How to change VO query dynamically

Question

Hi,
Iam trying to change the VO query dynamically. My req. is I have 6 columns in a header page 3 columns(default single column) for sorting purpose and another 3 columns(default single column) for data querying purpose.
al these are in one view so I have created one VO.
Sorting Searching
A A
B B
C C
When I give any values in Sorting and hit submit button VO query should change dynamically.
I have searched older post regarding this.
My query is some thing like this
SELECT * from cust_table where a = NVL(:1 ,a)
UNION
SELECT * from cust_table where a<> NVL(:1 ,a)
order by a
Iam trying to pas the below part dynamicaly in my AM method
vo.setWherecaluse("where a = NVL(:1 ,a)
UNION
SELECT * from cust_table where a<> NVL(:1 ,a)
order by a ")
and trying to pass the params to that query. But it is not working.Giving error "Bind variable could not find"
Can any one suggest how to solve the issue.
Thanks,
Mahesh

Answer 1

Hello Ajay,
THanks for your response.
My vo query is select col1,col2,col3,col4,col5,col6 from cust_table;
and and changing vo.setwhereclause dynamically based on different scenerios.
in one scenerio i need my query to be some thing like
SELECT col1,col2,col3,col4,col5,col6 from cust_table where a = NVL(:1 ,a)
UNION
SELECT col1,col2,col3,col4,col5,col6 from cust_table where a <> NVL(:1 ,a)
order by a
so can i concatenate my vo.setwhereclause like *"where a = NVL(:1 ,a) UNION SELECT col1,col2,col3,col4,col5,col6 from cust_table where a NVL(:2 ,a) order by a"*
in the setwhereclause iam setting bind variables is this method correct? Hope it is clear pleaselet me know if it is not clear I will explain in detail.
Thanks,