当两个表具有相同的列名时，NonUniqueDiscoveredSqlAliasException

我有两个表Item和Nikasa – 其定义如下：

Item { id, name, spec}和Nikasa {id, date, item_id}. 这里item_id表示Item.id

我做了一个简单的原生SQL连接，只选择Item.id和Nikasa.id ：

 Session s = getSession(); SQLQuery sq = s.createSQLQuery("SELECT it.id, nik.id FROM item it LEFT JOIN nikasa nik ON (it.id = nik.item_id)"); List result = sq.list(); 

但我得到exceptionNonUniqueDiscoveredSqlAliasException : Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query List result=sq.list(); NonUniqueDiscoveredSqlAliasException : Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query行List result=sq.list(); ：

堆栈跟踪 ：

 org.hibernate.loader.custom.NonUniqueDiscoveredSqlAliasException: Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:594) at org.hibernate.loader.Loader.getResultSet(Loader.java:1986) at org.hibernate.loader.Loader.doQuery(Loader.java:829) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289) at org.hibernate.loader.Loader.doList(Loader.java:2463) at org.hibernate.loader.Loader.doList(Loader.java:2449) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279) at org.hibernate.loader.Loader.list(Loader.java:2274) at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:331) at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1585) at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:224) at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:156) 

你能告诉我发生了什么错吗？

Answer 1

您需要设置结果别名。

 SELECT it.id as itemid, nik.id as nikasaid FROM item it LEFT JOIN nikasa nik ON (it.id = nik.item_id)