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Re: problem to get nextval of a sequence

From: Dave Cramer <pg(at)fastcrypt(dot)com>
To: Daniel Schaedler <postgres-jdbc(at)daniel(dot)schaedler(dot)name>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: problem to get nextval of a sequence
Date: 2004-12-28 13:08:27
Message-ID: 41D15ACB.8050109@fastcrypt.com (view raw or flat)
Thread:
Lists: pgsql-jdbc
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


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