Selects · Laravel 5中文文檔

## 從數據表中取得所有的數據列 ~~~ $users = DB::table('users')->get(); foreach ($users as $user) { var_dump($user->name); } ~~~ ## 從數據表中分塊查找數據列 ~~~ DB::table('users')->chunk(100, function($users) { foreach ($users as $user) { // } }); ~~~ 通過在閉包中返回 false 來停止處理接下來的數據列： ~~~ DB::table('users')->chunk(100, function($users) { // return false; }); ~~~ ## 從數據表中取得單一數據列 ~~~ $user = DB::table('users')->where('name', 'John')->first(); var_dump($user->name); ~~~ ## 從數據表中取得單一數據列的單一字段 ~~~ $name = DB::table('users')->where('name', 'John')->pluck('name'); ~~~ ## 取得單一字段值的列表 ~~~ $roles = DB::table('roles')->lists('title'); ~~~ 這個方法將會返回數據表 role 的 title 字段值的數組。你也可以通過下面的方法，為返回的數組指定自定義鍵值。 ~~~ $roles = DB::table('roles')->lists('title', 'name'); ~~~ ## 指定查詢子句 (Select Clause) ~~~ $users = DB::table('users')->select('name', 'email')->get(); $users = DB::table('users')->distinct()->get(); $users = DB::table('users')->select('name as user_name')->get(); ~~~ ## 增加查詢子句到現有的查詢中 ~~~ $query = DB::table('users')->select('name'); $users = $query->addSelect('age')->get(); ~~~ ## 使用 where 及運算符 ~~~ $users = DB::table('users')->where('votes', '>', 100)->get(); ~~~ ## 「or」語法 ~~~ $users = DB::table('users') ->where('votes', '>', 100) ->orWhere('name', 'John') ->get(); ~~~ ## 使用 Where Between ~~~ $users = DB::table('users') ->whereBetween('votes', [1, 100])->get(); ~~~ ## 使用 Where Not Between ~~~ $users = DB::table('users') ->whereNotBetween('votes', [1, 100])->get(); ~~~ ## 使用 Where In 與數組 ~~~ $users = DB::table('users') ->whereIn('id', [1, 2, 3])->get(); $users = DB::table('users') ->whereNotIn('id', [1, 2, 3])->get(); ~~~ ## 使用 Where Null 找有未配置的值的數據 ~~~ $users = DB::table('users') ->whereNull('updated_at')->get(); ~~~ ## Dynamic Where Clauses You may even use "dynamic" where statements to fluently build where statements using magic methods: ~~~ $admin = DB::table('users')->whereId(1)->first(); $john = DB::table('users') ->whereIdAndEmail(2, 'john@doe.com') ->first(); $jane = DB::table('users') ->whereNameOrAge('Jane', 22) ->first(); ~~~ ## 排序(Order By)、分群(Group By) 及 Having ~~~ $users = DB::table('users') ->orderBy('name', 'desc') ->groupBy('count') ->having('count', '>', 100) ->get(); ~~~ ## 偏移(Offset) 及限制(Limit) ~~~ $users = DB::table('users')->skip(10)->take(5)->get(); ~~~