java - hibernate 如何从现有数据库 View 中检索数据？

Question

我刚接触 hibernate 。我的问题是我有一个 Oracle 数据库。我在数据库中有一个 View 。现在我想使用 hibernate 来检索该 View 中的数据。有没有可能的解决方案？

Answer 1

以下代码片段可以解决您的问题，该代码摘自教程:Mapping Hibernate Entities to Views

Database Query 

CREATE OR REPLACE VIEW cameron AS
  SELECT last_name AS surname
  FROM author
  WHERE first_name = 'Cameron';

view entity

@Entity
@NamedNativeQuery(name = "findUniqueCameronsInOrder", query = "select * from cameron order by surname", resultClass = Cameron.class)
public class Cameron implements java.io.Serializable {

    private static final long serialVersionUID = 8765016103450361311L;

    private String surname;

    @Id
    @Column(name = "SURNAME", nullable = false, length = 50)
    public String getSurname() {
        return surname;
    }

    public void setSurname(final String surname) {
        this.surname = surname;
    }
}

Hibernate mapping file.

 <mapping class="examples.hibernate.spring.query.domain.Cameron" />

finally some test !...

 @Test
    public void findTheCameronsInTheView() throws Exception {
        final List<Cameron> camerons = findUniqueCameronsInOrder();
        assertEquals(2, camerons.size());
        final Cameron judd = camerons.get(0);
        final Cameron mcKenzie = camerons.get(1);
        assertEquals("Judd", judd.getSurname());
        assertEquals("McKenzie", mcKenzie.getSurname());
    }