tingwu/app/controller/Data.php

<?php
/**
 * Created by PhpStorm.
 * User: 97
 */

namespace app\controller;

use app\BaseController;
use think\facade\Db;//第一种  通过门面模式的方式获取

use app\model\Demo;
class Data extends BaseController{

    /**
     * 通过模型的方法获取 数据库数据
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function model1(){
        $result = Demo::find(2);
        dump($result->toArray());
    }

    public function model2(){
        $modelObj = new Demo();
        $result = $modelObj->where("category_id",3)
            ->limit(2)
            ->select();
//        dump($result);

        foreach ($result as $resultvar){
//            dump($resultvar->title);

            dump($resultvar['title']);


            dump($resultvar->status_text);
        }

    }


    /**
     * 查询数据
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function index(){

//        //第一种  通过门面模式的方式获取
//        $result = Db::table("mall_demo")->where("id",2)->find();
//        dump($result);

//        //通过容器的方式来获取
//        $result = app("db")->table("mall_demo")->where("id",2)->find();
//        dump($result);

        //获取一条
        $result = Db::table("mall_demo")
            ->order("id","desc")
            ->find();
        dump($result);

        //获取获取多条
        $result = Db::table("mall_demo")
            ->order("id","desc")
            ->limit(2,2) //可以做分页的逻辑 --- 这个需要计算开始值
            ->select();
        dump($result);

        //获取获取多条 -- 分页方式
        $result = Db::table("mall_demo")
            ->order("id","desc")
            ->page(1,2) //可以做分页的逻辑  ---  这个不需要计算开始值
            ->select();
        dump($result);

        //获取获取多条 -- 范围值
        $result = Db::table("mall_demo")
            ->where("id",">",2)
            ->select();
        dump($result);

        //获取获取多条 -- 多条件
        $result = Db::table("mall_demo")
            ->where("id",">",2)
            ->where("category_id","=",3)
            ->select();
        dump($result);

        //获取获取多条 -- 多条件
        $result = Db::table("mall_demo")
            ->where([
                ["id",">",2],
                ["category_id","=",3],
                ["id","in","4,5,6"]
            ])
            ->select();
        dump($result);

    }

    /**
     * 打印sql
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public function abc(){
        //第一种  --- 打印sql
        $result = Db::table("mall_demo")->where("id",2)->fetchSql()->find();
        dump($result);
        //第二种  --- 打印sql
        $result = Db::table("mall_demo")->where("id",2)->find();
        echo Db::getLastSql();
        exit;
    }

    /**
     * 新增逻辑
     */
    public function demo(){
        $data = [
            "title" => "深刻的反思就",
            "category_id" => 4,
        ];
        $result = Db::table("mall_demo")->insert($data);
        echo Db::getLastSql();
        dump($result);
    }

    /**
     * 真正删除逻辑
     */
    public function demodel(){
        $result = Db::table("mall_demo")->where("id",1)->delete(1);
        echo Db::getLastSql();
        dump($result);
    }

    /**
     * 真正更新逻辑
     */
    public function demoupdate(){
        $result = Db::table("mall_demo")
            ->where("id",2)
            ->update([
                "title" => "真是的哎",
            ]);
        echo Db::getLastSql();
        dump($result);
    }
}