tp5的一些查询

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        //不需要  use app\index\model\Store;
        $res = model('store')->all();
        $res = collection($res)->toArray();

        //需要  use app\index\model\Store;
        $res = store::select();
        $res = collection($res)->toArray();

        //六 必须指定完整表名
        $res = Db::table('jh_store')->select();
        //加false只返回sql语句 或者在select前面加上->fetchSql(true) 或者用getlastsql() 或者->buildSql();
        $res = Db::table('jh_store')->select(false);
        
        //七 原生查询
        $res = Db::query("select * from jh_store where store_id=127");

        //八也可以在table方法中指定数据库
        $res = Db::table('tianxi.tx_admin')->where('admin_id>1')->select();
        //__大写表名__这样写来代替全表名
        $res2 = Db::table('__STORE__')->select();
        //多表操作
        $res3 = Db::field('a.store_id,a.title,b.store_goods_id,b.shop_goods_name')
            ->table(['jh_store'=>'a','jh_store_goods'=>'b'])
            ->limit(10)->select();

         $res4 = Db::field('a.store_id,a.title,b.store_goods_id,b.shop_goods_name')
         ->table('jh_store')->alias('a')
         ->join('jh_store_goods b','b.store_id=a.store_id','LEFT')
         ->limit(10)->select();
         $res5 = Db::table('jh_store_goods')->where('store_id','127')->limit(100)->select();
		 Db::table('think_user')->alias(['think_user'=>'user','think_dept'=>'dept'])->join('think_dept','dept.user_id= user.id')->select();
        
        //分页完整查询
         $where['id']  = ['>',1];
         $where['mail']  = ['like','%[email protected]%'];
         $field = 'a.id,a.user_id,a.grades,a.is_involved,b.user_id,b.user_name,b.open_id,b.avatar,b.phone,c.user_id,c.alias_name';
		 $join = [
		 	 ['tx_user b', 'a.user_id=b.user_id', 'left'],
		 	 ['tx_user_info c', 'a.user_id=c.user_id', 'left']
		 ];
		 $data['user'] = Db::table('tx_game_record')->alias('a')->join($join)->field($field)->where($where)->paginate(10);
		 $data['page'] = $data['user']->render();
		 $data['total'] = $data['user']->total();
        
        //可以在查询中直接使用函数
        $res = Db::name('order_goods')->field('order_goods_id,SUM(price)')->select();
		//字段排除
        Db::table('think_user')->field('user_id,content',true)->select();
		//或者用
        Db::table('think_user')->field(['user_id','content'],true)->select();

		//分页查询
		Db::name('order_goods')->page('1,10')->select();//查询第一页的十条数据
        Db::name('order_goods')->page('2,10')->select();//查询第二页的十条数据
		$res = Db::name('order_goods')->limit(10)->page(2)->select();//查询第二页的十条数据
        
        //合并两个或多个语句的结果集
         $res = Db::field('name')->table('think_user')
         ->union('select name from think_user_1')
         ->union('select name from think_user_2')
         //->union(['SELECT name FROM think_user_1','SELECT name FROM think_user_2'])
         ->select();
        
        //去除重复
        Db::name('user')->distinct(true)->field('name')->select();
        //SQL:select distinct name from user

        //给sql语句添加注释
        Db::table('tp_user')
            ->comment('查询前十名的学生')
            ->field('name')
            ->limit(10)
            ->order('id asc')
            ->select();