如果使用SQL 通過Hibernate查詢數(shù)據(jù)庫，如果SQL中使用了別名，則所有的查詢字段必須使用別名，并且使用addScalar方法告訴hibernate使用了那些別名，否則，查詢會出錯。

StringBuffer sql = new StringBuffer();
??sql.append(
????"SELECT sc.id as commentId, sc.content AS commentContent, sc.comment_uid as commentatorUId,sc.created_time as commentCreatedTime,")
????.append(" geo.region_desc as regionDesc, bmForCommentator.realname AS commentatorRealName, bfForCommentator.avatar_mobile AS commentatorAvatar,")
????.append(" sh.content AS shareContent,shc.img_url as shareCoverImgUrl, bmForSharer.realname AS sharerRealName, bfForSharer.avatar_mobile AS sharerAvatar")
????.append(" FROM snsec_axis_share_comment sc")
????.append(" JOIN snsec_axis_share sh ON (sc.share_id = sh.id AND sh.id = ?)")
????.append(" LEFT JOIN snsec_members_geo geo ON (sc.member_geo_id = geo.id)")
????.append(" LEFT JOIN bbs_members bmForCommentator ON (sc.comment_uid = bmForCommentator.uid)")
????.append(" LEFT JOIN bbs_memberfields bfForCommentator ON (sc.comment_uid = bfForCommentator.uid)")
????.append(" LEFT JOIN snsec_axis_share_cover shc ON (sh.uid = shc.uid)")
????.append(" LEFT JOIN bbs_members bmForSharer ON (sh.uid = bmForSharer.uid)")
????.append(" LEFT JOIN bbs_memberfields bfForSharer ON (sh.uid = bfForSharer.uid)")
????.append(" WHERE sc.created_time > ?");

??List<Map> resultList = queryWithAlias(sql.toString(), page,
????new Object[] { shareId, maxTime });

private List<Map> queryWithAlias(final String sql, final Page page,
???final Object[] params) {
??StringBuffer sqlForCountReturnResult = new StringBuffer("select count(*) ");
???sqlForCountReturnResult.append(sql.substring(sql.toUpperCase().indexOf("FROM")));
??Integer totalCount = super.countBySQLArgs(sqlForCountReturnResult.toString(),
????params);
??page.setRecordCount(totalCount);
??if (totalCount == 0) {
???return new ArrayList<Map>();
??}
??return getHibernateTemplate().executeFind(new HibernateCallback() {
???public Object doInHibernate(Session session)
?????throws HibernateException, SQLException {

????SQLQuery query = session.createSQLQuery(sql);
????query.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
????
????query.addScalar("commentId", Hibernate.BIG_INTEGER);
????query.addScalar("commentContent", Hibernate.STRING);
????query.addScalar("commentatorUId", Hibernate.STRING);
????query.addScalar("commentCreatedTime", Hibernate.TIMESTAMP);
????query.addScalar("regionDesc", Hibernate.STRING);
????query.addScalar("commentatorRealName", Hibernate.STRING);
????query.addScalar("commentatorAvatar", Hibernate.STRING);
????query.addScalar("shareContent", Hibernate.STRING);
????query.addScalar("shareCoverImgUrl", Hibernate.STRING);
????query.addScalar("sharerRealName", Hibernate.STRING);
????query.addScalar("sharerAvatar", Hibernate.STRING);
????if (params != null && params.length > 0) {
?????for (int i = 0; i < params.length; i++) {
??????query.setParameter(i, params[i]);
?????}
????}
????return query.setFirstResult(page.getFirstResult())
??????.setMaxResults(page.getRows()).list();
???}
??});
?}

?

轉(zhuǎn)載于:https://blog.51cto.com/keeplearning/1158795

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