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mysql内置函数,在mysql里面利用str_to_date()把字符串转换为日期。
示例:分隔符一致,年月日要一致
select str_to_date(‘2008-4-2 15:3:28‘,‘%Y-%m-%d %H:%i:%s‘);
select str_to_date(‘2008-08-09 08:9:30‘, ‘%Y-%m-%d %h:%i:%s‘);
对于这个已经理解,但是为何查询字段时使用这种方法查询出来的数据为null????
刚发现的问题,尝试在client上查询,发现可以出现数据,但是在SQLyog上却是null
mysql> SELECT STR_TO_DATE(startDate,‘%Y年%m月%d日‘) FROM caselibrarycommon;
+---------------------------------------+
| STR_TO_DATE(startDate,‘%Y年%m月%d日‘) |
+---------------------------------------+
| 2015-06-16 |
| 2015-06-05 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-07 |
| 2015-06-09 |
| 2015-06-08 |
| 2015-06-10 |
| 2015-06-11 |
| 2015-06-11 |
| 2015-06-11 |
| 2015-06-12 |
这是什么原因?
mysql> SELECT STR_TO_DATE(startDate,‘%Y年%m月%d日‘) FROM caselibrarycommon
-> WHERE STR_TO_DATE(startDate,‘%Y年%m月%d日‘) BETWEEN STR_TO_DATE(‘2015年6
‘> 月5日‘,‘%Y年%m月%d日‘) AND STR_TO_DATE(‘2015年6月20日‘,‘%Y年%m月%d日‘);
+---------------------------------------+
| STR_TO_DATE(startDate,‘%Y年%m月%d日‘) |
+---------------------------------------+
| 2015-06-16 |
| 2015-06-05 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-06 |
| 2015-06-07 |
| 2015-06-09 |
| 2015-06-08 |
| 2015-06-10 |
| 2015-06-11 |
| 2015-06-11 |
| 2015-06-11 |
| 2015-06-12 |
| 2015-06-16 |
| 2015-06-16 |
| 2015-06-17 |
| 2015-06-17 |
| 2015-06-17 |
| 2015-06-18 |
+---------------------------------------+
20 rows in set (0.00 sec)
select str_to_date(detectResult.`rcvDetectTime`,‘%Y-%m-%d %H:%i:%s‘) from detectResult where str_to_date(detectResult.`rcvDetectTime`,‘%Y-%m-%d %H:%i:%s‘)>=‘2010-11-22 14:49:52‘ and str_to_date(detectResult.`rcvDetectTime`,‘%Y-%m-%d %H:%i:%s‘)<=‘2010-11-22 15:27:52‘
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原文地址:http://www.cnblogs.com/LuoXiaoTing604404828/p/4625729.html