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                ## 自定義查詢類 默認情況下,默認使用的查詢類是核心內置的`think\db\Query`類,如果你需要自己擴展額外的查詢方法,可以自定義查詢類,例如: ``` <?php namespace app\db; use think\db\Query; class MyQuery extends Query { public function top($num) { return $this->limit($num)->select(); } } ``` 然后在數據庫配置文件中設置`query`屬性如下 ``` 'connections' => [ 'mysql' => [ // 數據庫類型 'type' => 'mysql', // 服務器地址 'hostname' => '127.0.0.1', // 數據庫名 'database' => 'thinkphp', // 數據庫用戶名 'username' => 'root', // 數據庫密碼 'password' => '', // 數據庫連接端口 'hostport' => '', // 數據庫連接參數 'params' => [], // 數據庫編碼默認采用utf8 'charset' => 'utf8', // 數據庫表前綴 'prefix' => 'think_', // 自定義查詢類 'query' => '\app\db\MyQuery', ], ], ``` 設置后,在`Db`類或者模型里就可以使用`top`方法查詢 ``` User::where('id desc')->top(10); ```
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