thinkphp关联操作

比如：你要求删除用户的时候，同时删除与用户有关的所有信息。　　
　　
一对一:  有 （HAS_ONE）   属于 （BELONGS_TO）
    
一对多:  有 （HAS_MANY）  属于 （BELONG_TO）
    
多对多:  （MANY_TO_MANY）

HAS_ONE  HAS_MANY:

表aoli_member

表aoli_good

MemberModel.class.php

<?php
class MemberModel extends RelationModel{
    protected $_link=array(
        'good'=>array(
            'mapping_type'=>HAS_MANY,//HAS_ONE查询出一条
            'class_name'=>'good',
            'mapping_name'=>'good',
            'foreign_key'=>'uid',
            'mapping_fields'=>array('id','uid','title'),
            'as_fields'=>'title,id:goodid',
            //'condition'=>'',//筛选条件
            //'foreign_key'=>'',//外键
            //'mapping_fields'=>'',//关联字段
            //as_fields
        ),   
    );   
}
?>

MemberAction.class.php

关联查询
<?php
class MemberAction extends Action{
    function index(){
        $member=D('member');   
        //关联查询
        $list=$member->relation(true)->select();
        dump($list);
    }   
}
?>

关联插入
<?php
class MemberAction extends Action{
    function index(){
        $member=D('member');   
       
        //关联插入
        $data['username']='bbbbbbb';
        $data['password']='bbbbbbb';
        $data['good']=array(
                          array('title'=>'郝杰'),
                          array('title'=>'燕子'),
                      );
        $list=$member->relation(true)->add($data);
       
        //关联查询
        $list=$member->relation(true)->select();
        dump($list);
    }   
}
?>

关联更新
<?php
class MemberAction extends Action{
    function index(){
        $member=D('member');   
       
        $data['username']='杰天使';
        $data['password']='jieangel';
        $data['good']=array(
                          array('id'=>1,'title'=>'郝杰'),
                          array('id'=>2,'title'=>'燕子'),
                      );
        //关联更新
        $list=$member->relation(true)->where('id=1')->save($data);
       
        dump($list);
    }   
}
?>

关联删除
<?php
class MemberAction extends Action{
    function index(){
        $member=D('member');      
        //关联删除
        $list=$member->relation(true)->delete('4');
       
    }   
}
?>

BELONGS_TO:

GoodAction.class.php

<?php
class GoodAction extends Action{
    function index(){
        $good=D('good');      
        $list=$good->relation(true)->select();
        dump($list);
    }   
}
?>

GoodModel.class.php

<?php
class GoodModel extends RelationModel{
    protected $_link=array(
        'member'=>array(
            'mapping_type'=>BELONGS_TO,
            'foreign_key'=>'uid', 
        ),
    );
}
?>

转自http://blog.sina.com.cn/s/blog_7fb1495b0100y5x7.html