Question

目前，我正在为客户列表创建“过滤器”功能。

我有以下子查询，但不确定是否可以使用CriteriaBuilder进行构建。它也可以在没有多选b.date, ...的情况下工作，但我需要Group By，Order By和Limit才能选择最小值。结果应该是一个数字。

SELECT (COALESCE(SUM(b.account1),0) + COALESCE(SUM(b.account2),0) + COALESCE(SUM(b.deposits),0)) AS SUM FROM customer_balance b WHERE b.client_nr = '123455'
GROUP BY b.date
ORDER BY SUM
LIMIT 1

例如客户余额表

"client_nr","date","account1","account2","deposits"
"1234567","2018-02-28",204600.0,82500.0,21120.0

更新：这是我目前的代码，但是

Subquery<BigDecimal> CustomerBalanceSubQuery = CustomerQuery.subquery(BigDecimal.class);
Root<CustomerBalance> CustomerBalance = CustomerBalanceSubQuery.from(CustomerBalance.class);

Expression<BigDecimal> currentAccount = criteriaBuilder.sum(CustomerBalance.get("currentAccount"));
Expression<BigDecimal> overnightDeposits = criteriaBuilder.sum(CustomerBalance.get("overnightDeposits"));
Expression<BigDecimal> termDeposits = criteriaBuilder.sum(CustomerBalance.get("termDeposits"));

CustomerBalanceSubQuery.select(criteriaBuilder.sum(termDeposits, criteriaBuilder.sum(overnightDeposits, currentAccount)));
Predicate predicate = criteriaBuilder.equal(CustomerBalance.get("id").get("ClientNr"), Customer.get("ClientNr"));
CustomerBalanceSubQuery.where(predicate);

// adding to main-query
queryPredicateList.add(criteriaBuilder.and(criteriaBuilder.greaterThan(CustomerBalanceSubQuery, BigDecimal.valueOf(liquidity))));

如何为子查询添加orderBy？
如何设置maxResult？

谢谢！ B

Answer 1

与一些同事交谈后，我将查询重构为：

SELECT min(COALESCE(b.current_account,0) + COALESCE(b.overnight_deposits,0) + COALESCE(b.term_deposits,0)) FROM customer_balance b WHERE b.client_nr = '123456'

还有代码...

Subquery<BigDecimal> customerBalanceSubQuery = customerQuery.subquery(BigDecimal.class);
Root<CustomerBalance> customerBalance = customerBalanceSubQuery.from(CustomerBalance.class);

Expression<BigDecimal> currentAccount = customerBalance.get("currentAccount");
Expression<BigDecimal> overnightDeposits = customerBalance.get("overnightDeposits");
Expression<BigDecimal> termDeposits = customerBalance.get("termDeposits");

customerBalanceSubQuery.select(criteriaBuilder.min(criteriaBuilder.sum(termDeposits, criteriaBuilder.sum(overnightDeposits, currentAccount))));
Predicate predicate = criteriaBuilder.equal(customerBalance.get("id").get("clientNr"), customer.get("clientNr"));
customerBalanceSubQuery.where(predicate);

queryPredicateList.add(criteriaBuilder.and(criteriaBuilder.greaterThan(CustomerBalanceSubQuery, BigDecimal.valueOf(liquidity))));

无论如何，从原始问题中查看查询将很有趣。除了提到的@BillyFrost，我不确定是否每个SQL查询都可以使用Criteria API构建。

CriteriaBuilder JPA：在子查询/ groupby / maxresult

1 个答案: