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Simple Exchange Application

Distributed Systems Lab Lecture -1-. Simple Exchange Application. Project Description. It is extremely simplified application will be realized with the aid of various middleware technologies.

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Simple Exchange Application

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  1. Distributed Systems LabLecture -1- Simple Exchange Application

  2. Project Description • It is extremely simplified application will be realized with the aid of various middleware technologies. • It allows the retrieval of information on market prices and exchange rate developments, as well as managing the stock deposit. • The application will also allows the user to play a game during observing the prices of the stock market. • such Sudoku, Zuma or else. Distributed Systems Lab

  3. Application Database • It will be MySQL database stores the companies prices in the market and users login and balance details. • The database tables will be: • CO_Name • CO_ID (primary key): ID of the limited company and it is an integer. • CO_NAME: String, name of the company. • CO_Data: • ID (primary key): it is an integer. • C_ID: ID of the company, which is integer also. • DAY: we will assume that has taken place every working day trade and day as an integer number (1 .. 31). • SHARE_VALUE: Current share price that day and it is a double number (0.01 to 9999.99 EUR). Distributed Systems Lab

  4. Application Database Cont. • USER • U_ID (primary key): ID of the limited company and it is an integer. • U_NAME: String, name of the company. • U_PSWD: • USER_TRANS: // user transaction history • ID (primary key): it is an integer. • C_ID: ID of the company, which is integer also. • U_ID: • DAY: we will assume that has taken place every working day trade and day as an integer number (1 .. 31). • TRANS_TYPE: • AMOUNT: Current share price that day and it is a double number (0.01 to 9999.99 EUR). Distributed Systems Lab

  5. Implementation • Application will be implemented as following: • ConnectDB Class • exchangeClient Class • GameClass • Note: • Interface or abstract class. Which one should you use on the project. Distributed Systems Lab

  6. ConnectDB Class • / / Constructor, loads the DB driverpublic ConnectDB () • MySql DB url: jdbc:mysql://host_name:port/dbname • MySql Driver: com.mysql.jdbc.Driver • Class.forName("com.mysql.jdbc.Driver").newInstance(); //load the driver • Connection dcon = DriverManager.getConnection(DB url, “username", “password");//start a connection • / / Opens a connection to the databasepublic booleanOpenDB () • if(!dcon.isClosed()) // check if the connection is open • / / Closes an existing connection to the databasepublic booleanCloseDB () • dcon.close(); Distributed Systems Lab

  7. ConnectDB Class Cont. • / / Takes the SQL string from the open DB and return ResultSet. on error SQLException is thrown public ResultSet executeDB (String SQL) //define statement object to execute sql query Statement stat = dcon.createStatement();  //results of sql query returns in a ResultSet object ResultSet rs = stat.executeQuery("select * from table where “); if (!rs.next()) { //if no results found  rs.close(); stat.close(); dcon.close(); } else { // action code } • / / Returns the error message of the last executed SQL command. if the command was successful, "OK" would be returned public String getStatus () Distributed Systems Lab

  8. exchangeClient Class • public String CreateUser(String name, String pwrd) • It returns string on success like “your account is created successfully ” , or if there is any problem during the creation such as the duplication of the user name, empty field it returns message of that problem. • public String Login (String name, String pwrd) • If there is any problem during the login process such as the name is not exist in the DB it returns message of it . Otherwise it returns welcoming message. Distributed Systems Lab

  9. exchangeClient Class Cont. • public String [] GetAllCompanies () • Returns a list of all Company names in an array of strings. • public double GetValue (int x, String Company) • It returns the price of the share of the Company on day X (1 .. 31). When entering an invalid date and / or Company-name is not exist will return "-1.0". Distributed Systems Lab

  10. exchangeClient Class Cont. • public double BigWinnerGain (int X, int Y) • Investigated the stock during the period between the 2 days X (1 .. 30) and Y (X. .. 31) the largest percentage gain • With Y > X and K (X) = price at the date X has generated. The output is the percentage value of the price.   Distributed Systems Lab

  11. exchangeClient Class Cont. • public String BigWinnerCompany (int X, int Y)As the previous method, but the name of the concerned Company is returned. Distributed Systems Lab

  12. Notes • These guides to help you implementing your project. • You can add or edit if you think it convenient to your project in which you will mention it in your report. Distributed Systems Lab

  13. Resources • http://www.roseindia.net/jdbc/jdbc.shtml • http://www.stardeveloper.com/articles/display.html?article=2003090401&page=1 Distributed Systems Lab

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