如何在Play Framework 1.2.5中运行JPA查询

Question

I'm trying to run JPA Query on Play Framework 1.2.5 unsuccessfully.

I tried like this:

Query query = JPA.em().createQuery("select * from Book");
List<Book> articles = query.getResultList();
render(articles);

But I get error:

The file /app/controllers/Application.java could not be compiled. Error raised is : Query cannot be resolved to a type

What I gotta do?

Answer 1

You have to import the Query class.

import javax.persistence.Query;

Doesn't your IDE flag such errors? SHouldn't you be able to fix basic compilation errors before using Play and JPA? Start by learning the basics of Java.

Also, select * from Book is not JPQL. select b from Book b is.