Обсуждение: getting nextval from query?

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getting nextval from query?

От
"G.L. Grobe"
Дата:
To create a primary key for one of my session beans within the ejbCreate(), I'm doing a the following.
 
          ...
         query = "SELECT NEXTVAL('versions_seq')";
 
         pstmt = dbConn.prepareStatement(query);
 
         rs = pstmt.executeQuery();
 
         rs.next();
         num = (int) rs.getInt("last_value");
 
But as show by the exception below, this does not work. How do I get the nextval value out from this query? So it's an attribute ... but I'd still like to know how to get to it.
 
[Default] Exception = The column name last_value not found.
[BuildKit] TRANSACTION ROLLBACK EXCEPTION:null; nested exception is:
        javax.ejb.EJBException
Any help much appreciated.

RE: getting nextval from query?

От
"Dave Cramer"
Дата:
Gary,
 
That is because the column name is actually nextval. you need to change your code to
 
num = (int)rs.getInt("nextval);
 
Dave
-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of G.L. Grobe
Sent: July 29, 2001 1:56 AM
To: pgsql-general@postgresql.org
Subject: [GENERAL] getting nextval from query?

To create a primary key for one of my session beans within the ejbCreate(), I'm doing a the following.
 
          ...
         query = "SELECT NEXTVAL('versions_seq')";
 
         pstmt = dbConn.prepareStatement(query);
 
         rs = pstmt.executeQuery();
 
         rs.next();
         num = (int) rs.getInt("last_value");
 
But as show by the exception below, this does not work. How do I get the nextval value out from this query? So it's an attribute ... but I'd still like to know how to get to it.
 
[Default] Exception = The column name last_value not found.
[BuildKit] TRANSACTION ROLLBACK EXCEPTION:null; nested exception is:
        javax.ejb.EJBException
Any help much appreciated.