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                ## 獲取器(`V5.1.20+`) Db類也可以支持獲取器定義,例如: ~~~ Db::name('user')->withAttr('name', function($value, $data) { return strtolower($value); })->select(); ~~~ 上面的代碼,查詢的數據集數據中的`name`字段的值會統一進行小寫轉換。 >[danger] `withAttr`方法可以多次調用,對多個字段定義獲取器。 > 支持對JSON字段定義獲取器,例如: ~~~ $user = Db::name('user') ->json(['info']) ->withAttr('info.name', function($value, $data) { return strtolower($value); })->find(1); dump($user); ~~~ 查詢結果返回的時候,會自動對`info`字段(`JSON`字段)的`name`屬性使用獲取器操作。
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