Suk*_*oft 5 java sqlite android ormlite
我在我的 Android 应用程序中使用 ORMLite,它使用数据库来创建/更新/删除对象。我有以下表结构:
餐酒
我在做什么(只有关键部分):
In Words:我想显示所有 Wines,其中某些字段与用户输入匹配,但尊重与常量相关的 wine-type。
准备连接查询生成器:
queryBuilderWinery.where().like("name", "%Value%");
queryBuilderCountry.where().like("name", "%Value%");
queryBuilderWine
.join(queryBuilderWinery)
.join(queryBuilderCountry)
.where().like("name", "%Value%")
.or().like("purchasePlace", "%Value%").and().eq("wine_type_id", 1)
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生产:
FROM wine
INNER JOIN winery
ON wine.winery_id = winery.id
INNER JOIN country
ON wine.country_id = country.id
WHERE ((wine.name LIKE '%in%' OR wine.comment2 LIKE '%in%') AND wine.wine_type_id = 1)
OR (winery.winery_name LIKE '%in%')
OR (country.country_name LIKE '%in%')
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需要的 where 子句:
WHERE (wine.comment like '%Value%' OR
wine.purchasePlace like '%Value%' OR
winery.name like '%Value%' OR
country.name like '%Value%')
AND wine.wine_type_id = 1
or
WHERE wine.wine_type_id = 1
AND (wine.comment like '%Value%' OR
wine.purchasePlace like '%Value%' OR
winery.name like '%Value%' OR
country.name like '%Value%')
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我的问题是,这能做到吗?我已经阅读了关于此的文档,我知道可以使用 RPN(反向波兰表示法)或创建带有组的 where 子句,但我不确定如何正确地对 where 子句进行分组,因为所有连接都将有一个 OR 子句作为好吧,我需要将 AND 子句分开分组。如果我使用 Where 分组,这是否也会影响连接条件?
任何帮助表示赞赏。
更新: 我尝试了一个原始的 Where 子句,但这里有同样的问题,我无法想象一种方法,我可以将 WhereClause 分组到多个表上......
WineDAO wineDAO = new DatabaseHelperProvider().get(this).getWineDAO();
CountryDAO countryDAO = new DatabaseHelperProvider().get(this).getCountryDAO();
WineryDAO wineryDAO = new DatabaseHelperProvider().get(this).getWineryDAO();
QueryBuilder<Wine, Long> wineQueryBuilder = wineDAO.queryBuilder();
wineQueryBuilder = wineQueryBuilder.join(countryDAO.queryBuilder()).join(wineryDAO.queryBuilder());
Where<Wine, Long> where = wineQueryBuilder.where().raw("(winery.name = ? OR country.name = ?) AND wine_type_id = ?",
new SelectArg("winery.name", "in"),
new SelectArg("country.name", "in"),
new SelectArg("wine_type_id", 1));
String prepStatement = wineQueryBuilder.prepareStatementString();
List<Wine> query = where.query();
int i = query.size();
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这不起作用,因为该列winery.name显然不包含在表中wine......
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