涉及列表的Java类强制转换异常<;对象[]>;由Hibernate返回
首先,我正在维护一些我没有编写的代码,而且我对Java和Hibernate还相当陌生。我最近调整了一个在Hibernate会话中运行的查询。返回类型没有更改(它仍然是一个列表),但我将查询从session.createquery更改为session.createSQLquery。出于某种原因,这破坏了使用返回列表的代码 以下是消费方法:涉及列表的Java类强制转换异常<;对象[]>;由Hibernate返回,java,hibernate,Java,Hibernate,首先,我正在维护一些我没有编写的代码,而且我对Java和Hibernate还相当陌生。我最近调整了一个在Hibernate会话中运行的查询。返回类型没有更改(它仍然是一个列表),但我将查询从session.createquery更改为session.createSQLquery。出于某种原因,这破坏了使用返回列表的代码 以下是消费方法: public void getStuff(CompanyDAO company, ProductDAO dao, Long listingId, Long ye
public void getStuff(CompanyDAO company, ProductDAO dao, Long listingId, Long year, Long prodId, String startTag, String endAdFileTag, String letter) throws DAOException {
List<Object[]> Products = dao.loadStuff(year, prodId, listingId, letter);
if (Products != null && Products.size() > 0) {
for (Object[] p : Products) {
if (p != null) {
ProductListing parentChild = (ProductListing) p[0];
Long childCountObj = (Long) p[1];
int childCount = childCountObj.intValue();
if (parentChild != null) {
parentChild.setNextLevelChildrenCount(childCount);
}
}
}
}
}
公共列表loadStuff(Long year、Long prodId、Long listingId、String letter)抛出异常{
Session Session=HibernateUtil.getSession(HibernateUtil.keys[sessionId]);
StringBuffer strQuery=新建StringBuffer();
if(year==null | | prodId==null | | listingId==null)返回null
logger.debug("prodCode = " + prodId);
logger.debug("year = " + year);
strQuery.append("select pl, (select count(*) from ProductListing pppl where pppl.listingId = :listingid ");
strQuery.append(" and pppl.responseYear = :year and pppl.parentProductId = pl.productId) as CHILD_COUNT ");
strQuery.append(" from ProductListing pl ");
strQuery.append(" where pl.parentProductId = :prodid ");
strQuery.append(" and pl.responseYear = :year ");
strQuery.append(" and pl.listingId = :listingid ");
strQuery.append(" and (exists(select 0 from ProductListingMain plm, PdMain pm ");
strQuery.append(" where plm.productListingId = pl.id ");
strQuery.append(" and pm.currentVersionId = plm.versionId ");
strQuery.append(" and pm.responded = 'Y' ");
strQuery.append(" and pm.deleteFlag = 'N' ");
strQuery.append(" and pm.onlineFlag = 'Y') ");
strQuery.append(" or exists(select 0 from ProductListing ppl ");
strQuery.append(" where ppl.listingId = :listingid ");
strQuery.append(" and ppl.responseYear = :year ");
strQuery.append(" and ppl.parentProductId = pl.productId)) ");
//todo iclude the param letter in the query ... please test it before implementing
if (letter != null) strQuery.append(" and upper (pl.onlineDescription) like '" + letter + "%' ");
Query query = session.createQuery(strQuery.toString())
.setLong("year", year)
.setLong("prodid", prodId)
.setLong("listingid", listingId);
List list = query.list();
return list;
}
DAO after:
String letterClause;
if (letter != null)
letterClause = " and upper (pl.onlineDescription) like '" + letter + "%' \n";
else
letterClause = " ";
strQuery.append(
" select pl.* \n" +
" from PRODUCT_LINE p, PRODUCT_LINE_X_LISTING pll, \n" +
" PRODUCT_X_LISTING pl, CURRENT_YEAR cy, \n" +
" LISTING l \n" +
" where p.id = pll.PRODUCT_LINE_ID \n" +
" and p.prod_line_no = cy.PROD_LINE_MASTER \n" +
" and pl.RESPONSE_YEAR = cy.ONLINE_YEAR \n" +
" and pl.LISTING_ID = cy.LISTING_ID \n" +
" and pll.LISTING_ID = l.id \n" +
" and cy.LISTING_ID = l.id \n" +
" and pll.YEAR = cy.ONLINE_YEAR \n" +
" and p.Id = pll.product_line_id \n" +
" and pl.PARENT_PRODUCT_ID = " + prodId +
" and pl.LISTING_ID = " + listingId +
" and exists \n" +
" (select 'x' \n" +
" from pd_product_listing_mv mv \n" +
" where mv.listing_id = pl.listing_id \n" +
" and mv.id = pl.id) \n" +
letterClause +
" order by upper(pl.ONLINE_DESCRIPTION) ");
Query query = session.createSQLQuery(strQuery.toString())
// return all columns in the ProductListing table, i.e. the entire class
.addEntity("pl", com.acme.run.model.directories.ProductListing.class);
List list = query.list();
return list;
}
很抱歉,这不是更好的格式。这是我的第一篇文章,将您的查询从“createquery”更改为“createsqlquery”似乎导致Hibrate返回ProductListing对象列表而不是列表
如果不看ProductDAO,就很难判断它是旧版本还是新版本。您只选择了
pl.*
,并且使用了addEntity(“pl”,ProductListing.class)
,因此返回的列表是类型为ProductListing
的对象。旧查询也选择了CHILD\u COUNT
,但现在不是了。我猜您在新查询中忘记了COUNT值。显示ProductDAO界面。查询在哪里?实际上,整个loadStuff()
方法。如果您对问题的答案感到满意(这是最好的答案,答案解决了问题),请将答案标记为“已接受”。