some changes

DEV/DEV3.1/TP01/Exercise1/Database.java

@@ -28,10 +28,13 @@ public class Database {
     public Votes getVotesFromCompetitor(String country) {
         try {
             PreparedStatement query = this.connection.prepareStatement(
-                "SELECT Countries.name Votes.points" + 
-                "FROM Votes JOIN Countries ON Votes.competitor_id = Countries.id" + 
-                "WHERE Countries.name = " + country
+                "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<>();
@@ -48,7 +51,7 @@ public class Database {
 
             return new Votes(country, voteList);
         } catch(SQLException exception) {
-            System.err.println("Error while trying to prepare or execute the query.");
+            System.err.println("Error while trying to prepare or execute the query (" + exception.getMessage() + ").");
         }
 
         return null; 

DEV/DEV3.1/TP01/Exercise1/Main.java

@@ -3,7 +3,7 @@ public class Main {
     public static void main(String[] args) {
         Database database = new Database();
 
-        Votes votesForItaly = database.getVotesFromCompetitor("Italie");
+        Votes votesForItaly = database.getVotesFromCompetitor("Pays-Bas");
         
         System.out.println("Vote " + votesForItaly.getCompetitorName() + " :");
         for(Vote vote : votesForItaly.getVoters()) {
@@ -12,5 +12,7 @@ public class Main {
 
         System.out.println("-------------------");
         System.out.println("Total " + votesForItaly.getTotalPoints());
+
+        database.close();
     }
 }

DEV/DEV3.1/TP01/Exercise1/start.sh

@@ -1,2 +1,3 @@
+rm -rf *.class
 javac Main.java;
-java -cp "/export/documents/mariadb-client.jar" Main;
+java -cp ".:/export/documents/mariadb-client.jar" Main;

DEV/DEV3.1/TP01/Exercise2/Database.java

@@ -0,0 +1,68 @@
+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 VoterVotes.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/TP01/Exercise2/Main.java

@@ -0,0 +1,3 @@
+public class Main {
+    
+}

DEV/DEV3.1/TP01/Exercise2/ScoreBoardWindow.java

@@ -0,0 +1,5 @@
+import javax.swing.JFrame;
+
+public class ScoreBoardWindow extends JFrame {
+    
+}

DEV/DEV3.1/TP02/Part1/ClickSwapImageEvent.java

@@ -10,11 +10,14 @@ public class ClickSwapImageEvent extends MouseAdapter {
     }
 
     public void mouseClicked(MouseEvent event) {
+        System.out.println(this.window.manager.cursor);
         if(event.getX() > this.window.getWidth() / 2) {
             this.window.nextImage();
+            System.out.println(this.window.manager.cursor);
             return; 
         }
 
-        this.window.lastImage();
+        this.window.previousImage();
+        System.out.println(this.window.manager.cursor);
     }
 }

DEV/DEV3.1/TP02/Part1/ImageManager.java

@@ -0,0 +1,49 @@
+import java.io.File;
+
+import javax.swing.ImageIcon;
+
+public class ImageManager {
+
+    private ImageIcon[] images; 
+    public int cursor;
+    
+    public ImageManager() {
+        File resourcesDirectory = new File("../resources/");
+
+        if(resourcesDirectory.exists() && resourcesDirectory.isDirectory()) {
+            File[] files = resourcesDirectory.listFiles();
+
+            if(files != null) {
+                this.images = new ImageIcon[files.length];
+                this.cursor = 0;
+
+                for(File file : files) {
+                    this.images[this.cursor] = new ImageIcon(file.getPath());
+                    this.cursor++;
+                }
+
+                this.cursor = 0;
+            }
+        }
+    }
+
+    public ImageIcon getNextImage() {
+        if(this.cursor >= this.images.length - 1) {
+            this.cursor = 0;
+        } else {
+            this.cursor++;
+        }
+
+        return this.images[this.cursor];
+    }
+
+    public ImageIcon getPreviousImage() {
+        if(this.cursor <= 0) {
+            this.cursor = this.images.length - 1;
+        } else {
+            this.cursor--;
+        }
+
+        return this.images[this.cursor];
+    }
+}

