mysqli::begin_transaction
mysqli_begin_transaction
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
mysqli::begin_transaction -- mysqli_begin_transaction — トランザクションを開始する
説明
オブジェクト指向型
手続き型:
トランザクションを開始します。InnoDB エンジン (デフォルトで有効になっています) が必要です。 MySQL のトランザクションの詳細な動作は、 » http://dev.mysql.com/doc/mysql/en/commit.html を参照ください。
パラメータ
link手続き型のみ: mysqli_connect() あるいは mysqli_init() が返す mysqliオブジェクト。
flags-
以下のフラグが使えます。
-
MYSQLI_TRANS_START_READ_ONLY: "START TRANSACTION READ ONLY" でトランザクションを開始します。 MySQL 5.6 以上が必要です。 -
MYSQLI_TRANS_START_READ_WRITE: "START TRANSACTION READ WRITE" でトランザクションを開始します。 MySQL 5.6 以上が必要です。 -
MYSQLI_TRANS_START_WITH_CONSISTENT_SNAPSHOT: "START TRANSACTION WITH CONSISTENT SNAPSHOT" でトランザクションを開始します。
-
name-
トランザクションのセーブポイント名。
変更履歴
| バージョン | 説明 |
|---|---|
| 8.0.0 |
name は、nullable になりました。
|
例
例1 mysqli::begin_transaction() の例
オブジェクト指向型
<?php
/* Tell mysqli to throw an exception if an error occurs */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* The table engine has to support transactions */
$mysqli->query("CREATE TABLE IF NOT EXISTS language (
Code text NOT NULL,
Speakers int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
/* Start transaction */
$mysqli->begin_transaction();
try {
/* Insert some values */
$mysqli->query("INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");
/* Try to insert invalid values */
$language_code = 'FR';
$native_speakers = 'Unknown';
$stmt = $mysqli->prepare('INSERT INTO language(Code, Speakers) VALUES (?,?)');
$stmt->bind_param('ss', $language_code, $native_speakers);
$stmt->execute();
/* If code reaches this point without errors then commit the data in the database */
$mysqli->commit();
} catch (mysqli_sql_exception $exception) {
$mysqli->rollback();
throw $exception;
}手続き型
<?php
/* Tell mysqli to throw an exception if an error occurs */
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");
/* The table engine has to support transactions */
mysqli_query($mysqli, "CREATE TABLE IF NOT EXISTS language (
Code text NOT NULL,
Speakers int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
/* Start transaction */
mysqli_begin_transaction($mysqli);
try {
/* Insert some values */
mysqli_query($mysqli, "INSERT INTO language(Code, Speakers) VALUES ('DE', 42000123)");
/* Try to insert invalid values */
$language_code = 'FR';
$native_speakers = 'Unknown';
$stmt = mysqli_prepare($mysqli, 'INSERT INTO language(Code, Speakers) VALUES (?,?)');
mysqli_stmt_bind_param($stmt, 'ss', $language_code, $native_speakers);
mysqli_stmt_execute($stmt);
/* If code reaches this point without errors then commit the data in the database */
mysqli_commit($mysqli);
} catch (mysqli_sql_exception $exception) {
mysqli_rollback($mysqli);
throw $exception;
}
?>注意
注意:
この関数は、トランザクションに 対応していないテーブル型（MyISAM あるいは ISAM など）では 動作しません。
参考
- mysqli_autocommit() - データベース更新の自動コミットをオンまたはオフにする
- mysqli_commit() - 現在のトランザクションをコミットする
- mysqli_rollback() - 現在のトランザクションをロールバックする
＋add a note
User Contributed Notes 2 notes
Ral ¶
6 years 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.
PHP Guru ¶
4 years ago
MySQL 5.6 introduces READ ONLY mode which applies optimizations to your transactions that can only be applied when it knows in advance that no table modifications will be made and that no locks will be issued.
The default access mode is READ WRITE in all versions up to and including MySQL 5.6. Starting in MySQL 5.7, the appropriate access mode is detected automatically. So if your transaction attempts modifications or table locks, it will automatically use READ WRITE mode, otherwise it will use READ ONLY mode and your transaction will benefit from the optimizations that come from that without having to explicitly declare is as READ ONLY.
Therefore the only time you need to explicitly declare an access mode is when you are using MySQL 5.6 and you are sure that you want READ ONLY mode. Note that any queries that attempt to modify tables or issue locks in READ ONLY mode will fail. Temporary tables can still be modified.
(Moderators. This post should replace the previous post that I made on the subject. Thanks.)