Comprehensive Guide to @Repository in Java with Mockito Unit Tests

Overview

The @Repository annotation in Spring Boot is a critical part of the persistence layer, allowing seamless integration with databases while promoting clean separation of concerns. This article dives into creating a robust EmployeeDao class to handle database operations using a JDBC connection and testing it effectively with Mockito. Whether you’re preparing for a coding interview or improving your database integration skills, this guide covers practical implementations with clear examples.

Comprehensive Guide to @Repository in Java with Mockito Unit Tests

Purpose

1. Understand the use of @Repository in a Spring application.
2. Implement CRUD operations with JDBC.
3. Write unit tests for DAO classes using Mockito.

Table of Contents

1. Introduction to @Repository
2. Implementing EmployeeDao

• Creating the DAO class
• Methods: findEmployeeById and saveEmployee

1. Writing Unit Tests for EmployeeDao

• Mocking database connections
• Verifying interactions with Connection, PreparedStatement, and ResultSet

1. Introduction to @Repository