v3

PC27-SklepSpring/src/main/java/sklep/alternatywne_dostepy_do_bazy/ProductController_v3.java

+package sklep.alternatywne_dostepy_do_bazy;
+
+import jakarta.persistence.EntityManager;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import sklep.model.Product;
+
+import java.util.List;
+
+
+@Controller
+@RequestMapping("/alt3/products")
+public class ProductController_v3 {
+    @Autowired
+    private EntityManager em;
+
+    @GetMapping
+    public String readAll(Model model) {
+        List<Product> products = em.createNamedQuery("Product.findAll", Product.class).getResultList();
+        model.addAttribute("products", products);
+        return "products";
+    }
+
+    @GetMapping("/{id}")
+    public String readOne(@PathVariable("id") Integer productId, Model model) {
+        Product product = em.find(Product.class, productId);
+        if(product != null) {
+            model.addAttribute("product", product);
+            return "product";
+        } else {
+            return "missing_product";
+        }
+    }
+}