Java - database problem

Question

Hello again!
We tried to make some changes to the program we sent before.
In this program the user writes a string in a text field and then he pushes the button "send". Once this button is pushed, the content of the textfield is supposed to be written into a table (named TITLES) of a database.
The problem is that only the initiallized value of the string is sent to the database instead of what the user types. We know that the string str takes the right value from the actionPerformed method but it can not be seen by the class insertToTiltles.
Can you please tell us how we can insert the str value into the database? Thanks in advance. We send you our code:
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
public class insertToTitles
    public static void main (String args[])
        String driverClassName = "sun.jdbc.odbc.JdbcOdbcDriver";
        String url             = "jdbc:odbc:titledb";
        Connection dbConnection;
          Statement  statement = null ;
          String str="initial value";
        try
             Class.forName (driverClassName) ;
        catch(java.lang.ClassNotFoundException e)
             System.err.print("ClassNotFoundException: ");
             System.err.println(e.getMessage());
        try
             dbConnection = DriverManager.getConnection (url, "", "") ;
             statement = dbConnection.createStatement () ;
             GUI application=new GUI();
               application.setLocation(0,0);
              application.setSize(400,250);
              application.setVisible(true);
             statement.executeUpdate("INSERT INTO TITLES"+"(SITE_NAME)"+"VALUES"+"('"+str+"')");
             statement.close () ;
             dbConnection.close () ;
        catch(SQLException ex)
             System.err.println("SQLException: " + ex.getMessage());
class GUI extends Frame implements ActionListener
     TextField txt;
     //TextField txt2;
       Button button;
       FlowLayout fl;
       String str;
       GUI()
            fl=new FlowLayout();
          this.setLayout(fl);
            txt=new TextField(50);
        add(txt);
         button=new Button("Send");
         button.addActionListener(this);
         add(button);
         //txt2=new TextField(50);
        //add(txt2);
    public void actionPerformed(ActionEvent e)
         String str=txt.getText();
}

Answer 1

hi,
can u test the following program,
thanks
ss
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
public class InsertToTitles
     static String driverClassName = "sun.jdbc.odbc.JdbcOdbcDriver";
static String url = "jdbc:odbc:titledb";
public static void main (String args[])
     GUI application=new GUI();
               application.setLocation(0,0);
          application.setSize(400,250);
          application.setVisible(true);
static void insertMethod(String str)
     Connection dbConnection;
Statement statement = null ;
try
     Class.forName (driverClassName) ;
catch(java.lang.ClassNotFoundException e)
     System.err.print("ClassNotFoundException: ");
     System.err.println(e.getMessage());
try
     dbConnection = DriverManager.getConnection (url, "", "") ;
     statement = dbConnection.createStatement () ;
     System.out.println(str);
     statement.executeUpdate("INSERT INTO TITLES(SITE_NAME)VALUES('"+str+"')");
     statement.close () ;
     dbConnection.close () ;
catch(Exception ex)
     System.err.println("SQLException: " + ex.getMessage());
class GUI extends Frame implements ActionListener
     TextField txt;
     //TextField txt2;
     Button button;
     FlowLayout fl;
     String str;
     GUI()
          fl=new FlowLayout();
          this.setLayout(fl);
          txt=new TextField(50);
add(txt);
     button=new Button("Send");
     button.addActionListener(this);
     add(button);
     //txt2=new TextField(50);
//add(txt2);
public void actionPerformed(ActionEvent e)
     InsertToTitles.insertMethod(txt.getText());
}