Problem with 8.1 driver

Hi,

I am running postgresql-8.1-404.jdbc3.jar against server version 7.4.7,
which I want to eventually upgrade to 8.1.

Right now I am testing our application with the 8.1 driver and found an
issue with a prepared query. (Btw. I am using a regular connection URL
without any special parameters set.)

The offending code looks like this:

String DELETE_QUERY = "DELETE FROM server_log WHERE level_value"
    + " <= ? AND event_time < NOW() - interval ?";

PreparedStatement stmt = con.prepareStatement(DELETE_QUERY);
stmt.setInt(1, level.intValue());
stmt.setString(2, "1 day");

int deleted = stmt.executeUpdate();

Using the 7.4 driver this worked just fine. Now with the new driver I get:
org.postgresql.util.PSQLException: ERROR: syntax error at or near "$2"
at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1512)
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1297)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:188)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:430)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:346)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:300)
...

Server statement log shows:
DELETE FROM server_log WHERE level_value <= $1 AND event_time < NOW() -
interval $2

Is this a bug, or is the driver just not compatible with the server? Should
not be so because both speak the V3 protocol. Thanks for your help.

Best Regards,
Michael Paesold