• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 239
  • Last Modified:

Result set won't return value

Hi all

I have a really weird problem.

I have a java file that I'm trying to instantiate from values in a SQL Server database table.

I can connect to the database ok and start getting values from the view that I'm interested:

        try
        {      
              String strSQL = "SELECT * FROM qryCompliance_Officers WHERE Name_User = '" + strUsername + "'";
              Statement stmt = null;
              stmt = dbConnLogin.createStatement();
              ResultSet rs = null ;
              rs = stmt.executeQuery(strSQL);                
                  
                  rs.next();                        
                  
                  this.strName_User = strUsername;
                  this.strF_Name = rs.getString("F_Name");             
                  this.strL_Name = rs.getString("L_Name");
                  this.strFull_Name = rs.getString("Full_Name");
                  this.lngPosition_ID = rs.getLong("Position_ID");
                  this.strPosition = rs.getString("Position");

As you can see I have read a value from the resultset a total of 6 times.

The weird thing is as soon as I try to read another value:

this.lngOffice_ID = rs.getLong("Office_ID");

it throws a SQLException error with an error value of 0.  The column I am interested in exists, I even used the findColumn method of resultset to confirm it is there.  Similarly if I place:

this.lngOffice_ID = rs.getLong("Office_ID");

at the top of the list i.e.

                                                this.lngOffice_ID = rs.getLong("Office_ID");
                  this.strName_User = strUsername;
                  this.strF_Name = rs.getString("F_Name");             
                  this.strL_Name = rs.getString("L_Name");
                  this.strFull_Name = rs.getString("Full_Name");
                  this.lngPosition_ID = rs.getLong("Position_ID");
                  this.strPosition = rs.getString("Position");

that statement executes ok but then an error is thrown at the last line:

this.strPosition = rs.getString("Position");

It is as if all I can do is call something from the recordset a total of six times before it refuses to do any more.

Any help appreciated, I am completely at a loss.

Phil
0
pmccar06
Asked:
pmccar06
4 Solutions
 
CEHJCommented:
You need to call rs.next in a loop and only retrieve values if it returns true:


ResultSet rs = stmt.executeQuery(strSQL);              
while (rs.next()) {
    // Now get them
}                    
0
 
koppchaCommented:
Please try this
1> Instead  of "SELECT * FROM qryCompliance" try SELECT F_Name,L_Name,...
list all the columns you want to retrieve.
2>When the SQLException is thrown could you try to get the exact message it is throwing
catch(SQLException e) {
System.out.println(e.getMessage());
}
0
 
mukundha_expertCommented:

Use ResultSetMetaData to find the number of columns its returning.
also check whether all the columns are returning,
ResultSetMetadata rms = rs.getMetaData () ;
for ( int i = 0 ; i < rms.getColumnCount() ; i ++ )
System.out.println (  rms.getColumnLabel ( i )  );


0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
objectsCommented:
> You need to call rs.next in a loop and only retrieve values if it returns true:

unnecessary, and a row is already being returtned anyway

you could add an if, but it won't fix your probl;em.

               if (rs.next()) {
                  this.strName_User = strUsername;
                  this.strF_Name = rs.getString("F_Name");          
                  this.strL_Name = rs.getString("L_Name");
                  this.strFull_Name = rs.getString("Full_Name");
                  this.lngPosition_ID = rs.getLong("Position_ID");
                  this.strPosition = rs.getString("Position");

Not sure whats the cause of your problem, perhaps try a different driver. your code looks fine
0
 
pmccar06Author Commented:
Hi all

It turned out that my problem was something to do with the order that I was getting the column values.  If I changed by code so that the values were read in the order in which they appear in the query (view), then the problem dissapeared.  Don't ask me why, still weird, but solved the issue.

I tried to split the points the best way I could.  koppcha you post helped me the most of all, especially using the getMessage method from the error object.

Thanks all for your help.

Cheers Phil
0
 
CEHJCommented:
:-)
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Tackle projects and never again get stuck behind a technical roadblock.
Join Now