Revert "Add CartDAOMySQLImpl class, implement CartDAO interface"

This reverts commit 3bb7705.

src/main/java/io/hardingadonis/r7/dao/impl/mysql/CartDAOMySQLImpl.java

@@ -0,0 +1,100 @@
+package io.hardingadonis.r7.dao.impl.mysql;
+
+import io.hardingadonis.r7.dao.*;
+import io.hardingadonis.r7.model.*;
+import io.hardingadonis.r7.services.*;
+import java.sql.*;
+import java.util.*;
+
+public class CartDAOMySQLImpl implements CartDAO {
+
+    @Override
+    public List<Cart> getAll(int userID) {
+        List<Cart> list = new ArrayList<>();
+
+        try {
+            Connection conn = Singleton.dbContext.getConnection();
+
+            PreparedStatement smt = conn.prepareStatement("SELECT * FROM cart WHERE user_id = ?");
+            smt.setInt(1, userID);
+
+            ResultSet rs = smt.executeQuery();
+
+            while (rs.next()) {
+                int productID = rs.getInt("product_id");
+                int amount = rs.getInt("amount");
+
+                list.add(new Cart(userID, productID, amount));
+            }
+
+            Singleton.dbContext.closeConnection(conn);
+        } catch (SQLException ex) {
+            System.err.println(ex.getMessage());
+        }
+
+        return list;
+    }
+
+    @Override
+    public void insert(Cart obj) {
+        try {
+            Connection conn = Singleton.dbContext.getConnection();
+
+            PreparedStatement smt = conn.prepareStatement("INSERT INTO cart(user_id, product_id, amount) VALUES (?, ?, ?)");
+            smt.setInt(1, obj.getUserID());
+            smt.setInt(2, obj.getProductID());
+            smt.setInt(3, obj.getAmount());
+
+            smt.executeUpdate();
+
+            Singleton.dbContext.closeConnection(conn);
+        } catch (SQLException ex) {
+            System.err.println(ex.getMessage());
+        }
+    }
+
+    @Override
+    public void update(Cart obj) {
+        try {
+            Connection conn = Singleton.dbContext.getConnection();
+
+            PreparedStatement smt = conn.prepareStatement("UPDATE cart SET amount WHERE user_id = ? AND product_id = ?");
+            smt.setInt(1, obj.getAmount());
+            smt.setInt(2, obj.getUserID());
+            smt.setInt(3, obj.getProductID());
+
+            Singleton.dbContext.closeConnection(conn);
+        } catch (SQLException ex) {
+            System.err.println(ex.getMessage());
+        }
+    }
+
+    @Override
+    public void delete(int userID, int productID) {
+        try {
+            Connection conn = Singleton.dbContext.getConnection();
+
+            PreparedStatement smt = conn.prepareStatement("DELETE FROM cart WHERE user_id = ? AND product_id = ?");
+            smt.setInt(1, userID);
+            smt.setInt(2, productID);
+
+            Singleton.dbContext.closeConnection(conn);
+        } catch (SQLException ex) {
+            System.err.println(ex.getMessage());
+        }
+    }
+
+    @Override
+    public void deleteAll(int userID) {
+        try {
+            Connection conn = Singleton.dbContext.getConnection();
+
+            PreparedStatement smt = conn.prepareStatement("DELETE FROM cart WHERE user_id = ?");
+            smt.setInt(1, userID);
+
+            Singleton.dbContext.closeConnection(conn);
+        } catch (SQLException ex) {
+            System.err.println(ex.getMessage());
+        }
+    }
+}

src/main/java/io/hardingadonis/r7/services/Singleton.java

@@ -9,8 +9,6 @@ public class Singleton {
     public static DBContext dbContext;
 
     public static AdminDAO adminDAO;
-
-    public static CartDAO cartDAO;
 
     public static CategoryDAO categoryDAO;
 
@@ -22,8 +20,6 @@ public class Singleton {
         dbContext = new DBContextMySQLImpl();
 
         adminDAO = new AdminDAOMySQLImpl();
-
-        cartDAO = new CartDAOMySQLImpl();
 
         categoryDAO = new CategoryDAOMySQLImpl();