CodeIgniter 正在复制 SQL 查询 [重复]答案

【问题标题】：CodeIgniter is duplicating the SQL queries [duplicate]CodeIgniter 正在复制 SQL 查询 [重复]
【发布时间】：2013-11-01 12:40:41
【问题描述】：

我正在使用 CodeIgniter 进行开发，一段时间后我注意到所有查询都被执行了两次，如下面的 mySQL 日志所示：

           55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=95
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=95
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=95
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=95
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=95
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=95
       55 Query SELECT addon_name FROM addon WHERE addon_id='1' OR addon_id='4'
       55 Query SELECT addon_name FROM addon WHERE addon_id='1' OR addon_id='4'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=95
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=95
       55 Query SELECT skill_name FROM skill WHERE skill_id='2' OR skill_id='4' OR skill_id='13'
       55 Query SELECT skill_name FROM skill WHERE skill_id='2' OR skill_id='4' OR skill_id='13'
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=9
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=9
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=9
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=9
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=9
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=9
       55 Query SELECT addon_name FROM addon WHERE addon_id='1'
       55 Query SELECT addon_name FROM addon WHERE addon_id='1'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=9
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=9
       55 Query SELECT skill_name FROM skill WHERE skill_id='1' OR skill_id='4'
       55 Query SELECT skill_name FROM skill WHERE skill_id='1' OR skill_id='4'
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=16
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=16
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=16
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=16
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=16
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=16
       55 Query SELECT addon_name FROM addon WHERE addon_id='2' OR addon_id='4'
       55 Query SELECT addon_name FROM addon WHERE addon_id='2' OR addon_id='4'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=16
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=16
       55 Query SELECT skill_name FROM skill WHERE skill_id='16'
       55 Query SELECT skill_name FROM skill WHERE skill_id='16'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=68
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=68
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=68
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=68
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=68
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=68
       55 Query SELECT addon_name FROM addon WHERE addon_id='7'
       55 Query SELECT addon_name FROM addon WHERE addon_id='7'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=68
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=68
       55 Query SELECT skill_name FROM skill WHERE skill_id='1' OR skill_id='3'
       55 Query SELECT skill_name FROM skill WHERE skill_id='1' OR skill_id='3'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=79
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=79
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=79
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=79
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=79
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=79
       55 Query SELECT addon_name FROM addon WHERE addon_id='4'
       55 Query SELECT addon_name FROM addon WHERE addon_id='4'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=79
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=79
       55 Query SELECT skill_name FROM skill WHERE skill_id='2' OR skill_id='4' OR skill_id='6'
       55 Query SELECT skill_name FROM skill WHERE skill_id='2' OR skill_id='4' OR skill_id='6'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=86
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=86
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=86
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=86
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=86
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=86
       55 Query SELECT addon_name FROM addon WHERE addon_id='2' OR addon_id='3'
       55 Query SELECT addon_name FROM addon WHERE addon_id='2' OR addon_id='3'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=86
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=86
       55 Query SELECT skill_name FROM skill WHERE skill_id='8' OR skill_id='13'
       55 Query SELECT skill_name FROM skill WHERE skill_id='8' OR skill_id='13'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=92
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=92
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=92
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=92
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=92
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=92
       55 Query SELECT addon_name FROM addon WHERE addon_id='3' OR addon_id='4' OR addon_id='5' OR addon_id='8'
       55 Query SELECT addon_name FROM addon WHERE addon_id='3' OR addon_id='4' OR addon_id='5' OR addon_id='8'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=92
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=92
       55 Query SELECT skill_name FROM skill WHERE skill_id='3' OR skill_id='6' OR skill_id='19'
       55 Query SELECT skill_name FROM skill WHERE skill_id='3' OR skill_id='6' OR skill_id='19'
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT user_display FROM user WHERE user_id=2
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=12
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=12
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=12
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=12
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=12
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=12
       55 Query SELECT addon_name FROM addon WHERE addon_id='3' OR addon_id='4' OR addon_id='8'
       55 Query SELECT addon_name FROM addon WHERE addon_id='3' OR addon_id='4' OR addon_id='8'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=12
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=12
       55 Query SELECT skill_name FROM skill WHERE skill_id='11'
       55 Query SELECT skill_name FROM skill WHERE skill_id='11'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=34
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=34
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=34
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=34
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=34
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=34
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=34
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=34
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=34
       55 Query SELECT skill_name FROM skill WHERE skill_id='3'
       55 Query SELECT skill_name FROM skill WHERE skill_id='3'
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT user_display FROM user WHERE user_id=1
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=74
       55 Query SELECT TIMEDIFF(NOW(),contest_create) FROM contest WHERE contest_id=74
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=74
       55 Query SELECT TIMEDIFF(ADDDATE(contest_create, INTERVAL contest_duration DAY),NOW()) FROM contest WHERE contest_id=74
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=74
       55 Query SELECT add_addon_id FROM addon_contest WHERE add_contest_id=74
       55 Query SELECT addon_name FROM addon WHERE addon_id='1'
       55 Query SELECT addon_name FROM addon WHERE addon_id='1'
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=74
       55 Query SELECT required_skill_id FROM skill_contest WHERE required_contest_id=74
       55 Query SELECT skill_name FROM skill WHERE skill_id='2'
       55 Query SELECT skill_name FROM skill WHERE skill_id='2'
       55 Query SELECT skill_name FROM skill WHERE skill_status=2
       55 Query SELECT skill_name FROM skill WHERE skill_status=2
       55 Quit

