Re: problem to get nextval of a sequence

Daniel,

You have to call ress.next() before you get the value.

Dave

Daniel Schaedler wrote:

> Hi List
>
> I try to get the 'nextval' of a sequence:
> ***
> String query = "SELECT nextval('nodes_nodeid_seq')";
> pstmt = conn.prepareStatement(query);
> logger.debug("statement: " + pstmt.toString());
> ResultSet ress = pstmt.executeQuery();
> long newID = ress.getLong("nextval"); // <-- Exception
> ***
>
> I get the following Exception:
> ***
> org.postgresql.util.PSQLException: ResultSet not positioned properly,
> perhaps you need to call next.
> at
> org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkResultSet(AbstractJdbc2ResultSet.java:2380)
>
> at
> org.postgresql.jdbc2.AbstractJdbc2ResultSet.getString(AbstractJdbc2ResultSet.java:1821)
>
> at
> org.postgresql.jdbc2.AbstractJdbc2ResultSet.getFixedString(AbstractJdbc2ResultSet.java:2326)
>
> at
> org.postgresql.jdbc2.AbstractJdbc2ResultSet.getLong(AbstractJdbc2ResultSet.java:1935)
>
> at
> org.postgresql.jdbc2.AbstractJdbc2ResultSet.getLong(AbstractJdbc2ResultSet.java:2158)
>
> at org.daniel.pws.store.PostgresStore.newNode(PostgresStore.java:307)
> at org.daniel.pws.store.StoreTester.main(StoreTester.java:71)
> 2004-12-28 13:41:57,983 - not able to get the new nodeID
> ****
>
> executing the query in PostgresSQL directly works, I get the correct
> return value.
> The Query itself seems to be executet, as I get other exceptions if I
> misspell the columnname (e.g.).
> I'm working with Postgres-jdbc: pg80b1-1.308.jdbc3.jar and JDK 1.5.0
>
> someone an Idea?
>
> wishing all a Happy new Year
> Daniel

--
Dave Cramer
http://www.postgresintl.com
519 939 0336
ICQ#14675561