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                # swoole_mysql->begin 啟動事務。函數原型: ```php function swoole_mysql->begin(callable $callback); ``` * 啟動一個MySQL事務,事務啟動成功會回調指定的函數 * 與`commit`和`rollback`結合實現MySQL事務處理 * 同一個MySQL連接對象,同一時間只能啟動一個事務 * 必須等到上一個事務`commit`或`rollback`才能繼續啟動新事務 * 否則底層會拋出`Swoole\MySQL\Exception`異常,異常`code`為`21` > 事務處理在`1.9.15`或更高版本可用 使用實例 ---- ```php $db->begin(function( $db, $result) { $db->query("update userinfo set level = 22 where id = 1", function($db, $result) { $db->commit(function($db, $result) { echo "commit ok\n"; }); }); }); ```
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