使用NHibernate调用参数化存储过程

Question

I want to call a stored procedure that return ClassID and Student id

My XML mapping is

<sql-query name="GetClassRevenuebyStudent_Sea">
    <return-scalar column="totalRevenew" type="System.String" />
    exec GetClassRevenue_Sea ClassID, StudentID
</sql-query>

And my stored procedure calling code is

public static double Student_ShowRevenue(string classid, string studentid)
{
    ISession session = NHibernateHelper.GetSession();
    ITransaction trans = session.BeginTransaction();
    IQuery query = (IQuery)session.GetNamedQuery("GetClassRevenuebyStudent_Sea");
    query.SetParameter("ClassID", classid);
    query.SetParameter("StudentID", studentid);

    return Convert.ToDouble(query.List()[0]); 
}

But when I run the application it gives the exception on the line

return Convert.ToDouble(query.List()[0])

that all parameters are not set.

Answer 1

You need to place a colon in front of your ClassId and StudentId properties in your mapping to indicate that they are placeholders for the parameters you are going to set:

<sql-query name="GetClassRevenuebyStudent_Sea">
    <return-scalar column="totalRevenew" type="System.String" />
    exec GetClassRevenue_Sea :ClassID, :StudentID <!-- notice the colon (:) -->
</sql-query>

then you can call the named query from your code,

IQuery query = session.GetNamedQuery("GetClassRevenuebyStudent_Sea")
   .SetParameter("ClassID", classid)
   .SetParameter("StudentID", studentid);