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mysql 中 int型对小数位的处理

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Release: 2016-06-07 15:07:19
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在mysql中,int型表示整型,如果遇到非整型,如何处理呢?下面创建存储过程测试一下 CREATE DEFINER=`root`@`localhost` PROCEDURE `test`() BEGIN declare x int default 0; declare y int default 0; declare y1 int default 0; declare y2 int default 0;

 在mysql中,int型表示整型,如果遇到非整型,如何处理呢?下面创建存储过程测试一下

CREATE DEFINER=`root`@`localhost` PROCEDURE `test`()
BEGIN
  declare x int default 0;
  declare y int default 0;
  declare y1 int default 0;
  declare y2 int default 0;
     set x=54;
     set y=51*0.2;
     set y1=54*0.2;
     set y2=1.2;
     select y;
     select y1;
     select y2;

END

执行

mysql> call test;
+------+
| y    |
+------+
|   10 |
+------+
1 row in set (0.00 sec)

+------+
| y1   |
+------+
|   11 |
+------+
1 row in set (0.00 sec)

+------+
| y2   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

可以看出,mysql int型对于非整型进行四舍五入处理,对数值严格要求的不能这样随意赋值或转换,必须使用精确的类型表示。


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