MySQL中日期比较时遇到的编码问题解决办法vnsc5

时间:2020-04-01 16:46来源:计算机教程
The DATE_FORMAT() returns a string with a character set and collationgiven by character_set_connection and collation_connection so that itcan return month and weekday names containing non-ASCIIcharacters.也就是说,DATE_FORMATE()函数返

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:复制代码 代码如下:mysql set names utf8;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')) | -------------------------------------------- ----------------------------------------------- | utf8 | binary | -------------------------------------------- -----------------------------------------------

今天帮同事处理一个SQL执行报错:复制代码 代码如下:mysql select date_format('2013-11-19','Y-m-d') timediff('2013-11-19', '2013-11-20');

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

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:复制代码 代码如下: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”).

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_vnsc5858威尼斯城官网,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:复制代码 代码如下:mysql select date_format('2013-11-19','Y-m-d') convert(timediff('2013-11-19', '2013-11-20') using utf8); ---------------------------------------------------------------------------------------------- | date_format('2013-11-19','Y-m-d') convert(timediff('2013-11-19', '2013-11-20') using utf8) | ---------------------------------------------------------------------------------------------- | 1 | ---------------------------------------------------------------------------------------------- 就可以了

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