valueattribute.cs

smark.data是基于C#开发的轻量级数据访问组件。 提供以下功能封： 1）提供了跨数据库类型操作能力 2）基于程线存储的数据访问上下文对象

using System;
using System.Collections.Generic;
using System.Text;

namespace Smark.Data.Mappings
{
    [AttributeUsage(AttributeTargets.Property)]
    public abstract class ValueAttribute:Attribute
    {
        public ValueAttribute(bool afterupdate)
        {
            AfterByUpdate = afterupdate;   
        }
        public bool AfterByUpdate
        {
            get;
            set;
        }
        public virtual void Executing(IConnectinContext cc,object data,PropertyMapper pm,string table)
        {
        }
        public virtual void Executed(IConnectinContext cc, object data, PropertyMapper pm, string table)
        {
        }
    }
    [AttributeUsage(AttributeTargets.Property)]
    public class IDENTITY : ValueAttribute
    {
        public IDENTITY()
            : base(true)
        {
        }
        public override void Executed(IConnectinContext cc, object data, PropertyMapper pm, string table)
        {
            Command cmd = new Command("select @@IDENTITY ");
            object value = cc.ExecuteScalar(cmd);
            pm.Handler.Set(data,Convert.ChangeType( value,pm.Handler.Property.PropertyType));
        }
    }
}