This is Chapter 17 DataBase Java 6th edtion

Please help with tihs code thank you

import java.util.Scanner; import java.sql.*;

/** This program uses a database to keep track of summer T-ball teams, games, and season records. */

public class TeamDB { public static void main(String[] args) { // Create a named constant for the database URL // NOTE: This value is specific for Java DB final String DB_URL = "jdbc:derby:TeamDB;" + "create=true";

Connection conn;

try { // Create a connection to the database conn = DriverManager.getConnection(URL);

char choice; Scanner keyboard = new Scanner(System.in); System.out.println("Welcome to the Sports " + "Teams Database Manager!"); do { printMenu(); choice = keyboard.nextLine().charAt(0); switch(choice) { case '0': // Close the connection conn.close(); break; case '1': viewTeams(conn); break; case '2': viewSchedule(conn); break; case '3': addTeams(conn); break; case '4': addGames(conn); break; case '5': enterScores(conn); break; case '6': beginNewSeason(conn); break; } } while(choice != '0'); }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The printMenu method displays the menu choices for the user to work with the database. */

public static void printMenu() { System.out.println(); System.out.println("Select from the following " + "options:"); System.out.println("1. View team standings"); System.out.println("2. View the schedule"); System.out.println("3. Add a team"); System.out.println("4. Add a game to the schedule"); System.out.println("5. Enter game scores"); System.out.println("6. Begin a new season"); System.out.println("0. Exit the program"); }

/** The beginNewSeason method is a utility method that removes the tables and allows the user to reset the database for a new season. @param conn A connection to the database. */

public static void beginNewSeason(Connection conn) { try { Statement stmt = conn.createStatement();

// Remove the tables if they already exist // Throws an exception if the tables do not exist stmt.execute("DROP TABLE Games"); stmt.execute("DROP TABLE Teams");

// Once the tables have been removed, call the // method to create and initialize the tables System.out.println("Reinitializing database " + "for a new season"); createTeamDB(conn); }

catch(Exception ex) { // Create the tables if they do not exist System.out.println("Creating database for " + "the first time"); createTeamDB(conn); } }

/** The createTeamDB method is a utility method that creates the tables and initializes the database with teams and games. @param conn A connection to the database. */

public static void createTeamDB(Connection conn) { try { Statement stmt = conn.createStatement();

// Create the table of teams stmt.execute("CREATE TABLE Teams (" + "TeamName CHAR(15) " + "NOT NULL PRIMARY KEY, " + "Wins INT, " + "Losses INT, " + "Ties INT" + ")");

// Add some teams stmt.executeUpdate("INSERT INTO Teams " + "(TeamName) " + "VALUES ('Astros')");

stmt.executeUpdate("INSERT INTO Teams " + "(TeamName) " + "VALUES ('Marlins')");

stmt.executeUpdate("INSERT INTO Teams " + "(TeamName) " + "VALUES ('Brewers')");

stmt.executeUpdate("INSERT INTO Teams " + "(TeamName) " + "VALUES ('Cubs')");

// Create a listing of the games to be played stmt.execute("CREATE TABLE Games (" + "GameNumber INT " + "NOT NULL PRIMARY KEY, " + "HomeTeam CHAR(15) " + "NOT NULL REFERENCES " + "Teams (TeamName), " + "HomeTeamScore INT, " + "VisitorTeam CHAR(15) NOT NULL " + "REFERENCES Teams (TeamName), " + "VisitorTeamScore INT" + ")");

stmt.executeUpdate("INSERT INTO Games " + "(GameNumber, HomeTeam, " + "VisitorTeam) " + "VALUES (1, 'Astros', " + "'Brewers')");

stmt.executeUpdate("INSERT INTO Games " + "(GameNumber, HomeTeam, " + "VisitorTeam) " + "VALUES (2, 'Brewers', " + "'Cubs')");

stmt.executeUpdate("INSERT INTO Games " + "(GameNumber, HomeTeam, " + "VisitorTeam) " + "VALUES (3, 'Cubs', " + "'Astros')"); }

catch (Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The addTeams method allows the user to add more teams to the database. @param conn A connection to the database. */

public static void addTeams(Connection conn) { Scanner keyboard = new Scanner(System.in);

try { char ans; String teamName;

Statement stmt = conn.createStatement();

do { // ADD LINES FOR TASK #3 HERE // Prompt the user for a new team name // Update the Teams table

System.out.print("Do you want to enter " + "another team: "); ans = keyboard.nextLine().charAt(0);

