我想用Hibernate映射一个虚拟表你可以帮我定一下< Acc_Nbr flag1 flag2 flag3 flag4 Exposure
< ab 1 0 1 0 1000
< bc 0 1 1 0 2000
< cd 1 1 0 1 3000
< ef 1 0 1 1 4000
< Expected Output
< Variable Count_Acct_Number Sum_Exposure Total_Acct_Number Total_Expo
< flag1 3 8000 4 10000
< flag2 2 5000 4 10000
< flag3 3 7000 4 10000
< flag4 2 7000 4 10000
dummy.hbm.xml
我应该在java类中定义哪种类型的变量？
desc dummy;
type=timestamp, Default=CURRENT_TIMESTAMP, extra=on update CURRENT_TIMESTAMP