[英]Subsonic Query (ConditionA OR ConditionB) AND ConditionC
How do I build a query in Subsonic that of this format 如何在Subsonic中构建此格式的查询
(ConditionA OR ConditionB) AND ConditionC
(ConditionA OR ConditionB)AND ConditionC
Iv tried various approaches but I cant seem to get the desired result. 我尝试了各种方法,但我似乎无法得到理想的结果。
Here is one thing i tired: 这是我厌倦的一件事:
Query q = Challenge.CreateQuery();
q.WHERE(Challenge.Columns.ChallengeeKey, playerKey)
.OR(Challenge.Columns.ChallengerKey, playerKey);
q.AND(Challenge.Columns.Complete, false);
If you use 2.2 (or 2.1) you can open up expressions: 如果你使用2.2(或2.1),你可以打开表达式:
Northwind.ProductCollection products = new Select(Northwind.Product.Schema)
.WhereExpression("categoryID").IsEqualTo(5).And("productid").IsGreaterThan(10)
.OrExpression("categoryID").IsEqualTo(2).And("productID").IsBetweenAnd(2, 5)
.ExecuteAsCollection<Northwind.ProductCollection>();
You can read a bit more here: http://blog.wekeroad.com/subsonic/subsonic-version-21-pakala-preview-the-new-query-tool/ 你可以在这里阅读更多内容: http : //blog.wekeroad.com/subsonic/subsonic-version-21-pakala-preview-the-new-query-tool/
If I'm not wrong, this is a Subsonic "feature" with OR. 如果我没错,这是带有OR的亚音速“功能”。
Refactor your query as 将您的查询重构为
(ConditionA AND ConditionC) OR (ConditionB AND ConditionC)
In this case your Subsonic query like 在这种情况下,您的Subsonic查询就像
q.WHERE(...).AND(...).OR(...).AND(...)
Edit: 编辑:
Find some interresing thing here . 在这里找一些有趣的事情。 The main idea is using the
主要的想法是使用
CloseExpression()
tag. 标签。
I'm using Subsonic 2.2, I tried a few variations on Rob's example but kept getting an exception with the message: "Need to have at least one From table specified" 我正在使用Subsonic 2.2,我在Rob的例子中尝试了一些变化但是仍然得到一条例外消息:“需要至少指定一个From表”
In the end this achieved the desired result: 最终,这达到了预期的效果:
Challenge challenge = new Select().From(Challenge.Schema)
.WhereExpression(Challenge.Columns.ChallengerKey).IsEqualTo(playerKey)
.Or(Challenge.Columns.ChallengerKey).IsGreaterThan(playerKey)
.AndExpression(Challenge.Columns.Complete).IsEqualTo(false)
.ExecuteSingle<Challenge>();
If you already use SubSonic3, with a linq query this is quite easy: 如果你已经使用了带有linq查询的SubSonic3,这很容易:
var result = from c in db.Challenges
where (c.ChallengeeKey == playerKey || c.ChallengerKey == playerKey)
&& c.Complete == false
select c;
with the query tool (as mentioned by others) OrExpression / CloseExpression is the right way to generate the right query for your. 使用查询工具(如其他人所述)OrExpression / CloseExpression是为您生成正确查询的正确方法。
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