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Spring Data: Bridging Multiple Databases

Custom Spring Data Repositories

Explore how to design and implement custom Spring Data repositories with abstract methods and EntityManager integration. Learn to extend default repository capabilities to perform tailored database queries, enhancing your control over data access in your Spring applications.

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At times, the default methods available through Spring Data repositories aren’t enough for our specific needs. In this case, we can choose to create custom Spring Data repositories with abstract methods.

The CustomCustomerRepository interface

First, let’s create a custom repository interface CustomCustomerRepository for the Customer entity with the findCustomerCustom abstract method.

Java
package com.smartdiscover.repository;
import com.smartdiscover.entity.Customer;
import org.springframework.stereotype.Repository;
@Repository
public interface CustomCustomerRepository {
    Customer findCustomerCustom(String firstName, String lastName);
}

Explanation:

  • Lines 6–7: We
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