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Hibernate - Interview Questions and Answers for 'Criteria' - 6 question(s) found - Order By Newest

 Q1. What is Criteria in Hibernate ?Hibernate
Ans. Criteria is a simplified API for retrieving entities by composing Criterion objects.

For example - session.createCriteria(Employee.class).add( Restrictions.like("name", "A%") ).list();

will return all employee objects having name starting with A.

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 Q2. How do we specify the criteria if it involves mapping between two entities or join between tables ?Hibernate
Ans. The following code returns the list of Employee objects having employee name starting with A and Dept Name ( Department , Employee Mapped ).

session.createCriteria(Employee.class,"emp")
.createAlias("emp.department", "dept",Criteria.INNER_JOIN)
.add( Restrictions.like("name", "A%") )
.add(Restrictions.eq("dept.name","Finance")
.list();

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 Q3. Name few Restriction Methods ?Hibernate
Ans. eq, ge, gt , between, in , isNull, isEmpty, isNotnull, ne , like, lt , or , not

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 Q4. In Hibernate, While defining Criteria, Have you ever faced any problem while adding restrictions with user defined types or Enums ?Hibernate
Ans. Yes, with Enum as was getting an exception while doing equality check for enum field.

got it fixed by adding @Enumerated(EnumType.STRING) to the field in entity.

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 Q5. What is your choice while writing queries within Hibernate - criteria or HQL ?Hibernate
Ans. I prefer using Criteria for Dynamic queries and HQL for static queries.

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 Q6. How to specify the or/and combination restrictions within Criteria in Hibernate ? Hibernate
Ans. session.createCriteria(Employee.class).add( Restrictions.or(Restrictions.like("name", "A%"),Restrictions.like("name", "B%"))).list();

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