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[英]QueryDsl BooleanBuilder: How to create a predicate that compares contents of list?
[英]QueryDsl BooleanBuilder: How to create a predicate that compares another field?
我有一個簡單的例子:查找所有售罄的商品。
Item 具有 initialQuantity 和 sellQuantity 整數字段。 (出於某種原因,我需要存儲初始數量)
我正在嘗試執行以下操作:
builder = new BooleanBuilder();
Predicate predicate = builder.and(item.initialQuantity.eq(item.soldQuantity)).getValue();
Iterable<Item> iterable = itemRepository.findAll(predicate);
但它沒有按預期返回。 “.eq()”看起來像是一個整數而不是 Path<>
首先聲明它:
JPAQueryFactory query = new JPAQueryFactory(em);
BooleanBuilder booleanBuilder = new BooleanBuilder();
QCreditRequest creditRequest = QCreditRequest.creditRequest;
然后,您可以包含您的業務邏輯,例如:
booleanBuilder.and(creditRequest.creditRequestId.eq(dataRequest.getCreditRequestId()));
if (StringUtils.isNotBlank(dataRequest.getProductId())){
booleanBuilder.and(creditRequest.product.productId.eq(dataRequest.getProductId()));}
最后返回結果,映射到您的 DTO :
return new HashSet<>(
query
.select(
Projections.constructor(
APResponse.class,
creditRequest.creditRequestId,
creditRequest.creditRequestDate,
creditRequest.product.productId,
creditRequest.creditRequestComment))
.from(creditRequest)
.innerJoin(creditRequest.product, product)
.innerJoin(creditRequest.status, creditRequestStatus)
.where(booleanBuilder)
.fetch());
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