MySQL错误 - 命令不同步;您现在无法运行此命令 [英] MySQL Error - Commands out of sync; you can't run this command now

问题描述

我使用MySQL与PHP，Codeigniter。我有一个问题，由后面的此处的bluefeet回答

I am using MySQL with PHP, Codeigniter. I had a question which was answered by bluefeet in the post here

我通过bluefeet创建了第二个解决方案的存储过程。但是，在生产环境中调用该过程时，所有其他用户都会收到错误

I created a stored procedure for the second solution by bluefeet. It works perfect, however, while the procedure is called in the production environment, all the other users get the error

命令不同步;您现在无法运行此命令

Commands out of sync; you can't run this command now

不知道我该如何克服这个错误。我也尝试在调用过程后关闭连接，但是，来自其他用户的查询在连接关闭之前执行。此问题的任何解决方法？

Not sure how can i overcome with this error. I also tried closing the connection after the procedure is called, however, Queries from other users are executed before the connection is closed. Any work-around for this issue?

以下是我使用的存储过程

Below is the stored procedure that i have used

DROP PROCEDURE IF EXISTS mailbox.circle_pending_p;
CREATE PROCEDURE mailbox.`circle_pending_p`()
BEGIN
SET @sql = NULL;
SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'sum(CASE WHEN maildate = ''',
      date_format(mailtime, '%e-%b'),
      ''' THEN 1 else 0 END) AS `',
      date_format(mailtime, '%e-%b'), '`'
    )
  ) INTO @sql
FROM circle_pending_temp
WHERE mailtime >= (select date_sub(max(mailtime), interval 8 DAY)
                   from circle_pending_temp);

SET @sql 
  = CONCAT('SELECT coalesce(email_Circle, ''Grand Total'') Circle,
              max(`< 9 days`) `< 9 days`, ', @sql, ' ,
              count(*) GrandTotal
            from
            (
              select c.email_Circle,
                date_format(c.mailtime, ''%e-%b'') maildate,
                coalesce(o.`< 9 days`, 0) `< 9 days`
              from circle_pending_temp c
              left join
              (
                select email_Circle,
                  count(*) `< 9 days`
                from circle_pending_temp
                where mailtime <= (select date_sub(max(mailtime), interval 8 DAY)
                                    from circle_pending_temp)
              ) o
                on c.email_Circle = o.email_Circle
              where c.mailtime >= (select date_sub(max(mailtime), interval 8 DAY)
                                      from circle_pending_temp)
            ) d
            group by email_Circle with rollup ');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END;

我用于调用此过程的PHP是

The PHP that i use for calling this procedure is

    $db = $this->load->database('mailbox',TRUE);
    $res = $db->query('Call circle_pending_p()');
    echo $db->_error_message();
    $db->close();
    $db = $this->load->database('mailbox',TRUE);
    if ($res->num_rows() > 0) {
        return $res->result_array();
    } else {
        return 0;
    }

推荐答案

似乎codeigniter的mysql驱动程序有错误处理存储过程。

Got the Answer! It seems like codeigniter's mysql driver has bugs handling stored procedures.

我在 config / database 文件中更改了驱动程序从mysql到mysqli

I changed the drivers from mysql to mysqli in the config/database file by changing

$db['default']['dbdriver'] = 'mysql';

到

$db['default']['dbdriver'] = 'mysqli';

我修改了 system / database / drivers / mysqli / mysqli_result.php 文件并添加了以下函数

Post that i modified the system/database/drivers/mysqli/mysqli_result.php file and added the below function

function next_result()
{
  if (is_object($this->conn_id))
  {
      return mysqli_next_result($this->conn_id);
  }
}

并修改以下模型

$db = $this->load->database('mailbox',TRUE);
$qry_res = $db->query('Call circle_pending_p()');

echo $db->_error_message();
$res = $qry_res->result_array();

$qry_res->next_result();
$qry_res->free_result();

if (count($res) > 0) {
      return $res;
} else {
      return 0;
}

这解决了问题！

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