ibatis动态SQL使用如何通过IBATIS动态Sql实现两个日期之间

Question

我想在Ibatis中做一个复杂的动态选择语句，就像这样

select * from emp 
//when dateParam between 2012-03-1 and 2013-03-01 then
union
select * from emp1
//when dateParam between 2014-03-1 and 2015-03-01 then
union
select * from emp2

Answer 1

我这样做：

select * from emp  
<isLessEqual  property="dateParam" compareValue="2015-03-01">
  union
  select * from emp1
</isLessEqual>
<isLessEqual  property="dateParam" compareValue="2013-03-01">
  union
  select * from emp1
</isLessEqual>