Feat: implements sql query and creates a new table for the library_users

lesson_28/db/db_app/src/main/java/com/codedifferently/lesson28/models/LibraryDataModel.java

@@ -16,6 +16,7 @@
 public class LibraryDataModel {
   public List<MediaItemModel> mediaItems;
   public List<LibraryGuestModel> guests;
+  public List<LibraryUsersModel> users;
 
   public List<MediaItem> getMediaItems() {
     List<MediaItem> results = new ArrayList<>();
@@ -58,4 +59,9 @@ public Map<String, List<CheckoutModel>> getCheckoutsByEmail() {
     }
     return results;
   }
+
+  public List<LibraryUsersModel> getUsers() {
+
+    return users;
+  }
 }

lesson_28/db/db_app/src/main/java/com/codedifferently/lesson28/models/LibraryUsersModel.java

@@ -0,0 +1,17 @@
+package com.codedifferently.lesson28.models;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import java.util.UUID;
+
+@Entity
+@Table(name = "library_users")
+public class LibraryUsersModel {
+  @Id public UUID id;
+
+  public String email;
+  public String firstName;
+  public String lastName;
+  public String passwordString;
+}

lesson_28/db/db_app/src/main/java/com/codedifferently/lesson28/repository/LibraryUsersRepository.java

@@ -0,0 +1,11 @@
+package com.codedifferently.lesson28.repository;
+
+import com.codedifferently.lesson28.models.LibraryUsersModel;
+import java.util.List;
+import java.util.UUID;
+import org.springframework.data.repository.CrudRepository;
+
+public interface LibraryUsersRepository extends CrudRepository<LibraryUsersModel, UUID> {
+  @Override
+  List<LibraryUsersModel> findAll();
+}

lesson_28/db/db_app/src/main/resources/queries/dylanlafferty.sql

@@ -0,0 +1,28 @@
+-- 1. Count of media items by type
+SELECT 
+    type,
+    COUNT(*) AS total
+FROM
+    media_items
+GROUP BY
+    type;
+
+-- 2. Sum of total pages checked out by guests
+SELECT
+    SUM(pages) AS total_pages
+FROM 
+    media_items m 
+JOIN 
+    checked_out_items c ON m.id = c.item_id;
+
+-- 3. All 5 guests and their corresponding checked-out items
+SELECT 
+    g.*,
+    c.email, 
+    item.title
+FROM 
+    guests g
+LEFT JOIN
+    checked_out_items c ON c.email = g.email
+LEFT JOIN
+    media_items item ON item.id = c.item_id;