mirror of
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391 lines
13 KiB
PHP
391 lines
13 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) 2006~2017 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\Pivot;
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use think\model\Relation;
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class BelongsToMany extends Relation
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{
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// 中间表模型
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protected $middle;
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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 $table 中间表名
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* @param string $foreignKey 关联模型外键
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* @param string $localKey 当前模型关联键
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*/
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public function __construct(Model $parent, $model, $table, $foreignKey, $localKey)
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{
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$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->middle = $table;
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$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 = '', $closure = null)
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{
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$foreignKey = $this->foreignKey;
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$localKey = $this->localKey;
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$middle = $this->middle;
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if ($closure) {
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call_user_func_array($closure, [ & $this->query]);
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}
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// 关联查询
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$pk = $this->parent->getPk();
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$condition['pivot.' . $localKey] = $this->parent->$pk;
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$result = $this->belongsToManyQuery($middle, $foreignKey, $localKey, $condition)->relation($subRelation)->select();
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foreach ($result as $set) {
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$pivot = [];
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foreach ($set->getData() as $key => $val) {
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if (strpos($key, '__')) {
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list($name, $attr) = explode('__', $key, 2);
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if ('pivot' == $name) {
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$pivot[$attr] = $val;
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unset($set->$key);
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}
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}
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}
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$set->pivot = new Pivot($pivot, $this->middle);
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}
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return $result;
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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 $where 查询条件（数组或者闭包）
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* @return Query
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*/
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public function hasWhere($where = [])
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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（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 $closure 闭包
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* @return void
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*/
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public function eagerlyResultSet(&$resultSet, $relation, $subRelation, $closure)
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{
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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$pk = $resultSet[0]->getPk();
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$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->$pk)) {
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$range[] = $result->$pk;
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}
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}
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if (!empty($range)) {
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// 查询关联数据
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$data = $this->eagerlyManyToMany([
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'pivot.' . $localKey => [
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'in',
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$range,
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],
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], $relation, $subRelation);
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// 关联属性名
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$attr = Loader::parseName($relation);
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// 关联数据封装
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foreach ($resultSet as $result) {
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if (!isset($data[$result->$pk])) {
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$data[$result->$pk] = [];
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}
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$result->setAttr($attr, $this->resultSetBuild($data[$result->$pk]));
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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（单个数据）
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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 $closure 闭包
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* @return void
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*/
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public function eagerlyResult(&$result, $relation, $subRelation, $closure)
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{
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$pk = $result->getPk();
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if (isset($result->$pk)) {
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$pk = $result->$pk;
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// 查询管理数据
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$data = $this->eagerlyManyToMany(['pivot.' . $this->localKey => $pk], $relation, $subRelation);
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// 关联数据封装
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if (!isset($data[$pk])) {
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$data[$pk] = [];
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}
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$result->setAttr(Loader::parseName($relation), $this->resultSetBuild($data[$pk]));
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}
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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, $closure)
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{
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$pk = $result->getPk();
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$count = 0;
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if (isset($result->$pk)) {
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$pk = $result->$pk;
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$count = $this->belongsToManyQuery($this->middle, $this->foreignKey, $this->localKey, ['pivot.' . $this->localKey => $pk])->count();
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}
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return $count;
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}
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/**
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* 获取关联统计子查询
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* @access public
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* @param \Closure $closure 闭包
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* @return string
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*/
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public function getRelationCountQuery($closure)
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{
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return $this->belongsToManyQuery($this->middle, $this->foreignKey, $this->localKey, [
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'pivot.' . $this->localKey => [
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'exp',
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'=' . $this->parent->getTable() . '.' . $this->parent->getPk(),
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],
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])->fetchSql()->count();
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}
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/**
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* 多对多 关联模型预查询
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* @access public
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* @param array $where 关联预查询条件
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* @param string $relation 关联名
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* @param string $subRelation 子关联
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* @return array
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*/
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protected function eagerlyManyToMany($where, $relation, $subRelation = '')
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{
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// 预载入关联查询 支持嵌套预载入
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$list = $this->belongsToManyQuery($this->middle, $this->foreignKey, $this->localKey, $where)->with($subRelation)->select();
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// 组装模型数据
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$data = [];
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foreach ($list as $set) {
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$pivot = [];
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foreach ($set->getData() as $key => $val) {
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if (strpos($key, '__')) {
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list($name, $attr) = explode('__', $key, 2);
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if ('pivot' == $name) {
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$pivot[$attr] = $val;
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unset($set->$key);
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}
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}
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}
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$set->pivot = new Pivot($pivot, $this->middle);
