DEV TP01

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

@@ -3,17 +3,9 @@ import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.util.ArrayList;
 
 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; 
 
@@ -33,13 +25,20 @@ public class Database {
         }
     }
 
-    public ResultSet getVotesFromCompetitor(String country) {
+    public Votes 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"
+                "SELECT Countries.name Votes.points" + 
+                "FROM Votes JOIN Countries ON Votes.competitor_id = Countries.id" + 
+                "WHERE Countries.name = " + 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();
@@ -47,7 +46,7 @@ public class Database {
                 System.err.println("Error while trying to close the query.");
             }
 
-            return result;
+            return new Votes(country, voteList);
         } catch(SQLException exception) {
             System.err.println("Error while trying to prepare or execute the query.");
         }

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

@@ -1,26 +1,16 @@
-import java.sql.ResultSet;
-import java.sql.SQLException;
-
 public class Main {
 
     public static void main(String[] args) {
         Database database = new Database();
 
-        String country = "France";
+        Votes votesForItaly = database.getVotesFromCompetitor("Italie");
-        ResultSet result = database.getVotesFromCompetitor(country);
         
-        try {
+        System.out.println("Vote " + votesForItaly.getCompetitorName() + " :");
-            while(result.next()) {
+        for(Vote vote : votesForItaly.getVoters()) {
-                System.out.println(country + " -> " + result.getString("name") + " : " + result.getInt("points"));
+            System.out.println(vote.getVoterName() + " " + vote.getPoints());
-            }
-        } catch(SQLException exception) {
-            System.err.println("Error while read the data from the result.");
         }
 
-        try {
+        System.out.println("-------------------");
-            result.close();
+        System.out.println("Total " + votesForItaly.getTotalPoints());
-        } catch(SQLException exception) {
-            System.err.println("Error while trying to close the result.");
-        }
     }
 }

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

@@ -0,0 +1,18 @@
+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/TP01/Exercise1/Votes.java

@@ -0,0 +1,30 @@
+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; 
+    }
+}