你如何传递Nhibernate HQL中’in’子句的列表？
例如
// data input from the user interface,not known at compile time
object[] productIds = {1,17,36,... };
string hqlQuery = @"
from Product as prod
where prod.Id in ( ? )";
HqlBasedQuery query = new HqlBasedQuery(typeof(Product),hqlQuery,productIds)
ActiveRecordMediator.ExecuteQuery(query);
现在,这不会起作用,就像我希望的那样！我真的坚持做这样的事情：
// data input from the user interface,... };
string hqlQuery = @"
from Product as prod
where prod.Id in ( {0} )";
// build string array of the right number of '?' characters
string[] paramStringArray = new String('?',productIds.Length).tocharArray().Select(item => item.ToString()).ToArray();
// join to make '?,?,?'
string parameterString = string.Join(",",paramStringArray);
hqlQuery = string.Format(hqlQuery,parameterString);
HqlBasedQuery query = new HqlBasedQuery(typeof(Product),productIds)
ActiveRecordMediator.ExecuteQuery(query);
那只是丑陋而且我试图让它尽可能不丑陋.如果有人有一个很好的方法来完成这个,请告诉我.
另外我看到杰夫在sql上问了一个关于如何做到这一点的类似问题：Parameterize an SQL IN clause
这基本上是同样的问题我只想知道如何从HQL中做到这一点.这就是为什么我让这些头衔如此相似.
解决方法
使用SetParameterList().
Code snippet from billsternberger.net:
ArrayList stateslist = new ArrayList();
stateslist.Add("TX");
stateslist.Add("VA");
string hql = String.Format("FROM Contact c where State in (:states)");
SimpleQuery<Contact> q = new SimpleQuery<Contact>(hql);
q.SetParameterList("states",stateslist);
Contact[] result = q.Execute();
