Laravel查询构造器（query builder）提供方便、流畅的接口，用来建立执行数据库查找语法；

使用PDO参数绑定，以保护应用程序免于SQL注入因此传入的参数不需要额外转义特殊字符；

基本可以满足所有的数据库操作，而且在所有支持的数据库系统上都可以执行。

程序运行截图如下：

对应的表结构是这样的：

/*
SQLyog Ultimate v12.09 (64 bit)
MySQL - 5.7.12 : Database - laravel
*********************************************************************
*/

/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`laravel` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci */;

USE `laravel`;

/*Table structure for table `student` */

DROP TABLE IF EXISTS `student`;

CREATE TABLE `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

/*Data for the table `student` */

insert  into `student`(`id`,`name`,`age`) values (2,'小张',19),(3,'小明',18),(4,'小张',19);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

源码如下：

路由web.php添加：

Route::prefix('student')->group(function(){

    Route::get('dbFacadeInsert', 'StudentController@dbFacadeInsert');
    Route::get('dbFacadeSelect', 'StudentController@dbFacadeSelect');
    Route::get('dbFacadeModify', 'StudentController@dbFacadeModify');
    Route::get('dbFacadeDelete', 'StudentController@dbFacadeDelete');
});

这个config/database.php是数据库相关的设置，目前不用改，对应mysql是这样的。

需要修改的是

.env

修改为如下：

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel
DB_USERNAME=root
DB_PASSWORD=root

新建StudentController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\DB;

class StudentController extends Controller{

    public function dbFacadeSelect(){

        $students = DB::select('select * from student');
        var_dump($students);
        return "dbFacadeSelect";
    }

    public function dbFacadeInsert(){

        $bool = DB::insert('insert into student(name, age) value(?, ?)', ['小明', 18]);
        $bool = DB::insert('insert into student(name, age) value(?, ?)', ['小张', 19]);
        return "dbFacadeInsert";
    }

    public function dbFacadeModify(){

        $num = DB::update('update student set age = ? where name = ?', [20, '小明']);
        //var_dump($num);
        return "dbFacadeInsert";
    }

    public function dbFacadeDelete(){

        $num = DB::delete('delete from student where id = ?', [1]);
        var_dump($num);
        return "dbFacadeDelete";
    }

}