单数据查询
数据集查询
其它查询

<?php
namespace app\controller;
use think\facade\Db;
use app\model\Admin;
use think\model;

class Datec {
    public function index(){
        $user = Db::table("jk_admin")->select();
        // return $user;
        return json($user);
    }
    public function gadmin(){
        $ainfo = Admin::select();
        return json($ainfo);
    }
    public function ssql(){
        $asql = Db::table("jk_admin")->select();
        $asql = Db::connect("mysql")->table("jk_admin")->select();
        $asql = Db::table("jk_admin")->where("id",27)->find();
        $asql = Db::getLastSql();
        return $asql;
    }
}