What is a named query?

Question

I have read its definition but not able to understand fully.

Answer 1

Named query is the static query expressed in metadata.Query names are scoped to persistence unit. The following is an example of the definition of a named query in the Java Persistence query language:

@NamedQuery(
        name="findAllCustomersWithName",
        query="SELECT c FROM Customer c WHERE c.name LIKE :custName"
)

The following is an example of the use of a named query:

@PersistenceContext
public EntityManager em;
...
customers = em.createNamedQuery("findAllCustomersWithName")
        .setParameter("custName", "Smith")
        .getResultList();