Ensuring Oracle caches an in() clause

Question

How do I post a select statement against Oracle that includes an IN(...) clause with varying lengths and make sure it gets cached in the SQL-Area.
Joinig to a temporary tables seems too expensive to me since I must handle lots of HTTP-Sessions concurrently.
Any ideas?
Thankx,
Jan

Answer 1

One way I've found to get around this is to have .net pass in a comma seperated list of values into the procedure, then have the procedure split it up into a table and use that in the IN. There's probably a better way to do it, but this works:
create or replace
TYPE "STRINGTABLETYPE" AS TABLE OF VARCHAR2(30);
create or replace
FUNCTION "FUNC_STR2STRTBL"
( p_str in varchar2 ) return
stringTableType
as
l_str long default p_str || ',';
l_n number;
l_data stringTableType := stringTabletype();
begin
loop
l_n := instr( l_str, ',' );
exit when (nvl(l_n,0) = 0);
l_data.extend;
l_data( l_data.count ) := ltrim(rtrim(substr(l_str,1,l_n-1)));
l_str := substr( l_str, l_n+1 );
end loop;
return l_data;
end;
Then in your actual query procedure, you can do something like this:
SELECT * FROM table WHERE column IN (select * from THE (select cast(FUNC_STR2TBL(parameter) as STRINGTABLETYPE) from dual))