我想在 java 中制作一个多重过滤器,我使用 Spring Boot。我的查询是使用条件编写的。
搜索应用程序.java:
@Entity
@Table(name = "searchapp")
public class SearchApp implements Serializable {
@Column(name = "code")
private String code;
@Column(name = "release")
private String release;
@Column(name = "environnement")
private String environnement;
@Column(name = "date")
private Date date;
private static final long serialVersionUID = -1701849052760947052L;
public SearchApp() {
super();
// TODO Auto-generated constructor stub
}
public DeploiementApp(String code, String release, String environnement, Date date) {
super();
this.code = code.toLowerCase();
this.release = release;
this.environnement = environnement;
this.date= date;
}
我有一个搜索 Controller ,它是进入我的应用程序的大门
搜索 Controller .java:
@Autowired
SearchService searchService;
@GetMapping("/filtersearch")
public List<SearchApp> filter(@RequestParam("code") String code, @RequestParam("release") String release, @RequestParam("environnement") String environnement, @RequestParam("date") String date) {
return searchService.filter(code.toUpperCase(), release.toUpperCase(), environnement.toUpperCase(), date);
}
搜索服务.java :
List<SearchApp> filter(String code, String environnement, String release, String date);
SearchServiceImpl.java :
@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager em;
public SearchServiceImpl(EntityManager em) {
super();
this.em = em;
}
@Override
public List<SearchApp> filter(String code, String release, String environnement, String date) {
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
format.setTimeZone(TimeZone.getTimeZone("Europe/Paris"));
Date dateBD = new Date();
dateBD = format.parse(date);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();
//select
CriteriaQuery<SearchApp> criteriaQuery = criteriaBuilder.createQuery(SearchApp.class);
//from
Root<SearchApp> itemRoot = criteriaQuery.from(SearchApp.class);
// attribut
List<Predicate> predicate = new ArrayList<Predicate>();
if( code != "" || code != null) {
Predicate predicateCode = criteriaBuilder.equal(itemRoot.get("code"), code);
predicate.add(predicateCode);
}
if( release != "" || release != null) {
Predicate predicateRelease = criteriaBuilder.equal(itemRoot.get("release"), release);
predicate.add(predicateRelease);
}
if( environnement != "" || environnement != null) {
Predicate predicateEnvironnement = criteriaBuilder.equal(itemRoot.get("environnement"), environnement);
predicate.add(predicateEnvironnement);
}
if( dateBD != null ) {
Predicate predicateDate = criteriaBuilder.equal(itemRoot.get("date"), date);
predicate.add(predicateDate);
}
Predicate And = criteriaBuilder.and(predicate.toArray(new Predicate[predicate.size()]));
//where
criteriaQuery.where(And);
List<SearchApp> result = em.createQuery(criteriaQuery).getResultList();
return result;
}
它不起作用。
错误:org.hibernate.query.criteria.internal.predicate.ComparisonPredicate@41f4f353 org.hibernate.query.criteria.internal.predicate.ComparisonPredicate@77ef22f7 还有日期错误
最佳答案
当您使用 toUpperCase() 时将值直接传递到服务层,如果值为 null 将中断,并且在服务层检查 null 后,在标准构建器中使用 upper,例如,
"criteriaBuilder.equal(criteriaBuilder.upper(itemRoot.get("code"), code.toUpperCase());"
使用 dateDB 而不是日期,字符串日期应该被解析为 Date 对象。希望它能解决您的问题。 @Column(名称=“日期”) 私有(private)约会日期; 日期列应该是数据库表中的日期。
关于java - 如何使用条件生成器使用多个过滤器进行搜索,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59468470/