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我已经更改了第一个返回List的方法，但是我遇到了同样的异常。

我的Repository类中有2个本机查询。一种键入返回所有记录，另一种仅返回一行。见下文：

@Query(nativeQuery = true, value = NATIVE_SUMMARY_QUERY_PARTIAL + "group by (rjd.refresh_job_identifier)) as rc")
List<RefreshSummary> getRefreshJobDetailSummary();

@Query(nativeQuery = true, value = NATIVE_SUMMARY_QUERY_PARTIAL + " WHERE rjd.refresh_job_identifier = :refreshJobId" +
        " group by (rjd.refresh_job_identifier)) as rc")
List<RefreshSummary> getRefreshJobDetailSummaryById(@Param("refreshJobId") String refreshJobId);

interface RefreshSummary {
    String getRefreshJobId();
    Date getRefreshJobStart();
    Date getRefreshJobComplete();
    String getUserId();
    long getTotalRecords();
    long getSuccessfulRecords();
    long getPendingRecords();
    long getErrorRecords();
    long getCancelledRecords();
    String getRefreshJobStatus();
}

String NATIVE_SUMMARY_QUERY_PARTIAL = "SELECT  rc.refresh_job_identifier as refresh_job_id, ..."

第一种方法getRefreshJobDetailSummary可以正常工作。但是第二种方法，我只需要一行，就给了我这个例外：

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [com.trp.erd.repository.RefreshJobDetailRepository$RefreshSummary]

完整查询如下：

String NATIVE_SUMMARY_QUERY_PARTIAL = "SELECT  rc.refresh_job_identifier as refresh_job_id, " +
        "rc.refresh_job_start_time as refresh_job_start, " +
        "rc.record_completion_time as refresh_job_complete, " +
        "rc.user_id as user_id, " +
        "rc.pending + rc.successful + rc.cancelled + rc.error as total_records, " +
        "rc.successful as successful_records, " +
        "rc.pending as pending_records, " +
        "rc.error as error_records, " +
        "rc.cancelled as cancelled_records, " +
        "CASE WHEN pending > 0 THEN 'In progress' " +
        "ELSE 'Complete' " +
        "END as refresh_job_status " +
        "FROM " +
        "(SELECT rjd.refresh_job_identifier as refresh_job_identifier, " +
        "MAX(rjd.refresh_job_start_time) as refresh_job_start_time, " +
        "MAX(rjd.record_completion_time) as record_completion_time, " +
        "MAX(rjd.org_usr_nu) as user_id, " +
        "SUM(CASE WHEN LOWER(record_status) = 'pending' THEN 1 ELSE 0 END) as pending, " +
        "SUM(CASE WHEN LOWER(record_status) = 'successful' THEN 1 ELSE 0 END) as successful, " +
        "SUM(CASE WHEN LOWER(record_status) = 'cancelled' THEN 1 ELSE 0 END) as cancelled, " +
        "SUM(CASE WHEN LOWER(record_status) = 'error' THEN 1 ELSE 0 END) as error " +
        "from erd_cfg_owner.refresh_job_detail rjd " ;

查询返回的值如下：

'{20191218204913458trphc35, 2019-12-18 20:49:13.314, 2019-12-18 20:49:24.335, trphc35, 1, 1, 0, 0, 0, Complete}'

有人可以阐明这一点吗？为什么一种方法有效，而另一种无效？

Answer 1

我将您的第二种方法的返回类型从RefreshSummary替换为List<RefreshSummary>。从理论上讲，您的方法应该返回一个列表，而不是单个值

Answer 2

您可以尝试在查询声明中使用构造函数表达式还是通过创建自定义转换器。

remove()

Spring Data JPA：本机摘要获取ConverterNotFoundException

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2 个答案: