我正在使用 ormlite 版本 4.46 当我运行原始查询时我能够获得所需的结果,但是当我在 ormlite 中尝试它时结果为空,有人可以解释我在哪里犯了错误。
片段:
String query=
"SELECT Products.* FROM "+DBConst.TABLE_PRODUCTS
+" INNER JOIN "+DBConst.TABLE_OFFERS_MAPPING
+" ON Products."+DBConst.PROD_ID+" = OffersMapping."+DBConst.OFFERS_PRODUCT_ID
+" WHERE "+DBConst.OFFERS_OFFER_ID+ " = "+offerId+
" GROUP BY "+DBConst.PROD_PARENT_PRODVAR_ID;
GenericRawResults<Product> rawResults = productDao.queryRaw(query, productDao.getRawRowMapper());
//produces this query:SELECT Products.* FROM Products INNER JOIN OffersMapping ON Products._id = OffersMapping.product_id WHERE offer_id = 141 GROUP BY variant_id
List<Product> prodList = rawResults.getResults();
rawResults.close();
给了我想要的结果....现在到 ormlite
Dao<Product, String> productDao = helper.getProductDao();
Dao<OfferMapping, String> offerMappingDao = helper.getOfferMappingDao();
try {
QueryBuilder<Product, String> productQb = productDao.queryBuilder();
QueryBuilder<OfferMapping, String> offerQb = offerMappingDao.queryBuilder();
//to sort the offer id accordingly
offerQb.where().eq(DBConst.OFFERS_OFFER_ID, offerId);
productQb.where().eq(DBConst.PROD_ID, new ColumnArg(DBConst.OFFERS_PRODUCT_ID));
productQb.join(offerQb);
productQb.groupBy(DBConst.PROD_PARENT_PRODVAR_ID);
Constants.showLog("Query", "Query is "+productQb.query());//gets null here
List<Product> prodList = productQb.query();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
不知道我在哪里犯错...