gone wrong

dump.txt

package avans.model;

import avans.database.Database;

import java.util.LinkedHashMap;

public class Lobby {
	/**
	 * Username of a player.
	 */
	private LinkedHashMap<Integer, String > username;

	public Lobby(){
		username = new LinkedHashMap<>();
	}

	public boolean isLoginCredentialValid( String username, String password ){
		String Query = String.format( username, password , "Select count( username ) from account where username = \"%s\" and wachtwoord = \"%s\"" );
		Database.query( Query );
		return false;
	}
}
/**
 * Mysql Utilities
 *
 * @author Ralph Ritoch <rritoch@gmail.com>
 * @copyright Ralph Ritoch 2011 ALL RIGHTS RESERVED
 * @link http://www.vnetpublishing.com
 *
 */

package avans.database;

public class MySQLUtils {

	/**
	 * Escape string to protected against SQL Injection
	 *
	 * You must add a single quote ' around the result of this function for data,
	 * or a backtick ` around table and row identifiers.
	 * If this function returns null than the result should be changed
	 * to "NULL" without any quote or backtick.
	 *
	 * @param link
	 * @param str
	 * @return
	 * @throws Exception
	 */

	public static String mysql_real_escape_string(java.sql.Connection link, String str)
			throws Exception
	{
		if (str == null) {
			return null;
		}

		if (str.replaceAll("[a-zA-Z0-9_!@#$%^&*()-=+~.;:,\\Q[\\E\\Q]\\E<>{}\\/? ]","").length() < 1) {
			return str;
		}

		String clean_string = str;
		clean_string = clean_string.replaceAll("\\\\", "\\\\\\\\");
		clean_string = clean_string.replaceAll("\\n","\\\\n");
		clean_string = clean_string.replaceAll("\\r", "\\\\r");
		clean_string = clean_string.replaceAll("\\t", "\\\\t");
		clean_string = clean_string.replaceAll("\\00", "\\\\0");
		clean_string = clean_string.replaceAll("'", "\\\\'");
		clean_string = clean_string.replaceAll("\\\"", "\\\\\"");

		if (clean_string.replaceAll("[a-zA-Z0-9_!@#$%^&*()-=+~.;:,\\Q[\\E\\Q]\\E<>{}\\/?\\\\\"' ]"
				,"").length() < 1)
		{
			return clean_string;
		}

		java.sql.Statement stmt = link.createStatement();
		String qry = "SELECT QUOTE('"+clean_string+"')";

		stmt.executeQuery(qry);
		java.sql.ResultSet resultSet = stmt.getResultSet();
		resultSet.first();
		String r = resultSet.getString(1);
		return r.substring(1,r.length() - 1);
	}

	/**
	 * Escape data to protected against SQL Injection
	 *
	 * @param link
	 * @param str
	 * @return
	 * @throws Exception
	 */

	public static String quote(java.sql.Connection link, String str)
			throws Exception
	{
		if (str == null) {
			return "NULL";
		}
		return "'"+mysql_real_escape_string(link,str)+"'";
	}

	/**
	 * Escape identifier to protected against SQL Injection
	 *
	 * @param link
	 * @param str
	 * @return
	 * @throws Exception
	 */

	public static String nameQuote(java.sql.Connection link, String str)
			throws Exception
	{
		if (str == null) {
			return "NULL";
		}
		return "`"+mysql_real_escape_string(link,str)+"`";
	}

}