hi friend,

try the following code below :

import java.sql.*;
import java.awt.*;
import javax.swing.*;

import java.awt.event.*;
public class  FetchDataIntoJTextArea implements ActionListener{
    JTextField textbox = new JTextField();
    JTextArea textarea=new JTextArea(5,20); 
    JButton b=new JButton("Patient History");
    String driverName = "com.mysql.jdbc.Driver";
    String url = "jdbc:mysql://localhost:3306/record";
    String userName = "root";
    String password = "root";
    public void createUI()
    {
        JFrame f=new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
        f.setLayout(null);
        JLabel tbLabel = new JLabel("Patient Name : ");
        JLabel taLabel=new JLabel("Patient History : ");        
        b.addActionListener(this);      


        tbLabel.setBounds(10, 30, 100, 20);
        textbox.setBounds(120,30,150,20);
        taLabel.setBounds(10,60,100,20);
        textarea.setBounds(120,60,150,60);
        b.setBounds(120,130,150,20);       

        f.add(tbLabel);
        f.add(textbox);
        f.add(taLabel);        
        f.add(textarea);
        f.add(b);
        f.setVisible(true);
        f.setSize(400,300);
    }
    public static void main(String[] args){
        FetchDataIntoJTextArea dd = new FetchDataIntoJTextArea();
        dd.createUI();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        b = (JButton)e.getSource();     
        getOperation();
    }
    public void getOperation()
    {
        String textboxValue = textbox.getText();        
        try
        {
            Class.forName(driverName);
            Connection con = DriverManager.getConnection(url, userName, password);
            String sql = "select pHistory from patient where pName" +
                    " = '"+textboxValue+"'";
            PreparedStatement ps = con.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();           
            while(rs.next())
            {                  
                textarea.setText(rs.getString("pHistory"));             
            }

            JOptionPane.showMessageDialog(null, "Retrieved data succesfully." +
                    "","Record Retrieved",
                    JOptionPane.INFORMATION_MESSAGE);
        }
        catch(Exception ex)
        {
            JOptionPane.showMessageDialog(null, ex.getMessage(),"Error",
                    JOptionPane.ERROR_MESSAGE);
        }           
    }    
}