Hibernate HQL与IS NULL的奇怪行为

Question

我有一个HQL查询的问题.我希望将管理性别设置为"M"或没有管理性的所有PID(在Java中将值设置为null).

PID.class

@Entity
@Table(name = "PatientIdentification")
public class PID {    

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "administrativeSex", referencedColumnName = "is_id")
    private IS administrativeSex;
    ...
}

IS.class

@Entity
@Table(name = "CodedValueForUserDefinedTables")
public class IS {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "is_id")
    private Integer id;

    private String value;
    ...
}

HQL查询

from PID where administrativeSex is null or administrativeSex.value = 'M'

生成的SQL

select
  pid0_.pid_id as pid1_84_,
  pid0_.administrativeSex as adminis11_84_,
  pid0_.birthOrder as birthOrder84_,
  pid0_.birthPlace as birthPlace84_,
  pid0_.citizenship as citizen12_84_,
  pid0_.countyCode as countyCode84_,
  pid0_.dateTimeOfBirth as dateTim19_84_,
  pid0_.driverLicenseNumber as driverL22_84_,
  pid0_.maritalStatus as maritalS8_84_,
  pid0_.multipleBirthIndicator as multiple4_84_,
  pid0_.nationality as nationa17_84_,
  pid0_.owner_id as owner9_84_,
  pid0_.patientAccountNumber as patientA6_84_,
  pid0_.patientDeathDateAndTime as patient16_84_,
  pid0_.patientDeathIndicator as patient18_84_,
  pid0_.patientId as patientId84_,
  pid0_.primaryLanguage as primaryL7_84_,
  pid0_.race as race84_,
  pid0_.religion as religion84_,
  pid0_.setId as setId84_,
  pid0_.ssnNumber as ssnNumber84_,
  pid0_.veteransMilitaryStatus as veterans2_84_
 from
  PatientIdentification pid0_,
  CodedValueForUserDefinedTables is1_
 where
  pid0_.administrativeSex=is1_.is_id
  and (
   pid0_.administrativeSex is null
   or is1_.value='M'
  )

该查询仅返回管理性别设置为"M"的PID.它缺少一个没有行政性的人.如果查看SQL查询,这是正常的.如何更正我的HQL查询？

Answer 1

hibernate参考手册写道:

HQL支持两种形式的关联连接:隐式和显式.

上一节中显示的查询都使用显式形式,即在from子句中显式使用join关键字的位置.这是推荐的表格.

隐式表单不使用join关键字.相反,使用点符号"解除引用"关联.隐式连接可以出现在任何HQL子句中.隐式连接导致生成的SQL语句中的内部联接.

由于内部联接过滤掉了连接条件不匹配的行,因此您缺少未知性别的人.您将需要一个左外连接,您必须要求明确:

from PID pid
left outer join pid.administrativeSex as sex 
where pid.administrativeSex is null or sex.value = 'M'