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Spring Data

Level up your Java code and explore what Spring can do for you.

All edits by  Oksana Shumei 

Edits on 24 Jan, 2022
Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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Spring Framework - Wiki

Web

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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Difference between JPA, EclipseLink & Hibernate

March 8, 2018

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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The first method will simply be select * from employees

Second method puts a where clause on ’employeeId’ field.

Third one has two where clauses one of first name and other on last name.

More complex query. Which finds list of employees by department name and who are younger than the given date and also sorts the results in descending order date of joining.

  • The first method will simply be select * from employees
  • Second method puts a where clause on ’employeeId’ field.
  • Third one has two where clauses one of first name and other on last name.
  • More complex query. Which finds list of employees by department name and who are younger than the given date and also sorts the results in descending order date of joining.
Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+417 characters)
Article

The first method will simply be select * from employees

Second method puts a where clause on ’employeeId’ field.

Third one has two where clauses one of first name and other on last name.

More complex query. Which finds list of employees by department name and who are younger than the given date and also sorts the results in descending order date of joining.

We can see the simplicity and the readability of the methods.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+382 characters)
Article

@Repository
public interface EmployeeRepository extends CrudRepository<Employee, Long> {

    List<Employee> findAll();

    Optional<Employee> findById(Long employeeId);

    List<Employee> findByFirstNameAndLastName(String firstName, String lastName);

    List<Employee> findByDepartmentNameAndAgeLessThanOrderByDateOfJoiningDesc(String departmentName, int maxAge);

}

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
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Article

The repositories in Spring Data JPA provides powerful and hassle free means of dealing with data which is called as Query Methods. The name of the methods declared in the repository interfaces are actually converted to low level SQL queries by Spring.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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Query Methods

Query Methods

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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Query Methods

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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DAO Abstraction (Repositories)

DAO Abstraction (Repositories)

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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In the background Spring uses the JPA elements like entities, and entity managers but keeps is under the cover and keeps developers free from dealing with them.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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The Spring Data JPA, defines Repository interfaces which have methods for storing and finding the entity beans from database. While the interface only defines query methods, spring at runtime, provides proxy implementations for the defined interfaces.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
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With Spring Data JPA, we don’t have to write a Data Access Layer or write any SQL statement at all. Based on JPA specification the underlying JPA implementation enables the Entity objects and their metadata mapping. It also enables the entity manager who is responsible for persisting and retrieving entities from database.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+30 characters)
Article

DAO Abstraction (Repositories)

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+16/-16 characters)
Article

Spring Data JPA brings in a concept of JPA RepositoriesJPA Repositories a set of Interfaces which defines query methods. The Repository and Entity Bean represent the DAO layer in the application. No need to write native queries anymore. Sometimes we need to write queries or part of queries but those are JQL queries and not native database queries.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+13/-13 characters)
Article

Spring Data JPA brings in a concept of JPA Repositories a set of Interfaces which defines query methodsquery methods. The Repository and Entity Bean represent the DAO layer in the application. No need to write native queries anymore. Sometimes we need to write queries or part of queries but those are JQL queries and not native database queries.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+334 characters)
Article

Spring Data JPA brings in a concept of JPA Repositories a set of Interfaces which defines query methods. The Repository and Entity Bean represent the DAO layer in the application. No need to write native queries anymore. Sometimes we need to write queries or part of queries but those are JQL queries and not native database queries.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+238 characters)
Article

What is Spring Data JPA, if not a JPA Implementation?

Speaking precisely, Spring Data JPA is add-on for JPA. it provides a framework which works together with JPA and provides a complete abstraction over the Data Access Layer in a project.

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
Article (+27/-27 characters)
Article

Spring Data JPA is a add-on

Spring Data JPA is a add-on

Oksana Shumei
Oksana Shumei edited on 24 Jan, 2022
Edits made to:
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Article

Spring Data JPA is a add-on

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