Odczyt produktów za pomocą JDBC

PC27-SklepSpring/src/main/java/sklep/alternatywne_dostepy_do_bazy/ProductController_v1.java

+package sklep.alternatywne_dostepy_do_bazy;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.sql.*;
+
+@Controller
+@RequestMapping("/alt1")
+public class ProductController_v1 {
+
+    @GetMapping(produces = "text/plain;charset=UTF-8")
+    @ResponseBody
+    public String readAll() {
+        StringBuilder sb = new StringBuilder("Lista produktów:\n");
+        try(Connection c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/sklep", "kurs", "abc123");
+            Statement stmt = c.createStatement();
+            ResultSet rs = stmt.executeQuery("SELECT * FROM products ORDER BY product_id")) {
+
+            while(rs.next()) {
+                sb.append("* produkt ")
+                        .append(rs.getString("product_name"))
+                        .append(" za cenę ")
+                        .append(rs.getBigDecimal("price"))
+                        .append('\n');
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+            sb.append("Błąd: " + e);
+        }
+        return sb.toString();
+    }
+}

PC27-SklepSpring/src/main/java/sklep/controller/ProductController.java

+package sklep.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.sql.*;
+
+@Controller
+@RequestMapping("/products")
+public class ProductController {
+
+    @GetMapping(produces = "text/plain;charset=UTF-8")
+    @ResponseBody
+    public String readAll() {
+        StringBuilder sb = new StringBuilder("Lista produktów:\n");
+        try(Connection c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/sklep", "kurs", "abc123");
+            Statement stmt = c.createStatement();
+            ResultSet rs = stmt.executeQuery("SELECT * FROM products ORDER BY product_id")) {
+
+            while(rs.next()) {
+                sb.append("* produkt ")
+                        .append(rs.getString("product_name"))
+                        .append(" za cenę ")
+                        .append(rs.getBigDecimal("price"))
+                        .append('\n');
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+            sb.append("Błąd: " + e);
+        }
+        return sb.toString();
+    }
+}