1/17/2024 0 Comments Hibernate annotations not required![]() ![]() SessionFactory provides an instance of Session. Additionally, It has factory methods to return Query, Criteria, and Transaction objects. Session also has methods for storing, retrieving, modifying or deleting data from database using methods like persist(), load(), get(), update(), delete(), etc. What are some of the important interfaces of Hibernate framework?Ī session is an object that maintains the connection between Java object application and database. Special Features: Hibernate supports OOPs features like inheritance, associations and also supports collections.In the case of JDBC, it throws a checked exception called SQLException thereby mandating the developer to write try-catch blocks to handle this exception at compile time. This along with the built-in transaction management system helps developers to avoid writing multiple try-catch blocks to handle exceptions. Exception Handling: Hibernate wraps the JDBC exceptions and throws unchecked exceptions like JDBCException or HibernateException.Whereas, Hibernate implicity provides this feature. It is upon the developer to write transaction management code using commit and rollback methods. Transaction Management: JDBC doesn't support implicit transaction management.A developer has to know the database-specific codes. This helps in reducing the burden on developers for writing database independent queries. HQL (Hibernate Query Language): Hibernate provides HQL which is closer to Java and is object-oriented in nature.Clean Readable Code: Using hibernate, helps in eliminating a lot of JDBC API-based boiler-plate codes, thereby making the code look cleaner and readable.The advantages of Hibernate over JDBC are listed below: What are the advantages of Hibernate over JDBC? Can you tell something about Named SQL Query Can you tell something about Table Per Class Strategy. What are the concurrency strategies available in hibernate? How to solve N+1 SELECT problem in Hibernate? ![]() Can you tell something about the N+1 SELECT problem in Hibernate? What are the states of a persistent entity? What happens when the no-args constructor is absent in the Entity bean? Hibernate Interview Questions For Experienced Does Hibernate support Native SQL Queries? Can you tell the difference between setMaxResults() and setFetchSize() of Query? Collection mapping can be done using One-to-One and Many-to-One Associations. When is merge() method of the hibernate session useful? What does session.lock() method in hibernate do? Can you tell something about one to many associations and how can we use them in Hibernate? Differentiate between get() and load() in Hibernate session Differentiate between save() and saveOrUpdate() methods in hibernate session. Can you tell the difference between getCurrentSession and openSession methods? What are the most commonly used annotations available to support hibernate mapping? Is hibernate prone to SQL injection attack? Can you explain the concept behind Hibernate Inheritance Mapping? How do you create an immutable class in hibernate? What can you tell about Hibernate Configuration File? What is the difference between first level cache and second level cache? Can you explain what is lazy loading in hibernate? What do you think about the statement - “session being a thread-safe object”? What are some of the important interfaces of Hibernate framework? Might give more problems than security.Hibernate Interview Questions For Freshers I have shortly considered to combine my own validation with the Hibernate validator - but this will introduce conflicts or duplicate checks. And if there are fields which need special chars (file upload, html or whatever) then lets override this with Size/Pattern/SafeHtml constraints. Why not have an internal check to validate this. Probably more than 90% of supplied strings in an application are shorter than 20 chars and do not contain special chars. The validations should be part of the “environment”. And as all of them have to be validated, we should not need to rely on the fact that every developer forces these checks. enforce security: None of the provided strings must be unchecked, to avoid attacks of whatever kind.All (at least many) of the tests to ensure that data is there and presented in a way the business case expects them are addressed by Hibernate Validator. offload from business logic, as you call it in the spec, “metadata” to ensure the business case is working.I think there are two reasons to validate input data: If you don’t have constraints there’s nothing to validate.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |