asked on

how to handle auto generate number java with MS Sql Server in prepared statement

I attempt to insert values into MS Sql server table with auto generate number.
I use prepared statement.
how can I handle it. ?
My comments are in the code below
I appreciate anyone's suggestion.
Chris

String insertQry = " insert into " + eventView +
         "(EV_ID_NUMBER "         +  //auto number
         "SI_ID"                             +
         ", EV_COUNT_DATE"     +
         ", EV_DIR"                        +
         " ,EV_CONS"                   +
         " ,EV_INS_DATE"            +
         " ,EV_INS_WEATHER"    +
         " ,EV_REM_DATE"           +
         " ,EV_REM_WEATER"  +
         " ,EV_STATION_TYPE"  +
         " ,EV_RECEIVE_DATE)"  +
         "VALUES (?,?,?,?,?,?,?,?,?,?,?)";
// staID_FK - it is a number - used as a foreign key
//staInfoFromFile it is an object that contain incoming information, I need to insert to database
   MSSqlServer.updateQuery(insertQry, staID_FK, staInfoFromFile);
//-----------different class----------------------
public static void updateQuery (String query,Integer staID_FK, StationInfoStructure staInfoFromFile ) {
       try {
          PreparedStatement pstmt = connection.prepareStatement(query);
          //HERE I should add somehow auto number, but I am not sure
          //exactly how.... ???
          //set the values
          pstmt.setInt(1, staID_FK);
          pstmt.setString(2, staInfoFromFile.getCountDate() );
          pstmt.setString(3,staInfoFromFile.getDirection() );    
          pstmt.setString(4,staInfoFromFile.getConsultant());
          pstmt.setString(5, staInfoFromFile.getInstallDate() );
          pstmt.setString(6, staInfoFromFile.getInstallWeather());
          pstmt.setString(7,staInfoFromFile.getRemoveDate() );
          pstmt.setString(8,staInfoFromFile.getRemoveWeather() );
          pstmt.setString(9,staInfoFromFile.getStationType() );
          //data for testing purposes only , later get the NOW date
          //from the system.    
          pstmt.setString(10, "1/1/2009");
          //execute insert statement
          pstmt.executeUpdate();        
          
       } catch (SQLException ex) {
          StringWriter sw = new StringWriter();
          PrintWriter pw = new PrintWriter(sw);
          ex.printStackTrace(pw);
          JOptionPane.showMessageDialog ( null, new SubControllerErrorPanel("Error Occured in the Application", " Error when inserting/updating records in DB, MSSqlserver class.   \n" + sw.toString()),
                                                                                 "Submission Controller  Error",JOptionPane.ERROR_MESSAGE);
       }
           
    }

Open in new window

Kevin Cross

Remove this EV_ID_NUMBER from the INSERT statement and don't pass a value for it.

The database will take care of the autonumbering/value on insert, so you can just leave it off.

String insertQry = " insert into " + eventView +
         "(SI_ID"                             +
         ", EV_COUNT_DATE"     +
         ", EV_DIR"                        +
         " ,EV_CONS"                   +
         " ,EV_INS_DATE"            +
         " ,EV_INS_WEATHER"    +
         " ,EV_REM_DATE"           +
         " ,EV_REM_WEATER"  +
         " ,EV_STATION_TYPE"  +
         " ,EV_RECEIVE_DATE)"  +
         "VALUES (?,?,?,?,?,?,?,?,?,?)";

Open in new window

mordauth

ASKER

It was my first try.
But I received an error message.
(I did similar program in Delphi, and there a database handled auto number; however Delphi uses different database driver)
It said about trying to insert "null" value into the column, which is not allowed.
I use JDBC driver.

Kevin Cross

See if one of the 10 parameter values is returning null in your code -- use debugger of your development environment if you have one. See if the values being passed are null at any point. Either change the database column to allow nulls if column is optional or change code to pass "" for any nulls you find.

mordauth

ASKER

I used the debugger.
However, I think I have to change a method I use for Insert.
Using prepare statement is not going to work with AutoGenerated ID.
I found some refence about the following method: executeUpdate(String sql, int autoGeneratedKeys)
I think I have to change my insert into regular Sql statement and execute it with this method.

Kevin Cross

Cool. Glad you found that. You should select your comment as solution if it works so future readers will know that solves it.

mordauth

ASKER

Thanks for the advice.
Before I do it...I have to test it if it actually works, then I can post a solution

ASKER CERTIFIED SOLUTION

mordauth

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial