158 lines
5.0 KiB
PHP
158 lines
5.0 KiB
PHP
<?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) 2006~2018 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 <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace think\model\relation;
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use think\db\Query;
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use think\Exception;
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use think\Loader;
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use think\Model;
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use think\model\Relation;
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class HasManyThrough extends Relation
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{
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// 中间关联表外键
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protected $throughKey;
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// 中间表模型
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protected $through;
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/**
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* 构造函数
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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 关联主键
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*/
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public function __construct(Model $parent, $model, $through, $foreignKey, $throughKey, $localKey)
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{
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$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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* @param string $subRelation 子关联名
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* @param \Closure $closure 闭包查询条件
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* @return false|\PDOStatement|string|\think\Collection
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*/
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public function getRelation($subRelation = '', $closure = null)
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{
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if ($closure) {
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call_user_func_array($closure, [ & $this->query]);
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}
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return $this->relation($subRelation)->select();
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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 $joinType JOIN类型
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* @return Query
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*/
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public function has($operator = '>=', $count = 1, $id = '*', $joinType = 'INNER')
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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 $fields 字段
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* @return Query
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*/
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public function hasWhere($where = [], $fields = null)
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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 string $subRelation 子关联名
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* @param \Closure $closure 闭包
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* @return void
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*/
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public function eagerlyResultSet(&$resultSet, $relation, $subRelation, $closure)
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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 string $subRelation 子关联名
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* @param \Closure $closure 闭包
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* @return void
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*/
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public function eagerlyResult(&$result, $relation, $subRelation, $closure)
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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 $closure 闭包
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* @return integer
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*/
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public function relationCount($result, $closure)
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{}
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/**
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* 创建关联统计子查询
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* @access public
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* @param \Closure $closure 闭包
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* @param string $name 统计数据别名
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* @return string
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*/
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public function getRelationCountQuery($closure, &$name = null)
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{
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throw new Exception('relation not support: withCount');
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}
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/**
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* 执行基础查询（进执行一次）
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* @access protected
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* @return void
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*/
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protected function baseQuery()
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{
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if (empty($this->baseQuery) && $this->parent->getData()) {
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$through = $this->through;
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$alias = Loader::parseName(basename(str_replace('\\', '/', $this->model)));
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$throughTable = $through::getTable();
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$pk = (new $through)->getPk();
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$throughKey = $this->throughKey;
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$modelTable = $this->parent->getTable();
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$this->query->field($alias . '.*')->alias($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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