问题是当一些 INSERT 查询运行时，所有信息都被插入两次，查看查询的顺序我可以得出结论，我没有调用模型两次，但是当我调用 "$this-> db->query($sql)" 这被发送到 MySQL 两次。可能我在 CodeIgniter 中有一些错误的数据库配置，你们有人知道发生了什么吗？

【问题讨论】：

您是否尝试过对模型进行独立调用，该模型会进行虚拟查询，以检查它是否被调用了两次。如果不是，则错误在代码中的某个地方，循环或其他东西进行了双重调用
其实我没有在模型之外尝试过，但是如果代码中有一些额外的调用，日志应该会有所不同。例如，我有一个函数先选择，然后再插入，如果这个函数被调用两次，日志应该是“SELECT INSERT SELECT INSERT”，但日志显示“SELECT SELECT INSERT INSERT”。
你能发布一个被调用两次的模型方法的例子吗？
每次我从 codeigniter 调用这个函数时：“$this->db->query($sql);”。 Codeigniter 运行 $sql 字符串查询两次。但是有一个有趣的事实，如果字符串 $sql 有两个或多个单独的命令，比如：“INSERT INTO user VALUES (1,2,3); INSERT INTO user VALUES (5,4,2);” , Codeigniter 只运行一次。我在想也许这与分号“;”有关，但我不确定。
我打开了另一个问题，实际上是同样的问题：stackoverflow.com/questions/19726961/…

标签： php mysql sql codeigniter

【解决方案1】：

好吧，我发现codeigniter系统内部CI_DB_pdo_driver中的_execute()函数没有正常工作，可能是php版本的问题。无论如何，我将 CodeIgniter 的代码更改为：

    function _execute($sql)
{
    $sql = $this->_prep_query($sql);
    $result_id = $this->conn_id->prepare($sql);
    $result_id->execute();

    if (is_object($result_id))
    {
        if (is_numeric(stripos($sql, 'SELECT')))
        {
            $this->affect_rows = count($result_id->fetchAll());
            $result_id->execute();
        }
        else
        {
            $this->affect_rows = $result_id->rowCount();
        }
    }
    else
    {
        $this->affect_rows = 0;
    }

    return $result_id;
}

到：

    function _execute($sql)
{
    $sql = $this->_prep_query($sql);
    $result_id = $this->conn_id->prepare($sql);
    $result_id->execute();

    if (is_object($result_id))
    {
        if (preg_match('/^\s*"?(SELECT)\s+/i', $sql))
        {
            $this->affect_rows = count($result_id->fetchAll());
            $result_id->execute();
        }
        else
        {
            $this->affect_rows = $result_id->rowCount();
        }
    }
    else
    {
        $this->affect_rows = 0;
    }

    return $result_id;
}

测试 $sql 中是否包含“SELECT”的部分不起作用，所以当我尝试插入时，“$result_id->execute()”被调用了两次。

【讨论】：