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345 lines
11 KiB
PHP
345 lines
11 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) 2006~2016 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;
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use think\Db;
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class Relation
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{
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const HAS_ONE = 1;
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const HAS_MANY = 2;
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const BELONGS_TO = 3;
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const BELONGS_TO_MANY = 4;
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// 父模型
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protected $parent;
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// 当前的模型类
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protected $model;
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// 中间表模型
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protected $middle;
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// 当前关联类型
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protected $type;
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// 关联外键
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protected $foreignKey;
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// 关联键
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protected $localKey;
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// 是否预载入
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protected $eagerly = false;
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/**
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* 架构函数
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* @access public
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* @param \think\Model $model 上级模型对象
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*/
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public function __construct($model)
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{
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$this->parent = $model;
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}
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/**
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* 获取当前关联信息
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* @access public
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* @param string $name 关联信息
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* @return array|string|integer
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*/
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public function getRelationInfo($name = '')
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{
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$info = [
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'type' => $this->type,
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'model' => $this->model,
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'middle' => $this->middle,
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'foreignKey' => $this->foreignKey,
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'localKey' => $this->localKey,
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];
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return $name ? $info[$name] : $info;
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}
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// 获取关联数据
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public function getRelation($relation)
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{
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// 执行关联定义方法
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$db = $this->parent->$relation();
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dump($this->type);
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// 判断关联类型执行查询
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switch ($this->type) {
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case self::HAS_ONE:
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case self::BELONGS_TO:echo 'one';
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$result = $db->find();
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break;
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case self::HAS_MANY:
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case self::BELONGS_TO_MANY:
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$result = $db->select();
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break;
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default:
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// 直接返回
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$result = $db;
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}
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return $result;
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}
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/**
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* 预载入关联查询 返回数据集
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* @access public
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* @param array $resultSet 数据集
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* @param string $relation 关联名
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* @return array
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*/
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public function eagerlyResultSet($resultSet, $relation)
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{
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$this->eagerly = true;
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$relations = is_string($relation) ? explode(',', $relation) : $relation;
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foreach ($relations as $relation) {
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$subRelation = '';
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if (strpos($relation, '.')) {
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list($relation, $subRelation) = explode('.', $relation);
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}
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// 执行关联方法
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$model = $this->parent->$relation();
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// 获取关联信息
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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switch ($this->type) {
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case self::HAS_ONE:
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case self::BELONGS_TO:
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foreach ($resultSet as $result) {
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// 模型关联组装
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$this->modelRelationBuild($model, $relation, $result);
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}
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break;
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case self::HAS_MANY:
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case self::BELONGS_TO_MANY:
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$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->$localKey)) {
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$range[] = $result->$localKey;
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}
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}
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if (!empty($range)) {
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$data = $this->modelRelationQuery($model, [$foreignKey => ['in', $range]], $relation, $subRelation);
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// 关联数据封装
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foreach ($resultSet as $result) {
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if (isset($data[$result->$localKey])) {
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$result->__set($relation, $data[$result->$localKey]);
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} else {
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$result->__set($relation, []);
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}
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}
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}
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break;
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}
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$this->relation = [];
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}
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$this->eagerly = false;
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return $resultSet;
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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 $relation 关联名
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* @return \think\Model
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*/
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public function eagerlyResult($result, $relation)
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{
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$this->eagerly = true;
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$relations = is_string($relation) ? explode(',', $relation) : $relation;
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foreach ($relations as $relation) {
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$subRelation = '';
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if (strpos($relation, '.')) {
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list($relation, $subRelation) = explode('.', $relation);
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}
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// 执行关联方法
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$model = $this->parent->$relation();
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$localKey = $this->localKey;
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$foreignKey = $this->foreignKey;
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switch ($this->type) {
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case self::HAS_ONE:
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case self::BELONGS_TO:
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// 模型关联组装
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$this->match($model, $relation, $result);
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break;
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case self::HAS_MANY:
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case self::BELONGS_TO_MANY:
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if (isset($result->$localKey)) {
