c# - Fluent NHibernate - 来自 Session.QueryOver 中的属性的列名

Question

我有一个 Session.QueryOver，我需要维护，我想删除列名的神奇字符串，例如：

---

return Session.QueryOver<T>()
    .SelectList(list => list
        .Select(Projections.SqlGroupProjection(
            "CANDIES(" + MagicalStringForColumnName +") As [Candies]",
            "CANDIES(" + MagicalStringForColumnName + ")",
            new[] { "Candies" },
            new IType[] { NHibernateUtil.Int32 }))

我希望它像：

return Session.QueryOver<T>()
    .SelectList(list => list
        .Select(Projections.SqlGroupProjection(
            "CANDIES(" + Session.GetColumnNameFromMappedProperty(propInfo.Name) +") As [Candies]",
            "CANDIES(" + Session.GetColumnNameFromMappedProperty(propInfo.Name) + ")",
            new[] { "Candies" },
            new IType[] { NHibernateUtil.Int32 }))

Answer 1

事实证明，通过使用别名和 SqlFunction，可以使用表达式，而不是神奇的字符串。

        object a = null;

        return Session.QueryOver<T>()
               .SelectList(l =>
                   l.Select(
                   Projections.GroupProperty(
                   Projections.SqlFunction("CANDIES", NHibernateUtil.Int32, Projections.Property(expression))
                   )).WithAlias(() => a)