多层Relation 扩展（3.13）

重载或重写 getRelation函数，以获得多层关联，关联参数：array('mapping_name'=>'next_mappingname_or_array', 'normal_mapping_name')
    /**<br>      * 获取返回数据的关联记录<br>      * @access protected<br>      * @param mixed $result  返回数据<br>      * @param string|array $name  关联名称<br>      * @param boolean $return 是否返回关联数据本身<br>      * @return array<br>      */<br>     protected function getRelation(&$result,$name='',$return=false) {<br>         if(!empty($this->_link)) {<br>             foreach($this->_link as $key=>$val) {<br>                 $mappingName =  !empty($val['mapping_name'])?$val['mapping_name']:$key; // 映射名称<br>                 if(empty($name) || true === $name || $mappingName == $name || (is_array($name) && (in_array($mappingName,$name) || array_key_exists($mappingName,$name) ))) {<br>                     $mappingType = !empty($val['mapping_type'])?$val['mapping_type']:$val;  //  关联类型<br>                     $mappingClass  = !empty($val['class_name'])?$val['class_name']:$key;            //  关联类名<br>                     $mappingFields = !empty($val['mapping_fields'])?$val['mapping_fields']:'*';     // 映射字段<br>                     $mappingCondition = !empty($val['condition'])?$val['condition']:'1=1';          // 关联条件<br>                     $mappingKey =!empty($val['mapping_key'])? $val['mapping_key'] : $this->getPk(); // 关联键名<br>                     if(strtoupper($mappingClass)==strtoupper($this->name)) {<br>                         // 自引用关联 获取父键名<br>                         $mappingFk   =   !empty($val['parent_key'])? $val['parent_key'] : 'parent_id';<br>                     }else{<br>                         $mappingFk   =   !empty($val['foreign_key'])?$val['foreign_key']:strtolower($this->name).'_id';     //  关联外键<br>                     }<br>                     // 获取关联模型对象<br>                     $model = D($mappingClass);<br>                     switch($mappingType) {<br>                         case HAS_ONE:<br>                             $pk   =  $result[$mappingKey];<br>                             $mappingCondition .= " AND {$mappingFk}='{$pk}'";<br>                             if (is_array($name) && array_key_exists($mappingName,$name)){<br>                                 $relationData   =  $model->relation($name[$mappingName])->where($mappingCondition)->field($mappingFields)->find();<br>                             }else{<br>                                 $relationData   =  $model->where($mappingCondition)->field($mappingFields)->find();<br>                             }<br>                             break;<br>                         case BELONGS_TO:<br>                             if(strtoupper($mappingClass)==strtoupper($this->name)) {<br>                                 // 自引用关联 获取父键名<br>                                 $mappingFk   =   !empty($val['parent_key'])? $val['parent_key'] : 'parent_id';<br>                             }else{<br>                                 $mappingFk   =   !empty($val['foreign_key'])?$val['foreign_key']:strtolower($model->getModelName()).'_id';     //  关联外键<br>                             }<br>                             $fk   =  $result[$mappingFk];<br>                             $mappingCondition .= " AND {$model->getPk()}='{$fk}'";<br>                             if (is_array($name) && array_key_exists($mappingName,$name)){<br>                                 $relationData   =  $model->relation($name[$mappingName])->where($mappingCondition)->field($mappingFields)->find();<br>                             }else<br>                                 $relationData   =  $model->where($mappingCondition)->field($mappingFields)->find();<br>                             break;<br>                         case HAS_MANY:<br>                             $pk   =  $result[$mappingKey];<br>                             $mappingCondition .= " AND {$mappingFk}='{$pk}'";<br>                             $mappingOrder =  !empty($val['mapping_order'])?$val['mapping_order']:'';<br>                             $mappingLimit =  !empty($val['mapping_limit'])?$val['mapping_limit']:'';<br>                             // 延时获取关联记录<br>                             if (is_array($name) && array_key_exists($mappingName,$name)){<br>                                 $relationData   =  $model->relation($name[$mappingName])->where($mappingCondition)->field($mappingFields)->order($mappingOrder)->limit($mappingLimit)->select();<br>                             }else<br>                                 $relationData   =  $model->where($mappingCondition)->field($mappingFields)->order($mappingOrder)->limit($mappingLimit)->select();<br>                             break;<br>                         case MANY_TO_MANY:<br>                             $pk   =  $result[$mappingKey];<br>                             $mappingCondition = " {$mappingFk}='{$pk}'";<br>                             $mappingOrder =  $val['mapping_order'];<br>                             $mappingLimit =  $val['mapping_limit'];<br>                             $mappingRelationFk = $val['relation_foreign_key']?$val['relation_foreign_key']:$model->getModelName().'_id';<br>                             $mappingRelationTable  =  $val['relation_table']?$val['relation_table']:$this->getRelationTableName($model);<br>                             $sql = "SELECT b.{$mappingFields} FROM {$mappingRelationTable} AS a, ".$model->getTableName()." AS b WHERE a.{$mappingRelationFk} = b.{$model->getPk()} AND a.{$mappingCondition}";<br>                             if(!empty($val['condition'])) {<br>                                 $sql   .= ' AND '.$val['condition'];<br>                             }<br>                             if(!empty($mappingOrder)) {<br>                                 $sql .= ' ORDER BY '.$mappingOrder;<br>                             }<br>                             if(!empty($mappingLimit)) {<br>                                 $sql .= ' LIMIT '.$mappingLimit;<br>                             }<br>                             if (is_array($name) && array_key_exists($mappingName,$name)){                                <br>                                 <br>                                 $mappingOrder =  !empty($val['mapping_order'])?$val['mapping_order']:'';<br>                                 $mappingLimit =  !empty($val['mapping_limit'])?$val['mapping_limit']:'';<br>                                 $relationData   =  $model->relation($name[$mappingName])<br>                                     ->field($model->getTableName().'.'.$mappingFields)<br>                                     ->join($mappingRelationTable." on  $mappingRelationTable.$mappingRelationFk = ".$model->getTableName().".".$model->getPk())<br>                                     ->where($mappingRelationTable.".{$mappingFk}='{$pk}'")<br>                                     ->order($mappingOrder)<br>                                     ->limit($mappingLimit)<br>                                     ->select();<br>                             }else<br>                                 $relationData   =   $this->query($sql);<br>                             break;<br>                     }<br>                     if(!$return){<br>                         if(isset($val['as_fields']) && in_array($mappingType,array(HAS_ONE,BELONGS_TO)) ) {<br>                             // 支持直接把关联的字段值映射成数据对象中的某个字段<br>                             // 仅仅支持HAS_ONE BELONGS_TO<br>                             $fields =   explode(',',$val['as_fields']);<br>                             foreach ($fields as $field){<br>                                 if(strpos($field,':')) {<br>                                     list($relationName,$nick) = explode(':',$field);<br>                                     $result[$nick]  =  $relationData[$relationName];<br>                                 }else{<br>                                     $result[$field]  =  $relationData[$field];<br>                                 }<br>                             }<br>                         }else{<br>                             $result[$mappingName] = $relationData;<br>                         }<br>                         unset($relationData);<br>                     }else{<br>                         return $relationData;<br>                     }<br>                 }<br>             }<br>         }<br>         return $result;<br>     }<br>  

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