shopping cart done

Signed-off-by: Johannes Theiner <j.theiner@live.de>

src/main/java/de/hsel/itech/db/ShoppingCartDB.java

@@ -52,6 +52,26 @@ public class ShoppingCartDB {
         return list;
     }
 
+    public int updateItem(@NotNull ShoppingCartItem item) {
+        Connection connection = database.getConnection();
+        assert  connection != null;
+        int alterCount = 0;
+
+        try {
+            PreparedStatement statement = connection.prepareStatement("UPDATE cart_books SET count = ? WHERE user = ? AND book = ?");
+            statement.setInt(1, item.getCount());
+            statement.setLong(2, item.getUser().getId());
+            statement.setLong(3, item.getArticle().getId());
+
+            alterCount += statement.executeUpdate();
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return alterCount;
+    }
+
     /**
      * insert new item to users shopping cart.
      *

src/main/java/de/hsel/itech/jsf/CartBean.java

@@ -3,11 +3,13 @@ package de.hsel.itech.jsf;
 import de.hsel.itech.db.Database;
 import de.hsel.itech.db.pojo.*;
 import lombok.Setter;
+import org.jetbrains.annotations.NotNull;
 
 import javax.faces.annotation.ManagedProperty;
 import javax.faces.bean.ManagedBean;
 import javax.faces.bean.SessionScoped;
 import javax.faces.context.FacesContext;
+import javax.faces.event.PhaseId;
 import javax.faces.event.ValueChangeEvent;
 import java.sql.Date;
 import java.util.ArrayList;
@@ -72,10 +74,15 @@ public class CartBean {
         return items;
     }
 
-    public void change(ValueChangeEvent event) {
-        System.out.println("änderung");
+    public void change(@NotNull ValueChangeEvent event) {
+        if (event.getPhaseId() != PhaseId.INVOKE_APPLICATION) {
+            event.setPhaseId(PhaseId.INVOKE_APPLICATION);
+            event.queue();
+            return;
+        }
+
         for(ShoppingCartItem item : getItems()) {
-            System.out.println(item.getCount());
+            Database.getInstance().shoppingCart().updateItem(item);
         }
     }