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$data = $this->eagerly($model, [$foreignKey => $result->$localKey], $relation, $subRelation);
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// 关联数据封装
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if (!isset($data[$result->$localKey])) {
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$data[$result->$localKey] = [];
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}
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$result->__set($relation, $data[$result->$localKey]);
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}
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break;
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}
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}
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$this->eagerly = false;
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return $result;
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}
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/**
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* 一对一 关联模型预查询拼装
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* @access public
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* @param string $model 模型名称
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* @param string $relation 关联名
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* @param Model $result 模型对象实例
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* @return void
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*/
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protected function match($model, $relation, &$result)
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{
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$modelName = strtolower(basename(str_replace('\\', '/', $model)));
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// 重新组装模型数据
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foreach ($result->toArray() as $key => $val) {
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if (strpos($key, '__')) {
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list($name, $attr) = explode('__', $key);
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if ($name == $modelName) {
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$list[$name][$attr] = $val;
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unset($result->$key);
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}
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}
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}
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if (!isset($list[$modelName])) {
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// 设置关联模型属性
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$list[$modelName] = [];
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}
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$result->__set($relation, new $model($list[$modelName]));
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}
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/**
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* 一对多 关联模型预查询
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* @access public
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* @param string $model 模型名称
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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 $subRelation 子关联
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* @return void
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*/
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protected function eagerly($model, $where, $relation, $subRelation = '')
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{
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$foreignKey = $this->foreignKey;
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// 预载入关联查询 支持嵌套预载入
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$list = $model::where($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 $set) {
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$data[$set->$foreignKey][] = $set;
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}
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return $data;
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}
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/**
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* HAS ONE 关联定义
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* @access public
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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 $localKey 关联主键
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* @return \think\db\Driver|string
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*/
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public function hasOne($model, $foreignKey = '', $localKey = '')
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{
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$this->type = self::HAS_ONE;
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$this->model = $model;
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$this->foreignKey = $foreignKey;
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$this->localKey = $localKey;
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if (!$this->eagerly && isset($this->parent->$localKey)) {
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// 关联查询封装
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return $model::where($foreignKey, $this->parent->$localKey);
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} else {
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// 预载入封装
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return $model;
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}
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}
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/**
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* BELONGS TO 关联定义
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* @access public
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* @param string $model 模型名
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* @param string $localKey 关联主键
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* @param string $foreignKey 关联外键
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* @return \think\db\Driver|string
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*/
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public function belongsTo($model, $localKey = '', $foreignKey = '')
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{
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// 记录当前关联信息
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$this->type = self::BELONGS_TO;
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$this->model = $model;
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$this->foreignKey = $foreignKey;
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$this->localKey = $localKey;
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if (!$this->eagerly && isset($this->parent->$localKey)) {
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// 关联查询封装
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return $model::where($foreignKey, $this->parent->$localKey);
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} else {
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// 预载入封装
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return $model;
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}
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}
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/**
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* HAS MANY 关联定义
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* @access public
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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 $localKey 关联主键
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* @return \think\db\Driver|string
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*/
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public function hasMany($model, $foreignKey = '', $localKey = '')
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{
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// 记录当前关联信息
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$this->type = self::HAS_MANY;
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$this->model = $model;
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$this->foreignKey = $foreignKey;
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$this->localKey = $localKey;
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if (!$this->eagerly && isset($this->parent->$localKey)) {
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// 关联查询封装
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return $model::where($foreignKey, $this->parent->$localKey);
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} else {
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// 预载入封装
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return $model;
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}
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}
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/**
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* BELONGS TO MANY 关联定义
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* @access public
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* @param string $model 模型名
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* @param string $localKey 关联主键
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* @param string $foreignKey 关联外键
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* @return \think\db\Driver|string
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*/
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public function belongsToMany($model, $localKey = '', $foreignKey = '')
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{
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// 记录当前关联信息
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$this->type = self::BELONGS_TO_MANY;
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$this->model = $model;
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$this->foreignKey = $foreignKey;
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$this->localKey = $localKey;
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if (!$this->eagerly && isset($this->parent->$localKey)) {
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// 关联查询封装
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return $model::where($foreignKey, $this->parent->$localKey);
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} else {
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// 预载入封装
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return $model;
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}
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}
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}
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