hibernate如何創建createalias左連接？

Question

@Entity 
@Table(name = "BOOKTEST") 
@NamedQueries({@NamedQuery(name = "Booktest.findAll", query = "SELECT b FROM Booktest b"), @NamedQuery(name = "Booktest.findById", query = "SELECT b FROM Booktest b WHERE b.id = :id"), @NamedQuery(name = "Booktest.findByBookName", query = "SELECT b FROM Booktest b WHERE b.bookName = :bookName")}) 
public class Booktest implements Serializable { 
@ManyToOne 
    private Topictest topictestId; //foreign key 
    @JoinColumn(name = "USERTEST_ID", referencedColumnName = "ID") 
    @ManyToOne 
    private Usertest usertestId; //foreign key 
} 

當我執行

session.createCriteria（Booktest.class）.createAlias（ 「usertestId」， 「usertestId」，Criteria.LEFT_JOIN） .LIST（）;

的SQL_LOG仍呈現SELECT * FROM booktest，usertest而不是SELECT * FROM booktest左連接usertest做剩下多少加入？

試圖不sequitor這兩種情況下，我仍然得到以下沒有「左連接」

Hibernate: select this_.ID as ID13_2_, this_.BOOK_NAME as BOOK2_13_2_, this_.TOP 
ICTEST_ID as TOPICTEST4_13_2_, this_.USERTEST_ID as USERTEST3_13_2_, usertestid1 
_.ID as ID14_0_, usertestid1_.TOPIC_NAME as TOPIC2_14_0_, usertest4_.ID as ID15_ 
1_, usertest4_.USER_NAME as USER2_15_1_ from BOOKTEST this_, TOPICTEST usertesti 
d1_, USERTEST usertest4_ where this_.TOPICTEST_ID=usertestid1_.ID and this_.USER 
TEST_ID=usertest4_.ID(+) 

Answer 1

試試這個

session.createCriteria(BookTest.class) 
      .createAlias("topictestId", "usertestId") 
      .setFetchMode("topictestId",FetchMode.EAGER) 
      .list(); 

理論上這應該工作，如果不嘗試沒有走樣。

Answer 2

這個最後的函數在新的hibernate版本中被刪除。 https://docs.jboss.org/hibernate/orm/5.0/javadocs/org/hibernate/FetchMode.html 使用FetchMode.JOIN 謝謝