从yii2说起 2017.3.20

通过db执行sql语句

//添加Yii::app()->db->createCommand()->insert('tbl_user',array('username'=>'zhangsan','email'=>'zhangsan@zs.com'));

//修改Yii::app()->db->createCommand()->update('tbl_user',array('username'=>'Tester'),'id=:id',array(':id'=>3));

//删除Yii::app()->db->createCommand()->delete('tbl_user','id=:id',array(':id'=>2));

//查询 - 多条数据$users = Yii::app()->db->createCommand()

->select('*')

->from('tbl_user')

->queryAll();

//查询一条数据

$sql ="SELECT id,name FROM tbl_user WHERE email='123@qq.com'";

$users=Yii::app()->db->createCommand($sql)->queryRow();

php返回数据给ajax

echo json_encode($array);

php中json_decode()和json_encode()的使用方法

javascript  将json字符串转换为json对象的方法解析  (待搞懂)