some changes

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.");
+        }
+    }
+}