审查视图

simplewind/thinkphp/library/think/model/relation/BelongsTo.php 7.7 KB
xiaohu authored
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\model\relation;

use think\db\Query;
use think\Loader;
use think\Model;

class BelongsTo extends OneToOne
{
    /**
     * 构造函数
     * @access public
     * @param Model  $parent 上级模型对象
     * @param string $model 模型名
     * @param string $foreignKey 关联外键
     * @param string $localKey 关联主键
     * @param string $joinType JOIN类型
     * @param string $relation  关联名
     */
    public function __construct(Model $parent, $model, $foreignKey, $localKey, $joinType = 'INNER', $relation = null)
    {
        $this->parent     = $parent;
        $this->model      = $model;
        $this->foreignKey = $foreignKey;
        $this->localKey   = $localKey;
        $this->joinType   = $joinType;
        $this->query      = (new $model)->db();
        $this->relation   = $relation;
    }

    /**
     * 延迟获取关联数据
     * @param string   $subRelation 子关联名
     * @param \Closure $closure     闭包查询条件
     * @access public
     * @return array|false|\PDOStatement|string|Model
     */
    public function getRelation($subRelation = '', $closure = null)
    {
        $foreignKey = $this->foreignKey;
        if ($closure) {
            call_user_func_array($closure, [ & $this->query]);
        }
        $relationModel = $this->query
            ->removeWhereField($this->localKey)
            ->where($this->localKey, $this->parent->$foreignKey)
            ->relation($subRelation)
            ->find();

        if ($relationModel) {
            $relationModel->setParent(clone $this->parent);
        }

        return $relationModel;
    }

    /**
     * 根据关联条件查询当前模型
     * @access public
     * @param string  $operator 比较操作符
     * @param integer $count    个数
     * @param string  $id       关联表的统计字段
     * @return Query
     */
    public function has($operator = '>=', $count = 1, $id = '*')
    {
        return $this->parent;
    }

    /**
     * 根据关联条件查询当前模型
     * @access public
     * @param  mixed  $where 查询条件(数组或者闭包)
     * @param  mixed  $fields   字段
     * @return Query
     */
    public function hasWhere($where = [], $fields = null)
    {
        $table    = $this->query->getTable();
        $model    = basename(str_replace('\\', '/', get_class($this->parent)));
        $relation = basename(str_replace('\\', '/', $this->model));

        if (is_array($where)) {
            foreach ($where as $key => $val) {
                if (false === strpos($key, '.')) {
                    $where[$relation . '.' . $key] = $val;
                    unset($where[$key]);
                }
            }
        }
        $fields = $this->getRelationQueryFields($fields, $model);

        return $this->parent->db()->alias($model)
            ->field($fields)
            ->join([$table => $relation], $model . '.' . $this->foreignKey . '=' . $relation . '.' . $this->localKey, $this->joinType)
            ->where($where);
    }

    /**
     * 预载入关联查询(数据集)
     * @access public
     * @param array     $resultSet 数据集
     * @param string    $relation 当前关联名
     * @param string    $subRelation 子关联名
     * @param \Closure  $closure 闭包
     * @return void
     */
    protected function eagerlySet(&$resultSet, $relation, $subRelation, $closure)
    {
        $localKey   = $this->localKey;
        $foreignKey = $this->foreignKey;

        $range = [];
        foreach ($resultSet as $result) {
            // 获取关联外键列表
            if (isset($result->$foreignKey)) {
                $range[] = $result->$foreignKey;
            }
        }

        if (!empty($range)) {
            $this->query->removeWhereField($localKey);
            $data = $this->eagerlyWhere($this->query, [
                $localKey => [
                    'in',
                    $range,
                ],
            ], $localKey, $relation, $subRelation, $closure);
            // 关联属性名
            $attr = Loader::parseName($relation);
            // 关联数据封装
            foreach ($resultSet as $result) {
                // 关联模型
                if (!isset($data[$result->$foreignKey])) {
                    $relationModel = null;
                } else {
                    $relationModel = $data[$result->$foreignKey];
                    $relationModel->setParent(clone $result);
                    $relationModel->isUpdate(true);
                }

                if (!empty($this->bindAttr)) {
                    // 绑定关联属性
                    $this->bindAttr($relationModel, $result, $this->bindAttr);
                } else {
                    // 设置关联属性
                    $result->setRelation($attr, $relationModel);
                }
            }
        }
    }

    /**
     * 预载入关联查询(数据)
     * @access public
     * @param Model     $result 数据对象
     * @param string    $relation 当前关联名
     * @param string    $subRelation 子关联名
     * @param \Closure  $closure 闭包
     * @return void
     */
    protected function eagerlyOne(&$result, $relation, $subRelation, $closure)
    {
        $localKey   = $this->localKey;
        $foreignKey = $this->foreignKey;
        $this->query->removeWhereField($localKey);
        $data = $this->eagerlyWhere($this->query, [$localKey => $result->$foreignKey], $localKey, $relation, $subRelation, $closure);
        // 关联模型
        if (!isset($data[$result->$foreignKey])) {
            $relationModel = null;
        } else {
            $relationModel = $data[$result->$foreignKey];
            $relationModel->setParent(clone $result);
            $relationModel->isUpdate(true);
        }
        if (!empty($this->bindAttr)) {
            // 绑定关联属性
            $this->bindAttr($relationModel, $result, $this->bindAttr);
        } else {
            // 设置关联属性
            $result->setRelation(Loader::parseName($relation), $relationModel);
        }
    }

    /**
     * 添加关联数据
     * @access public
     * @param Model $model       关联模型对象
     * @return Model
     */
    public function associate($model)
    {
        $foreignKey = $this->foreignKey;
        $pk         = $model->getPk();

        $this->parent->setAttr($foreignKey, $model->$pk);
        $this->parent->save();

        return $this->parent->setRelation($this->relation, $model);
    }

    /**
     * 注销关联数据
     * @access public
     * @return Model
     */
    public function dissociate()
    {
        $foreignKey = $this->foreignKey;

        $this->parent->setAttr($foreignKey, null);
        $this->parent->save();

        return $this->parent->setRelation($this->relation, null);
    }

    /**
     * 执行基础查询(仅执行一次)
     * @access protected
     * @return void
     */
    protected function baseQuery()
    {
        if (empty($this->baseQuery)) {
            if (isset($this->parent->{$this->foreignKey})) {
                // 关联查询带入关联条件
                $this->query->where($this->localKey, '=', $this->parent->{$this->foreignKey});
            }

            $this->baseQuery = true;
        }
    }
}