我正在尝试使用帐户和条目实体之间的@OneToOne关系过滤数据。 我需要做的是搜索具有Account.glcode =“15”
的Entry-s这是我所做的，但它不起作用。
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" )));
我的入门课程
@Entity
public class Entry {
@Id
private Long id;
.........
@OneToOne
@JoinColumn(name = "account_id", nullable = false)
private Account account;
这是帐户类
@Entity
public class Account {
@Id @GeneratedValue
private Long id;
private Long glCode;
任何人都可以告诉我我做错了吗？
由于
已更新
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;
}
}
答案 0 :(得分：1)
glCode的参数是String，但必须是long。并使用更好的ParameterExpression，
示例：
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();
}