thinkphp/library/think/db/Query.php

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<?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\db;

use PDO;
use think\Collection;
use think\Container;
use think\Db;
use think\db\exception\BindParamException;
use think\db\exception\DataNotFoundException;
use think\db\exception\ModelNotFoundException;
use think\Exception;
use think\exception\DbException;
use think\exception\PDOException;
use think\Loader;
use think\Model;
use think\model\Collection as ModelCollection;
use think\model\Relation;
use think\model\relation\OneToOne;
use think\Paginator;

class Query
{
    /**
     * 当前数据库连接对象
     * @var Connection
     */
    protected $connection;

    /**
     * 当前模型对象
     * @var Model
     */
    protected $model;

    /**
     * 当前数据表名称（不含前缀）
     * @var string
     */
    protected $name = '';

    /**
     * 当前数据表主键
     * @var string|array
     */
    protected $pk;

    /**
     * 当前数据表前缀
     * @var string
     */