HSQLDB:遇到重复的sql别名

Question

当我从java程序中使用自连接执行这个查询时

Query query = session.createSQLQuery("SELECT DISTINCT * " +
            "FROM lerneinheit AS le1 JOIN lerneinheit AS le2  " +
            "ON le1.datum = le2.datum AND le1.pid = le2.pid " +
            " WHERE " +
            "  le1.datum BETWEEN  '2016-10-20' AND '2016-10-20'  AND " +
            "  le1.pid = 3 AND " +
            "  (le1.abgesagtrechtzeitig = false OR  le1.nichtabgesagt = true OR le1.erschienen=true) AND " +
            "  (le2.abgesagtrechtzeitig = false OR  le2.nichtabgesagt = true OR le2.erschienen=true) AND " +
            "  le1.lernid!= le2.lernid AND " +
            "  (le2.beginn+1 BETWEEN le1.beginn AND le1.ende OR le2.ende-1 BETWEEN le1.beginn AND le1.ende) " +
            " ORDER BY le1.beginn");

我得到以下错误：

org.hibernate.loader.custom.NonUniqueDiscoveredSqlAliasException: Encountered a duplicated sql alias [LERNID] during auto-discovery of a native-sql query

不过，如果我在phpAdmin中执行此操作，则可以很好地工作。我在这个话题上找到的所有东西都没有任何帮助。有人知道怎么解决这个问题吗？

Answer 1

我不确定，但是!=的HQL等价物是<>，所以你应该写" le1.lernid <> le2.lernid AND"

顺便说一句，我建议：

Query query = session.createSQLQuery("SELECT DISTINCT * " +
        "FROM lerneinheit AS le1 JOIN lerneinheit AS le2  " +
        "ON le1.datum = le2.datum AND le1.pid = le2.pid " +
        " WHERE " +
        "  le1.datum BETWEEN  :dateMin AND :dateMax  AND " +
        "  le1.pid = :le1Pid AND " +
        "  (le1.abgesagtrechtzeitig = false OR  le1.nichtabgesagt = true OR le1.erschienen=true) AND " +
        "  (le2.abgesagtrechtzeitig = false OR  le2.nichtabgesagt = true OR le2.erschienen=true) AND " +
        "  le1.lernid!= le2.lernid AND " +
        "  (le2.beginn+1 BETWEEN le1.beginn AND le1.ende OR le2.ende-1 BETWEEN le1.beginn AND le1.ende) " +
        " ORDER BY le1.beginn");
query.setParametter("dateMin", "2016-10-20"); 
query.setParametter("dateMax", "2016-10-20"); 
query.setParametter("le1Pid", 3);