标签：style blog http io ar color os 使用 sp
一、关联模型 ( RelationMondel )
1.数据查询
① HAS_ONE 查询
创建两张数据表评论表和文章表： tpk_comment , tpk_article 。评论和文章的对应关系为，一条评论 id 对应一篇文章，为 ONE_TO_ONE 关系 ( 一对一 )。评论表的结构为：
其中 aid 字段与文章表的 id 字段对应。打开自定义模型 ArticleModel，让模型继承于 RelationModel，然后定义成员属性 $_link，代码：
ArticleModel.class.php：
<?php class ArticleModel extends RelationModel{ protected $_link = array( //关联模型（表）1 ‘comment‘=>array( //元素（属性）定义 ‘mapping_type‘=>HAS_ONE, ‘class_name‘=>"comment",
"mapping_name"=>"comment", "foreign_key"=>"aid", "mapping_fields"=>array("id","comment","comment_time"),
"as_fields"=>"id:comment_id,comment,comment_time", ), }
foreign_key 为必须的。
控制器：IndexAction.class.php：
<?php class IndexAction extends Action { public function relation(){ $obj=D("Article"); $rows=$obj->field(‘id,title‘)->relation(true)->select(); dump($rows); } }
浏览器输出：
array(6) { [0] => array(5) { ["id"] => string(1) "1" ["title"] => string(4) "test" ["comment_id"] => string(1) "1" ["comment"] => string(15) "第一条评论" ["comment_time"] => string(19) "2014-11-22 22:40:01" } [1] => array(5) { ["id"] => string(1) "2" ["title"] => string(12) "吼吼吼吼" ["comment_id"] => string(1) "2" ["comment"] => string(15) "第二条评论" ["comment_time"] => string(19) "2014-11-22 22:40:06" } [2] => array(5) { ["id"] => string(1) "4" ["title"] => string(7) "test2_m" ["comment_id"] => NULL ["comment"] => NULL ["comment_time"] => NULL } [3] => array(5) { ["id"] => string(1) "5" ["title"] => string(2) "22" ["comment_id"] => NULL ["comment"] => NULL ["comment_time"] => NULL } [4] => array(5) { ["id"] => string(1) "6" ["title"] => string(1) "1" ["comment_id"] => NULL ["comment"] => NULL ["comment_time"] => NULL } [5] => array(5) { ["id"] => string(1) "7" ["title"] => string(6) "lalala" ["comment_id"] => NULL ["comment"] => NULL ["comment_time"] => NULL } }
此时文章表和评论表的数据为：
评论表：
文章表：
② BELONGS_TO 查询
一条评论数据对应一个用户 id，评论表和用户表之间的关系是 BELONGS_TO
创建自定义模型 CommentModel，继承于RelationModel：
CommentModel.class.php:
<?php class CommentModel extends RelationModel{ protected $_link = array( ‘user‘=>array( "mapping_type"=>BELONGS_TO, "foreign_key"=>"comment_user", "mapping_fields"=>array("id","username"), "as_fields"=>"id:user_id,username", ), ); }
tpk_user 表结构
数据：
控制器 ArticleModel.class.php:
<?php class IndexAction extends Action { //BELONGS_TO public function relation2(){ $obj=D("Comment"); $rows=$obj->relation(true)->select(); dump($rows); } }
访问 http://127.0.0.26/index.php/index/relation2
显示：
array(2) { [0] => array(7) { ["id"] => string(1) "1" ["aid"] => string(1) "1" ["comment"] => string(15) "第一条评论" ["comment_time"] => string(19) "2014-11-22 22:40:01" ["comment_user"] => string(1) "1" ["user_id"] => string(1) "1" ["username"] => string(3) "dee" } [1] => array(7) { ["id"] => string(1) "2" ["aid"] => string(1) "2" ["comment"] => string(15) "第二条评论" ["comment_time"] => string(19) "2014-11-22 22:40:06" ["comment_user"] => string(1) "2" ["user_id"] => string(1) "2" ["username"] => string(4) "yoko" } }
③ HAS_MANY
一篇文章可以对应多条评论，评论表和文章表之间的关系为 HAS_MANY
此时评论表的数据为：
模型：CommentModel.class.php:
<?php class CommentModel extends RelationModel{ //关联模型2 HAS_MANY ‘comment‘=>array( ‘mapping_type‘=>HAS_MANY, ‘foreign_key‘=>"aid", ), }
控制器 ArticleModel.class.php:
<?php class IndexAction extends Action { //HAS_MANY public function relation3(){ $obj=D("Article"); $rows=$obj->relation(true)->select(); dump($rows); } }
访问 http://127.0.0.26/index.php/index/relation3
显示：
