Laravel入门教程（三）- 数据库操作 DB facade

1. 新建数据库表与连接数据库

1.1. 新建数据库表

/*
SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
`age` tinyint(4) DEFAULT '0',
`sex` tinyint(4) DEFAULT '10',
`created_at` int(11) DEFAULT '0',
`updated_at` int(11) DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=utf8;

1.2. 连接数据库

config/database.php

.env

.env

DB_HOST=127.0.0.1
DB_DATABASE=root
DB_USERNAME=''
DB_PASSWORD=secret

config/database.php

'mysql' => [
'driver'    => 'mysql',
'host'      => env('DB_HOST', 'localhost'),
'database'  => env('DB_DATABASE', 'forge'),
'username'  => env('DB_USERNAME', 'forge'),
'password'  => env('DB_PASSWORD', ''),
'charset'   => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix'    => '',
'strict'    => false,
'engine'    => null,
]

2. CURD操作

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\DB;

class StudentController extends Controller
{
public function test1()
{
// 选择
$student = DB::select('SELECT * FROM student');
var_dump($student); // 返回一个数组

// 插入
$bool = DB::insert('INSERT INTO student(name, age) VALUES(?, ?)', [
'Rebecca Liu', 19
]);
var_dump($bool); // 返回是否插入成功

$student = DB::select('SELECT * FROM student');
var_dump($student);

// 更新
$qty = DB::update('UPDATE student SET age = ? WHERE id = ?', [
22, 1002
]);
var_dump($qty); // 返回更新的行数

// 删除
$qty = DB::delete('DELETE FROM student WHERE id = ?', [1002]);\
var_dump($qty); // 返回删除的行数

}
}