Hi.
I have a performance problem with prepared statements (JDBC prepared
statement).
This query:
PreparedStatement st = conn.prepareStatement("SELECT id FROM
dga_dienstleister WHERE plz like '45257'");
does use an index.
This query:
String plz = "45257";
PreparedStatement st = conn.prepareStatement("SELECT id FROM
dga_dienstleister WHERE plz like ?");
st.setString(1, plz);
does NOT use an index.
As it should in the end result in absolutely the same statement, the
index should be used all the time. I have to set the
protocolVersion=2 and use the JDBC2 driver to get it working (but
then the statements are created like in the first query, so no
solution, only a workaround).
I'm not sure whether this is a bug (I think it is) or a problem of
understanding.
Known problem?
I have tried PG 8.0.1, 8.0.3, 8.1beta with the JDBC-drivers
- postgresql-8.0-312.jdbc2.jar --> okay with protocolVersion=2 in the
URL
- postgresql-8.0-312.jdbc3.jar --> not okay whatever I do
I'm on Mac OS X, if that matters.
cug
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