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                >[danger] hasOne() 一對一關聯 ```php <?php namespace app\model; use think\Model; /** * 用戶表模型 */ class User extends Model { /** * 關聯用戶資料表模型 */ public function profile() { // 用戶資料表的uid 對應用戶表的主鍵id return $this->hasOne(Profile::class, 'uid'); } } ``` >[danger] 模型查詢 ``` // $id 用戶id $data = self::find($id); // 沒有關聯到數據返回null // 關聯到數據返回用戶資料表模型數據對象 $profile = $data->profile; ``` ``` // $data 用戶表數據集模型對象 $data = self::select(); foreach ($data as $value) { // $value 用戶表數據模型對象 // $profile null或用戶資料表模型對象 $profile = $value->profile; } ```
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