MySQL BIGINT UNSIGNED value is out of range... 的问题和解决

从MySQL 5.5.5开始，这种情况会返回一个错误：BIGINT UNSIGNED value is out of range... 

比如： 如果结果为负数： [SQL] SELECT (CAST(0 AS UNSIGNED)-1); [Err] 1690 - BIGINT UNSIGNED value is out of range in ‘(cast(0 as unsigned) - 1)‘
[SQL] SELECT (1-CAST(2 AS UNSIGNED)); [Err] 1690 - BIGINT UNSIGNED value is out of range in ‘(1 - cast(2 as unsigned))‘
如果结果为正数： [SQL] SELECT (1-CAST(0 AS UNSIGNED)); 1
解决方法： 1、如果确实可以接受负数的结果，那么把其中的UNSIGNED字段强转为SIGNED类型： [SQL] SELECT (1-CAST(2 AS SIGNED)); -1
如果计算结果是要插入到另外一个UNSIGNED INT字段中的话，那么就不要强转了，直接捕捉并报告异常。
 参考：http://dev.mysql.com/doc/refman/5.6/en/out-of-range-and-overflow.html
（原创文章，转载请注明转自Clement-Xu的博客）

版权声明：本文为原创文章，转载请注明转自Clement-Xu的csdn博客。

MySQL BIGINT UNSIGNED value is out of range... 的问题和解决

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