ecshop ＭySQL主从复制中的一个小问题

在搭建mysql主从复制结构后，发现mysql从库的日志中频繁出现以下警告：

 

[Warning] Statement may not be safe to log in statement format. Statement: UPDATE `ecshop`.`peixun_sessions` SET expiry = '1300718449', ip = '119.36.87.150', userid = '0', adminid = '0', user_name='0', user_rank='0', discount='1', email='0', data = 'a:3:{s:7:\"from_ad\";i:0;s:7:\"referer\";s:4:\"本站\";s:10:\"login_fail\";i:0;}' WHERE sesskey = '815b45228773afe524f7651ad9b8e84f' LIMIT 1

 

经过检查，这是因为加有limit导致，MySQL认为添加limit会导致主从库数据可能不一致，就出现警告，解决方式有多种，但是对一个处于生产环境中的MySQL主从结构，建议还是从程序入手，尽可能不要修改MySQL配置（既然已经MySQL稳定运行，擅自修改其配置，就可能存在风险）

 

修改ecshop的源文件　includes/cls_session.php

 

大约228行左右找到

return $this->db->query('UPDATE ' . $this->session_table . " SET expiry = '" . $this->_time . "', ip = '" . $this->_ip . "', userid = '" . $userid . "', adminid = '" . $adminid . "', user_name='" . $user_name . "', user_rank='" . $user_rank . "', discount='" . $discount . "', email='" . $email . "', data = '$data' WHERE sesskey = '" . $this->session_id . "' LIMIT 1");

 

将最后的LIMIT 1去掉，即：
return $this->db->query('UPDATE ' . $this->session_table . " SET expiry = '" . $this->_time . "', ip = '" . $this->_ip . "', userid = '" . $userid . "', adminid = '" . $adminid . "', user_name='" . $user_name . "', user_rank='" . $user_rank . "', discount='" . $discount . "', email='" . $email . "', data = '$data' WHERE sesskey = '" . $this->session_id . "'");

 

再找到destroy_session方法的定义中：

$this->db->query('DELETE FROM ' . $this->session_data_table . " WHERE sesskey = '" . $this->session_id . "' LIMIT 1");

        return $this->db->query('DELETE FROM ' . $this->session_table . " WHERE sesskey = '" . $this->session_id . "' LIMIT 1");

 

同样，将 limit 1去掉