Java

java.io.IOException: Could not connect to capture device
javax.media.NoDataSourceException: Error instantiating class: com.sun.media.protocol.vfw.DataSource : java.io.IOException: Could not connect to capture device

<pre lang="java">

public static void main(String[] args) {
        int i=1;
        int f=0;
        while (i <=8){
            f=f+i;
            i++;

        }System.out.println(Math.pow(f, 2));
    }

}

import java.sql.*;

public class selectStmt {
	private static final String DB_DRIVER = "com.mysql.jdbc.Driver";
	private static final String DB_CONNECTION = "jdbc:mysql://127.0.0.1:3306/abo";
	private static final String DB_USER = "username";
	private static final String DB_PASSWORD = "pswd";
	
	public selectStmt(){
		try {
			 
			selectRecordsFromTable();
 
		} catch (SQLException e) {
 
			System.out.println(e.getMessage());
 
		}
 
	}
 
	private static void selectRecordsFromTable() throws SQLException {
 
		Connection dbConnection = null;
		PreparedStatement preparedStatement = null;
 
		String selectSQL = "SELECT * FROM abo.pathitems where ObjectID=1";
 
		try {
			dbConnection = getDBConnection();
			preparedStatement = dbConnection.prepareStatement(selectSQL);
			//preparedStatement.setInt(1, 100);
			
			// execute select SQL stetement
			ResultSet rs = preparedStatement.executeQuery();
 
			while (rs.next()) {
                            
				/*  how can i use GeneralPath class here and its functions such as moveTo() and curveTo() to pass all points properly */
			}
 
		} catch (SQLException e) {
 
			System.out.println(e.getMessage());
 
		} finally {
 
			if (preparedStatement != null) {
				preparedStatement.close();
			}
 
			if (dbConnection != null) {
				dbConnection.close();
			}
 
		}
 
	}
 
	private static Connection getDBConnection() {
 
		Connection dbConnection = null;
 
		try {
 
			Class.forName(DB_DRIVER);
 
		} catch (ClassNotFoundException e) {
 
			System.out.println(e.getMessage());
 
		}
 
		try {
 
			dbConnection = DriverManager.getConnection(
                             DB_CONNECTION, DB_USER,DB_PASSWORD);
			return dbConnection;
 
		} catch (SQLException e) {
 
			System.out.println(e.getMessage());
 
		}
 
		return dbConnection;
	}

}

I am looking for making a database program by myself, but I don't want to end up in a dead end for some reason, so I need ton of examples and even better the entire source code of a sample database program. Any good book for this?

I don't care about the theory. I just want to know how to make a db program and then focus on using design patterns to improve the code.

Also, I am looking for a good book on Java Swing so I end up knowing all the ins and outs of Java Swing. I want tons of examples.