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

Question

我有两个表Item和Nikasa-其定义是这样的:

Item { id, name, spec}和Nikasa {id, date, item_id}.这里item_id代表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NonUniqueDiscoveredSqlAliasException : Encountered a duplicated sql alias [ID] during auto-discovery of a native-sql query在线上得到例外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)