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                # 監聽SQL 如果開啟數據庫的調試模式的話,你可以對數據庫執行的任何SQL操作進行監聽,使用如下方法: ``` Db::listen(function ($sql, $time, $explain) { // 記錄SQL echo $sql . ' [' . $time . 's]'; // 查看性能分析結果 dump($explain); }); ``` > 默認如果沒有注冊任何監聽操作的話,這些SQL執行會被根據不同的日志類型記錄到日志中。一旦設置了SQL監聽,則SQL日志需要自己接管。 `V5.1.12+`版本開始,`listen`方法增加`master`參數用于標記當前的主從查詢。 ``` Db::listen(function ($sql, $time, $explain, $master) { // 記錄SQL echo $sql . ' [' . $time . 's] ' . ($master ? 'master' : 'slave'); // 查看性能分析結果 dump($explain); }); ```
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