Home > Database > Mysql Tutorial > ThinkPHP关联模型详解_MySQL

ThinkPHP关联模型详解_MySQL

WBOY
Release: 2016-06-01 13:12:34
Original
993 people have browsed it

ThinkPHP

        在ThinkPHP中,关联模型更类似一种mysql中的外键约束,但是外键约束更加安全,缺点却是在写sql语句的时候不方便,ThinkPHP很好得解决了这个问题.但是很多人不动关联模型的意思.现在就写个例子.让大家理解ThinkPHP关联模型的意思.

        环境描述:公司有一个员工表think_user,一个档案表,think_archives,一个部门表,think_department,和一个银行卡表.think_cars.

        一个员工只有一个档案表,所以关系就是HSA_ONE,

        一个员工只属于一个部门,但是部门里有多个员工,所以是BELONGS_TO关系

        一个员工有多个银行卡,但是一个银行卡只能属于一个员工.所以关系就是HAS_MANY.

        先创建需要的表和测试数据

       think_user表.

CREATE TABLE `think_user` (`id` int(11) NOT NULL AUTO_INCREMENT,`username` varchar(50) NOT NULL,`password` varchar(50) NOT NULL,`did` int(11) NOT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
Copy after login

        think_department

 CREATE TABLE `think_department` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(50) DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
Copy after login

        think_archives

CREATE TABLE `think_archives` (`id` int(7) NOT NULL AUTO_INCREMENT,`uid` int(11) NOT NULL,`addr` varchar(200) DEFAULT NULL,`email` varchar(30) DEFAULT NULL,`tel` int(13) DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
Copy after login

think_cars

CREATE TABLE `think_cars` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(50) DEFAULT NULL,`type` varchar(50) DEFAULT NULL,`uid` int(11) DEFAULT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8
Copy after login

插入数据到部门表think_department

insert into think_cars values (null,'gongxiang','工商卡','1'), (null,'jianshe','建行卡','2'), (null,'jiaohang','交通银行卡',3);
Copy after login

think_user数据

insert into think_archives values (null,1,'北京','123@163.com','13888888'),(null,2,'上海','111@qq.com','1377777'), (null,3,'重庆','222@qq.com','1344444'), (null,4,'天津','333@qq.com','1111111'),(null,5,'山西','444@qq.com','1322222'), (null,6,'河北','555@qq.com','1333333'), (null,7,'广州','6666@qq.com','13232323'),(null,8,'广东','7777@qq.com','121121212'), (null,9,'深证','888@qq.com','1821212');
Copy after login

think_cars数据

insert into think_cars values (null,'gongxiang','工商卡','1'),(null,'jianshe','建行卡','2'),(null,'jiaohang','交通银行卡',3);Query OK, 3 rows affected (0.01 sec)
Copy after login

think_archives

insert into think_archives values	(null,1,'北京','123@163.com','13888888'),	(null,2,'上海','111@qq.com','1377777'),	(null,3,'重庆','222@qq.com','1344444'),	(null,4,'天津','333@qq.com','1111111'), (null,5,'山西','444@qq.com','1322222'),	(null,6,'河北','555@qq.com','1333333'),	(null,7,'广州','6666@qq.com','13232323'),	(null,8,'广东','7777@qq.com','121121212'),(null,9,'深证','888@qq.com','1821212');
Copy after login

ok,数据和表创建完了,下面讲如何用ThinkPHP的关联模型去获取表中数据

现在Model文件夹里创建UserModel.class.php

<?phpclass UserModel extend RelationModel{}
Copy after login
  1. 先做部门和员工之间的关系.员工表的did和部门表的id对应

class UserModel extends RelationModel{	protected $_link=array(			'Department'=>array(					'mapping_type'=>BELONGS_TO,					'class_name'=>'Department',					'mapping_name'=>'Department',					'foreign_key'=>'did',				),		);}
Copy after login

mapping_type是要关联的模型类名

mapping_name 关联表的模型名称

foreign_key   关联表的外键定义

mapping_fields    关联表要查询的字段,默认为全部字段

condition   关联条件

parent_key 自引用关联字段

as_fields   字段别名定义

2.员工表和档案表之间的关系

protected $_link=array(			'Archives'=>array(					'mapping_type'=>HAS_ONE,					'class_name'=>'Archives',					'foreign_key'=>'id',					'condition'=>'uid'				),		);
Copy after login

3.员工表与银行卡表之间关系的定义

protected $_link=array(			'Cars'=>array(					'mapping_type'=>HAS_MANY,					'class_name'=>'Cars',					'foreign_key'=>'id',					'condition'=>'uid',				),		);
Copy after login

使用方法,在IndexAction.class.php中

class IndexAction extends Action {	public function index(){		$user=D('User');		$row=$user->relation(true)->select();		dump($row);	}}
Copy after login
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template