Hibernate Ehcache不适用于SQL Native查询缓存

Question

我收到了错误

aliases expected length is 1; actual length is 4
    at org.hibernate.transform.CacheableResultTransformer.transformTuple

我有使用Eh-Cache的JPA + Hibernate配置和查询缓存以及二级缓存.

配置: PostgreSQL 9.6 + JPA 2.1 + Hibernate 5.2.3.Final

我试图用SqlResultSetMapping [自定义结果集类]执行NativeQuery.当我禁用缓存时,一切正常.

但是,当我启用缓存时,上面的错误.除了NativeQuery之外,Cache工作正常.

表SCHEMA:

PK  first   second  third   

---

 1  A       abc     C       
 2  A       abc     C       
 3  A       xyz     D       
 4  B       abc     C       
 5  B       xyz     C       
 6  B       abc     D       
 7  A       xyz     C       
 8  A       abc     D     

SQL Native QUERY:

SELECT  t.first,t.second,
    COUNT(t.second) total,
    COALESCE(t1.ccount, 0) ccount,
    COALESCE(t2.dcount, 0) dcount
FROM test t
LEFT JOIN (SELECT
    COUNT(third) AS ccount, FIRST, SECOND
    FROM test
    WHERE third = 'C'
    GROUP BY SECOND,FIRST) t1
ON (t1.first = t.first  AND t1.SECOND = t.SECOND)
LEFT JOIN (SELECT
    COUNT(third) AS dcount, FIRST, SECOND
    FROM test
    WHERE third = 'D'
    GROUP BY SECOND,FIRST) t2
ON (t2.first = t.first AND t2.SECOND = t.SECOND)
GROUP BY t.SECOND, t.first;

SqlResultSetMapping

 @SqlResultSetMapping(name = "RESULT_SET_NAME", classes = {
        @ConstructorResult( targetClass = TestResult.class,
            columns = { @ColumnResult(name = "first", type = String.class),
                        @ColumnResult(name = "second", type = String.class),
                        @ColumnResult(name = "total", type = String.class),
                        @ColumnResult(name = "ccount", type = String.class),
                        @ColumnResult(name = "dcount", type = String.class) }) })

query = getEntityManager().createNativeQuery(nativeQuery, "RESULT_SET_NAME");
query.setHint("org.hibernate.cacheable", true);
result = query.getResultList();

预期的结果集

first   second   total  ccount  dcount  
------  ------  ------  ------  --------
A       abc          3       2         1
B       abc          2       1         1
A       xyz          2       1         1
B       xyz          1       1         0

堆栈跟踪

aliases expected length is 1; actual length is 4
java.lang.IllegalStateException: aliases expected length is 1; actual length is 4
    at org.hibernate.transform.CacheableResultTransformer.transformTuple(CacheableResultTransformer.java:155)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:770)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:985)
    at org.hibernate.loader.Loader.doQuery(Loader.java:943)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
    at org.hibernate.loader.Loader.doList(Loader.java:2615)
    at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2460)
    at org.hibernate.loader.Loader.list(Loader.java:2422)
    at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:335)
    at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2129)
    at org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:981)
    at org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:147)
    at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1398)
    at org.hibernate.Query.getResultList(Query.java:417)

Answer 1

天啊，你不应该在本机查询中使用缓存，hibernate 不是为此设计的：

https://www.link-intersystems.com/blog/2011/10/08/impact-of-native-sql-queries-on-hibernates-second-level-cache/