如何使用Linq to NHibernate执行执行时间查询

好的,这里有两种方法。最简单的可能不涉及NHibernate,因为您使用的是SQL Server。。。您可以在表上创建一个INSERT触发器,如下所示:

CREATE TRIGGER tgINSCategory ON Category INSTEAD OF INSERT
AS 
BEGIN
    SET NOCOUNT ON

    INSERT INTO Category (SiteID, Name, SortOrder)
    SELECT SiteID, Name, 
        ISNULL((SELECT MAX(c.SortOrder)
                FROM Category c INNER JOIN INSERTED i ON c.SiteID = i.SiteID), 0) + 1   
    FROM INSERTED
END

在第一个场景中,您只需NHibernate将SortOrder列映射为只读(只需在fluent NHibernate类map SortOrder属性上添加一个.ReadOnly()。

using System;
using System.Reflection;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate;

    public class InsertDefaults : EmptyInterceptor {
        private const string CREATED_BY = "CreatedById";

        private Hashtable GetInsertLoggablePropertyIndexes(string[] Properties) {
            Hashtable result = new Hashtable();
            for (int i = 0; i < Properties.Length; i++) {
                if (Properties[i] == CREATED_BY) {
                    result.Add(CREATED_BY, i);
                    break;
                } 
            }
            return result;
        }

        public override bool OnSave(object entity, object id, object[] state, string[] propertyNames, NHibernate.Type.IType[] types) {
            if (entity is IInsertLoggable) {  
                Hashtable indexes = GetInsertLoggablePropertyIndexes(propertyNames);
                state[(int)indexes[CREATED_BY]] = currentUser;
                PropertyInfo createdByProp = entity.GetType().GetProperty(CREATED_BY);
                if (createdByProp != null)
                    createdByProp.SetValue(entity, currentUser, null);
            }
            return base.OnSave(entity, id, state, propertyNames, types);
        }
    }

在我看来,这种典型的触发器操作应该存在于数据库中,我会选择第一种方法。。。