I am trying to send data from textfield to database but it is showing error "ORA-12899: value too large for column "HR"."DOCTORS"."NAME" (actual: 658, maximum: 20)"

Question

Although i am entering only one character into the textfield then too it is reflecting the same error.
private void initEvents()
  okButton.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
  Connection conn = null;
    Statement stmt = null;
    try{
       //STEP 2: Register JDBC driver
       Class.forName("oracle.jdbc.driver.OracleDriver");
       //STEP 3: Open a connection
       System.out.println("Connecting to database...");
       conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","hr","hr");
       //STEP 4: Execute a query
       System.out.println("Creating statement...");
       stmt = conn.createStatement();
       System.out.println(txtField);
       String sql = "INSERT INTO DOCTORS VALUES ('"+txtField+"','"+textField_1+"','"+textField_1+"','"+textField_2+"','"+textField_3+"')";
       JOptionPane.showMessageDialog(null,"Inserted Successfully!");
       ResultSet rs = stmt.executeQuery(sql);
       rs.close();
       stmt.close();
       conn.close();
    }catch(SQLException se){
       //Handle errors for JDBC
       se.printStackTrace();
    }catch(Exception e1){
       //Handle errors for Class.forName
       e1.printStackTrace();
    }finally{
       //finally block used to close resources
       try{
          if(stmt!=null)
             stmt.close();
       }catch(SQLException se2){
       }// nothing we can do
       try{
          if(conn!=null)
             conn.close();
       }catch(SQLException se){
          se.printStackTrace();
       }//end finally try
    }//end try

Answer 1

What is a the size of the text you are trying to insert?
Have you tried the increasing the size of 'Name' column to 658?
Most likely the size of Name column is 20. This isn't enough to fit in the value you are trying to insert.
You can increase the size of the Name column with alter table Hr.doctors modify ( Name column_type (658));
Let me know if this helps.
Regards,
Suntrupth