Yii框架实现对数据库的CURD操作示例

<?php
namespace app\models;
use yii\db\ActiveRecord;
//继承ActiveRecord实现CURD操作
class user extends ActiveRecord
{
}

namespace app\controllers;
use yii\web\Controller;
use app\models\user;

$sql = "select * from user where UserId = :id";
$res = user::findBySql($sql,['id'= 1])- all();
print_r($res[0]);
//如果只需要查询一条数据
$res = user::findBySql($sql,['id'= 1])- one();
print_r($res);

$res = user::find()- where(['id'= 1])- one();
print_r($res);

$user = new user();
//直接数据库中的字段作为属性赋值，属性名需和数据名字相同，否则报错
$user- UserName = "Doubly";
$user- Password = "123";
$user- Email = "doubly_yi@qq.com";
//调用user对象的save方法就可以保存
$user- save();

//首先获取需要修改的对象
$user = user::find()- where(['UserId'= 1])- one();
//设置需要修改的属性
$user- UserName = "益";
//调用对象的update()
$user- update();

//首先获取需要删除的对象
$user = user::find()- where(['UserId'= 1])- one();
//执行对象的delete()方法
$user- delete();