add Dev Part

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

@@ -0,0 +1,65 @@
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class Database {
+
+    //Countries
+    public static String COUNTRY_ID = "id";
+    public static String COUNTRY_NAME = "name";
+
+    //Votes table 
+    public static String VOTES_COMPETITOR_ID = "competitor_id";
+    public static String VOTES_VOTER_ID = "voter_id";
+    public static String VOTES_POINTS = "points";
+    
+    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 ResultSet getVotesFromCompetitor(String country) {
+        try {
+            PreparedStatement query = this.connection.prepareStatement(
+                "SELECT Countries.name, Countries.points FROM Votes INNER JOIN Countries ON Votes.competitor_id = Countries.id WHERE Votes.competitor_id = Countries.id"
+            );
+
+            ResultSet result = query.executeQuery();
+
+            try {
+                query.close();
+            } catch(SQLException exception) {
+                System.err.println("Error while trying to close the query.");
+            }
+
+            return result;
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to prepare or execute the query.");
+        }
+
+        return null; 
+    }
+
+    public void close() {
+        try {
+            this.connection.close();
+        } catch(SQLException exception) {
+            System.err.println("Error while trying to close the connection.");
+        }
+    }
+}