Java GUI and Oracle Database

create table customer
(
CUSTOMERID varchar2(4),
NAME varchar2(50),
EMAIL varchar2(50),
COUNTRYCODE varchar2(3),
BUDGET number,
USED number
)
tablespace SYSTEM
storage
(
initial 64K
minextents 1
maxextents unlimited
);
alter table customer
add constraint PK_CUSTOMER primary key (CUSTOMERID);

INSERT INTO customer VALUES ('C001', 'Win Weerachai', '[email protected]', 'TH', 1000000, 600000);
INSERT INTO customer VALUES ('C002', 'John  Smith', '[email protected]', 'UK', 2000000, 800000);
INSERT INTO customer VALUES ('C003', 'Jame Born', '[email protected]', 'US', 3000000, 600000);
INSERT INTO customer VALUES ('C004', 'Chalee Angel', '[email protected]', 'US', 4000000, 100000);

Connection connect = null;

try {
	Class.forName("oracle.jdbc.driver.OracleDriver");
	
	connect =  DriverManager.getConnection("" +
			"jdbc:oracle:thin:@TCDB", "myuser","mypassword");

	if(connect != null){
		System.out.println("Database Connected.");
	} else {
		System.out.println("Database Connect Failed.");
	}
	
} catch (Exception e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

try {
	connect.close();
} catch (SQLException e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

package com.java.myapp;

import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.JLabel;

public class MyForm extends JFrame {
	
	Connection connect = null;
	Statement s = null;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm frame = new MyForm();
				frame.setVisible(true);
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 580, 242);
		setTitle("ThaiCreate.Com Java GUI Tutorial");
		getContentPane().setLayout(null);
		
		// Customer Label
		JLabel lblCustomer = new JLabel("Customer List");
		lblCustomer.setBounds(231, 28, 95, 14);
		getContentPane().add(lblCustomer);
		
		// ScrollPane for Table
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBounds(33, 61, 494, 90);
		getContentPane().add(scrollPane);
		
		// Table
		JTable table = new JTable();
				
		// Model for Table
		DefaultTableModel model = (DefaultTableModel)table.getModel();
		model.addColumn("CustomerID");
		model.addColumn("Name");
		model.addColumn("Email");
		model.addColumn("CountryCode");
		model.addColumn("Budget");
		model.addColumn("Used");
		
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			
			connect =  DriverManager.getConnection("" +
					"jdbc:oracle:thin:@TCDB", "myuser","mypassword");
			
			s = connect.createStatement();
			
			String sql = "SELECT * FROM  customer ORDER BY CustomerID ASC";
			
			ResultSet rec = s.executeQuery(sql);
			int row = 0;
			while((rec!=null) && (rec.next()))
            {			
				model.addRow(new Object[0]);
				model.setValueAt(rec.getString("CustomerID"), row, 0);
				model.setValueAt(rec.getString("Name"), row, 1);
				model.setValueAt(rec.getString("Email"), row, 2);
				model.setValueAt(rec.getString("CountryCode"), row, 3);
				model.setValueAt(rec.getFloat("Budget"), row, 4);
				model.setValueAt(rec.getFloat("Used"), row, 5);
				row++;
				
				/*
				 * 		model.addRow(new Object[]{
						rec.getString("CustomerID")
						,rec.getString("Name"),rec.getString("Email")
						,rec.getString("CountryCode")
						,rec.getFloat("Budget")
						,rec.getFloat("Used")
						});
				 */
            }
			rec.close();
             
		} catch (Exception e) {
			// TODO Auto-generated catch block
			JOptionPane.showMessageDialog(null, e.getMessage());
			e.printStackTrace();
		}
		
		try {
			if(s != null) {
				s.close();
				connect.close();
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		scrollPane.setViewportView(table);		

	}
}

Connection connect = null;
Statement s = null;

try {
	Class.forName("oracle.jdbc.driver.OracleDriver");
	
	connect =  DriverManager.getConnection("" +
			"jdbc:oracle:thin:@TCDB", "myuser","mypassword");
	
	s = connect.createStatement();
	
	String sql = "INSERT INTO customer " +
			"(CustomerID,Name,Email,CountryCode,Budget,Used) " + 
			"VALUES ('C005','Chai Surachai','[email protected]'" +
			",'TH','1000000','0') ";
	 s.execute(sql);
	
	 System.out.println("Record Inserted Successfully");
	 
} catch (Exception e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

try {
	if(s != null) {
		s.close();
		connect.close();
	}
} catch (SQLException e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

Connection connect = null;
Statement s = null;

try {
	Class.forName("oracle.jdbc.driver.OracleDriver");
	
	connect =  DriverManager.getConnection("" +
			"jdbc:oracle:thin:@TCDB", "myuser","mypassword");
	
	s = connect.createStatement();
	
	String sql = "SELECT * FROM  customer ORDER BY CustomerID ASC";
	
	ResultSet rec = s.executeQuery(sql);
	
	while((rec!=null) && (rec.next()))
	{
		System.out.print(rec.getString("CustomerID"));
		System.out.print(" - ");
		System.out.print(rec.getString("Name"));
		System.out.print(" - ");
		System.out.print(rec.getString("Email"));
		System.out.print(" - ");
		System.out.print(rec.getString("CountryCode"));
		System.out.print(" - ");
		System.out.print(rec.getFloat("Budget"));
		System.out.print(" - ");
		System.out.print(rec.getFloat("Used"));
		System.out.println("");
	}
	rec.close();
	 
} catch (Exception e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

try {
	if(s != null) {
		s.close();
		connect.close();
	}
} catch (SQLException e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

Connection connect = null;
Statement s = null;

try {
	Class.forName("oracle.jdbc.driver.OracleDriver");
	
	connect =  DriverManager.getConnection("" +
			"jdbc:oracle:thin:@TCDB", "myuser","mypassword");
	
	s = connect.createStatement();
	
	String sql = "UPDATE customer " +
			"SET Budget = '5000000' " +
			" WHERE CustomerID = 'C005' ";
	 s.execute(sql);
	
	 System.out.println("Record Update Successfully");
	 
} catch (Exception e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

try {
	if(s != null) {
		s.close();
		connect.close();
	}
} catch (SQLException e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

Connection connect = null;
Statement s = null;

try {
	Class.forName("oracle.jdbc.driver.OracleDriver");
	
	connect =  DriverManager.getConnection("" +
			"jdbc:oracle:thin:@TCDB", "myuser","mypassword");
	
	s = connect.createStatement();
	
	String sql = "DELETE FROM customer " +
			" WHERE CustomerID = 'C005' ";
	 s.execute(sql);
	
	 System.out.println("Record Delete Successfully");

} catch (Exception e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}

try {
	if(s != null) {
		s.close();
		connect.close();
	}
} catch (SQLException e) {
	// TODO Auto-generated catch block
	System.out.println(e.getMessage());
	e.printStackTrace();
}