Java GUI and Database Connection

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection connect =  DriverManager.getConnection("jdbc:odbc:DRIVER={Microsoft Access Driver (*.mdb)};" +
		"DBQ=C:\\java\\mydatabase.mdb;uid=;pwd=;");

Class.forName("com.mysql.jdbc.Driver");
Connection connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
		"?user=root&password=root");

Class.forName("org.mariadb.jdbc.Driver");
Connection connect =  DriverManager.getConnection("jdbc:mariadb://localhost/mydatabase" +
		"?user=root&password=root");

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection connect =  DriverManager.getConnection("" +
"jdbc:sqlserver://localhost\\SQL2008;databaseName=mydatabase;user=sa;password=");

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

Connection connect = null;

try {
	Class.forName("com.mysql.jdbc.Driver");

	connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
			"?user=root&password=root");

	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();
}

Connection connect = null;
Statement s = null;

try {
	Class.forName("com.mysql.jdbc.Driver");

	connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
			"?user=root&password=root");
	
	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("com.mysql.jdbc.Driver");

	connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
			"?user=root&password=root");
	
	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("com.mysql.jdbc.Driver");

	connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
			"?user=root&password=root");
	
	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("com.mysql.jdbc.Driver");

	connect =  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
			"?user=root&password=root");
	
	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();
}