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<?php |
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// +---------------------------------------------------------------------- |
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// | ThinkPHP [ WE CAN DO IT JUST THINK ] |
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// +---------------------------------------------------------------------- |
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// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved. |
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// +---------------------------------------------------------------------- |
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 ) |
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// +---------------------------------------------------------------------- |
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// | Author: liu21st <[email protected]> |
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// +---------------------------------------------------------------------- |
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namespace think\model\relation; |
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use Closure; |
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use think\App; |
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use think\db\Query; |
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use think\Exception; |
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use think\Model; |
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use think\model\Relation; |
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/** |
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* 远程一对一关联类 |
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*/ |
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class HasOneThrough extends Relation |
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{ |
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/** |
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* 中间关联表外键 |
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* @var string |
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*/ |
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protected $throughKey; |
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/** |
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* 中间表模型 |
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* @var string |
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*/ |
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protected $through; |
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/** |
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* 架构函数 |
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* @access public |
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* @param Model $parent 上级模型对象 |
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* @param string $model 模型名 |
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* @param string $through 中间模型名 |
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* @param string $foreignKey 关联外键 |
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* @param string $throughKey 关联外键 |
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* @param string $localKey 当前主键 |
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*/ |
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public function __construct(Model $parent, string $model, string $through, string $foreignKey, string $throughKey, string $localKey) |
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{ |
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$this->parent = $parent; |
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$this->model = $model; |
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$this->through = $through; |
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$this->foreignKey = $foreignKey; |
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$this->throughKey = $throughKey; |
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$this->localKey = $localKey; |
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$this->query = (new $model)->db(); |
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} |
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/** |
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* 延迟获取关联数据 |
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* @access public |
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* @param array $subRelation 子关联名 |
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* @param Closure $closure 闭包查询条件 |
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* @return Model |
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*/ |
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public function getRelation(array $subRelation = [], \Closure $closure = null) |
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{ |
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if ($closure) { |
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$closure($this->query); |
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} |
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$this->baseQuery(); |
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return $this->query->relation($subRelation)->find(); |
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} |
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/** |
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* 根据关联条件查询当前模型 |
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* @access public |
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* @param string $operator 比较操作符 |
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* @param integer $count 个数 |
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* @param string $id 关联表的统计字段 |
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* @param string $joinType JOIN类型 |
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* @return Query |
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*/ |
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public function has(string $operator = '>=', int $count = 1, string $id = '*', $joinType = '') |
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{ |
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return $this->parent; |
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} |
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/** |
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* 根据关联条件查询当前模型 |
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* @access public |
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* @param mixed $where 查询条件（数组或者闭包） |
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* @param mixed $fields 字段 |
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* @param string $joinType JOIN类型 |
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* @return Query |
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*/ |
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public function hasWhere($where = [], $fields = null, $joinType = '') |
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{ |
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throw new Exception('relation not support: hasWhere'); |
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} |
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/** |
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* 预载入关联查询 |
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* @access public |
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* @param array $resultSet 数据集 |
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* @param string $relation 当前关联名 |
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* @param array $subRelation 子关联名 |
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* @param Closure $closure 闭包 |
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* @return void |
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*/ |
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public function eagerlyResultSet(array &$resultSet, string $relation, array $subRelation = [], Closure $closure): void |
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{} |
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/** |
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* 预载入关联查询 返回模型对象 |
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* @access public |
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* @param Model $result 数据对象 |
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* @param string $relation 当前关联名 |
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* @param array $subRelation 子关联名 |
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* @param Closure $closure 闭包 |
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* @return void |
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*/ |
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public function eagerlyResult(Model $result, string $relation, array $subRelation = [], Closure $closure = null): void |
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{} |
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/** |
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* 关联统计 |
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* @access public |
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* @param Model $result 数据对象 |
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* @param Closure $closure 闭包 |
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* @param string $aggregate 聚合查询方法 |
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* @param string $field 字段 |
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* @return integer |
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*/ |
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public function relationCount(Model $result, Closure $closure, string $aggregate = 'count', string $field = '*') |
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{} |
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/** |
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* 执行基础查询（仅执行一次） |
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* @access protected |
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* @return void |
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*/ |
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protected function baseQuery(): void |
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{ |
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if (empty($this->baseQuery) && $this->parent->getData()) { |
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$through = $this->through; |
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$alias = App::parseName(App::classBaseName($this->model)); |
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$throughTable = $through::getTable(); |
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$pk = (new $through)->getPk(); |
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$throughKey = $this->throughKey; |
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$modelTable = $this->parent->getTable(); |
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$fields = $this->getQueryFields($alias); |
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$this->query |
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->field($fields) |
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->alias($alias) |
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->join($throughTable, $throughTable . '.' . $pk . '=' . $alias . '.' . $throughKey) |
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->join($modelTable, $modelTable . '.' . $this->localKey . '=' . $throughTable . '.' . $this->foreignKey) |
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->where($throughTable . '.' . $this->foreignKey, $this->parent->{$this->localKey}); |
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$this->baseQuery = true; |
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} |
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} |
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} |
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