获取MySQL中变量的类型？
无法获取 MySQL 中变量的类型。使用 CAST 运算符将变量的类型转换为另一个类型。语法如下 -
SET @yourVariableName:=’anyValue’登录后复制
SELECT CAST( @yourVariableName AS SIGNED);登录后复制
情况 1：字符串转换为无符号 -
mysql> set @StringToInt:='12345'; Query OK, 0 rows affected (0.00 sec)登录后复制
mysql> select CAST(@StringToInt as UNSIGNED);登录后复制
+--------------------------------+ | CAST(@StringToInt as UNSIGNED) | +--------------------------------+ | 12345 | +--------------------------------+ 1 row in set (0.00 sec)登录后复制
查询如下 -
mysql> set @IntTochar:=CAST(65 as CHAR); Query OK, 0 rows affected (0.00 sec)登录后复制
mysql> select @IntTochar;登录后复制
+------------+ | @IntTochar | +------------+ | 65 | +------------+ 1 row in set (0.00 sec)登录后复制
