让我爱恨的ThinkPHP Relation
来源：互联网 发布：php parent父类 编辑：程序博客网 时间：2024/04/30 05:35
还记得第一次用ThinkPHP的relation,做了一个关联查询，觉得特别好用。有那么一天尝试着用关联插入，怎么插，都插不进，我插，我擦！
后来在龙哥的指点下算是成功的实践了一次，后来怎么用都不顺，后来变远离了 relation,便觉得这是TP 本身的问题，却不知是自己没有找到问题的症结，还是编程届
的那句谚语说的好，你没有了解出现问题的真正原因，就不算解决了BUG。
最近公司做接口，两张表一对多的关系， 正常查询的话（select tag.*, evaluate.* from tbl_tag as tag,tbl_evaluate as evaluate where(tag.tag_id = evaluate.tag_id)）是多条记录，而需要返回如下的JSON数据：
{ "ret": "0", "msg": "ok", "data": [ { "tag_id": "1226", "name": "软件故障类", "type": "1", "Icon": "/style/images/sortImgs/small/", "created_at": "1373383665", "status": "1", "explain": "暂无", "changed_at": "1373383665", "evaluate_count": "5", "contents_type": "1", "process_id": null, "evaluate": [ { "evaluate_id": "4", "tag_id": "1226", "name": "任务创建时间", "limit_time": "0", "alert_time": "0", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null }, { "evaluate_id": "5", "tag_id": "1226", "name": "任务分配时间", "limit_time": "10", "alert_time": "5", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null }, { "evaluate_id": "6", "tag_id": "1226", "name": "任务领取时间", "limit_time": "15", "alert_time": "3", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null }, { "evaluate_id": "7", "tag_id": "1226", "name": "任务开始时间", "limit_time": "60", "alert_time": "20", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null }, { "evaluate_id": "8", "tag_id": "1226", "name": "任务结束时间", "limit_time": "240", "alert_time": "30", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null } ] }, { "tag_id": "1229", "name": "改进后的任务我22", "type": "1", "Icon": "/style/images/sortImgs/small/", "created_at": "1373700085", "status": "1", "explain": null, "changed_at": "1373700979", "evaluate_count": "5", "contents_type": "1", "process_id": null, "evaluate": [ { "evaluate_id": "10", "tag_id": "1229", "name": "时间1", "limit_time": "11", "alert_time": "6", "position": "1", "description": null, "isfixed": null, "status": null, "remark": null } ] }, { "tag_id": "1230", "name": "维修任务修改2", "type": "1", "Icon": "/style/images/sortImgs/small/", "created_at": "1373714061", "status": "1", "explain": null, "changed_at": "1373715337", "evaluate_count": "2", "contents_type": "1", "process_id": null, "evaluate": [ { "evaluate_id": "11", "tag_id": "1230", "name": "执行时间1", "limit_time": "4", "alert_time": "3", "position": "1", "description": null, "isfixed": "1", "status": "1", "remark": null }, { "evaluate_id": "12", "tag_id": "1230", "name": "执行时间1", "limit_time": "5", "alert_time": "4", "position": "2", "description": null, "isfixed": "1", "status": "1", "remark": null } ] } ]}阅读别人的代码的时候，发现TP的 relation能返回这样的数据，好了，躲不掉的Relation马上我就又凌乱了，之前的TP直接继承RelationModel,关联查询 so easy, 关键是公司继承了BaseModel,各种研究，各种陌生
/** * 通过id查询标签 */
public function show(){//自动校验$dr_tag=D('Tag');$condition=$dr_tag->create($_GET);if( false === $condition) exit(RS::jsonReturn($dr_tag->getError()));$dr_process = D('Process');$dr_process = $dr_process->switchModel ( 'Relation' );$linklist = ProcessModel::get_link ( 'this' );$dr_process->setProperty ( '_link', $linklist );$field = TagModel::getObjFields ( 'this' );$tags_id=$condition['tags_id'];$name=$condition['name'];$explain=$condition['explain'];if(empty($tags_id) && empty($name) && empty($explain)) exit(RS::jsonReturn("20001"));//查询条件if (!empty ( $tags_id)) $where ['tbl_tag.tag_id'] = array ('eq', $condition['tags_id'] );if (!empty ( $condition ['name'] )) $where ['tbl_tag.name'] = array ('eq', $name );if (!empty ( $condition ['explain'] )) $where ['tbl_tag.explain'] = array ('like','%'.$explain.'