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Backend/utils/queries/avatar.py

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+class AvatarQueries:
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS avatars (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER UNIQUE NOT NULL,
+            avatar_type TEXT NOT NULL,
+            top_clothe_type TEXT,
+            bottom_clothe_type TEXT,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    SELECT_USER_AVATAR = """
+        SELECT * FROM avatars WHERE user_id = ?
+    """
+
+    INSERT_AVATAR = """
+        INSERT INTO avatars (user_id, avatar_type, top_clothe_type, bottom_clothe_type)
+        VALUES (?, ?, ?, ?)
+    """
+
+    UPDATE_AVATAR = """
+        UPDATE avatars SET {fields} WHERE user_id = ?
+    """

Backend/utils/queries/diary.py

@@ -0,0 +1,71 @@
+class DiaryQueries:
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS diaries (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            title TEXT NOT NULL,
+            content TEXT NOT NULL,
+            images TEXT,
+            category TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            is_submitted BOOLEAN DEFAULT FALSE,
+            email_sent BOOLEAN DEFAULT FALSE,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_DIARY = """
+        INSERT INTO diaries (user_id, title, content, images, category, created_at, is_submitted, email_sent)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+    """
+
+    SELECT_USER_DIARIES = """
+        SELECT * FROM diaries 
+        WHERE user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_USER_DIARIES_BY_CATEGORY = """
+        SELECT * FROM diaries 
+        WHERE user_id = ? AND category = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_BY_ID = """
+        SELECT * FROM diaries WHERE id = ?
+    """
+
+    SELECT_BY_ID_WITH_USER_ID = """
+        SELECT * FROM diaries WHERE id = ? AND user_id = ? 
+    """
+
+    SELECT_LATEST_USER_DIARY = """
+        SELECT * FROM diaries WHERE user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_IMAGES_BY_ID = """
+        SELECT images FROM diaries WHERE id = ?
+    """
+
+    UPDATE_DIARY = """
+        UPDATE diaries SET {fields} WHERE id = ? AND user_id = ?
+    """
+
+    DELETE_DIARY = """
+        DELETE FROM diaries WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_SUBMISSION_STATUS = """
+        UPDATE diaries SET is_submitted = ? WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_EMAIL_SENT = """
+        UPDATE diaries SET email_sent = ? WHERE id = ?
+    """
+
+    UPDATE_DIARY_IMAGE_BY_ID = """
+        UPDATE diaries SET images = ? WHERE id = ?
+    """

Backend/utils/queries/friendship.py

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+class FriendshipQueries:
+    """친구 관계 관련 쿼리"""
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS friendships (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            friend_id INTEGER NOT NULL,
+            status TEXT NOT NULL DEFAULT 'pending',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
+            FOREIGN KEY (friend_id) REFERENCES users (id) ON DELETE CASCADE,
+            UNIQUE(user_id, friend_id)
+        )
+    """
+
+    SELECT_USER_BY_USERNAME = """
+        SELECT id FROM users WHERE username = ?
+    """
+
+    SELECT_EXISTING_FRIENDSHIP = """
+        SELECT * FROM friendships 
+        WHERE (user_id = ? AND friend_id = ?) OR (user_id = ? AND friend_id = ?)
+    """
+
+    INSERT_FRIENDSHIP = """
+        INSERT INTO friendships (user_id, friend_id, status, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_FRIENDSHIP_BY_IDS = """
+        SELECT * FROM friendships WHERE user_id = ? AND friend_id = ?
+    """
+
+    SELECT_FRIENDSHIP_FOR_ACCEPT = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON f.user_id = u.id
+        WHERE f.id = ? AND f.friend_id = ? AND f.status = ?
+    """
+
+    UPDATE_FRIENDSHIP_STATUS = """
+        UPDATE friendships SET status = ? WHERE id = ?
+    """
+
+    SELECT_USER_FRIENDSHIPS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON (
+            CASE 
+                WHEN f.user_id = ? THEN f.friend_id = u.id
+                ELSE f.user_id = u.id
+            END
+        )
+        WHERE (f.user_id = ? OR f.friend_id = ?) AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    SELECT_USER_FRIENDSHIPS_BY_STATUS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON (
+            CASE 
+                WHEN f.user_id = ? THEN f.friend_id = u.id
+                ELSE f.user_id = u.id
+            END
+        )
+        WHERE (f.user_id = ? OR f.friend_id = ?) AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    DELETE_FRIENDSHIP = """
+        DELETE FROM friendships 
+        WHERE id = ? AND (user_id = ? OR friend_id = ?)
+    """
+
+    SELECT_PENDING_REQUESTS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON f.user_id = u.id
+        WHERE f.friend_id = ? AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    CHECK_FRIENDSHIP_STATUS = """
+        SELECT * FROM friendships 
+        WHERE ((user_id = ? AND friend_id = ?) OR (user_id = ? AND friend_id = ?))
+        AND status = 'accepted'
+    """

