all (flemme)

DEV/DEV3.1/TP_Genericity/Exercise1/Database.java

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+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+public class Database {
+    
+    private Connection connection; 
+
+    public Database() {
+        try {
+            Class.forName("org.mariadb.jdbc.Driver");
+
+            this.connection = DriverManager.getConnection(
+                "jdbc:mariadb://dwarves.iut-fbleau.fr/baudrier",
+                "baudrier",
+                "baudrier"
+            );
+        } catch(ClassNotFoundException exception) {
+            System.err.println("Class 'org.mariadb.jdbc.Driver' not found.");
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to connect to the database");
+        }
+    }
+
+    public Votes getVotesFromCompetitor(String country) {
+        try {
+            PreparedStatement query = this.connection.prepareStatement(
+                "SELECT Voters.name, Votes.points " +
+                "FROM Votes " +
+                "JOIN Countries AS Competitors ON Votes.competitor_id = Competitors.id " +
+                "JOIN Countries AS Voters ON Votes.voter_id = Voters.id " +
+                "WHERE Competitors.name = ?;"
+            );
+            query.setString(1, country);
+
+            ResultSet result = query.executeQuery();
+            ArrayList<Vote> voteList = new ArrayList<>();
+
+            while(result.next()) {
+                voteList.add(new Vote(result.getString("name"), result.getInt("points")));
+            }
+
+            try {
+                query.close();
+            } catch(SQLException exception) {
+                System.err.println("Error while trying to close the query.");
+            }
+
+            return new Votes(country, voteList);
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to prepare or execute the query (" + exception.getMessage() + ").");
+        }
+
+        return null; 
+    }
+
+    public void close() {
+        try {
+            this.connection.close();
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to close the connection.");
+        }
+    }
+}

DEV/DEV3.1/TP_Genericity/Exercise1/Main.java

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+public class Main {
+
+    public static void main(String[] args) {
+        Database database = new Database();
+
+        Votes votesForItaly = database.getVotesFromCompetitor("Pays-Bas");
+        
+        System.out.println("Vote " + votesForItaly.getCompetitorName() + " :");
+        for(Vote vote : votesForItaly.getVoters()) {
+            System.out.println(vote.getVoterName() + " " + vote.getPoints());
+        }
+
+        System.out.println("-------------------");
+        System.out.println("Total " + votesForItaly.getTotalPoints());
+
+        database.close();
+    }
+}

DEV/DEV3.1/TP_Genericity/Exercise1/Vote.java

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+public class Vote {
+    
+    private String voter; 
+    private int points; 
+
+    public Vote(String voter, int points) {
+        this.voter = voter;
+        this.points = points;
+    }
+
+    public String getVoterName() {
+        return this.voter;
+    }
+
+    public int getPoints() {
+        return this.points;
+    }
+}

DEV/DEV3.1/TP_Genericity/Exercise1/Votes.java

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+import java.util.ArrayList;
+
+public class Votes {
+    
+    private String competitor; 
+    private ArrayList<Vote> voters;
+
+    public Votes(String competitor, ArrayList<Vote> voters) {
+        this.competitor = competitor;
+        this.voters = voters; 
+    }
+
+    public String getCompetitorName() {
+        return this.competitor;
+    }
+
+    public ArrayList<Vote> getVoters() {
+        return this.voters;
+    }
+
+    public int getTotalPoints() {
+        int sum = 0;
+
+        for(Vote vote : this.voters) {
+            sum += vote.getPoints();
+        }
+
+        return sum; 
+    }
+}

DEV/DEV3.1/TP_Genericity/Exercise1/data.sql

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+CREATE TABLE Countries ( 
+    id INT PRIMARY KEY, 
+    name VARCHAR(30)
+);
+
+CREATE TABLE Votes (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    competitor_id INT REFERENCES Countries(id),
+    voter_id INT REFERENCES Countries(id),
+    points INT NOT NULL,
+    UNIQUE (competitor_id, voter_id)
+)
+
+INSERT INTO Countries VALUES (1, "France");
+INSERT INTO Countries VALUES (2, "Pays-Bas");
+INSERT INTO Countries VALUES (3, "Albanie");
+INSERT INTO Countries VALUES (4, "Italie");
+INSERT INTO Countries VALUES (5, "Russie");
+INSERT INTO Votes VALUES (2, 4, 5);
+INSERT INTO Votes VALUES (2, 5, 5);
+INSERT INTO Votes VALUES (4, 2, 16);
+INSERT INTO Votes VALUES (5, 2, 5);
+INSERT INTO Votes VALUES (5, 4, 8);

DEV/DEV3.1/TP_Genericity/Exercise1/start.sh

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+rm -rf *.class
+javac Main.java;
+java -cp ".:/export/documents/mariadb-client.jar" Main;