Question

不知何故，我无法在插入新记录时找到如何正确传递数据，我将第一列值发送回WCF。一切正常，但我无法传递数据。我错过了什么？

CLR触发调用WCF：

public partial class Triggers
{

    public static EndpointAddress endpoint =  new EndpointAddress(new Uri("http://localhost:8000/services/myservice"));
    public static WSHttpBinding httpBinding = new WSHttpBinding();
    public static ServiceClient.ServiceReference1.ServiceContractClient myclient = new ServiceClient.ServiceReference1.ServiceContractClient(httpBinding, endpoint);
    public delegate void MyDelagate(String crudType);
    [SqlProcedure()]
    public static void SendData(String crudType)
    {
        myclient.UpdateOccured();//i was trying to pass the crudType value here 

    }

    [Microsoft.SqlServer.Server.SqlTrigger(Name = "WCFTrigger", Target = "tbCR", Event = "FOR INSERT")]
    public static void Trigger1()
    {

        SqlCommand cmd;
        SqlTriggerContext myContext = SqlContext.TriggerContext;
        SqlPipe pipe = SqlContext.Pipe;
        SqlDataReader reader;

        if(myContext.TriggerAction== TriggerAction.Insert)
        {
            using (SqlConnection conn = new SqlConnection(@"context connection=true"))
            {
                conn.Open();
                cmd = new SqlCommand(@"SELECT * FROM tbCR", conn);
                reader = cmd.ExecuteReader();
                reader.Read();

                //get the insert value's here
                string Name;
                Name = (string)reader[1];
                reader.Dispose();


                switch (myContext.TriggerAction)
                {
                    case TriggerAction.Update:

                         SendData(Name);

                        break;

                    case TriggerAction.Insert:

                        SendData(Name);
                    break;
                }
            }
        }

    }
}

我的服务合同：

namespace SampleService
{
    class MyService : IServiceContract
    {
        public void UpdateOccured()
        {
            Console.WriteLine("Update Occured");
        }

        public void InsertOccured(string Name)
        {
            Console.WriteLine("Insert Occured",Name);
        }

    }
}

接口：

namespace SampleService
{
    [ServiceContract]
    interface IServiceContract
    {
        [OperationContract]
        void UpdateOccured();
        [OperationContract]
        void InsertOccured(string Name);
    }
}

Answer 1

您应该从实际表的INSERTED insertead中选择，即

cmd = new SqlCommand(@"SELECT * FROM INSERTED", conn);

此外，您应该明确命名所需的列，而不是使用*。

INSERTED和DELETED以及SQL Server创建的内存驻留表表。

More details

删除的表存储DELETE期间受影响的行的副本   UPDATE语句。在执行DELETE或UPDATE期间   语句，行从触发器表中删除并传输到   删除的表。删除的表和触发表通常   没有共同的行。

insert表在INSERT期间存储受影响行的副本   和UPDATE语句。在插入或更新事务期间，新的   行被添加到插入的表和触发器表中。该   inserted表中的行是触发器中新行的副本   表

更新事务类似于删除操作后跟一个   插入操作;先将旧行复制到已删除的表中，   然后将新行复制到触发器表和   插表。

将值从CLR触发器传递到WCF

1 个答案: