存储过程中的OdbcCommand-“未提供参数"输出参数错误 [英] OdbcCommand on Stored Procedure - "Parameter not supplied" error on Output parameter

问题描述

我正在尝试执行存储过程(通过ODBC驱动程序针对SQL Server 2005)，并且收到以下错误:

I'm trying to execute a stored procedure (against SQL Server 2005 through the ODBC driver) and I recieve the following error:

过程或函数'GetNodeID'需要未提供的参数'@ID'.

Procedure or Function 'GetNodeID' expects parameter '@ID', which was not supplied.

@ID是我的过程的OUTPUT参数，在存储过程中指定了一个输入@machine并将其设置为null:

@ID is the OUTPUT parameter for my procedure, there is an input @machine which is specified and is set to null in the stored procedure:

ALTER PROCEDURE [dbo].[GetNodeID] 
@machine nvarchar(32) = null,
@ID int OUTPUT
AS
BEGIN
SET NOCOUNT ON;

IF EXISTS(SELECT * FROM Nodes WHERE NodeName=@machine)
BEGIN
    SELECT @ID = (SELECT NodeID FROM Nodes WHERE NodeName=@machine)
END
ELSE
BEGIN
    INSERT INTO Nodes (NodeName) VALUES (@machine)
    SELECT @ID = (SELECT NodeID FROM Nodes WHERE NodeName=@machine)
END
END

以下是我用来设置参数和调用过程的代码:

The following is the code I'm using to set the parameters and call the procedure:

        OdbcCommand Cmd = new OdbcCommand("GetNodeID", _Connection);
        Cmd.CommandType = CommandType.StoredProcedure;

        Cmd.Parameters.Add("@machine", OdbcType.NVarChar);
        Cmd.Parameters["@machine"].Value = Environment.MachineName.ToLower();

        Cmd.Parameters.Add("@ID", OdbcType.Int);
        Cmd.Parameters["@ID"].Direction = ParameterDirection.Output;

        Cmd.ExecuteNonQuery();
        _NodeID = (int)Cmd.Parameters["@Count"].Value;

我也尝试使用Cmd.ExecuteScalar，但没有成功.如果我在执行命令之前中断了，我可以看到@machine有一个值.

I've also tried using Cmd.ExecuteScalar with no success. If I break before I execute the command, I can see that @machine has a value.

如果我直接从Management Studio执行该过程，则它可以正常工作.

If I execute the procedure directly from Management Studio, it works correctly.

有什么想法吗?谢谢

推荐答案

尝试替换:

OdbcCommand Cmd = new OdbcCommand("GetNodeID", _Connection);
Cmd.CommandType = CommandType.StoredProcedure;

使用:

OdbcCommand Cmd = new OdbcCommand("{call GetNodeID(?,?)}", _Connection);

更多信息:

http://support.microsoft.com/kb/310130

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