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$data[$pivot[$this->localKey]][] = $set;
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}
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return $data;
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}
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/**
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* BELONGS TO MANY 关联查询
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* @access public
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* @param string $table 中间表名
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* @param string $foreignKey 关联模型关联键
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* @param string $localKey 当前模型关联键
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* @param array $condition 关联查询条件
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* @return Query
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*/
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protected function belongsToManyQuery($table, $foreignKey, $localKey, $condition = [])
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{
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// 关联查询封装
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$tableName = $this->query->getTable();
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$relationFk = $this->query->getPk();
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return $this->query->field($tableName . '.*')
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->field(true, false, $table, 'pivot', 'pivot__')
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->join($table . ' pivot', 'pivot.' . $foreignKey . '=' . $tableName . '.' . $relationFk)
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->where($condition);
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}
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/**
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* 保存（新增）当前关联数据对象
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* @access public
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* @param mixed $data 数据 可以使用数组 关联模型对象 和 关联对象的主键
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* @param array $pivot 中间表额外数据
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* @return integer
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*/
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public function save($data, array $pivot = [])
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{
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// 保存关联表/中间表数据
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return $this->attach($data, $pivot);
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}
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/**
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* 批量保存当前关联数据对象
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* @access public
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* @param array $dataSet 数据集
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* @param array $pivot 中间表额外数据
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* @param bool $samePivot 额外数据是否相同
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* @return integer
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*/
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public function saveAll(array $dataSet, array $pivot = [], $samePivot = false)
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{
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$result = false;
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foreach ($dataSet as $key => $data) {
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if (!$samePivot) {
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$pivotData = isset($pivot[$key]) ? $pivot[$key] : [];
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} else {
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$pivotData = $pivot;
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}
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$result = $this->attach($data, $pivotData);
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}
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return $result;
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}
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/**
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* 附加关联的一个中间表数据
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* @access public
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* @param mixed $data 数据 可以使用数组、关联模型对象 或者 关联对象的主键
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* @param array $pivot 中间表额外数据
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* @return array|Pivot
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* @throws Exception
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*/
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public function attach($data, $pivot = [])
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{
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if (is_array($data)) {
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if (key($data) === 0) {
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$id = $data;
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} else {
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// 保存关联表数据
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$model = new $this->model;
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$model->save($data);
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$id = $model->getLastInsID();
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}
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} elseif (is_numeric($data) || is_string($data)) {
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// 根据关联表主键直接写入中间表
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$id = $data;
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} elseif ($data instanceof Model) {
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// 根据关联表主键直接写入中间表
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$relationFk = $data->getPk();
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$id = $data->$relationFk;
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}
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if ($id) {
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// 保存中间表数据
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$pk = $this->parent->getPk();
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$pivot[$this->localKey] = $this->parent->$pk;
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$ids = (array) $id;
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foreach ($ids as $id) {
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$pivot[$this->foreignKey] = $id;
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$this->query->table($this->middle)->insert($pivot, true);
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$result[] = new Pivot($pivot, $this->middle);
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}
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if (count($result) == 1) {
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// 返回中间表模型对象
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$result = $result[0];
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}
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return $result;
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} else {
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throw new Exception('miss relation data');
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}
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}
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/**
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* 解除关联的一个中间表数据
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* @access public
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* @param integer|array $data 数据 可以使用关联对象的主键
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* @param bool $relationDel 是否同时删除关联表数据
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* @return integer
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*/
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public function detach($data = null, $relationDel = false)
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{
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if (is_array($data)) {
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$id = $data;
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} elseif (is_numeric($data) || is_string($data)) {
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// 根据关联表主键直接写入中间表
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$id = $data;
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} elseif ($data instanceof Model) {
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// 根据关联表主键直接写入中间表
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$relationFk = $data->getPk();
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$id = $data->$relationFk;
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}
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// 删除中间表数据
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$pk = $this->parent->getPk();
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$pivot[$this->localKey] = $this->parent->$pk;
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if (isset($id)) {
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$pivot[$this->foreignKey] = is_array($id) ? ['in', $id] : $id;
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}
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$this->query->table($this->middle)->where($pivot)->delete();
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// 删除关联表数据
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if (isset($id) && $relationDel) {
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$model = $this->model;
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$model::destroy($id);
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}
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}
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/**
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* 执行基础查询（进执行一次）
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* @access protected
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* @return void
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*/
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protected function baseQuery()
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{
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if (empty($this->baseQuery)) {
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$pk = $this->parent->getPk();
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$this->query->join($this->middle . ' pivot', 'pivot.' . $this->foreignKey . '=' . $this->query->getTable() . '.' . $this->query->getPk())->where('pivot.' . $this->localKey, $this->parent->$pk);
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$this->baseQuery = true;
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}
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}
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}
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