', 11.2)");
mysqli_query($link, "INSERT INTO Language VALUES ('DEU', 'Swabian', 'F', 9.4)");
/* Validation de la transaction */
mysqli_commit($link);
/* Fermeture de la connexion */
mysqli_close($link);
?>
Voir aussi
- mysqli_autocommit() - Active ou désactive le mode auto-commit
- mysqli_rollback() - Annule la transaction courante
add a note
User Contributed Notes
mysqli::commit - [3 notes]
Lorenzo - webmaster AT 4tour DOT it ¶
4 years ago
Bob Johnson ¶
3 years ago
The compactness of Lorenzo's code is admirable.
However, it is a good idea to also check $mysqli->affected_rows to make sure that the INSERT statement did not fail.
<?php
$result_query = @mysqli_query($query, $connect);
if (($result_query == false) &&
(mysqli_affected_rows($connect) == 0))
{
// verify the query executed completely and verify that it
// had impact on the table
$success = false;
// here also, the developer could choose to add a ROLLBACK
// statement
}
?>