我有两个表Item,它们Nikasa的定义如下:
Item
Nikasa
Item { id, name, spec}和Nikasa {id, date, item_id}.这里item_id代表Item.id。
Item { id, name, spec}
Nikasa {id, date, item_id}.
item_id
Item.id
我做了一个简单的本地SQL只能加入到选择Item.id和Nikasa.id为:
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();
但是我NonUniqueDiscoveredSqlAliasException : Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query在行上遇到异常List result=sq.list();:
NonUniqueDiscoveredSqlAliasException : Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query
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)
您能建议出什么事了吗?
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)