Prepared statements related problem

Question

Hi,
i have this strange problem with prepared statements i think.
When i execute an insert query without prepared statements i works fine (always), when i use prepared statements it sometimes gives a db error saying i'm trying to insert a null value.
The problem is that I'm not!!!
If i were why does it work sometimes?
It may be a bug but i don't know where to look for it... is it a prepared statements, application server or db2 problem?

Answer 1

This is the code...
     public void insertArticolo(Articolo item) throws Exception {
          PreparedStatement ps = null;
               try {          
                    StringBuffer sql = new StringBuffer("insert into RUW.RUWT1_ARTICOLO (");
                    sql.append("C_ENTE, C_CONCESSIONE,N_ANNO_RUOLO,N_PROGR_RUOLO,N_PARTITA,N_PROGR_PARTITA,N_PROGR_TRIBUTO, ");
                    sql.append("C_TRIBUTO, C_TIPO_UFF,C_UFFICIO,");
                    sql.append("C_TIPO_IMP, N_ANNO_IMP, L_CARICO, S_ARTICOLO");
                    sql.append(") values (");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?" + ", ");
                    sql.append("?");
                    sql.append(")");
                    ps = connectionCreatePreparedStatement(sql.toString());
                    System.out.println(sql.toString());
                    KeyArticolo keyArticolo = item.getKeyArticolo();
                    KeyPartita keyPartita = keyArticolo.getKeyPartita();
                    Ente ente = keyPartita.getKeyRuolo().getEnte();
                    System.out.println("/"+ ente.getCodEnte()+ "/");
                    System.out.println("/"+ keyPartita.getKeyRuolo().getConcessione().getCodConc()+ "/");
                    System.out.println("/"+ keyPartita.getKeyRuolo().getAnnoRuolo()+ "/");
                    System.out.println("/"+ keyPartita.getKeyRuolo().getProgRuolo()+ "/");
                    System.out.println("/"+ keyPartita.getNumPartita()+ "/");
                    System.out.println("/"+ keyPartita.getProgPartita()+ "/");
                    System.out.println("/"+ item.getKeyArticolo().getProgArticolo()+ "/");
                    System.out.println("/"+ item.getCodEntrata()+ "/");
                    System.out.println("/"+ ente.getTipoUfficio()+ "/");
                    System.out.println("/"+ ente.getCodUfficio()+ "/");
                    System.out.println("/"+ item.getTipoImposta()+ "/");
                    System.out.println("/"+ item.getAnnoImposta()+ "/");
                    System.out.println("/"+ item.getCaricoOrigine()+ "/");
                    if (item.getDescArticolo().equals("")) {
                         item.setDescArticolo(" ");
                    System.out.println("/"+ item.getDescArticolo()+ "/");
                    ps.setLong(1,ente.getCodEnte());
                    ps.setLong(2,keyPartita.getKeyRuolo().getConcessione().getCodConc());
                    ps.setLong(3,keyPartita.getKeyRuolo().getAnnoRuolo());
                    ps.setLong(4,keyPartita.getKeyRuolo().getProgRuolo());
                    ps.setLong(5,keyPartita.getNumPartita());
                    ps.setLong(6,keyPartita.getProgPartita());
                    ps.setLong(7,item.getKeyArticolo().getProgArticolo());
                    ps.setString(8,item.getCodEntrata());
                    ps.setString(9,ente.getTipoUfficio());
                    ps.setString(10,ente.getCodUfficio());
                    ps.setString(11,item.getTipoImposta());
                    ps.setLong(12,item.getAnnoImposta());
                    ps.setLong(13,item.getCaricoOrigine());
                    ps.setString(14,item.getDescArticolo());
                    ps.executeUpdate();
               catch (Exception e) {
                    e.printStackTrace();
                    connectionCloseStatement(ps);
                    throw e;
          }and this is the result of the systemout
[10/03/06 14.07.07:051 CET] 76357635 SystemOut O insert into RUW.RUWT1_ARTICOLO (C_ENTE, C_CONCESSIONE,N_ANNO_RUOLO,N_PROGR_RUOLO,N_PARTITA,N_PROGR_PARTITA,N_PROGR_TRIBUTO, C_TRIBUTO, C_TIPO_UFF,C_UFFICIO,C_TIPO_IMP, N_ANNO_IMP, L_CARICO, S_ARTICOLO) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
/13199/
/66/
/2002/
/1564/
/28330/
/1/
/2/
/0997/
/120/
/2002/
/11900/
/ /