StorageLib.java

public static void set(String playerName, int number) {                                                             
    try {                                                                                                           
        PreparedStatement checkStatement = connection.prepareStatement("SELECT ? FROM ? WHERE ? = ?;");             
        checkStatement.setString(1, INT_COLUMN);                                                                    
        checkStatement.setString(2, MYSQL_TABLE);                                                                   
        checkStatement.setString(3, USER_COLUMN);                                                                   
        checkStatement.setString(4, playerName);                                                                    
        if (checkStatement.executeQuery().next()) {                                                                 
          PreparedStatement updateStatement = connection.prepareStatement("UPDATE ? SET ? = ? WHERE ? = ?;");       
          updateStatement.setString(1, MYSQL_TABLE);                                                                
          updateStatement.setString(2, INT_COLUMN);                                                                 
          updateStatement.setInt(3, number);                                                                        
          updateStatement.setString(4, USER_COLUMN);                                                                
          updateStatement.setString(5, playerName);                                                                 
          updateStatement.execute();                                                                                
        } else {                                                                                                    
            PreparedStatement createStatement = connection.prepareStatement("INSERT INTO ? (?, ?) VALUES (?, ?);"); 
            createStatement.setString(1, MYSQL_TABLE);                                                              
            createStatement.setString(2, USER_COLUMN);                                                              
            createStatement.setString(3, INT_COLUMN);                                                               
            createStatement.setString(4, playerName);                                                               
            createStatement.setInt(5, number);                                                                      
            createStatement.execute();                                                                              
        }                                                                                                           
    } catch (SQLException ex) {                                                                                     
        ex.printStackTrace();                                                                                       
    }                                                                                                               
}