Hibernate Interview Questions
Hibernate Interview Questions - Learn Hibernate in simple and easy steps starting from basic to advanced concepts Sessions, Object Relational Mapping (ORM), Annotations, Query Language, Criteria Queries, Native SQL, Caching, What are the advantages of ORM over JDBC? .. What is many-to-many association?. Top 20 Hibernate Interview Questions and Answers on Arrays. In-depth How do you specify a one-to-many bidirectional relationship with Hibernate? How do. What is Many-to-Many association in Hibernate? What is Explain Hibernate configuration file and Hibernate mapping file? What are.
Wraps a JDBC connection. Holds a mandatory first-level cache of persistent objects, used when navigating the object graph or looking up objects by identifier.
Persistent objects and collections Short-lived, single threaded objects containing persistent state and business function. As soon as the Session is closed, they will be detached and free to use in any application layer e. Transient and detached objects and collections Instances of persistent classes that are not currently associated with a Session. They may have been instantiated by the application and not yet persisted or they may have been instantiated by a closed Session.
Hibernate - Interview Questions
Transaction Optional A single-threaded, short-lived object used by the application to specify atomic units of work. A Session might span several Transactions in some cases. However, transaction demarcation, either using the underlying API or Transaction, is never optional! For example, in any company an employee can register multiple bank accounts but one bank account will be associated with one and only one employee.
In this hibernate one to many mapping annotation example, we will learn to make such mapping in database using hibernate. Table of Contents When to use one to many mapping Hibernate one to many mapping solutions 1. Hibernate one to many mapping with foreign key association 2. Hibernate one to many mapping with join table When to use one to many mapping Use one to mapping to create N relationship between entities or objects.
For example, we have to write two entities i.
Hibernate one to many mapping annotation example
EmployeeEntity and AccountEntity such that multiple accounts can be associated with a single employee, but one single account can not be shared between two or more employees. Hibernate one to many mapping solutions This problem can be solved in two different ways. One is to have a foreign key column in account table i.
The expression can be defined using the formula attribute of the element. What is component mapping in Hibernate?
A component is an object saved as a value, not as a reference A component can be saved directly without needing to declare interfaces or identifier properties Required to define an empty constructor Shared references not supported What is the difference between sorted and ordered collection in hibernate? The sorting occurs in the memory of JVM which running Hibernate, after the data being read from database using java comparator. Order collection is sorting a collection by specifying the order-by clause for sorting this collection when retrieval.
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If your collection is not large, it will be more efficient way to sort it. If your collection is very large, it will be more efficient way to sort it.
What is the advantage of Hibernate over jdbc? Hibernate is flexible and powerful ORM solution to map Java classes to database tables.
Hibernate interview questions by Satya Das : Many To Many Relation In Hibernate ?
Hibernate itself takes care of this mapping using XML files so developer does not need to write code for this. With JDBC, the automatic mapping of Java objects with database tables and vice versa conversion is to be taken care of by the developer manually with lines of code.
Hibernate provides transparent persistence and developer does not need to write code explicitly to map database tables tuples to application objects during interaction with RDBMS. Developer has to find out the efficient way to access database, i. Hibernate provides a powerful query language Hibernate Query Language independent from type of database that is expressed in a familiar SQL like syntax and includes full support for polymorphic queries.