PHP——laravel之DB類->查詢

DB類之查詢：

1. 滿足條件的全部獲取：DB::table("表名")->where("name",">","1")->get();
2. 滿足條件的第一列獲取：DB::table("表名")->where("name",">","1")->first();
3. 滿足條件的全部字段：DB::table("表名")->where("name",">","1")->lists("title");
4. 滿足條件的單一字段：DB::table("表名")->where("name",">","1")->pluck("title");//返回二位字段值數組
   　　                             DB::table("表名")->where("name",">","1")->pluck("title","name");//返回二位字段值數組 第二個參數指定key
5. 分塊查詢數據列：DB::table("表名")->chunk(100,function($users){
   //$users to do $user是table中2行一次查詢的結果
   //return false; 停止處理接下來的數據
   })
6. 指定查詢字句：DB::table("表名")->select("name","email")->get();
7. 增加查詢子句到已有查詢中：$query=DB::table("表名")->select("name","email");$query->addSelect("age")->get();
8. 條件查詢where和orWhere：DB::table("表名")->where("name",">","10")->orWhere("titile","=","0")->get();
9. 條件查詢whereBetween和whereNotBetween：DB::table("表名")->where("name",">","10")->whereBetween("titile","=","[0,10]")->get();
10. 條件查詢whereIn：DB::table("表名")->where("name",">","10")->whereIn("titile","[1,2,3]")->get();
11. 條件查詢whereNull：DB::table("表名")->where("name",">","10")->whereNull("titile")->get();//未配置的值
12. 條件查詢where Clauses：DB::table("表名")->where("name",">","10")->whereNameAndTitle("name",titile")->get()；
13. 排序（Drder 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();