Problems in Retrieve Server's Data from Client through RMI

Question

//I feel that this question quite challenging for me. maybe it is easy for you all. anyway, so anybody if know it, pls point out my mistake and give some opinion on my programs.thanks....
/*I have written one retrieve method in my server that is going to
be called by the client�s pc. But I am facing the error when
running
it. The error is � SQL Error in retrieve statemet:
[Microsoft][ODBC
Microsoft Access
Driver] Data type mismatch in criteria expression.� So anybody
know
where is my mistakes? Is it my server retrieveData method wrong? Or
my client is calling not properly? Thanks.
Actually my expected result is when client pc input the particular
staff id , then the client textfield will show all the information
of that particular staff according to the input id to the client
interface text field. */
******************* Interface *****************************
public interface RemoteDBServer extends
java.rmi.Remote //RemoteDBServer interface
     public String retrieveData(String idd, String ln, String
fn, String op, String oe, String hp, String ps, String ss) throws
java.rmi.RemoteException;
*************** Server Program ***********************************
//id, last_name, first_name, office_phone, office_ext��..is a
table�s attribute name
//the jdbc and odbc path already been set in control panel �
administrative tools.
public String retrieveData(String idd) throws
java.rmi.RemoteException
          String result=" ";
          try
          //create a statement
          Statement statement = connection.createStatement();
     String sql="SELECT * FROM emp_overview WHERE id ='"+idd+"'";
          //execute quury and capture results
          ResultSet rs = statement.executeQuery(sql);
          rs.next();
               String ln = rs.getString("last_name");
               String fn = rs.getString("first_name");
               String op = rs.getString("office_phone");
               String oe = rs.getString("office_ext");
               String hp = rs.getString("home_phone");
               String ps = rs.getString("primary_skill");
          String ss = rs.getString("secondary_skill");
               statement.close();
          catch (SQLException sqlex)
     System.out.println("SQL Error in retrieve statement: "
+sqlex);
          sqlex.printStackTrace();
     return result;
****************************Client Program ************************
..............����
//findName already declared in JButton
//tln, tfn, top, toe�..already declared in JTextField
else if (event.getSource() == findName)
               try
                    db.retrieveData(tid.getText());
                    tln.setText("");
                    tfn.setText("");
                    top.setText("");
                    toe.setText("");
                    thp.setText("");
                    tps.setText("");
                    tss.setText("");
               catch(Exception e)
          System.out.println ("Cant delete to server " + e);

Answer 1

Hi Kevin,
It looks like your id field is of Numeric datatype and you are wrapping it with single quotes in your query, which is not correct.
Your wrote :
String sql="SELECT * FROM emp_overview WHERE id ='"+idd+"'";
If id is of type numeric data type then, use:
String sql="SELECT * FROM emp_overview WHERE id ="+idd;
regards,
Humayun