我对Criteria Query存在严重问题。
我的实体类看起来像这样:
class X {
...
@Columns(columns = {
@Column(name = "priceCurrency", nullable = false),
@Column(name = "priceAmount", nullable = false)})
@Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentBigMoneyAmountAndCurrency")
@Basic(fetch = FetchType.EAGER)
BigMoney price;
...
}
我有另一个Y级,List<X> xs
。
我还有一个正常的正常 JPA查询:
SELECT y
FROM Y y
LEFT JOIN y.xs x
GROUP BY y
ORDER BY SUM(y.price.amount)
现在我想把它转移到CriteriaQuery。我开始时:
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Y> q = cb.createQuery(Y.class);
Root<Y> root = q.from(Y.class);
ListJoin<Y, X> j = root.join(Y_.xs, JoinType.LEFT);
q.groupBy(root);
我尝试了一些东西,但没有一个有效:(这里有几个例子:
Path<BigDecimal> x = j.get("priceAmount");
或:
Path<BigDecimal> x = j.get("price.amount");
或:
Path<BigDecimal> x = j.get(X_.price).get("amount");
我做错了什么?
现在我将坚持使用一个小解决方案,但它可以解决问题:
class X {
...
@Column(name = "priceCurrency", nullable = false)
@Basic(fetch = FetchType.EAGER)
String priceCurrency;
@Column(name = "priceAmount", nullable = false)
@Basic(fetch = FetchType.EAGER)
String priceAmount;
...
public BigMoney getPrice() {
return BigMoney.of(CurrencyUnit.of(priceCurrency), priceAmount);
}
public void setPrice() {
this.priceCurrency = price.getCurrencyUnit().toString();
this.priceAmount = price.getAmount();
}
}
现在Criteria Query看起来像:
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Y> q = cb.createQuery(Y.class);
Root<Y> root = q.from(Y.class);
ListJoin<Y, X> j = root.join(Y_.xs, JoinType.LEFT);
q.groupBy(root);
Path<BigDecimal> a = j.get(X_.priceAmount);
TypedQuery<Y> tq = entityManager.createQuery(q);