Question

我在SQL Server中有一个现有的存储过程，我需要从我的C＃代码调用并获得结果。这是SP的样子

CREATE PROCEDURE [dbo].[sp_MSnextID_DDB_NextID]
@tablesequence varchar(40)
AS
declare @next_id integer
begin transaction
update DDB_NextID
set DDB_SEQUENCE = DDB_SEQUENCE + 1
where DDB_TABLE = @tablesequence
select @next_id = DDB_SEQUENCE from DDB_NextID 
where DDB_TABLE = @tablesequence
commit transaction
RETURN @next_id

这是我的C＃代码

using (OdbcConnection connection = new OdbcConnection(GetConnectionString()))
{
   using (IDbCommand command = new OdbcCommand())
   {
      command.CommandText = "sp_MSnextID_DDB_NEXTID";
      command.CommandType = CommandType.StoredProcedure;
      IDbDataParameter parameter1 = command.CreateParameter();
      parameter1.DbType = DbType.String;
      parameter1.ParameterName = "@tablesequence";
      parameter1.Value = "ddb_dc_document";
      parameter1.Direction = ParameterDirection.Input;
      command.Parameters.Add(parameter1);

      IDbDataParameter parameter2 = command.CreateParameter();
      parameter2.DbType = DbType.Int32;
      parameter2.ParameterName = "@Return_Value";
      parameter2.Direction = ParameterDirection.ReturnValue;
      command.Parameters.Add(parameter2);
      command.Connection = connection;
      connection.Open();
      command.ExecuteNonQuery();
      IDbDataParameter o = (command.Parameters)["@Return_Value"] as IDbDataParameter;
      //Got return value from SP in o.Value
   }
}

问题是我得到了异常

[42000] [Microsoft] [SQL Native Client] [SQL Server]过程或函数'sp_MSnextID_DDB_NextID'需要参数'@tablesequence'，没有提供。

我无法解释或修复。我缺少什么？

为了找到解决方法，我尝试了不同的方法：执行以下查询，在临时表中设置数据

create table #temp  (i integer); insert into #temp exec sp_MSNextID_DDB_NEXTID @tablesequence='ddb_dc_document';select * from #temp;

在这种情况下，SP正确执行但select选择返回零行！

Answer 1

不幸的是，you can't use named parameters with OdbcCommand。 You will need to instead execute a call statement to your stored procedure.

using (OdbcConnection connection = new OdbcConnection(GetConnectionString()))
{
   using (IDbCommand command = new OdbcCommand())
   {
      command.CommandText = "{ ? = CALL sp_MSnextID_DDB_NEXTID(?) }";
      command.CommandType = CommandType.StoredProcedure;


      IDbDataParameter parameter2 = command.CreateParameter();
      parameter2.DbType = DbType.Int32;
      parameter2.ParameterName = "@Return_Value";
      parameter2.Direction = ParameterDirection.ReturnValue;
      command.Parameters.Add(parameter2);

      IDbDataParameter parameter1 = command.CreateParameter();
      parameter1.DbType = DbType.String;
      parameter1.ParameterName = "@tablesequence";
      parameter1.Value = "ddb_dc_document";
      parameter1.Direction = ParameterDirection.Input;
      command.Parameters.Add(parameter1);

      command.Connection = connection;
      connection.Open();
      command.ExecuteNonQuery();
      IDbDataParameter o = (command.Parameters)["@Return_Value"] as IDbDataParameter;
      //Got return value from SP in o.Value
   }
}

Answer 2

要使解决方法正常工作，您应该替换

RETURN @next_id

在您的程序中

SELECT @next_id

无法从C＃执行SQL存储过程

2 个答案: