What do you need to know about hibernate Criteria Queries?

What do you need to know about hibernate Criteria Queries?

Hibernate – Criteria Queries. Hibernate provides alternate ways of manipulating objects and in turn data available in RDBMS tables. One of the methods is Criteria API, which allows you to build up a criteria query object programmatically where you can apply filtration rules and logical conditions. The Hibernate Session interface provides…

How to add restrictions to a hibernate criteria object?

You may add these restrictions to a Criteria object with the add () method. The add () method takes an org.hibernate.criterion.Criterion object that represents an individual restriction. You can have more than one restriction for a criteria query.

How to add a restriction to a criteria query?

Restrictions with Criteria You can use add () method available for Criteria object to add restriction for a criteria query. Following is the example to add a restriction to return the records with salary is equal to 2000 − Criteria cr = session.createCriteria(Employee.class); cr.add(Restrictions.eq(“salary”, 2000)); List results = cr.list();

Which is the simplest example of a criteria query?

Following is the simplest example of a criteria query is one, which will simply return every object that corresponds to the Employee class. You can use add () method available for Criteria object to add restriction for a criteria query.

When to use sqlrestriction restriction in hibernate?

sqlRestriction() restriction allows you to directly specify SQL in the Criteria API. It’s useful if you need to use SQL clauses that Hibernate does not support through the Criteria API. Your application’s code does not need to know the name of the table your class uses.

Is it good to use HQL in hibernate?

HQL is not preferred way for updating or deleting values because then we need to take care of any associations between tables. Hibernate Criteria API provides object oriented approach for querying the database and getting results. We can’t use Criteria in Hibernate to run update or delete queries or any DDL statements.

How to create a hibernate native SQL query?

For Hibernate Native SQL Query, we use Session.createSQLQuery (String query) to create the SQLQuery object and execute it. For example, if you want to read all the records from Employee table, we can do it through below code.