2 APA reference required Explain what named queries are and

2. (APA reference required) Explain what named queries are and how they are used.

Solution

named query is a statically defined query with a predefined unchangeable query string. These queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the use of query parameters rather than embedding literals dynamically into the query string and results in more efficient queries.

example:

@NamedQuery: this annotation defines a query whose name is \"State.findAll\" that retrieves all the State objects in the database: