我需要帮助!
我需要建立规范
SELECT date_trunc('day', start_time)
FROM Example
GROUP BY date_trunc('day', start_time)
(PostgreSQL)
我有代码:
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Object[]> query = cb.createQuery(Object[].class);
Root<Example> root = query.from(Example.class);
Expression<Date> exp = cb.function("date_trunc", Date.class , cb.literal("day"), root.get("startTime"));
List<Object[]> result = entityManager.createQuery(query.select(exp).groupBy(exp)).getResultList();
但我得到了例外:
Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:106)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:79)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2122)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1905)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1881)
at org.hibernate.loader.Loader.doQuery(Loader.java:925)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
at org.hibernate.loader.Loader.doList(Loader.java:2622)
at org.hibernate.loader.Loader.doList(Loader.java:2605)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2434)
at org.hibernate.loader.Loader.list(Loader.java:2429)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483)
... 122 common frames omitted
Caused by: org.postgresql.util.PSQLException: ERROR: column "examplei0_.start_time" must appear in the GROUP BY clause or be used in an aggregate function
Position: 69
我做错了什么?
休眠 SQL:
select date_trunc(?, examplei0_.start_time) as col_1_0_ from examplei0_ group by date_trunc(?, examplei0_.start_time)
如果我在数据库控制台中执行它,它就会起作用。
我猜 Postgres 看到了
select date_trunc(?, examplei0_.start_time) as col_1_0_ from examplei0_ group by date_trunc(?, examplei0_.start_time)
并拒绝,因为第一个date_trunc(?, examplei0_.start_time)
不一定与第二个相同date_trunc(?, examplei0_.start_time)
而不查看传入的实际参数。
如果是这种情况,您需要 hibernate 生成一个查询,其中'day'
没有参数化。或者,在 postgres 中创建一个函数date_trunc_day(timestamp)
那个叫date_trunc('day', timestamp)
并调用新函数。
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