Subject RE: [Firebird-Java] PreparedStatement with LIKE ? extremly slow
Author Rick Debay
Or the program could use the appropriate SQL depending on if it was
going to use a wild-card or not.

-----Original Message-----
[] On Behalf Of Roman Rokytskyy
Sent: Tuesday, February 06, 2007 4:45 AM
Subject: Re: [Firebird-Java] PreparedStatement with LIKE ? extremly slow

> What values should be used for 1= ? and 2 = ? ???
> '2005-0119849- 8' ???

No, it should be something like:

WHERE (1 = 2 AND f_liefer_nr = '2005-0119849- 8') OR ( 2 = 2 AND
f_liefer_nr LIKE '2005-0119849- 8')


WHERE (1 = 1 AND f_liefer_nr = '2005-0119849- 8') OR ( 2 = 1 AND
f_liefer_nr LIKE '2005-0119849- 8')

But I guess it won't work. You should check:

SELECT * FROM my_table WHERE (1 = ? AND f_liefer_nr = ?) UNION SELECT *
FROM my_table WHERE (2 = ? AND f_liefer_nr LIKE ?)

The first statement would not use the index in OR condition, while the
union will. The first parameters should be equal, 1 or 2, this is a
switch that switches off one or another part of the statement.


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