Question

我有以下QueryDSL语句：

BooleanExpression alwaysTrueExpression = match(null, null, datePeriod, period);

if (minAmount != null) {
    alwaysTrueExpression = alwaysTrueExpression.and(aggregatedOrder.totalUnitAmountWithoutTax.sum().goe(minAmount));
}
if (maxAmount != null) {
    alwaysTrueExpression = alwaysTrueExpression.and(aggregatedOrder.totalUnitAmountWithoutTax.sum().loe(maxAmount));
}

JPAQuery<AggregatedOrder> query = selectFrom(aggregatedOrder);
query = query.where(alwaysTrueExpression);
log.debug("sql={}", query);

return query.transform(GroupBy.groupBy(aggregatedOrder.tradingPromoterBranch.promoter).as(GroupBy.sum(aggregatedOrder.totalUnitAmountWithoutTax)));

但是会引发错误：

Caused by: org.postgresql.util.PSQLException: ERROR: aggregate functions are not allowed in WHERE

我想按启动子对aggregatedOrder进行分组，并用金额进行过滤。

Answer 1

我认为您正在混合使用Querydsl支持的两种分组方式：

query.transform（...）：一旦从数据库中获取数据，就将结果分组到内存中。在这种情况下，查询不会包含“ group by”子句，并且数据转换是在“ java端”执行的。
query.groupBy（...）：将group by子句添加到您的查询中。在这种情况下，分组由数据库执行。

如果查询中需要聚合函数，则需要使用“ query.groupBy（...）”提供“分组依据”列。

Answer 2

这是我汇总列并按总和过滤的方法：

BooleanExpression alwaysTrueExpression = Expressions.asBoolean(true).isTrue();

NumberExpression<BigDecimal> totalUnitAmountWithoutTax = aggregatedOrder.totalUnitAmountWithoutTax.sum();
NumberExpression<Integer> totalQuantity = aggregatedOrder.quantity.sum();
NumberPath<Long> qPromoter = aggregatedOrder.tradingPromoterBranch.promoter.id;

BooleanExpression amountExpression = Expressions.asBoolean(true).isTrue();
if (minAmount != null) {
    amountExpression = amountExpression.and(totalUnitAmountWithoutTax.goe(minAmount));
}
if (maxAmount != null) {
    amountExpression = amountExpression.and(totalUnitAmountWithoutTax.loe(maxAmount));
}

JPAQuery<Tuple> query = jpaQueryFactory.select(qPromoter, totalUnitAmountWithoutTax, totalQuantity).from(aggregatedOrder).groupBy(qPromoter);
query = query.where(alwaysTrueExpression).having(amountExpression);

return query.fetch();

QueryDSL GroupBy和求和

2 个答案: