Listing of League DAO Interface in Java

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Example 93 Listing of League DAO Interface
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package comleagueplanetdao; import javautilSet; import import import import import import comleagueplanetmodelGame; comleagueplanetmodelLeague; comleagueplanetmodelLocation; comleagueplanetmodelPlayer; comleagueplanetmodelSchedule; comleagueplanetmodelTeam;
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public interface LeagueDAO { public public public public public public public public public } Game findGame(long id); League findLeague(long id); Location findLocation(long id); Player findPlayer(long id); Schedule findSchedule(long id); Team findTeam(long id); Set getSchedulesForLeague(String league); Set findLeaguesWithName(String name); void save(League newLeague);
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Iteration 2: Data Layer
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2 The DAO implementation for the game objects is prototypical of any Java application that uses JDBC The DAO connects to the leaguedb database, creates an SQL query, and executes it It then processes the result set to convert rows into game objects Finally, it closes the connection and returns the results This example only maps the game object Mappings for others, such as schedule and league objects, are left incomplete (see Example 94)
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Example 94 Listing of IceHockeyJdbcDAOImpljava
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package comleagueplanetdaoexample; import import import import import import import import import import import import import import import import import import javasqlConnection; javasqlDriverManager; javasqlResultSet; javasqlSQLException; javasqlStatement; javasqlTime; javatextParseException; javautilCalendar; javautilHashSet; javautilSet; comleagueplanetdaoLeagueDAO; comleagueplanetmodelGame; comleagueplanetmodelLeague; comleagueplanetmodelLocation; comleagueplanetmodelPlayer; comleagueplanetmodelSchedule; comleagueplanetmodelScore; comleagueplanetmodelTeam;
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public class IceHockeyJdbcDAOImpl implements LeagueDAO { // singleton DAO private static IceHockeyJdbcDAOImpl leagueDAO = null; public static LeagueDAO getLeagueDAO() { if (leagueDAO == null) { leagueDAO = new IceHockeyJdbcDAOImpl(); } return leagueDAO; } private Connection openConnection() throws ClassNotFoundException, SQLException { Connection connection; ClassforName("orgapachederbyjdbcEmbeddedDriver"); connection = DriverManager getConnection("jdbc:derby:C:\\leaguedb"); return connection; } private void closeConnection(Connection connection) { if (connection != null)
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CHAPTER 9 The Persistence Tier
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try { connectionclose(); } catch (SQLException e) { } } public League findLeague(long id) { // TODO: Add mappings for leagues and schedules League league = new League(id, "Rosehill Girl s Hockey League"); leaguegetSchedules()add(findSchedule(1)); return league; } public Schedule findSchedule(long id) { // TODO: Add mappings schedules Schedule schedule = new Schedule(id, "2005/6 Regular Season"); Connection connection = null; Statement statement = null; ResultSet resultset = null; try { connection = openConnection(); String QUERY = "SELECT * FROM APPGAME WHERE SCHEDULEID=" + id; statement = connectioncreateStatement(); resultset = statementexecuteQuery(QUERY); while (resultsetnext()) { Game game = createGameFromResultSet(resultset); schedulegetEvents()add(game); } } catch (Exception e) { eprintStackTrace(); } finally { closeConnection(connection); } return schedule; } private Game createGameFromResultSet(ResultSet rs) throws SQLException, ParseException { Game game = new Game(); gamesetId(rsgetInt("ID")); Calendar dateAndTime = CalendargetInstance(); Time time = rsgetTime("TIME"); dateAndTimesetTime(rsgetDate("DATE")); dateAndTimeset(CalendarHOUR_OF_DAY, timegetHours() + 1); dateAndTimeset(CalendarMINUTE, timegetMinutes() + 1); gamesetDateAndTime(dateAndTime); gamesetLocation(new Location(0, rsgetString("ARENA"))); Team homeTeam = new Team(); homeTeamsetName(rsgetString("HOME")); gamesetHome(homeTeam); Team visitorTeam = new Team(); visitorTeamsetName(rsgetString("VISITOR")); gamesetVisitor(visitorTeam);
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Iteration 2: Data Layer
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Score gameScore = new Score(IntegerparseInt(rs getString("HOMESCORE")), IntegerparseInt(rs getString("VISITORSCORE"))); gamesetScore(gameScore); return game; } // TODO: Add mappings later public Set getSchedulesForLeague(String league) { return null; } public Set findLeaguesWithName(String name) { return null; } public void save(League newLeague) { } public Game findGame(long id) { return null; } public Location findLocation(long id) { return null; } public Team findTeam(long id) { return null; } public Player findPlayer(long id) { return null; } }
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3 To complete the persistence layer, replace the example DAO from 8, which provides in-memory samples, with the class just defined Your data layer abstracts persistence properly, so this change will be transparent to the business and presentation tiers In the IceHockeyFacade class, find the line where the DAO is set and replace it with the singleton from the new IceHockeyJdbcDAOImpl class (see Example 95)
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Example 95 Listing of the IceHockey Jdbc DAO Implementation
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package comleagueplanetservices; import import import import import comleagueplanetdaoLeagueDAO; comleagueplanetdaoexampleIceHockeyDAOImpl; comleagueplanetdaoexampleIceHockeyJdbcDAOImpl; comleagueplanetservicesLeagueFacade; comleagueplanetservicesimplLeagueFacadeImpl;
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CHAPTER 9 The Persistence Tier
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public class IceHockeyFacade { private static LeagueFacade facade = null; public static LeagueFacade getLeagueFacade() { if (facade == null) { init(); } return facade; } private static void init() { // create a new facade implementation LeagueFacadeImpl facadeImpl = new LeagueFacadeImpl(); // point the facade at the dao for the ice hockey league LeagueDAO dao = IceHockeyJdbcDAOImplgetLeagueDAO(); facadeImplsetLeagueDAO(dao); facade = facadeImpl; } }
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4 Now you can test your persistence tier with the Web application from 8 If you do not have it available, import the source code to create the dynamic Web project named LeaguePlanetWeb or refer to the instructions in Building a Web Client in 8 5 Before testing, the Derby libraries that contain the JDBC drivers must be added to the Java classpath of the application server Copy derbyjar and derbyclientjar from your Derby installation to JBOSS_HOME/server/ default/lib If you are not using JBoss, check the documentation for your application server for instructions 6 Open the Web project WebContent folder, right click on the schedulejsp file, and invoke the Run As Run on Server command WTP will start the server, deploy the application, and launch the browser to display the games (see Figure 914)
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Derby Embedded Mode Accessing the Derby database in a single-user embedded mode will work fine for the application in this example However, if multiple applications need to access the same Derby database, or concurrent requests are made to the Web application, Derby must be used in the shared (networked) mode Refer to the Derby documentation to use Derby in the shared mode Change the JDBC URL to one that can connect to the networked database
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