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Re: using postgresql-8.0-311.jdbc2.jar

From: Roland Walter <rwa(at)mosaic-ag(dot)com>
To: sarves <sharvesh(at)midascomm(dot)com>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: using postgresql-8.0-311.jdbc2.jar
Date: 2005-06-29 14:35:42
Message-ID: 42C2B1BE.9080802@mosaic-ag.com (view raw or flat)
Thread:
Lists: pgsql-jdbc
sarves schrieb:

> Dear sir,
> 
>          I was interfacing with postgreSQL 7.1.3 from my application 
> using the JDBC driver released with it. Now,I'm trying to communicate 
> with postgreSQL 8.0.3 with postgresql-8.0-311.jdbc2.jar. PostgreSQL 
> 8.0.3 server is running on another machine in LAN. My application 
> connects to the server using postgresql-8.0-311.jdbc2.jar. While it is 
> possible to connect to the server,the response for each query is empty 
> data though there's data in server for the given query. The following 
> method is used to execute each query:
> 
> public Vector TableQuery(String instruction)  {
> 
>    SQL = instruction;
>    Vector queryResult= new Vector(); //Vector de vectores
>    Vector TableRow = new Vector();
>    TableHeader = new Vector();
>    ResultSet rs;
> 
>    try {
>          rs = st.executeQuery(instruction);
>          ResultSetMetaData rsmd = rs.getMetaData();
>          // Extraer Nombres de Columnas
>          int cols = rsmd.getColumnCount();
>          for(int i=1;i<=cols;i++)
>            TableHeader.addElement(rsmd.getColumnLabel(i));
>          // Extraer registros
>          int num = rs.getFetchSize();

As far as I know, getFetchSize() will return 0 in all cases.
It is not possible to use this for getting the count of
selected rows. Remove the if (num>0) below.

> 
>          if (num>0) {
> 
>              while (rs.next()) {
> 
>                     TableRow = new Vector();
> 
>                     for  (int i=1;i<=cols;i++) {
> 
>                          Object o = rs.getObject(i);
> 
>                          if (rs.wasNull())TableRow.addElement(o);
>                      }
> 
>                     queryResult.addElement(TableRow);
>                }
>               wasFail = false;
>            }
>      }
>    catch(Exception ex) {
>          wasFail = true;
>          problem = ex.getMessage();
>          System.out.println("Error: " + ex);
>          ex.printStackTrace();
>       }
> 
>    return queryResult;
>  }
> 
> No exception is thrown. It should be noted that the same snippet works 
> if I use the JDBC driver given with postgreSQL 7.1.3 to communicate with 
> postgreSQL 8.0.3.
> 
> What could the problem be?
> Thanks in advance.
> 
> sincerely,
> Sarveswaran M
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings
> 


-- 
Roland Walter
MOSAIC SOFTWARE AG
Telefon: 02225/882-411 Fax: 02225/882-201
http://www.mosaic-ag.com
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