} while(ans == 'Y'|| ans == 'y'); }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The addGames method allows the user to add games to the schedule. A unique game number is created for each game on the schedule.The user will need to supply a home team name and a visitor team name from the keyboard. @param conn A connection to the database. */

public static void addGames(Connection conn) { Scanner keyboard = new Scanner (System.in);

try { char ans; String homeTeam; String visitingTeam; int gameNumber = 1;

Statement stmt = conn.createStatement();

// Retrieve the data and count the number of // games already scheduled so that you can // add a unique game number ResultSet result = stmt.executeQuery("SELECT * " + "FROM " + "Games");

while(result.next()) { gameNumber++; }

do { System.out.print("Enter the home " + "team name: "); homeTeam = keyboard.nextLine();

System.out.print("Enter the visiting " + "team name: "); visitingTeam = keyboard.nextLine();

stmt.executeUpdate("INSERT INTO Games " + "(GameNumber, HomeTeam, " + "VisitorTeam) " + "VALUES (" + gameNumber + ", '" + homeTeam + "', '" + visitingTeam + "')");

System.out.print("Do you want to enter " + "another game: "); ans = keyboard.nextLine().charAt(0);

} while(ans == 'Y'|| ans == 'y'); }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The viewTeams method displays a table listing the team names and season records. Since teams have not yet played, all numbers are zero. @param conn A connection to the database. */

public static void viewTeams(Connection conn) { try { // Create a Statement object Statement stmt = conn.createStatement();

// Send the statement to the DBMS ResultSet result = stmt.executeQuery("SELECT * " + "FROM " + "Teams");

System.out.printf("%-15s %10s %10s %10s ", "Team Name", "Win", "Lose", "Tie");

// Display the contents of the result set // The result set will have 5 columns while(result.next()) { System.out.printf("%-15s %10d %10d %10d ", result.getString("TeamName"), result.getInt("Wins"), result.getInt("Losses"), result.getInt("Ties")); } }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The viewSchedule method retrieves and displays the teams and scores for all games. @param conn A connection to the database. */

public static void viewSchedule(Connection conn) { try { // Create a Statement object Statement stmt = conn.createStatement();

// ADD LINES FOR TASK #2 HERE // Create a string with a SELECT statement // Send the statement to the DBMS

// This is a suggested column headings display System.out.println("List of games and scores:"); System.out.printf("%-6s %-20s %6s " + "%-20s %6s ", "GameID", "Home", "Score", "Visitor", "Score");

// ADD LINES FOR TASK #2 HERE // Use a while loop to display the result set // The result set will have five columns }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } }

/** The enterScores method allows user to enter scores for both teams. The method will update the Games table with the scores entered. It will also compare the scores to determine the winning and losing teams (or tie) and update the appropriate column in the Teams table for each team involved in the game. @param conn A connection to the database. */

public static void enterScores(Connection conn) { Scanner keyboard = new Scanner(System.in); try { char ans; int gameNumber; String homeTeam; String visitingTeam; int score1; int score2; String sqlStatement; ResultSet result = null;

Statement stmt = conn.createStatement();

do { viewSchedule(conn);

System.out.print("Enter the game ID: "); gameNumber = keyboard.nextInt();

// ADD LINES FOR TASK #4 HERE // Get the result set from a query that // selects all information for the gameNumber // the user entered

if(result.next()) { homeTeam = result.getString("HomeTeam"); visitingTeam = result.getString("Visitor" + "Team");

System.out.print("Enter the score " + "for the " + homeTeam); score1 = keyboard.nextInt();

System.out.print("Enter the score " + "for the " + visitingTeam); score2 = keyboard.nextInt(); keyboard.nextLine();

// ADD LINES FOR TASK #4 HERE // Execute an update to the Games table to // store the score for each team of that // game number

if(score1 < score2) { // ADD LINES FOR TASK #4 HERE // Retrieve the number from the // appropriate column // (wins, losses, or ties) for the // home team, increment, and update // that team's record. // Do the same for the visiting team } else if(score2 < score1) { // ADD LINES FOR TASK #4 HERE // Retrieve the number from the // appropriate column // (wins, losses, or ties) for the // home team, increment, and update // that team's record. // Do the same for the visiting team } else { // ADD LINES FOR TASK #4 HERE // Retrieve the number from the // appropriate column // (wins, losses, or ties) for the // home team, increment, and update // that team's record. // Do the same for the visiting team } }

System.out.print("Do you want to enter " + "another game: "); ans = keyboard.nextLine().charAt(0);

} while(ans == 'Y'|| ans == 'y'); }

catch(Exception ex) { System.out.println("ERROR: " + ex.getMessage()); } } }