[英]Spring Data JPA Specifications Calling
我按照本教程獲取Spring Data JPA規范: https : //dzone.com/articles/using-spring-data-jpa-specification
它為我實現了這一目標,但是我無法調用規范方法來搜索它們。 我想將它們放入我的SearchController中:
public static Specification<Telefonbuch> hasVorname(String vorname) {
return (root, query, cb) -> {
return cb.equal(root.get(Telefonbuch_.vorname), "%"+vorname.toLowerCase()+"%");
};
}
現在,我想在我的SearchController(zhiController)中調用此方法,但是我不知道如何。 目前,該方法如下所示:
public void search(String vorname, String nachname, String telefonnummer, String handynummer) {
telefonbuch.setVorname(vorname);
telefonbuch.setNachname(nachname);
telefonbuch.setTelefonnummer(telefonnummer);
telefonbuch.setHandynummer(handynummer);
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Telefonbuch> query = builder.createQuery(Telefonbuch.class);
Root<Telefonbuch> root = query.from(Telefonbuch.class);
List<Predicate> predicates = new ArrayList<Predicate>();
if (!vorname.isEmpty()) {
//eintraege = telefonbuchRepository.findAll(hasVorname()); -> does not work
Predicate condition = builder.like(builder.lower(root.get(Telefonbuch_.vorname)), "%"+vorname.toLowerCase()+"%");
predicates.add(condition);
}
...
query.select(root).where(predicates.toArray(new Predicate[predicates.size()]));
您需要有一個實現JpaRepository
和JpaSpecificationExecutor
TelefonbuchRepository接口。 后者為您提供方法,您可以將Specification
傳遞給該方法:
- long count(Specification<T> spec)
- List<T> findAll(Specification<T> spec)
- Page<T> findAll(Specification<T> spec, Pageable pageable)
- List<T> findAll(Specification<T> spec, Sort sort)
- Optional<T> findOne(Specification<T> spec)
編輯:MySpecification:
public class MyEntitySpecification implements Specification<MyEntity> {
private final String searchText;
public MyEntitySpecification(String searchText) {
this.searchText = searchText;
}
@Override
public Predicate toPredicate(Root<MyEntity> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
List<Predicate> predicates = new ArrayList<>();
Optional.ofNullable(searchText).ifPresent(
s -> predicates.add(cb.like(cb.lower(root.get(MyEntity_.searchString)), "%" + s.toLowerCase() + "%"))
);
return cb.and(predicates.toArray(new Predicate[predicates.size()]));
}
}
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