How to Fix Repository Pattern Errors
DodaTech
Updated 2026-06-26
1 min read
In this tutorial, you'll learn about How to Fix Repository Pattern Errors. We cover key concepts, practical examples, and best practices.
Fix repository pattern errors when data access logic scattered across business code with hardcoded queries.
Quick Fix
Wrong
def get_users():
import sqlite3
conn=sqlite3.connect('db.sqlite')
cur=conn.execute('SELECT * FROM users')
users=[{'id':r[0],'name':r[1]} for r in cur]
conn.close()
return users
def get_active_users():
import sqlite3 # duplicated!
Database connection and query logic duplicated. Switching DB requires changing every function.
Right
from abc import ABC,abstractmethod
class UserRepository(ABC):
@abstractmethod
def get_all(self): pass
@abstractmethod
def get_active(self): pass
class SQLiteUserRepository(UserRepository):
def __init__(self):
import sqlite3
self.conn=sqlite3.connect('db.sqlite')
def get_all(self):
cur=self.conn.execute('SELECT * FROM users')
return [{'id':r[0],'name':r[1]} for r in cur]
def get_active(self):
cur=self.conn.execute('SELECT * FROM users WHERE active=1')
return [{'id':r[0],'name':r[1]} for r in cur]
repo=SQLiteUserRepository(); users=repo.get_active()
Data access centralized in repository. Business code depends on interface, not DB.
Prevention
Repository mediates between domain and data mapping layers. Centralized query logic.
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