vendor/topthink/think-orm/src/db/Fetch.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\db;

use think\db\exception\DbException as Exception;
use think\helper\Str;

/**
 * SQL获取类
 */
class Fetch
{
    /**
     * 查询对象
     * @var Query
     */
    protected $query;

    /**
     * Connection对象
     * @var Connection
     */
    protected $connection;

    /**
     * Builder对象
     * @var Builder
     */
    protected $builder;

    /**
     * 创建一个查询SQL获取对象
     *
     * @param  Query    $query      查询对象
     */
    public function __construct(Query $query)
    {
        $this->query      = $query;
        $this->connection = $query->getConnection();
        $this->builder    = $this->connection->getBuilder();
    }

    /**
     * 聚合查询
     * @access protected
     * @param  string $aggregate    聚合方法
     * @param  string $field        字段名
     * @return string
     */
    protected function aggregate(string $aggregate, string $field): string