array(6) { [0] => array(8) { ["id"] => string(1) "1" ["title"] => string(4) "test" ["content"] => string(12) "test_content" ["category"] => string(13) "test_category" ["area"] => string(6) "北京" ["add_user"] => string(5) "admin" ["add_time"] => string(19) "2014-11-20 23:03:44" ["comment"] => array(2) { [0] => array(5) { ["id"] => string(1) "1" ["aid"] => string(1) "1" ["comment"] => string(15) "第一条评论" ["comment_time"] => string(19) "2014-11-22 22:40:01" ["comment_user"] => string(1) "1" } [1] => array(5) { ["id"] => string(1) "2" ["aid"] => string(1) "1" ["comment"] => string(15) "第二条评论" ["comment_time"] => string(19) "2014-11-22 22:40:06" ["comment_user"] => string(1) "2" } } } [1] => array(8) { ["id"] => string(1) "2" ["title"] => string(12) "吼吼吼吼" ["content"] => string(18) "任溶溶柔然人" ["category"] => string(14) "test_category2" ["area"] => string(6) "河北" ["add_user"] => string(5) "admin" ["add_time"] => string(19) "2014-11-22 15:16:12" ["comment"] => NULL } [2] => array(8) { ["id"] => string(1) "4" ["title"] => string(7) "test2_m" ["content"] => string(4) "haha" ["category"] => string(0) "" ["area"] => string(6) "福建" ["add_user"] => NULL ["add_time"] => string(19) "2014-11-22 11:44:26" ["comment"] => NULL } [3] => array(8) { ["id"] => string(1) "5" ["title"] => string(2) "22" ["content"] => NULL ["category"] => string(0) "" ["area"] => string(6) "福建" ["add_user"] => NULL ["add_time"] => string(19) "2014-11-22 12:40:58" ["comment"] => NULL } [4] => array(8) { ["id"] => string(1) "6" ["title"] => string(1) "1" ["content"] => string(1) "2" ["category"] => string(0) "" ["area"] => string(6) "福建" ["add_user"] => NULL ["add_time"] => NULL ["comment"] => NULL } [5] => array(8) { ["id"] => string(1) "7" ["title"] => string(6) "lalala" ["content"] => string(6) "hohoho" ["category"] => string(0) "" ["area"] => string(6) "北京" ["add_user"] => NULL ["add_time"] => NULL ["comment"] => NULL } }
2.数据操作
以 HAS_MANY 为例，在tpk_article中添加一篇文章，同时 tpk_comment 中添加两条评论。代码：
控制器 ArticleModel.class.php:
//HAS_MANY 操作，tpk_article中添加一篇文章，同时tpk_comment中添加两条评论 public function reladd(){ $obj=D("Article"); $data[‘title‘]="新闻标题"; $data[‘content‘]=‘这是一条体育新闻‘; $data[‘add_time‘]=date("Y-m-d H:i:s",time()); //关联的模型 $data[‘comment‘]=array( array("aid"=>20,"comment"=>"体育新闻评论1","comment_time"=>date("Y-m-d H:i:s",time()),"comment_user"=>1), array("aid"=>20,"comment"=>"体育新闻评论2","comment_time"=>date("Y-m-d H:i:s",time()),"comment_user"=>1), ); $obj->relation(true)->add($data); }
另一个例子，删除文章的同时也删除了评论：
控制器 IndexAction.class.php:
<?php class IndexAction extends Action { //HAS_MANY 删除 public function reldel(){ $obj=D("Article"); $obj->relation(true)->delete(20); echo $obj->getLastSql(); } }
二、高级模型 ( AdvModel )
高级模型除了可以实现普通模型所有功能之外，还能够实现数据过滤、操作限制、延迟操作等功能。
例子：
定位查询 getN() , first , last
getN(2) :获取结果集正序第 3 条记录
Model 代码：
<?php class ArticleModel extends AdvModel{ //.... }
控制器代码：
<?php class IndexAction extends Action { //使用高级模型定位查询 // $obj=D("Article"); // $rows=$obj->getN(2); // dump($rows); // echo $obj->getLastSql(); //使用高级模型动态查询 // $obj=D("Article"); // $rows=$obj->getByArea("北京"); // dump($rows); // echo $obj->getLastSql(); //使用高级模型动态查询2 // $obj=D("Article"); // $rows=$obj->getFieldByArea("北京","id"); // dump($rows); // echo $obj->getLastSql(); //使用高级模型动态查询3 // $obj=D("Article"); // $rows=$obj->top5(); // dump($rows); // echo $obj->getLastSql(); } }
参考资料：《PHP MVC 开发实战》
ThinkPHP 学习笔记 ( 四 ) 数据库操作之关联模型 ( RelationMondel ) 和高级模型 ( AdvModel )
标签：style blog http io ar color os 使用 sp
原文地址：http://www.cnblogs.com/dee0912/p/4117842.html
