如何使用asp.net c＃.net在sql server 2008中的日期列中存储空值

问题描述

Iam使用asp.net4.o和c＃一起使用sql server 2008





我有一名表员工，其列如下

employeeid int

avizoTime datetime



expirationTime datetime



我必须存储日期时间栏的空值



当我使用以下代码iam我收到错误时你可以更正代码

Iam using asp.net4.o with c# with sql server 2008


iam having table employee with column as follow
employeeid int
avizoTime datetime

expirationTime datetime

ihave to store null value for date time column

when iam using the below code iam iam getting error can you correct the code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.SqlTypes;
/// <summary>
/// Summary description for StatusChange
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
public class StatusChange : System.Web.Services.WebService {
public StatusChange () {
//Uncomment the following line if using designed components 
//InitializeComponent(); 
}
string StrConnection = ConfigurationManager.ConnectionStrings["SqlConn"].ConnectionString;
System.Data.SqlTypes.SqlDateTime sqldatenul;
//SqlDateTime sqldatenul;
[WebMethod]
public string packStatus(int empid, DateTime expirationTime, DateTime avizoTime)
{
sqldatenul = SqlDateTime.Null;
string strResult = " Status Failed ..";
SqlConnection MyCon = new SqlConnection(StrConnection);

SqlCommand MyCommand = new SqlCommand("ProPackStatus", MyCon);
MyCommand.CommandType = CommandType.StoredProcedure;
MyCommand.Parameters.AddWithValue("@employeeid", empid));

if(expirationTime==null)
{
MyCommand.Parameters.AddWithValue("@expirationTime",sqldatenul);
}
else
{
MyCommand.Parameters.AddWithValue("@expirationTime",(expirationTime).ToUniversalTime());
}
if(avizoTime==null)
{
MyCommand.Parameters.AddWithValue("@avizoTime",sqldatenul);
}
else
{
MyCommand.Parameters.AddWithValue("@avizoTime",(avizoTime).ToUniversalTime());
}
try 
{
MyCon.Open();
if (MyCommand.ExecuteNonQuery() != 0)
{
　
strResult = "Status Changed";
}
strResult = "Status Changed";
}
catch(Exception ex)
{
strResult = ex.ToString();
}
MyCon.Close();
return strResult;
}
}

推荐答案

if(avizoTime==null)
{
MyCommand.Parameters.AddWithValue("@avizoTime",DBNull.Value);
}
else
{
MyCommand.Parameters.AddWithValue("@avizoTime",(avizoTime).ToUniversalTime());
}

@avizoTime datetime = null

当你运行你的查询

空值自动更新

when you run your query
null value automatically update

MyCommand.Parameters.AddWithValue("@expirationTime",SQLDateTime.Null);

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