我正在使用带有hibernate 5.2.9的org.springframework.boot 1.5.2的Spring Data Rest。我想要实现的是一种使用JPA查询sort,filter,pageable的方法,可以返回实体的子集或返回一个投影。
以下是使用的代码: (1)过滤规范 (2)投影和摘录在收集中应用投影 (3)试图返回Page的控制器, 但它仅在返回类型为Page时有效。 Student是实体,StudentLite是投影
问题是: (1)如何查询返回页面投影的查询+排序+过滤器 (2)可以将摘录应用于该查询吗? (3)在@RepositoryRestController中使用@JsonView解决什么方法?
StudentRepository类
@RepositoryRestResource(excerptProjection = StudentLite.class)
public interface StudentRepository extends PagingAndSortingRepository<Student,Long>,
JpaSpecificationExecutor<Student> {}
和 学生指定课程
public class StudentSpecification {
public static Specification<Student> filteredStudentList(StudentSearch c) {
final StudentSearch criteria = c;
return new Specification<Student>() {
@Override
public Predicate toPredicate(Root<Student> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
Join<Student, Contact> joinContact = root.join(Student_.contact);
Path<Contact> contact = root.get(Student_.contact);
Path<String> officialId = root.get(Student_.officialId);
Path<String> name = root.get(Student_.name);
Path<String> email = contact.get(Contact_.email);
Path<String> phoneMobile = contact.get(Contact_.phoneMobile);
final List<Predicate> predicates = new ArrayList<Predicate>();
if(criteria.getOfficialId()!=null) {
predicates.add(cb.like(officialId, "%" + criteria.getOfficialId() + "%"));
System.out.println("==not null...criteria.getOfficialId()="+criteria.getOfficialId()+" :officialId="+officialId.toString());
}
if(criteria.getName()!=null) {
predicates.add(cb.like(name, "%"+criteria.getName()+"%"));
}
if(criteria.getEmail()!=null) {
predicates.add(cb.like(email, "%"+criteria.getEmail()+"%"));
}
if(criteria.getPhoneMobile()!=null) {
predicates.add(cb.like(phoneMobile, "%"+criteria.getPhoneMobile()+"%"));
}
return cb.and(predicates.toArray(new Predicate[predicates.size()]));
}
};
}
}
以及使用@ExposesResourceFor(Student.class)和@RepositoryRestController注释类的控制器:
@RequestMapping(method=RequestMethod.GET)
public @ResponseBody Page<StudentLite> getStudentList(Pageable pageable, @RequestParam Map<String,String> criteria) {
StudentSearch ss = new StudentSearch(criteria);
// Below statement fail, as findAll(...) is suppose to return Page<Student>
Page<StudentLite> pagedStudentLite = studentRep.findAll( StudentSpecification.filteredStudentList(ss), pageable);
return pagedStudentLite;
}