Spring JPQL-Joins-MultipleTables和空ResultList
我在JPQL中有一个通过5个表的查询,但如果其中一个表为NULL,则整个查询将失败,resultList为空,并引发异常。另一方面,如果所有表都不包含null,那么它将按预期工作 如何实现它以将表不为null的所有对象和为null的对象返回为null?所以我会得到-Object1[],null,null,null,例如。。。而且不仅仅是空的结果列表。。。 非常感谢:)Spring JPQL-Joins-MultipleTables和空ResultList,spring,hibernate,spring-mvc,spring-boot,jpa,Spring,Hibernate,Spring Mvc,Spring Boot,Jpa,我在JPQL中有一个通过5个表的查询,但如果其中一个表为NULL,则整个查询将失败,resultList为空,并引发异常。另一方面,如果所有表都不包含null,那么它将按预期工作 如何实现它以将表不为null的所有对象和为null的对象返回为null?所以我会得到-Object1[],null,null,null,例如。。。而且不仅仅是空的结果列表。。。 非常感谢:) public List getAdditionalInformation(字符串ppin){ Query Query=em.cr
public List getAdditionalInformation(字符串ppin){
Query Query=em.createQuery(“从患者p JOIN p.placements pl JOIN pl.room r中选择p、pl、r、d、do”
+“加入r.d部门加入d.doctors,p.pin=:ppin”);
setParameter(“ppin”,ppin);
返回query.getResultList();
}
@交易的
公共附加PD getAdditional(字符串PPN){
列表=hr.getAdditionalInformation(PPN);
AdditionalPD adp=新的AdditionalPD();
患者=空;
位置=空;
房间=空;
部门=空;
医生=空;
对于(对象[]对象:列表){
患者=(患者)对象[0];
placement=(placement)对象[1];
房间=(房间)对象[2];
部门=(部门)对象[3];
医生=(医生)对象[4];
}
adp.setPatientFirstName(patient.getFirstName());
adp.setPatientLastName(patient.getLastName());
adp.setAge(countAge(ppin));
adp.setFrom(placement.getFrom());
adp.setTo(placement.getTo());
adp.setRoomName(room.getName());
adp.setDepartmentName(department.getName());
adp.setDoctorFirstName(doctor.getFirstName());
adp.setDoctorLastName(doctor.getLastName());
返回adp;
}
@GetMapping(“/additional/pin/{ppin}”)
公共字符串附加信息(@PathVariable字符串ppin,模型){
AdditionalPD adp=has.getAdditional(ppin);
model.addAttribute(“adp”,adp);
返回“附加”;
}
使用左连接
而不是连接
。默认情况下,JPQL联接是内部联接 看
public List<Object[]> getAdditionalInformation(String ppin) {
Query query = em.createQuery("SELECT p, pl, r, d, do FROM Patient p JOIN p.placements pl JOIN pl.room r"
+ " JOIN r.department d JOIN d.doctors do where p.pin = :ppin");
query.setParameter("ppin", ppin);
return query.getResultList();
}
@Transactional
public AdditionalPD getAdditional(String ppin) {
List<Object[]> list = hr.getAdditionalInformation(ppin);
AdditionalPD adp = new AdditionalPD();
Patient patient = null;
Placement placement = null;
Room room = null;
Department department = null;
Doctor doctor = null;
for(Object[] object : list) {
patient = (Patient) object[0];
placement = (Placement) object[1];
room = (Room) object[2];
department = (Department) object[3];
doctor = (Doctor) object[4];
}
adp.setPatientFirstName(patient.getFirstName());
adp.setPatientLastName(patient.getLastName());
adp.setAge(countAge(ppin));
adp.setFrom(placement.getFrom());
adp.setTo(placement.getTo());
adp.setRoomName(room.getName());
adp.setDepartmentName(department.getName());
adp.setDoctorFirstName(doctor.getFirstName());
adp.setDoctorLastName(doctor.getLastName());
return adp;
}
@GetMapping("/additional/pin/{ppin}")
public String additionalInformation(@PathVariable String ppin, Model model) {
AdditionalPD adp = has.getAdditional(ppin);
model.addAttribute("adp", adp);
return "additional";
}