c ++更新Access数据库

Question

我的代码遇到问题。我想更新访问数据库中的信息，但它会在行conn-＆gt;打开时不断发现错误，并且不会提供任何错误信息。

cout << "Please enter file name... ";
cin >> fileName;
String^ name = gcnew String(fileName.c_str());
String^ sqlstr = "UPDATE [Saved] SET Name = '"+name+"' WHERE ID = 1";   
OleDbConnection^ conn = nullptr;
OleDbCommand^ cmd = nullptr;

try {
    //Create and open database connection.
    conn = gcnew OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = F:\WWTMrWolf_Prototype_Demo\Debug\WTMrWolf_P_D_Database.mdb");
    conn->Open();
    cmd = gcnew OleDbCommand(sqlstr, conn);
    OleDbDataReader^ reader = cmd->ExecuteReader(System::Data::CommandBehavior::CloseConnection);
    while (reader->Read())
    {
        printf("File ") +reader["Name"]->ToString()+ (" created");
    }

}
catch (Exception^ ex)
{
    printf("Error: ") + ex->ToString();
    system("Pause");
    exit(0);
}
return fileName;

输出：＆＃34;错误：按任意键继续...＆＃34;