DEV/DEV3.1/TP02/Part1/ImageWindow.java

@@ -1,86 +1,45 @@
-import java.io.File;
-
-import javax.swing.ImageIcon;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 
 public class ImageWindow extends JFrame {
 
-    private ImageIcon[] images; 
-    private int cursor;
-
+    public ImageManager manager; 
     private JLabel label; 
     
     public ImageWindow() {
+        this.manager = new ImageManager();
+
         this.setSize(1024, 1024);
         this.setLocationRelativeTo(null);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
-        File resourcesDirectory = new File("../resources/");
-
-        if(resourcesDirectory.exists() && resourcesDirectory.isDirectory()) {
-            File[] files = resourcesDirectory.listFiles();
-
-            if(files != null) {
-                this.images = new ImageIcon[files.length];
-                this.cursor = 0;
-
-                for(File file : files) {
-                    this.images[this.cursor] = new ImageIcon(file.getPath());
-                    this.cursor++;
-                }
-            }
-        }
-
         this.addMouseListener(new ClickSwapImageEvent(this));
 
-        this.cursor = 0;
-
         this.nextImage();
     }
 
     public void nextImage() {
-        if(this.images.length == 0) return;
-
         if(this.label != null) {
             this.remove(this.label);
         }
 
-        this.label = new JLabel(this.images[cursor]);
+        this.label = new JLabel(this.manager.getNextImage());
         this.label.setVerticalAlignment(JLabel.CENTER);
         this.label.setHorizontalAlignment(JLabel.CENTER);
 
-        if(this.cursor + 1 >= this.images.length) {
-            this.cursor = 0;
-        } else {
-            this.cursor++;
-        }
-
-        System.out.println(this.cursor);
-
         this.add(label);
         this.revalidate();
     }
 
-    public void lastImage() {
-        if(this.images.length == 0) return;
-
+    public void previousImage() {
         if(this.label != null) {
             this.remove(this.label);
         }
 
-        this.label = new JLabel(this.images[cursor]);
+        this.label = new JLabel(this.manager.getPreviousImage());
         this.label.setVerticalAlignment(JLabel.CENTER);
         this.label.setHorizontalAlignment(JLabel.CENTER);
 
-        if(this.cursor - 1 < 0) {
-            this.cursor = this.images.length - 1;
-        } else {
-            this.cursor--;
-        }
-
-        System.out.println(this.cursor);
-
         this.add(label);
         this.revalidate();
     }

DEV/DEV3.1/TP03/Exercise1/GridWindow.java

@@ -0,0 +1,86 @@
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+
+public class GridWindow extends JFrame {
+    
+    public GridWindow() {
+        this.setSize(200, 200);
+        this.setLocationRelativeTo(null);
+        this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+
+        this.getContentPane().setLayout(new GridBagLayout());
+
+        this.placeButtons();
+
+        this.addWindowListener(new GridWindowClosedEvent(this));
+    }
+
+    private void placeButtons() {
+        GridBagConstraints constraints = new GridBagConstraints();
+
+        JButton one = new JButton("1");
+        constraints.gridx = 0; 
+        constraints.gridy = 0;
+        constraints.gridwidth = 2; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(one, constraints);
+
+        JButton two = new JButton("2");
+        constraints.gridx = 2; 
+        constraints.gridy = 0;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 2;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(two, constraints);
+
+        JButton three = new JButton("3");
+        constraints.gridx = 1; 
+        constraints.gridy = 2;
+        constraints.gridwidth = 2; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(three, constraints);
+
+        JButton four = new JButton("4");
+        constraints.gridx = 0; 
+        constraints.gridy = 1;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 2;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(four, constraints);
+
+        JButton five = new JButton("5");
+        constraints.gridx = 1; 
+        constraints.gridy = 1;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.NONE;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 0.0;
+        constraints.weighty = 0.0;
+
+        this.getContentPane().add(five, constraints);
+    }
+}

