Efficient ISNUMERIC() replacements on SQL Server?

Question

So I just spent 5 hours troubleshooting a problem which turned out to be due not only to the old unreliable ISNUMERIC but it looks like my problem only appears

Answer 1

Another option might be to write an extended stored procedure in a language such as C, make it into a DLL and make it available to SQL Server.

I don't imagine it would take too many lines of code to do, and it probably would be faster than writing a Managed Stored Procedure in .NET, because you wouldn't incur the extra overheard from loading the CLR.

Here's a tidbit of information: http://msdn.microsoft.com/en-us/library/ms175200.aspx

Here's some C++ code that might work for you:

using namespace std;

int checkNumber() {
  int number = 0;
  cin >> number;
  cin.ignore(numeric_limits::max(), '\n');

  if (!cin || cin.gcount() != 1)
    cout << "Not a number.";
  else
    cout << "Your entered: " << number;
  return 0;
}