When can we use the method query uniqueResult?

When can we use the method query uniqueResult?

When we are using hibernate Query to fetch a single instance, Query. uniqueResult() is being used except special scenarios. To use Query. uniqueResult(), we must make sure that query will return a single object.

What is query interface in Hibernate?

Query Interface It is an object oriented representation of Hibernate Query. The object of Query can be obtained by calling the createQuery() method Session interface. The query interface provides many methods.

What is setParameter query?

The Query. setParameter(integer position, Object value) method is used to set the parameter values.

How many SessionFactory are created per application in Hibernate session?

So in short it is – SessionFactory objects are one per application and Session objects are one per client.

How are named parameters specified in an HQL query?

It’s use question mark (?) to define a named parameter, and you have to set your parameter according to the position sequence. See example… String hql = “from Stock s where s.

What is SessionFactory in Hibernate with example?

Most importantly, the SessionFactory in Hibernate is responsible for the creation of Session objects. The Hibernate Session provides methods such as save, delete and update, all of which are used to perform CRUD-based operations on the database to which the SessionFactory connects.

What is create named query?

The createNamedQuery method is used to create static queries, or queries that are defined in metadata by using the javax.persistence.NamedQuery annotation. The name element of @NamedQuery specifies the name of the query that will be used with the createNamedQuery method.

What is TypedQuery in JPA?

But, JPA provides a special Query sub-type known as a TypedQuery. This is always preferred if we know our Query result type beforehand. Additionally, it makes our code much more reliable and easier to test. This way, we get stronger typing for free, avoiding possible casting exceptions down the road.

Why SessionFactory is used in Hibernate?

SessionFactory is an Interface which is present in org. hibernate package and it is used to create Session Object. It is immutable and thread-safe in nature. buildSessionFactory() method gathers the meta-data which is in the cfg Object.