Question: What Is Hibernate Criteria?

Why criteria is used in hibernate?

In Hibernate, the Criteria API helps us build criteria query objects dynamically.

Criteria is a another technique of data retrieval apart from HQL and native SQL queries.

The primary advantage of the Criteria API is that it is intuitively designed to manipulate data without using any hard-coded SQL statements..

What is an example of a criteria?

Criteria is defined as the plural form of criterion, the standard by which something is judged or assessed. An example of criteria are the various SAT scores which evaluate a student’s potential for a successful educational experience at college. Plural form of criterion. (nonstandard, proscribed) A single criterion.

What is lazy loading in hibernate?

Lazy loading means when the select query is executed it will not hit the database. … Lazy fetching decides whether to load child objects while loading the Parent Object. You need to do this setting respective hibernate mapping file of the parent class.

What is criteria in hibernate with example?

The simplest example of a criteria query is one with no optional parameters or restrictions—the criteria query will simply return every object that corresponds to the class. Criteria crit = session. createCriteria(Product. class );

What is restriction in hibernate criteria?

The Criteria interface makes it easy to selectively fetch the data on the basis of conditions in the select query. The Restriction class in hibernate provide several methods that can be used as conditions (also known as Criterion). These conditions are added to a criteria object with the add() method.

What is the purpose of the criteria interface?

The Criteria interface provides methods to apply criteria such as retreiving all the records of table whose salary is greater than 50000 etc.

Which is better HQL or criteria?

Criteria queries are ideal for dynamic queries. It is very simple to add restrictions and ordering as well as pagination. HQL is ideal for static queries especially if you are using named queries as they underlying SQL is generated when your session factory starts.

How projection is used in hibernate criteria?

To put it simple, Hibernate Projections are used in order to query only a subset of the attributes of an entity or group of entities you’re querying with Criteria. You can also use Projections to specify distinct clauses and aggregate functions like max , sum and so on.

What is difference between HQL and Criteria in hibernate?

HQL is suitable for executing Static Queries, where as Criteria is suitable for executing Dynamic Queries. HQL is to perform both select and non-select operations on the data, Criteria is only for selecting the data, we cannot perform non-select operations using criteria.