Podcast
Questions and Answers
What does JPA stand for?
What does JPA stand for?
Java Persistence API
The primary purpose of JPA is to provide a framework for _____ in Java.
The primary purpose of JPA is to provide a framework for _____ in Java.
persistence
What is the role of Maven in Java projects?
What is the role of Maven in Java projects?
Dependency management and build automation
The Spring Data generated DAO is customizable.
The Spring Data generated DAO is customizable.
Signup and view all the answers
Which of the following are supported database types in Spring with JPA? (Select all that apply)
Which of the following are supported database types in Spring with JPA? (Select all that apply)
Signup and view all the answers
What does the @Transactional annotation do in Spring?
What does the @Transactional annotation do in Spring?
Signup and view all the answers
To configure transactions with XML, you would typically use the _____ schema.
To configure transactions with XML, you would typically use the _____ schema.
Signup and view all the answers
What is the primary benefit of using Hibernate with Spring? (Select one)
What is the primary benefit of using Hibernate with Spring? (Select one)
Signup and view all the answers
What are the two types of configuration you can use with Hibernate?
What are the two types of configuration you can use with Hibernate?
Signup and view all the answers
Spring Data JPA supports custom defined queries.
Spring Data JPA supports custom defined queries.
Signup and view all the answers
Which of the following is a clause you can use with JPQL queries?
Which of the following is a clause you can use with JPQL queries?
Signup and view all the answers
Study Notes
JPA with Spring
- Spring Data simplifies JPA's configuration and usage
-
Maven dependency: Use
spring-boot-starter-data-jpa - Spring Boot: Automatically configures JPA for you
-
Manual Configuration (XML): Configure Hibernate details in
persistence.xml -
Manual Configuration (Java): Use
@PersistenceContextfor entity manager injection - XML-less: Use annotations for configuration
Bootstrapping Hibernate 5 with Spring
- Spring Boot: Automatically configures Hibernate 5
-
Maven Dependencies:
-
org.hibernate:hibernate-core -
org.hibernate:hibernate-entitymanager -
org.springframework:spring-orm -
org.springframework:spring-tx
-
-
Java Configuration:
- Override default settings using
LocalSessionFactoryBean - Inject
SessionFactoryfor DAO access
- Override default settings using
-
XML Configuration:
- Define Hibernate settings in
hibernate.cfg.xml - Use
SessionFactoryfor DAO access
- Define Hibernate settings in
The DAO with Spring and Hibernate
- Simplified development: Use JPA and Hibernate for data persistence
-
No Spring Templates:
- Use
EntityManagerfor entity management - Use
@PersistenceContextto injectEntityManager - Use
@Transactionalfor transaction management
- Use
-
Exception Translation: Use the
@Transactionalannotation for automatic exception translation - DAO: The Data Access Object pattern simplifies the interaction with the persistence layer
Simplify the DAO with Spring and Java Generics
- Generic DAOs: Reduce code repetition within the DAO implementation
- Abstract DAOs: Provide common functionality across DAOs
- Generic JPA DAO: Implement generic behavior for various entities
- Generic Hibernate DAO: Implement generic actions for various entities
- Injecting DAOs: Use constructor injection for better control and clarity
Transactions with Spring and JPA
- Transaction Management: Ensure data integrity and concurrency control
-
XML Configuration: Use the
txnamespace to configure transactions - Java Configuration: Use annotations to define transactional methods
-
Transaction Annotations:
-
@Transactionalfor transactional methods -
readOnlyattribute for read-only transactions -
isolationattribute for different isolation levels
-
-
Potential Pitfalls:
- Proxies for transaction management
- Isolation levels for concurrency control
- Transaction logging for troubleshooting
Introduction to Spring Data JPA
- Simplified Data Access: Spring Data provides a unified and user-friendly JPA interface
- Spring Data DAO: Simplified and automated data access layer
- Custom Queries: Define custom queries using various methods
- Automatically Generated Queries: Derive query logic based on method names
- Manual Custom Queries: Write custom queries using @Query annotations
-
Transaction Configuration:
-
@Transactionalfor transactional methods
-
- Exception Translation: Handles exceptions automatically
-
Spring Data Configuration:
- Use
@EnableJpaRepositoriesfor repository scanning
- Use
Spring Data JPA @Query
- Custom Queries: Enhance Spring Data JPA with more control over queries
-
Select Queries:
- JPQL: Use JPQL syntax to define queries
- Native: Use native SQL queries
-
Order in Query:
- JPQL: Define order in the query string
- Native: Define order in the native SQL query
- Spring Data JPA: Use
Pageablefor pagination
- Pagination: Retrieve data in smaller chunks for better performance
-
Indexed Query Parameters:
- JPQL: Use positional parameters in queries
- Native: Use positional parameters in queries
-
Named Parameters:
- JPQL: Use named parameters for better readability
- Native: Use named parameters for better readability
- Collection Parameter: Pass collections as query parameters
- Update Queries: Use @Modifying annotation for update queries
- Dynamic Queries: Build queries at runtime depending on the input
- Custom Repositories: Implement custom interfaces for specific data access operations
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
