MySQL中日期比较时遇到的编码问题解决办法_MySQL

今天帮同事处理一个SQL（简化过后的）执行报错：

<br />mysql> select date_format('2013-11-19','Y-m-d') > timediff('2013-11-19', '2013-11-20');                                        

ERROR 1267 (HY000): Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,NUMERIC) for operation ‘>’

乍一看挺莫名其妙的，查了下手册，发现有这么一段：

<br />The language used for day and month names and abbreviations is controlled by the value of the lc_time_names system variable (Section 9.7, “MySQL Server Locale Support”).

The DATE_FORMAT() returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters.

也就是说，DATE_FORMATE() 函数返回的结果是带有字符集/校验集属性的，而 TIMEDIFF() 函数则没有字符集/校验集属性，我们来验证一下：

<br />mysql> set names utf8;<br />mysql> select charset(date_format('2013-11-19','Y-m-d')), charset(timediff('2013-11-19', '2013-11-20'));<br />+--------------------------------------------+-----------------------------------------------+<br />| charset(date_format('2013-11-19','Y-m-d')) | charset(timediff('2013-11-19', '2013-11-20')) |<br />+--------------------------------------------+-----------------------------------------------+<br />| utf8                                       | binary                                        |<br />+--------------------------------------------+-----------------------------------------------+

mysql> set names gb2312;
mysql> select charset(date_format(‘2013-11-19′,’Y-m-d’)), charset(timediff(‘2013-11-19’, ‘2013-11-20’));
+——————————————–+———————————————–+

| charset(date_format(‘2013-11-19′,’Y-m-d’)) | charset(timediff(‘2013-11-19’, ‘2013-11-20’)) |
+——————————————–+———————————————–+
| gb2312 | binary |
+——————————————–+———————————————–+

可以看到，随着通过 SET NAMES 修改 character_set_connection、collation_connection 值，DATE_FORMAT() 函数返回结果的字符集也跟着不一样。在这种情况下，想要正常工作，就需要将结果进行一次字符集转换，例如：

<br />mysql> select date_format('2013-11-19','Y-m-d') > convert(timediff('2013-11-19', '2013-11-20') using utf8);<br />+----------------------------------------------------------------------------------------------+<br />| date_format('2013-11-19','Y-m-d') > convert(timediff('2013-11-19', '2013-11-20') using utf8) |<br />+----------------------------------------------------------------------------------------------+<br />|                                                                                            1 |<br />+----------------------------------------------------------------------------------------------+

就可以了

P.S，MySQL的版本：5.5.20-55-log Percona Server (GPL), Release rel24.1, Revision 217

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