Laravel - DB facade实现CURD

1.查看app\config\database.php

'default' => env('DB_CONNECTION', 'mysql'),

默认用的mysql数据库,接着向下看

'connections' => [        'sqlite' => [            'driver' => 'sqlite',            'database' => env('DB_DATABASE', database_path('database.sqlite')),            'prefix' => '',        ],        'mysql' => [            'driver' => 'mysql',            'host' => env('DB_HOST', 'localhost'),            'port' => env('DB_PORT', '3306'),            'database' => env('DB_DATABASE', 'forge'),            'username' => env('DB_USERNAME', 'forge'),            'password' => env('DB_PASSWORD', ''),            'charset' => 'utf8',            'collation' => 'utf8_unicode_ci',            'prefix' => '',            'strict' => true,            'engine' => null,        ],        ...    ],

这里涉及到env环境变量
来到工程目录下的.env文件

DB_CONNECTION=mysqlDB_HOST=127.0.0.1DB_PORT=3306DB_DATABASE=sugarDB_USERNAME=rootDB_PASSWORD=666666

这里配置我们要连接的数据库名,以及用户名和密码

2.建立控制器
App\Http\Controllers
目录下面是MVC的C层代码
建立Student表的控制器

<?phpnamespace App\Http\Controllers;use Illuminate\Support\Facades\DB;class  StudentController extends Controller{    public function queryData(){        $students = DB::select('select * from student');        var_dump($students);    }}

然后编写路由控制
在routes\web.php
下面增加

Route::any('querystudent', "StudentController@queryData");

然后通过浏览器访问

查询成功,当前还没有数据…

3.插入数据

public function insertData()    {        $ok = DB::insert('insert into student(name, age) values(?,?)', ['shone',25]);        var_dump($ok);    }

路由添加

Route::any('insertstudent', "StudentController@insertData");

浏览器访问

好了,然后看下数据库

是不是多了一条数据呢!

4.修改数据

    public function updateData()    {        $num = DB::update('update student set age=? where name=?', [30, 'shone']);        var_dump($num);    }

路由增加

Route::any('updatestudent', "StudentController@updateData");

访问,这里只有一条数据被修改了,所以打印1

看看数据库,原来age是25,现在是30

如果现在select查询呢

public function queryData()    {        $students = DB::select('select * from student');        dd($students);    }

结果:

5.删除数据

  public function deleteData()    {        $num = DB::delete('delete from student where name=?', ['shone']);        var_dump($num);    }

路由

Route::any('deletestudent', "StudentController@deleteData");

访问

再看看数据库

原来的一条数据被删除了!