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.";
//调用user对象的save方法就可以保存
$user->save();

//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();

//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();