thinkphp/library/think/db/connector/Mysql.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\connector;

use PDO;
use think\db\Connection;
use think\Log;

/**
 * mysql数据库驱动
 */
class Mysql extends Connection
{

    protected $builder = '\\think\\db\\builder\\Mysql';

    /**
     * 解析pdo连接的dsn信息
     * @access protected
     * @param array $config 连接信息
     * @return string
     */
    protected function parseDsn($config)
    {
        if (!empty($config['socket'])) {
            $dsn = 'mysql:unix_socket=' . $config['socket'];
        } elseif (!empty($config['hostport'])) {
            $dsn = 'mysql:host=' . $config['hostname'] . ';port=' . $config['hostport'];
        } else {
            $dsn = 'mysql:host=' . $config['hostname'];
        }
        $dsn .= ';dbname=' . $config['database'];

        if (!empty($config['charset'])) {
            $dsn .= ';charset=' . $config['charset'];
        }
        return $dsn;
    }

    /**
     * 取得数据表的字段信息
     * @access public
     * @param string $tableName
     * @return array
     */
    public function getFields($tableName)
    {
        list($tableName) = explode(' ', $tableName);
        if (false === strpos($tableName, '`')) {
            if (strpos($tableName, '.')) {
                $tableName = str_replace('.', '`.`', $tableName);