thinkphp/library/think/db/Builder.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\Exception;

abstract class Builder
{
    // connection对象实例
    protected $connection;

    // 查询表达式映射
    protected $exp = ['EQ' => '=', 'NEQ' => '<>', 'GT' => '>', 'EGT' => '>=', 'LT' => '<', 'ELT' => '<=', 'NOTLIKE' => 'NOT LIKE', 'NOTIN' => 'NOT IN', 'NOTBETWEEN' => 'NOT BETWEEN', 'NOTEXISTS' => 'NOT EXISTS', 'NOTNULL' => 'NOT NULL', 'NOTBETWEEN TIME' => 'NOT BETWEEN TIME'];

    // 查询表达式解析
    protected $parser = [
        'parseCompare'     => ['=', '<>', '>', '>=', '<', '<='],
        'parseLike'        => ['LIKE', 'NOT LIKE'],
        'parseBetween'     => ['NOT BETWEEN', 'BETWEEN'],
        'parseIn'          => ['NOT IN', 'IN'],
        'parseExp'         => ['EXP'],
        'parseNull'        => ['NOT NULL', 'NULL'],
        'parseBetweenTime' => ['BETWEEN TIME', 'NOT BETWEEN TIME'],
        'parseTime'        => ['< TIME', '> TIME', '<= TIME', '>= TIME'],
        'parseExists'      => ['NOT EXISTS', 'EXISTS'],
        'parseColumn'      => ['COLUMN'],
    ];

    // SQL表达式
    protected $selectSql = 'SELECT%DISTINCT% %FIELD% FROM %TABLE%%FORCE%%JOIN%%WHERE%%GROUP%%HAVING%%UNION%%ORDER%%LIMIT% %LOCK%%COMMENT%';

    protected $insertSql = '%INSERT% INTO %TABLE% (%FIELD%) VALUES (%DATA%) %COMMENT%';

    protected $insertAllSql = '%INSERT% INTO %TABLE% (%FIELD%) %DATA% %COMMENT%';

    protected $updateSql = 'UPDATE %TABLE% SET %SET%%JOIN%%WHERE%%ORDER%%LIMIT% %LOCK%%COMMENT%';

    protected $deleteSql = 'DELETE FROM %TABLE%%USING%%JOIN%%WHERE%%ORDER%%LIMIT% %LOCK%%COMMENT%';

    /**
     * 架构函数
     * @access public
     * @param  Connection    $connection 数据库连接对象实例
     */
    public function __construct(Connection $connection)
    {
        $this->connection = $connection;
    }

    /**