hibernate - How can I represent my SQL INTEGER as floating point value using Hibernate's formula

Question

To achieve better performance I want to store percent value with two digits after floating point as integer. E.g. 99.99% as 9999. How can I convert back 9999 to 99.99%? I cannot recompile my java code to do this in Java according to some security reasons. So, how can I do this using HQL formula in my externalized mappings files? Thanks!

Answer 1

对于 MySQL 5.5 工作：

连接（值 / 100.0，'%'）

和

cast(a.percentValue AS double)/100

因 MySQLSyntaxErrorException 而失败