feat: adds Trinitie's lesson_25 homework on Introduction to Databases (SQL)

lesson_25/db/db_app/src/main/java/com/codedifferently/lesson25/models/LibraryDataModel.java

@@ -17,6 +17,7 @@ public class LibraryDataModel {
 
   public List<MediaItemModel> mediaItems;
   public List<LibraryGuestModel> guests;
+  public List<LibraryUserModel> users;
 
   public List<MediaItem> getMediaItems() {
     List<MediaItem> results = new ArrayList<>();
@@ -52,6 +53,10 @@ public List<LibraryGuest> getGuests() {
     return results;
   }
 
+  public List<LibraryUserModel> getUsers() {
+    return this.users != null ? this.users : new ArrayList<>();
+  }
+
   public Map<String, List<CheckoutModel>> getCheckoutsByEmail() {
     Map<String, List<CheckoutModel>> results = new HashMap<>();
     for (LibraryGuestModel guest : this.guests) {

lesson_25/db/db_app/src/main/java/com/codedifferently/lesson25/models/LibraryUserModel.java

@@ -0,0 +1,17 @@
+package com.codedifferently.lesson25.models;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import java.util.UUID;
+
+@Entity
+@Table(name = "library_users")
+public class LibraryUserModel {
+
+  @Id public UUID id;
+  public String email;
+  public String firstName;
+  public String lastName;
+  public String passwordHash;
+}

lesson_25/db/db_app/src/main/java/com/codedifferently/lesson25/repository/LibraryUserRepository.java

@@ -0,0 +1,14 @@
+package com.codedifferently.lesson25.repository;
+
+import com.codedifferently.lesson25.models.LibraryUserModel;
+import java.util.List;
+import java.util.UUID;
+import org.springframework.data.repository.CrudRepository;
+
+public interface LibraryUserRepository extends CrudRepository<LibraryUserModel, UUID> {
+
+  @Override
+  List<LibraryUserModel> findAll();
+
+  LibraryUserModel findByEmail(String email);
+}

lesson_25/db/db_app/src/main/resources/queries/trinitiejackson.sql

@@ -0,0 +1,24 @@
+SELECT type, COUNT(*) AS count
+FROM media_items
+GROUP BY type;
+
+SELECT SUM(pages) 
+FROM media_items
+JOIN checked_out_items ON media_items.id = checked_out_items.item_id;
+
+SELECT guests.name, guests.email, media_items.title
+FROM guests
+LEFT JOIN checked_out_items ON guests.email = checked_out_items.email
+LEFT JOIN media_items ON checked_out_items.item_id = media_items.id;
+
+CREATE TABLE library_users (
+    id TEXT PRIMARY KEY,
+    email TEXT UNIQUE NOT NULL,
+    first_name TEXT NOT NULL,
+    last_name TEXT NOT NULL,
+    password_hash TEXT NOT NULL
+);
+
+INSERT INTO library_users (id, email, first_name, last_name, password_hash)
+VALUES ('550e8400-e29b-41d4-a716-446655440000', '[email protected]', 'Trinitie', 'Jackson', '$2y$10$fBjbX04w/CPZ4YZNJpLBR.hyuz1YXbyIFj92udVrckYEXjPzhoDHq'),
+       ('550e8400-e29b-41d4-a716-446655440001', '[email protected]', 'John', 'Doe', '$2y$10$QnMskk1wZ.T5148M9aALAuAeCHPRW72e3aN41Ysms4gOu1/YSjJn.');