Dostęp do bazy danych v1 - bezpośrednie połączenie

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductController_v1.java

+package sklep.alternatywne_wersje_bazy_danych;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class ProductController_v1 {
+	
+	@RequestMapping(path="/alt1", produces="text/plain")
+	@ResponseBody
+	public String wszystkieProdukty() {
+		StringBuilder sb = new StringBuilder();
+		
+		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();
+	}
+
+}

PC30-SklepSpring/src/main/java/sklep/controller/ProductController.java

+package sklep.controller;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class ProductController {
+	
+	@RequestMapping(path="/products", produces="text/plain")
+	@ResponseBody
+	public String wszystkieProdukty() {
+		StringBuilder sb = new StringBuilder();
+		
+		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();
+	}
+
+}