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\App;
use think\Cache;
use think\Collection;
use think\Config;
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\Relation;
use think\model\relation\OneToOne;
use think\Paginator;

class Query
{
    // 数据库Connection对象实例
    protected $connection;
    // 数据库Builder对象实例
    protected $builder;
    // 当前模型类名称
    protected $model;
    // 当前数据表名称（含前缀）
    protected $table = '';
    // 当前数据表名称（不含前缀）
    protected $name = '';
    // 当前数据表主键
    protected $pk;
    // 当前数据表前缀
    protected $prefix = '';
    // 查询参数
    protected $options = [];
    // 参数绑定
    protected $bind = [];
    // 数据表信息
    protected static $info = [];
    // 回调事件
    private static $event = [];
    // 读取主库
    protected static $readMaster = [];

    /**
     * 构造函数