Question

C＃ - ＆gt;我有一个参数化存储过程（SP），它返回一个我想调用的int，并读取我想要分配给隐藏字段的返回值。我相信我已经写了大部分内容但是我坚持最后一部分（实际上是从SP中提取返回的值。帮助将非常感激。这是我到目前为止所拥有的......

public int CheckIP()
{
    string conn = "";
    conn = ConfigurationManager.ConnectionStrings["Connection"].ToString();
    SqlConnection sqlconn = new SqlConnection(conn);
    try
    {
        sqlconn.Open();
        DataSet ds = new DataSet();
        SqlCommand objcmd = new SqlCommand("sp_CheckIP", sqlconn);
        objcmd.CommandType = CommandType.StoredProcedure;
        SqlParameter IPAddress = objcmd.Parameters.Add("@IpAddress",
            SqlDbType.VarChar);
        IPAddress.Value = 0;

        SqlDataAdapter objAdp = new SqlDataAdapter(objcmd);
        objAdp.Fill(ds);

        ????
    }
    catch (Exception ex)
    {
        Response.Write(ex.Message.ToString());
    }
    finally
    {
        sqlconn.Close();
    }
}

我的存储过程如下：

ALTER Procedure [dbo].[sp_CheckIP]
@IpAddress varchar(15),
@AllowedLogInAttempts int Output

AS
BEGIN

IF (Select Count(IPAddressID) From Emerald.dbo.IPManager 
    Where IPAddress = @IPAddress) = 1
BEGIN

Select @AllowedLogInAttempts = 
     CASE
        When Trusted = 0 and Block = 0 then '5'
        When Trusted = 1 and Block = 0 then '7'
        When Trusted = 0 and Block = 1 then '0'
        When Trusted = 1 and Block = 1 then '0'
        End 
FROM Emerald.dbo.IPManager
Where IPAddress = @IPAddress

END
ELSE 
Select 3
END

Answer 1

您需要修改您的代码，如下所示，我已经为SP添加了返回变量并返回输出值。

public int CheckIP()
{
 string conn = "";
 conn = ConfigurationManager.ConnectionStrings["Connection"].ToString();
 SqlConnection sqlconn = new SqlConnection(conn);
 try
 {
     sqlconn.Open();
     DataSet ds = new DataSet();
     SqlCommand objcmd = new SqlCommand("sp_CheckIP", sqlconn);
     objcmd.CommandType = CommandType.StoredProcedure;

     SqlParameter IPAddress = objcmd.Parameters.Add("@IpAddress", SqlDbType.VarChar);
     IPAddress.Value = 0;


     SqlParameter returnParameter = new SqlParameter("@AllowedLogInAttempts", SqlDbType.Int);
     returnParameter.Direction = ParameterDirection.Output;
     objcmd.Parameters.Add(returnParameter);

      objcmd.ExecuteNonQuery();
     int id = (int) returnParameter.Value;    

     //Now here write your logic to assign value hidden field
 }
 catch (Exception ex)
 {
     Response.Write(ex.Message.ToString());
 }
 finally
 {
     sqlconn.Close();
 }
}

Answer 2

你可以使用;

retval = objcmd.ExecuteScalar（）;

Answer 3

Select @AllowedLogInAttempts = 
     CASE
        When Trusted = 0 and Block = 0 then '5'
        When Trusted = 1 and Block = 0 then '7'
        When Trusted = 0 and Block = 1 then '0'
        When Trusted = 1 and Block = 1 then '0'
     End 
FROM Emerald.dbo.IPManager
Where IPAddress = @IPAddress

可缩短为：

Select @AllowedLogInAttempts = (Trusted * 2 + 5) * (Block ^ 1)

调用在C＃中返回值的参数化存储过程

3 个答案: