244 lines
7.7 KiB
PHP
244 lines
7.7 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\Loader;
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use think\Model;
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class BelongsTo extends OneToOne
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{
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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 $foreignKey 关联外键
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* @param string $localKey 关联主键
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* @param string $joinType JOIN类型
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* @param string $relation 关联名
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*/
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public function __construct(Model $parent, $model, $foreignKey, $localKey, $joinType = 'INNER', $relation = null)
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{
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$this->parent = $parent;
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$this->model = $model;
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$this->foreignKey = $foreignKey;
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$this->localKey = $localKey;
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$this->joinType = $joinType;
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$this->query = (new $model)->db();
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$this->relation = $relation;
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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 $closure 闭包查询条件
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* @access public
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* @return array|false|\PDOStatement|string|Model
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*/
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public function getRelation($subRelation = '', $closure = null)
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{
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$foreignKey = $this->foreignKey;
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if ($closure) {
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call_user_func_array($closure, [ & $this->query]);
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}
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$relationModel = $this->query
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->removeWhereField($this->localKey)
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->where($this->localKey, $this->parent->$foreignKey)
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->relation($subRelation)
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->find();
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if ($relationModel) {
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$relationModel->setParent(clone $this->parent);
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}
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return $relationModel;
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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 $id 关联表的统计字段
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* @return Query
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*/
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public function has($operator = '>=', $count = 1, $id = '*')
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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 = [], $fields = null)
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{
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$table = $this->query->getTable();
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$model = basename(str_replace('\\', '/', get_class($this->parent)));
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$relation = basename(str_replace('\\', '/', $this->model));
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if (is_array($where)) {
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foreach ($where as $key => $val) {
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if (false === strpos($key, '.')) {
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$where[$relation . '.' . $key] = $val;
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unset($where[$key]);
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}
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}
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}
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$fields = $this->getRelationQueryFields($fields, $model);
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return $this->parent->db()->alias($model)
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->field($fields)
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->join([$table => $relation], $model . '.' . $this->foreignKey . '=' . $relation . '.' . $this->localKey, $this->joinType)
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->where($where);
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}
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/**
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* 预载入关联查询（数据集）
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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 $closure 闭包
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* @return void
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*/
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protected function eagerlySet(&$resultSet, $relation, $subRelation, $closure)
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{
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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$range = [];
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foreach ($resultSet as $result) {
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// 获取关联外键列表
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if (isset($result->$foreignKey)) {
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$range[] = $result->$foreignKey;
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}
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}
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if (!empty($range)) {
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$this->query->removeWhereField($localKey);
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$data = $this->eagerlyWhere($this->query, [
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$localKey => [
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'in',
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$range,
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],
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], $localKey, $relation, $subRelation, $closure);
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// 关联属性名
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$attr = Loader::parseName($relation);
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// 关联数据封装
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foreach ($resultSet as $result) {
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// 关联模型
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if (!isset($data[$result->$foreignKey])) {
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$relationModel = null;
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} else {
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$relationModel = $data[$result->$foreignKey];
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$relationModel->setParent(clone $result);
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$relationModel->isUpdate(true);
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}
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if (!empty($this->bindAttr)) {
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// 绑定关联属性
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$this->bindAttr($relationModel, $result, $this->bindAttr);
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} else {
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// 设置关联属性
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$result->setRelation($attr, $relationModel);
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}
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}
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}
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}
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/**
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* 预载入关联查询（数据）
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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 $closure 闭包
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* @return void
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*/
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protected function eagerlyOne(&$result, $relation, $subRelation, $closure)
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{
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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$this->query->removeWhereField($localKey);
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$data = $this->eagerlyWhere($this->query, [$localKey => $result->$foreignKey], $localKey, $relation, $subRelation, $closure);
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// 关联模型
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if (!isset($data[$result->$foreignKey])) {
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$relationModel = null;
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} else {
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$relationModel = $data[$result->$foreignKey];
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$relationModel->setParent(clone $result);
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$relationModel->isUpdate(true);
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}
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if (!empty($this->bindAttr)) {
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// 绑定关联属性
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$this->bindAttr($relationModel, $result, $this->bindAttr);
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} else {
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// 设置关联属性
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$result->setRelation(Loader::parseName($relation), $relationModel);
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}
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}
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/**
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* 添加关联数据
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* @access public
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* @param Model $model 关联模型对象
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* @return Model
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*/
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public function associate($model)
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{
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$foreignKey = $this->foreignKey;
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$pk = $model->getPk();
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$this->parent->setAttr($foreignKey, $model->$pk);
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$this->parent->save();
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return $this->parent->setRelation($this->relation, $model);
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}
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/**
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* 注销关联数据
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* @access public
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* @return Model
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*/
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public function dissociate()
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{
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$foreignKey = $this->foreignKey;
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$this->parent->setAttr($foreignKey, null);
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$this->parent->save();
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return $this->parent->setRelation($this->relation, null);
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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()
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{
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if (empty($this->baseQuery)) {
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if (isset($this->parent->{$this->foreignKey})) {
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// 关联查询带入关联条件
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$this->query->where($this->localKey, '=', $this->parent->{$this->foreignKey});
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}
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$this->baseQuery = true;
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}
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}
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}
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