backend: database and file upload test

backend/db.py

@@ -0,0 +1,78 @@
+import sqlite3
+
+class VNDB:
+
+    def __init__(self, db_name='vn_database.db'):
+        self.__db_name = db_name
+        connection = sqlite3.connect(self.__db_name)
+        cursor = connection.cursor()
+
+        cursor.execute('''
+        CREATE TABLE IF NOT EXISTS marks (
+            id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+            tag TEXT NOT NULL,
+            value TEXT NOT NULL
+        );
+        ''')
+
+        cursor.execute('''
+        CREATE TABLE IF NOT EXISTS authors (
+            id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+            title TEXT NOT NULL,
+            description TEXT NOT NULL,
+            thumbnail TEXT NOT NULL
+        );
+        ''')
+
+        cursor.execute('''
+        CREATE TABLE IF NOT EXISTS novels (
+            id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+            title TEXT NOT NULL,
+            author INTEGER NOT NULL
+        );
+        ''')
+
+        cursor.execute('''
+        CREATE TABLE IF NOT EXISTS posts_log (
+
+        novel INTEGER NOT NULL,
+        
+        channel INTEGER NOT NULL,
+
+        marks JSON NOT NULL,
+
+        title TEXT NOT NULL,
+
+        description TEXT NOT NULL,
+
+        author INTEGER NOT NULL,
+
+        files_on_disk JSON NOT NULL,
+        post_info JSON,
+        post_at INTEGER NOT NULL,
+        created_at INTEGER NOT NULL
+        );
+        ''')
+
+        connection.commit()
+        connection.close()
+
+    def __execute(self, sql: str, params: tuple):
+        connection = sqlite3.connect(self.__db_name)
+        connection.cursor().execute(sql, params)
+        connection.commit()
+        connection.close()
+
+    def insert_mark(self, type: str, value: str):
+        self.__execute("INSERT INTO marks (tag, value) "
+                       "VALUES (?, ?)", (type, value))
+
+    def insert_novel(self, title: str, author_id: int):
+        self.__execute("INSERT INTO novels (title, author) "
+                       "VALUES (?, ?)", (title, author_id))
+
+    def insert_author(self, title: str, desc: str, thumb: str):
+        self.__execute("INSERT INTO authors (title, description, thumbnail) "
+                       "VALUES (?, ?, ?)", (title, desc, thumb))
+
+