Execute a query in Jdeveloper using DB adpater

Question

Hi All ,
In jdeveloper, using DB adapter i want to execute the following query ,
select segment1,eng_item_flag from table_name where segment1 in ('itemnumber1',’itemnumber2’);
In the query the operation IN got used so could you please help me to proceed further

Answer 1

DB adpater wraps the parameter by ' (apostrophe), so using IN clause it becomes '1,2,3,4,5.........n' and the query returns nothing.
You need to use below query in DB Adpater
select attributes,attributes2 from table name where partnumber in (WITH VALUE_LIST AS
(SELECT ? val FROM dual)
SELECT SUBSTR(val, (decode(LEVEL, 1, 0, instr(val, ',', 1, LEVEL -1)) + 1), (decode(instr(val, ',', 1, LEVEL) -1, -1, LENGTH(val), instr(val, ',', 1, LEVEL) -1)) -(decode(LEVEL, 1, 0, instr(val, ',', 1, LEVEL -1)) + 1) + 1) a
FROM VALUE_LIST CONNECT BY LEVEL <=
(SELECT(LENGTH(val) -LENGTH(REPLACE(val, ',', NULL)))
FROM VALUE_LIST) + 1)
Value of <partnumber> tag can be mapped to DB Adapter Inputvariable.
If you create a very big value list for IN query (greater than 4000 characters) you will get ORA-01704: string literal too long error. In that case you need to break value list and invoke this query multiple times.
Thanks
Ravdeep