调用存储过程

[c++]代码库

using namespace System;
using namespace System::Data;
using namespace System::Data::SqlClient;

void main()
{
    SqlConnection myConnection = nullptr;
    
    try
    {
        myConnection = gcnew SqlConnection("Data Source=localhost;Database=UltraMax; UID=sa; PWD=");        
        myConnection->Open();
        
        SqlCommand myCommand = gcnew SqlCommand("GetMusicByGenre",myConnection);
        myCommand->CommandType = CommandType::StoredProcedure;
        
        SqlCommandBuilder::DeriveParameters(myCommand);

        for ( int i = 0; i < myCommand->Parameters->Count; i++ )
            Console::WriteLine("Name={0}; Type={1}; Direction={2}",
                myCommand->Parameters[i]->ParameterName,
                myCommand->Parameters[i]->DbType,
                myCommand->Parameters[i]->Direction);
        
        myCommand->Parameters->Clear();
        myCommand->Parameters->Add("@Genre", SqlDbType::Char);
        myCommand->Parameters["@Genre"]->Value = "Classical";

        SqlParameter returnValue = gcnew SqlParameter("RETURN_VALUE",SqlDbType::Int);
        returnValue->Direction = ParameterDirection::ReturnValue;
        myCommand->Parameters->Add(returnValue);
        
        myCommand->ExecuteNonQuery();

        Console::WriteLine("Count = {0}",myCommand->Parameters["RETURN_VALUE"]->Value);
    }
    catch(Exception e)
    {
        Console::WriteLine(e->Message);
    }
    finally
    {
        myConnection->Close();
    }
}