Queries in OOP structure

queries.py

@@ -1,4 +1,6 @@
 import sqlite3
+from dataclasses import dataclass
+from typing import Literal
 
 
 def connect_db():
@@ -7,19 +9,132 @@ def connect_db():
     return conn
 
 
-CREATE_USER_QUERY = """
-    INSERT INTO
-    users (
-        name, email, username, password
-    )
-    VALUES (
-        :name, :email, :username, :password
-    )
-    returning id
-"""
+class DbQuery:
+    def __init__(
+        self,
+        query: str,
+        type: Literal['read', 'write'],
+        returns: bool,
+        rows: Literal['single', 'multi']
+    ):
+        self.query = query
+        self.type = type
+        self.returns = returns
+        self.rows = rows
 
-CREATE_KEY_QUERY = """
+    def __str__(self) -> str:
+        return self.query
+
+    def __repr__(self) -> str:
+        return f"<query: '{self.query}, {self.type}, returns {self.returns}, {self.rows} row(s)"
+
+    def _read(self, params: dict) -> list[dict]|dict:
+        with connect_db() as conn:
+            cur = conn.execute(self.query, params)
+            data = cur.fetchall()
+            if not data:
+                return None
+            keys = [i[0] for i in cur.description]
+
+        data_dict = [dict(zip(keys, i)) for i in data]
+
+        if self.rows == 'single':
+            if len(data_dict) > 1:
+                raise ValueError('Query returned more than one rows.')
+
+            data_dict = data_dict[0]
+
+        return data_dict
+
+    def _write(self, params: dict) -> dict|bool:
+        if not isinstance(params, dict):
+            raise TypeError("Only dict type is supported for params")
+
+        with connect_db() as conn:
+            cur = conn.execute(self.query, params)
+            if self.returns:
+                data = cur.fetchone()
+                keys = keys = [i[0] for i in cur.description]
+                data_dict = dict(zip(keys, data))
+            conn.commit()
+
+        if self.returns:
+            return data_dict
+        return True
+
+    def __call__(self, params):
+        if self.type == 'read':
+            func = self._read
+        else:
+            func = self._write
+
+        return func(params)
+
+
+CREATE_USER = DbQuery(
+    query="""
+        INSERT INTO
+        users (name, email, username, password)
+        VALUES (:name, :email, :username, :password)
+        RETURNING id
+    """,
+    type='write',
+    returns=True,
+    rows='single'
+)
+
+CREATE_KEY = DbQuery(
+    query="""
         INSERT INTO
         keys (user_id, encryption_key, encryption_key_salt)
         VALUES (:user_id, :encryption_key, :encryption_key_salt)
+    """,
+    type='write',
+    returns=False,
+    rows=None
+)
+
+GET_USER_WITH_KEY = DbQuery(
     """
+        SELECT *
+        FROM users u
+        JOIN keys k on u.id = k.user_id
+        WHERE u.username = :username
+    """,
+    type='read',
+    returns=True,
+    rows='single'
+)
+
+GET_USER_BY_ID = DbQuery(
+    """
+        SELECT *
+        FROM users
+        where id = :user_id
+    """,
+    type='read',
+    returns=True,
+    rows='single'
+)
+
+CREATE_SECRET = DbQuery(
+    """
+        INSERT INTO
+        secrets(user_id, data)
+        VALUES(:user_id, :data)
+    """,
+    type='write',
+    returns=False,
+    rows=None
+)
+
+GET_SECRETS = DbQuery(
+    """
+        SELECT *
+        FROM secrets
+        WHERE user_id = :user_id
+    """,
+    type='read',
+    returns=True,
+    rows=None
+)