c# – 使用HqlBasedQuery参数化HQL IN子句？

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();