SQL INSERT trouble- please help

Question

I'm having an trouble,to INSERT a record to my db.(MySQL)
This is the condition.
There is a form to validate the NicNo,which is input by the user.If it it exist, then the system displays an error msg. If it is not,display a new form to enter the candidate details.Then the user can save them to the db.These are working well.But,when I go to the mySQL console and check,the record is nicely saved except 2 fields.(civilStatus and eduQua).
Did you know why? I check my prepared statement,I think it's OK.
Here are the codes:
The form which is used by the user to input NicNo.
<%@ page session="false" %>
<%@ page import="java.sql.*,java.util.*,javax.servlet.http.*" %>
<form method="POST" action="EntInterProcess.jsp">
    <center>
        <div align="center">
    <center>
   <TABLE borderColor=burlywood cellSpacing=0 cellPadding=1
            width="256" borderColorLight=moccasin border=1>
      <tr>
        <td noWrap style="background-color: #DEB887" width="80"><B>NIC No</b></td>
        <td width="106">
        <input type="text" name="nicno" size="14" style="border:1px solid #0000FF;
color: #FF0000; font-weight: bold"></td>
        <td width="56"><input type="submit" value="Select" name="B1"></td>
      </tr>
     </table>
       </center>
  </div>
</form>The file called "EntInterProcess.jsp"
<%@ page import="core.CandidateMgr" %>
<jsp:useBean id="CandidateMgr" class="core.CandidateMgr" scope="session"/>
<jsp:setProperty name="CandidateMgr" property="*"/>
<%
String nextPage ="MainForm.jsp";
if(CandidateMgr.verifyNicNo()){
     nextPage="InterviewForm.jsp";
     }else{
     nextPage="ExitError.jsp";
%><jsp:forward page="<%=nextPage%>"/>I didn't copy here the page called "InterviewForm.jsp",because it has many fields.If you want please tell me.So I copy here the CandidateMgr.java file, which is the javaBean.
package core;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CandidateMgr
   private String nicno;
   private String name
   private String address;
   private String civilStatus;
   private String tele;
   private String eduQua;
     // Constructor
     public CandidateMgr()
   * Returns the nicno.
   public String getNicno()
      return nicno;
   * Sets the nicno.
   public void setNicno(String nicno)
      this.nicno = nicno;
   * Returns the name.
   public String getName()
      return name;
   * Sets the name.
   public void setName(String name)
      this.name = name;
   * Returns the address.
   public String getAddress()
      return address;
   * Sets the address.
   public void setAddress(String address)
      this.address = address;
   * Returns the civilStatus.
   public String getCivil()
      return civilStatus;
   * Sets the civilStatus.
   public void setCivil(String civilStatus)
      this.civilStatus= civilStatus;
   * Returns the tele.
   public String getTele()
      return tele;
   * Sets the tele.
   public void setTele(String tele)
      this.tele= tele;
   * Returns the eduQua.
   public String getEdu()
      return eduQua;
   * Sets the eduQua.
   public void setEdu(String eduQua)
      this.eduQua= eduQua;
     public boolean verifyNicNo(){
          boolean nic_no_select_ok = false;
          String nic="xxxx";
          try{
               String DRIVER = "com.mysql.jdbc.Driver";
               java.sql.Connection conn;
               String URL = "jdbc:mysql://localhost:3306/superfine";
                //Open the database
               Class.forName(DRIVER).newInstance();
               Connection con=null;
               PreparedStatement pstmt1 = null;
               con = DriverManager.getConnection(URL);
               String sql="SELECT * FROM Candidate where nicNo= ?";          
               pstmt1 = con.prepareStatement(sql);
               pstmt1.setString(1,nicno);
               ResultSet rs1 = pstmt1.executeQuery();
                            while(rs1.next()){
                    nic=rs1.getString("nicNo");
               if(nic=="xxxx")
                    nic_no_select_ok = true;
               } else{
                    nic_no_select_ok = false;     
               rs1.close();
                       pstmt1.close();
               con.close();
            catch(ClassNotFoundException e1){
               System.err.println(e1.getMessage());
            catch(SQLException e2){
                       System.err.println(e2.getMessage());
           catch (java.lang.InstantiationException e3) {
                System.err.println(e3.getMessage());
          catch (java.lang.IllegalAccessException e4) {
                System.err.println(e4.getMessage());
          catch (java.lang.NullPointerException e5){
               System.err.println(e5.getMessage());
          return nic_no_select_ok;
     public boolean addInter(){
          boolean add_inter_ok = false;
          try{
               String DRIVER = "com.mysql.jdbc.Driver";
               java.sql.Connection conn;
               String URL = "jdbc:mysql://localhost:3306/superfine";
                //Open the database
               Class.forName(DRIVER).newInstance();
               Connection con=null;
               PreparedStatement pstmt3=null;
               con = DriverManager.getConnection(URL);
               String sqle ="INSERT INTO Candidate VALUES(?,?,?,?,?,?)";
               pstmt3 = con.prepareStatement(sqle);
               //assign value for ???
               pstmt3.setString(1, nicno);
               pstmt3.setString(2, name);
               pstmt3.setString(3, address);
               pstmt3.setString(4, civilStatus);
               pstmt3.setString(5, tele);
               pstmt3.setString(6, eduQua);
               if(pstmt3.executeUpdate()==1) add_inter_ok=true;
               pstmt3.close();
                       con.close();
            catch(ClassNotFoundException e1){
               System.err.println(e1.getMessage());
            catch(SQLException e2){
                       System.err.println(e2.getMessage());
           catch (java.lang.InstantiationException e3) {
                System.err.println(e3.getMessage());
          catch (java.lang.IllegalAccessException e4) {
                System.err.println(e4.getMessage());
          return add_inter_ok;
}These are the codes which I use to do this task.I don't know what happend to that 2 fields(they save in the db as NULL).Is there a nice method to do this database declaration? I try to declare that part as
a seperate class,but I don't know how to code that by using java and call it to other sections for reuse.
Anyone can answer these questions,please tell me how to do this,because it's urgent.
Thanks.

Answer 1

Hi Casabianca,
Your code looks okay. I have just a couple of questions:
(1) Are you 100% certain that those columns are of type VARCHAR/String in your MySQL database?
(2) You only have a default ctor for your core.CandidateMgr class, and it has no implementation at all. That means that the six private member Strings are all set to null.
Your addInter() method inserts the current values of the private data members into MySQL. If it so happened that those two fields, civilStatus and eduQua, were never initialized using calls to their respective setters, then their values would still be null because you never set them to sensible values inside the constructor.
I'd do two things:
(1) Add code to your default constructor to set all the strings to the empty string.
(2) Write a second constructor that allows a user to initialize all six strings when the object is created. That way you can have a fully-initialized instance of CandidateMgr without having to call the setters. Have your default ctor simply call this second ctor:
public CandidateMgr()
    this("", "", "", "", "", "");
public CandidateMgr(final String nicno, final String name, final String address, final String civilStatus, final String tele, final String eduQua)
  this.nicno = nicno;  
  this.name  = name;
  this.address = address;  
  this.civilStatus = civilStatus;  
  this.tele = tele;  
  this.eduQua = eduQua;
}Always write a constructor so the object is ready for use right away.
See if that fixes your problem. The JDBC code looks okay.