Mysql Hibernate criteriaQuery-左联接

如何使用条件查询应用左连接，我只能在internet上找到内部连接条件

        Criteria cr = this.sessionFactory.getCurrentSession().createCriteria(A.class, "a").createAlias("a.division", "division");                  
        List<A> list = cr.list();

表A数据：

    id  name        division_id
    1   first name  1
    3   sec name    2
    6   fourth name 2
    5   3rd name    NULL

表2.分区数据：

    id  type
    1   F
    2   G

内部联接：

select * from A as a inner join division where a.division_id = division.id

内部联接结果：

+----+-------------+-------------+----+------+
| id | name        | division_id | id | type |
+----+-------------+-------------+----+------+
|  1 | first name  |           1 |  1 | F    |
|  3 | sec name    |           2 |  2 | G    |
|  6 | fourth name |           2 |  2 | G    |
+----+-------------+-------------+----+------+

+----+-------------+-------------+------+------+
| id | name        | division_id | id   | type |
+----+-------------+-------------+------+------+
|  1 | first name  |           1 |    1 | F    |
|  3 | sec name    |           2 |    2 | G    |
|  6 | fourth name |           2 |    2 | G    |
|  5 | 3rd name    |        NULL | NULL | NULL |
+----+-------------+-------------+------+------+

左连接查询：

select * from A as a left join division on division.id = a.division_id;

左连接结果：

+----+-------------+-------------+----+------+
| id | name        | division_id | id | type |
+----+-------------+-------------+----+------+
|  1 | first name  |           1 |  1 | F    |
|  3 | sec name    |           2 |  2 | G    |
|  6 | fourth name |           2 |  2 | G    |
+----+-------------+-------------+----+------+

+----+-------------+-------------+------+------+
| id | name        | division_id | id   | type |
+----+-------------+-------------+------+------+
|  1 | first name  |           1 |    1 | F    |
|  3 | sec name    |           2 |    2 | G    |
|  6 | fourth name |           2 |    2 | G    |
|  5 | 3rd name    |        NULL | NULL | NULL |
+----+-------------+-------------+------+------+

---

如果您想要左加入，可以在

createAlias

中提及。默认值为

内部联接

Criteria cr = this.sessionFactory.getCurrentSession().createCriteria(A.class, "a")
      .createAlias("a.division", "division", CriteriaSpecification.LEFT_JOIN);     // Add join type            
List<A> list = cr.list();

Criteria cr=this.sessionFactory.getCurrentSession（）.createCriteria（A.class，“A”）
.createAlias（“a.division”，“division”，CriteriaSpecification.LEFT_JOIN）；//添加联接类型
List
您可以在join之后使用
where
子句，但是如果您显示了数据库结构、一些示例数据和所需的结果，您将得到更好的答案。