Question

如何在JPQL中获取SQL查询下面的总结果行：

select
        count(usertransa0_.id) as col_0_0_ 
    from
        user_transaction usertransa0_ cross 
    join
        merchant_master merchantma1_ 
    where
        usertransa0_.merchant_master=merchantma1_.id 
        and usertransa0_.status=0 
        and (
            usertransa0_.transaction_date between '2015-02-19' and '2015-02-20'
        ) 
    group by
        merchantma1_.full_name;

我尝试过：

SELECT COUNT(ut)
    FROM UserTransaction ut 
    WHERE ut.status = :stus AND ut.transactionDate between :frm AND :toDt"
    GROUP BY ut.merchantMaster.fullName

但它只返回第一行计数，如何获得总行数？

编辑：

我的实体看起来像：

public class UserTransaction extends BaseEntity {

    @OneToOne(fetch = FetchType.LAZY)
    private UserInfo info;

    @OneToOne(fetch = FetchType.LAZY)
    private MerchantMaster merchantMaster;

    @OneToOne(fetch = FetchType.LAZY)
    private PaymentMaster paymentMaster;

    @Column(name = "AMOUNT")
    private BigDecimal amount;

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "TRANSACTION_DATE")
    private Date transactionDate;

    @Column(name = "STATUS")
    private Integer status;

    private String userTransactionID;

    @OneToOne(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY)
    private UserTransactionRequest trRequest;

    @OneToOne(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY)
    private UserTransactionResponse trResponse;

    //getters & setters
}

Answer 1

您的查询将返回Long数组。对于给定的MerchantMaster名称，每个Long都是UserTransaction的计数。

如果你在NamedQuery中有查询，你可以使用（如果没有，你可以使用creatyQuery()方法并使用你的JPQL查询字符串）：

TypedQuery<Long> query = em.createNamedQuery("UserTransaction.MyQuery", Long.class);
/* The list have the count of User Transaction grouped by Merchant name */
List<Long> userTransactionsPerMerchantName = query.getResultList();

您可能还需要商家名称，您可以将商家名称添加到您的查询中：

SELECT COUNT(ut), ut.merchantMaster.fullName
FROM UserTransaction ut 
WHERE ut.status = :stus AND ut.transactionDate between :frm AND :toDt"
GROUP BY ut.merchantMaster.fullName

现在，查询将返回一个对象数组，第一个对象是count，第二个是名称。您还需要修改代码以获得结果：

TypedQuery<Object[]> query = em.createNamedQuery("UserTransaction.MyQuery", Object[].class);
List<Object []> results = query.getResultList();
for (Object [] row : results) {
    Long count = (Long) row[0];
    String name = (String) row[1];
}

JPA计数查询以按查询计算组的总结果行

1 个答案: