Criteria APIは2つのエンティティーを結合します

Question

AccountとEntry Entities間の@OneToOne関係でデータをフィルター処理しようとしています。 私がする必要があるのは、Account.glcode = "15"を持つEntry-sを検索することです。

ここでは行っていますが、動作していません。

Root<?> root = mainQuery.from(Entry.class); 
Predicate predicate = builder.conjunction(); 
Join<Entry,Account> entries = root.join("account"); 
predicate = builder.and((builder.equal(entries.get("glCode"),"15"))); 

マイエントリークラス

@Entity 
public class Entry { 

@Id 
private Long id; 
......... 

@OneToOne 
@JoinColumn(name = "account_id", nullable = false) 
private Account account; 

これは誰もが私が間違ってやっているものを私に伝えることができますか？Accountクラス

@Entity 
public class Account { 

@Id @GeneratedValue 
private Long id; 
private Long glCode; 

ですか

おかげ

を更新し

public PaginationResult getFilteredData(List<FilterConstraint> filters, Object classname) { try { CriteriaBuilder builder = em.getCriteriaBuilder(); CriteriaQuery<?> mainQuery = builder.createQuery(classname.getClass()); Root<?> root = mainQuery.from(GLJournalEntry.class); Predicate predicate = builder.conjunction(); Predicate enumPredicate = builder.conjunction(); Predicate today = builder.conjunction(); Predicate on = builder.conjunction(); for (FilterConstraint constraint : filters) { //IT is hard coded right now for testing purpose but should be customized for the future if(constraint.getField().getValue().contains("-")){ String[] items = constraint.getField().getValue().split("-"); Join<GLJournalEntry,GLAccount> entries = root.join("glAccount"); predicate = builder.and((builder.equal(entries.get("glCode"), constraint.getValues().getValue()))); entries.getAttribute().toString(); break; } switch (constraint.getOperator()) { case AFTER: predicate = builder.and(builder.greaterThan(root.get(constraint.getField().getValue()), constraint.getValues().getStartDate())); break; case BEFORE: predicate = builder.and(builder.greaterThan(root.get(constraint.getField().getValue()), constraint.getValues().getStartDate())); break; case BETWEEN: if (constraint.getField().getType() == FieldDataType.DATE) { predicate = builder.and(builder.between(root.get(constraint.getField().getValue()), constraint.getValues().getStartDate(), constraint.getValues().getEndDate())); } else if (constraint.getField().getType() == FieldDataType.INTEGER) { predicate = builder.and(builder.between(root.get(constraint.getField().getValue()), Integer.valueOf(constraint.getValues().getMinValue()), Integer.valueOf(constraint.getValues().getMaxValue()))); } else { predicate = builder.and(builder.between(root.get(constraint.getField().getValue()), constraint.getValues().getMinValue(), constraint.getValues().getMaxValue())); } break; case EMPTY: predicate = builder.and(builder.isEmpty(root.get(constraint.getField().getValue()))); break; case EQUALS: if (constraint.getField().getType() == FieldDataType.ENUM) { Object enumV = null; if (constraint.getValues().getEnumValue().size() > 1) { List<Predicate> predicates = new ArrayList<>(); for (EnumValue enumValue : constraint.getValues().getEnumValue()) { for (Field f : classname.getClass().getDeclaredFields()) { if (f.getName().equals(constraint.getField().getValue())) { System.out.println("T"); Class<?> clz = f.getType(); Object[] consts = clz.getEnumConstants(); for (int i = 0; i < consts.length - 1; i++) { if (consts[i].toString().equals(enumValue.getValue())) { enumV = consts[i]; break; } } } } predicates.add(builder.equal(root.get(constraint.getField().getValue()), enumV)); } enumPredicate = builder.and(builder.or(predicates.toArray(new Predicate[]{}))); break; } for (Field f : classname.getClass().getDeclaredFields()) { if (f.getName().equals(constraint.getField().getValue())) { System.out.println("T"); Class<?> clz = f.getType(); Object[] consts = clz.getEnumConstants(); for (int i = 0; i < consts.length - 1; i++) { if (consts[i].toString().equals(constraint.getValues().getEnumValue().get(0).getValue())) { enumV = consts[i]; break; } } } } enumPredicate = builder.equal(root.get(constraint.getField().getValue()), enumV); break; } predicate = builder.and(builder.equal(root.get(constraint.getField().getValue()), constraint.getValues().getValue())); break; case LESS_THAN: predicate = builder.and(builder.lessThan(root.get(constraint.getField().getValue()), constraint.getValues().getValue())); break; case MORE_THAN: predicate = builder.and(builder.greaterThan(root.get(constraint.getField().getValue()), constraint.getValues().getValue())); break; case NOT_EMPTY: predicate = builder.and(builder.isNotEmpty(root.get(constraint.getField().getValue()))); break; case ON: on = builder.between(root.get(constraint.getField().getValue()), DateUtils.getFirstSecondOfDate(constraint.getValues().getStartDate()), DateUtils.getLastSecondOfDate(constraint.getValues().getStartDate())); break; case STARTS_WITH: case TODAY: today = builder.and(builder.between(root.get(constraint.getField().getValue()), DateUtils.getFirstSecondOfDate(new Date()), DateUtils.getLastSecondOfDate(new Date()))); break; } } CriteriaQuery<Long> cq = builder.createQuery(Long.class); cq.select(builder.count(cq.from(classname.getClass()))); em.createQuery(cq); cq.where(predicate, enumPredicate, today, on); Long count = em.createQuery(cq).getSingleResult(); mainQuery.where(predicate, enumPredicate, today, on); //Count for pagination TypedQuery<?> q = em.createQuery(mainQuery); q.setMaxResults(filters.get(0).getCount()); int firstResult = filters.get(0).getPage() * filters.get(0).getCount() - filters.get(0).getCount(); q.setFirstResult(firstResult); PaginationResult result = new PaginationResult(); result.setData((List<Client>) q.getResultList()); result.setMaxResults(count); System.out.println(result.getData().size()); return result; } catch (Exception e) { System.out.println(e.getMessage()); return null; } } 

Answer 1

glCodeのためのあなたのパラメータは文字列ですが、長さでなければなりません。そして、より良いParameterExpressionを使用し、

例：

それはエラーをスロー

public List<Entry> findEntryByGlCode(Long glCode) { 
    CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); 

    final CriteriaQuery<Entry> query = criteriaBuilder.createQuery(Entry.class); 
    final Root<Entry> root = query.from(Entry.class); 

    Join<Entry, Account> join = root.join("account"); 
    ParameterExpression<Long> glcodeParameter = criteriaBuilder.parameter(Long.class, "glCode"); 
    Predicate equal = criteriaBuilder.equal(join.get("glCode"), glcodeParameter); 

    query.where(equal); 
    query.select(root); 

    return entityManager.createQuery(query).setParameter("glCode", glCode).getResultList(); 
}