On Sun, May 10, 2009 at 10:03:57PM -0400, Roy Donaldson scratched on the wall:
> SELECT rowid, colA FROM Table1;
> SELECT rowid, colB FROM Table1 WHERE rowid IN (?,?,?,...) AND colA = ?;
> SELECT rowid, colC,colD FROM Table1 WHERE rowid IN (?,?,?,...) AND colB = ?;
> SELECT rowid, colE FROM Table1 WHERE rowid IN (?,?,?,...) AND colC = ? AND
> colD = ?;
> ...
>
> Is this possible to do with parameterized statements? Since the number of
> items in the "IN" group changes for each SELECT statement (the subgroup gets
> narrower and narrower), I would guess that it's not possible and as well as
> defeating some of the usefulness of parameterized statements.
Unfortunately, no, it isn't, for exactly the reasons you're thinking.
> The only option that I've thought of is to use string concatenation so that
> I would end up with something like this:
>
> string subgroup = "('1', '2', '3')";
> string sqlQuery = "SELECT rowid, colB FROM Table1 WHERE rowid IN " +
> subgroup + " AND colA = ?;
>
> Any other suggestions?
Depending on your environment, temp tables can work very well for
this kind of thing. Have the IN( ) do a subselect and use the table
as your array. Of course, you can't parametrize the table name, so
you might still end up building statements more often than you wish.
-j
--
Jay A. Kreibich < J A Y @ K R E I B I.C H >
"Our opponent is an alien starship packed with atomic bombs. We have
a protractor." "I'll go home and see if I can scrounge up a ruler
and a piece of string." --from Anathem by Neal Stephenson
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