%');$where['tbl_tag.tag_id'][]=array('neq',999);$field[] = 'tbl_tag.tag_id';$field[] = 'tbl_tag.name';$field[] = 'tbl_tag.type';$field[] = 'tbl_tag.status';$field[] = 'tbl_tag.Icon';$field[] = 'tbl_tag.created_at';$field[] = 'tbl_tag.changed_at';$field[] = 'tbl_tag.explain';$field[] = 'tbl_tag.contents_type';$field[] = 'tbl_tag.process_id';$field[] = 'tbl_process.process_count';$data = $dr_process->field ( $field )->join ( 'right join tbl_tag ON tbl_tag.process_id = tbl_process.process_id' )->where ( $where )->relation ( true )->find();//返回数据if(empty($data)) exit(RS::jsonReturn("20000"));echo RS::jsonReturn("0",$data,"ok");}照猫画虎，自己来一个，尽管搞不明白：$linklist = ProcessModel::get_link ( 'this' );$dr_process->setProperty ( '_link', $linklist );//关联,显示所有任务类型和指标详情protected function tagsShow_link(){return array('evaluate'=>array('mapping_type' => HAS_MANY,'class_name'=>'Evaluate','foreign_key'=>'tag_id',//'mapping_name' =>'indexs','mapping_fields_name' =>'this'),);}/* 返回字段 */public static function tagsShowObjFields(){$ObjFields = self::$allObjFields;foreach ($ObjFields as $key=>$val){if('notifications_enabled' === $val) unset($ObjFields[$key]);}return $ObjFields;}结果就是出不来结果，Relation不出来，出来的就是关联的是false
源于不明白这个get_link和 setProperty总是以为是这里出了批漏，各种查，各种对比，各种纠结，一个人，在周六
$linklist = ProcessModel::get_link ( 'this' );$dr_process->setProperty ( '_link', $linklist );找到了一条靠谱的解决方法，是改RelationModel下面的M 方法为D （http://lhdeyx.blog.163.com/blog/static/318196972010112351516763/），我打开一看，晕死了，就是D；
之前都是在物理上实现外键约束的，现在是在逻辑上实现，以为Relation关联不上错在这里，实际上是无关的
无奈了，最后，想SQL语句，一开始就想到了，下面的，觉得可行，就是效率太低，PASS
$tag = D('Tag');$evaluate = D('Evaluate');$tag_ids = $tag->getField('tag_id,name');if(isset($_GET['since_at']) && !empty($_GET['since_at'])){$since_at = $_GET['since_at'];$condition['changed_at'] = array('gt',$since_at);}//echo $tag->getLastSQl();die();foreach($tag_ids as $key=>$val){$map['tag_id'] = array('eq',$key);$condition['tag_id'] = array('eq',$key);$result = $tag->where($condition)->find();$res = $evaluate->where($map)->select();$result['indexs'] = $res;$data[] = $result;}//返回数据if(empty($data)) exit(RS::jsonReturn("20000"));echo RS::jsonReturn("0",$data,"ok");后来就google大神，论坛，以至于差点用起了行列转换
--行列转换模型select name 姓名,max(case subject when '语文' then result else 0 end) 语文,max(case subject when '数学' then result else 0 end) 数学,max(case subject when '物理' then result else 0 end) 物理from tbgroup by name
纠结在继续，
在sql搞不定之后，回到了Relation,还是搞不定，夜很静了，我只能简单粗暴了，一开始的sql.
…………
方姐，来了，观察了一下情况，该有的都有了，于是
$data = $dr_tag->relation(true)->select();$evaluate = D('Evaluate'); echo $evaluate->getLastSql();die('dd');
我一下就反映过来了，告诉TA是limit_time,后来改了Model中的字段
sudo rm -rf *,TA迷人的样子让我折服，轻轻的在我耳边说，该了Model要删缓存，Ta 说的那么轻描淡写，我觉永远记住了
我之前也
echo $dr_tag->getLastSql();die('dd');提示的错误让人更纠结。回想Ta 解决BUG缜密思路，我…………提示你false, 我永远都不知道用被关联的表evaluate实例化后输出，直到Ta 展示给我
爱上了Relation, 爱上……
- 让我爱恨的ThinkPHP Relation
- 让我又爱又恨的C++
- 让我爱恨交织的软工文档
- SaaS让我爱恨交加
- 软件-让我又爱又恨
- 电脑让我又爱又恨
- google啊 让我又爱又恨
- 观察者模式，让我又爱又恨！
- 360 一个让人又爱又恨的公司
- 让人又爱又恨的信用评级
- 让人又爱又恨的const
- 让人又爱又恨的matlab2008a之mex
- 干TM的gradle，让我又爱又恨（不过几乎都是小问题23333333）
- 小米手机的售后让我伤心让我恨！！
- 我爱奥运,我恨奥运
- MS 让人又爱又恨
- skyline 让人又爱又恨
- Apple， 让你爱恨交织
- 混音器编程接口讨论
- C#实现的根据日期得到今天是星期几
- Request&Response
- JDBC
- 估算不同样本之间的相似性度量(Similarity Measurement)
- 让我爱恨的ThinkPHP Relation
- Log4J的配置信息
- android json解析及简单例子
- 对象初始化的执行顺序
- 安装wamp时 apache启动不了 非80端口占用的问题
- ssh三大框架，三层架构 整合测试！完整分页代码，JdbcTemplate等测试，存储过程调用，留着以后复习吧
- [每日一题] OCP1z0-047 :2013-07-16 主键与唯一索引.............................................................5
- 一个游戏程序员的学习资料（全是好书）
- 【转】关于python cookielib，urllib2,httplib 模块(HTTP状态码)