DEV/DEV3.1/TP03/Exercise1/GridWindowClosedEvent.java

@@ -0,0 +1,19 @@
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+import javax.swing.JOptionPane;
+
+public class GridWindowClosedEvent extends WindowAdapter {
+
+    private GridWindow window;
+
+    public GridWindowClosedEvent(GridWindow window) {
+        this.window = window;
+    }
+    
+    @Override
+    public void windowClosing(WindowEvent event) {
+        int result = JOptionPane.showConfirmDialog(this.window, "Are you sure you want to close this window?", "Close current window", JOptionPane.YES_NO_OPTION);
+        if(result == JOptionPane.YES_OPTION) this.window.dispose();
+    }
+}

DEV/DEV3.1/TP03/Exercise1/Main.java

@@ -0,0 +1,7 @@
+public class Main {
+
+    public static void main(String[] args) {
+        GridWindow window = new GridWindow();
+        window.setVisible(true);
+    }
+}

DEV/DEV3.1/TP03/Exercise2/Champ.java

@@ -0,0 +1,18 @@
+public class Champ {
+    
+    private String code; 
+    private String[] modules; 
+
+    public Champ(String code, String[] modules) {
+        this.code = code; 
+        this.modules = modules;
+    }
+
+    public String getCode() {
+        return this.code;
+    }
+
+    public String[] getModules() {
+        return this.modules;
+    }
+}

DEV/DEV3.1/TP03/Exercise2/Database.java

@@ -0,0 +1,44 @@
+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 Champ[] getAllData() {
+        PreparedStatement query = this.connection.prepareStatement("SELECT id, code FROM Champ");
+        ResultSet result = query.executeQuery();
+
+        while(result.next()) {
+            query = this.connection.prepareStatement("SELECT code FROM Modules WHERE champId = " + result.getInt("id"));
+        }
+    } 
+
+    public void close() {
+        try {
+            this.connection.close();
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to close the connection.");
+        }
+    }
+}

DEV/DEV3.1/TP03/Exercise2/Main.java

@@ -0,0 +1 @@
+

DEV/DEV3.1/TP03/Exercise2/schema.sql

@@ -0,0 +1,21 @@
+CREATE TABLE Champ (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    code VARCHAR(20)
+);
+
+CREATE TABLE Module (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    champId INT REFERENCES Champ(id),
+    code VARCHAR(20)
+);
+
+INSERT INTO Champ(code) VALUES ("APL");
+INSERT INTO Champ(code) VALUES ("WIM");
+
+INSERT INTO Module(champId, code) VALUES (1, "M1102");
+INSERT INTO Module(champId, code) VALUES (1, "M1103");
+INSERT INTO Module(champId, code) VALUES (1, "M3103");
+INSERT INTO Module(champId, code) VALUES (2, "M1105");
+INSERT INTO Module(champId, code) VALUES (2, "M3104");
+INSERT INTO Module(champId, code) VALUES (2, "M4103C");
+INSERT INTO Module(champId, code) VALUES (2, "M4104C");

SCR/SCR3.1/TP02/Exercise1/answer.txt

@@ -0,0 +1,11 @@
+Explications techniques
+
+    Fonctions standards (fopen, fread, fwrite) :
+        Ces fonctions utilisent une mémoire tampon (buffer) en interne. Même si tu demandes de lire/écrire un octet à la fois, 
+        la bibliothèque C va lire ou écrire plusieurs octets (souvent 4096, la taille d’un bloc) d’un coup en interne, 
+        ce qui réduit le nombre d’appels système réels et accélère le programme.
+        Vérifie avec strace : un seul appel read ou write pour plusieurs appels fread/fwrite d’un octet !
+
+    Appels systèmes (open, read, write, close) :
+        Ici, chaque appel à read() ou write() provoque un appel système pour chaque octet. 
+        Le passage du mode utilisateur au noyau (syscall) est coûteux, donc le programme est beaucoup plus lent.