Backend/utils/queries/guestbook.py

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+class GuestBookQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS guest_books (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            target_user_id INTEGER NOT NULL,
+            user_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_GUEST_BOOK = """
+        INSERT INTO guest_books (target_user_id, user_id, content, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_TARGET_USER_GUEST_BOOKS = """
+        SELECT * FROM guest_books 
+        WHERE target_user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_GUEST_BOOK_BY_ID = """
+        SELECT * FROM guest_books WHERE id = ?
+    """
+
+    SELECT_GUEST_BOOK_BY_USER_ID = """
+        SELECT * FROM guest_books WHERE user_id = ? ORDER BY created_at DESC LIMIT 1
+    """
+
+    UPDATE_GUEST_BOOK_BY_ID = """
+        UPDATE guest_books SET content = ?, updated_at=CURRENT_TIMESTAMP WHERE id = ?
+    """
+
+    DELETE_GUEST_BOOK = """
+        DELETE FROM guest_books WHERE id = ? AND user_id = ?
+    """

Backend/utils/queries/room.py

@@ -0,0 +1,81 @@
+class RoomQueries:
+    """마이 룸 관련 쿼리"""
+
+    CREATE_TABLE = """
+    CREATE TABLE IF NOT EXISTS rooms (
+        id INTEGER PRIMARY KEY,
+        user_id INTEGER UNIQUE,
+        room_name TEXT,
+        room_type TEXT
+    )
+    """
+    CREATE_TABLE_ROOM_FURNITURE = """
+        CREATE TABLE IF NOT EXISTS room_furnitures (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            room_id INTEGER NOT NULL,
+            furniture_name TEXT NOT NULL,
+            x INTEGER NOT NULL,
+            y INTEGER NOT NULL,
+            FOREIGN KEY (room_id) REFERENCES rooms(id) ON DELETE CASCADE
+        )
+    """
+
+    CREATE_TABLE_USER_FURNITURE = """
+        CREATE TABLE IF NOT EXISTS user_furnitures (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            furniture_name TEXT NOT NULL
+        )
+    """
+
+    INSERT_USER_FURNITURE = """
+        INSERT INTO user_furnitures (user_id, furniture_name) VALUES (?, ?)
+    """
+
+    INSERT_ROOM = """
+        INSERT INTO rooms (user_id, room_name, room_type) VALUES (?, ?, ?)
+    """
+
+    INSERT_ROOM_FURNITURE = """
+        INSERT INTO room_furnitures (room_id, furniture_name, x, y) VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_ROOM_ID_BY_USER_ID = """
+        SELECT id FROM rooms WHERE user_id = ?
+    """
+
+    SELECT_ROOM_BY_ID = """
+        SELECT * FROM rooms WHERE id = ?
+    """
+
+    SELECT_FURNITURE = """
+        SELECT * FROM furnitures
+    """
+
+    SELECT_ROOM_FURNITURE = """
+        SELECT id, furniture_name, x, y FROM room_furnitures WHERE room_id = ?
+    """
+
+    SELECT_FURNITURE_ID_BY_X_Y = """
+        SELECT id FROM room_furnitures WHERE room_id = ? AND x = ? AND y = ?
+    """
+
+    SELECT_USER_FURNITURE = """
+        SELECT * FROM user_furnitures WHERE user_id = ?
+    """
+
+    UPDATE_ROOM_NAME = """
+        UPDATE rooms SET room_name = ? WHERE id = ?
+    """
+
+    UPDATE_ROOM_TYPE = """
+        UPDATE rooms SET room_type = ? WHERE id = ?
+    """
+
+    DELETE_FURNITURE = """
+        DELETE FROM room_furnitures WHERE room_id = ? AND x = ? AND y = ?
+    """
+
+    SELECT_ROOM_BY_USER_ID = """
+        SELECT * FROM rooms WHERE user_id = ?
+    """

Backend/utils/queries/user.py

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+class UserQueries:
+    """사용자 관련 쿼리"""
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS users (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            username TEXT UNIQUE NOT NULL,
+            email TEXT UNIQUE NOT NULL,
+            password_hash TEXT NOT NULL,
+            salt TEXT NOT NULL,
+            profile_image_path TEXT DEFAULT 'upload/profile/default.jpg',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            is_active BOOLEAN DEFAULT TRUE
+        )
+    """
+
+    INSERT_USER_WITHOUT_PROFILE = """
+        INSERT INTO users (username, email, password_hash, salt)
+        VALUES (?, ?, ?, ?)
+    """
+
+    INSERT_USER_WITH_PROFILE = """
+        INSERT INTO users (username, email, password_hash, salt, profile_image_path)
+        VALUES (?, ?, ?, ?, ?)
+    """
+
+    SELECT_BY_USERNAME = """
+        SELECT * FROM users WHERE username = ?
+    """
+
+    SELECT_BY_EMAIL = """
+        SELECT * FROM users WHERE email = ?
+    """
+
+    SELECT_BY_ID = """
+        SELECT * FROM users WHERE id = ?
+    """
+
+    SELECT_BY_USERNAME_LIKE = """
+        SELECT * FROM users WHERE username LIKE ?
+    """
+
+    DELETE_USER_BY_USERNAME = """
+        DELETE FROM users WHERE username = ?
+    """
+
+    UPDATE_PROFILE_IMAGE_PATH_BY_USERNAME = """
+        UPDATE users SET profile_image_path = ? WHERE username = ?
+    """
+
+    UPDATE_PROFILE_IMAGE_PATH_BY_ID = """
+        UPDATE users SET profile_image_path = ? WHERE id = ?
+    """
+
+    UPDATE_USER_BY_ID = """
+        UPDATE users SET {} WHERE id = ?
+    """
+
+    SELECT_USER_BY_EMAIL_AND_NOT_ID = """
+        SELECT * FROM users WHERE email = ? AND id != ?
+    """