For PHP<5.5:
mysqli_query($db, "START TRANSACTION");
mysqli::begin_transaction
mysqli_begin_transaction
(PHP 5 >= 5.5.0, PHP 7)
mysqli::begin_transaction -- mysqli_begin_transaction — Starts a transaction
Descrizione
Stile orientato agli oggetti (method):
public bool mysqli::begin_transaction
([ int
$flags
[, string $name
]] )Stile procedurale:
Begins a transaction. Requires the InnoDB engine (it is enabled by default). For additional details about how MySQL transactions work, see » http://dev.mysql.com/doc/mysql/en/commit.html.
Elenco dei parametri
-
link -
Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()
-
flags -
Valid flags are:
-
MYSQLI_TRANS_START_READ_ONLY: Start the transaction as "START TRANSACTION READ ONLY". Requires MySQL 5.6 and above. -
MYSQLI_TRANS_START_READ_WRITE: Start the transaction as "START TRANSACTION READ WRITE". Requires MySQL 5.6 and above. -
MYSQLI_TRANS_START_WITH_CONSISTENT_SNAPSHOT: Start the transaction as "START TRANSACTION WITH CONSISTENT SNAPSHOT".
-
-
name -
Savepoint name for the transaction.
Valori restituiti
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Esempi
Example #1 $mysqli->begin_transaction() example
Stile orientato agli oggetti
<?php
$mysqli = new mysqli("127.0.0.1", "my_user", "my_password", "sakila");
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
$mysqli->begin_transaction(MYSQLI_TRANS_START_READ_ONLY);
$mysqli->query("SELECT first_name, last_name FROM actor");
$mysqli->commit();
$mysqli->close();
?>
Stile procedurale
<?php
$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "sakila");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_begin_transaction($link, MYSQLI_TRANS_START_READ_ONLY);
mysqli_query($link, "SELECT first_name, last_name FROM actor LIMIT 1");
mysqli_commit($link);
mysqli_close($link);
?>
Vedere anche:
- mysqli_autocommit() - Turns on or off auto-committing database modifications
- mysqli_commit() - Commits the current transaction
- mysqli_rollback() - Rolls back current transaction
add a note
User Contributed Notes 2 notes
Ral ¶
25 days ago
If you receive errors like: "This server version doesn't support 'READ WRITE' and 'READ ONLY'. Minimum 5.6.5 is required" with versions of MariaDB that DO support them, this is due to an internal check in mysqli conflicting with a hack in MariaDB to allow replication with oracle mysql.
MariaDB prefixes its server version numbers with "5.5.5-" for example "5.5.5-10.3.7-MariaDB-1:10.3.7+maria~stretch". This is because oracle mysql would interpet the "10" as version 1. Mysql clients aware of MariaDB have been updated to detect and strip this prefix.
However the check for mysqli.begin-transaction sees the 5.5.5 prefix and so fails.
The workaround is to specify a custom version string without the prefix for MariaDB on the command line using the --version option. Then mysqli.begin-transaction functions as expected.
