如何使用条件构建器使用多个过滤器进行搜索

Question

我想在Java中做一个多重过滤器，我使用Spring Boot。我的查询是使用条件编写的。

SearchApp.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;    
}

我有一个搜索控制器，这是进入我的应用程序的门

SearchController.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);
}

SearchService.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[e-mail]@77ef22f7还日期错误

Answer 1

在使用toUpperCase（）时将值直接传递到服务层，如果值为null，并且在服务层检查为null之后，将在标准构建器中使用upper，例如，该值会中断，

"criteriaBuilder.equal(criteriaBuilder.upper(itemRoot.get("code"), code.toUpperCase());"

使用dateDB代替日期，并且字符串date应该解析为Date对象。希望它能解决您的问题。