Convert Char to numeric

I have attached a very simple code snippet using Perl. However, the concept in most languages is similar.
First, convert the field to numeric like this Perl builtin function, which will result in ONLY numbers, no commas, no decimal points, no spaces, just 0-9
$Numbfield =~ s/\D+//g;
If you need to have decimal points and negative signs, then perl has a substitution such as:
$Numbfield =~ s/[0-9\.\,\-]//g;
The backslashes in perl are used to escape the value so that a "," is meant to be a "," and not a field delimiter, etc.

Since you did not specify what platform, language, or database, I utilized Perl which is cross platform.

#!/usr/bin/perl -w
my $Textfield = qq[128,074];;
my $Numbfield;
my $Answer;
my $Multiplier = '.015';
$Numbfield = $Textfield;
print qq[numbfield is $Numbfield\n];
$Numbfield =~ s/\D+//g;
print qq[numbfiled num is $Numbfield\n];
print qq[multi is $Multiplier\n];
$Answer = $Numbfield * $Multiplier;
 
print qq[answer is  $Answer\n];

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Sorry, missed your "Stored Procedure" statement.
A simple simple solution is to perform a function on that data WHEN it is stored into the database and store the ACTUAL value in both the Varchar and an INT field, if the varchar field is required.
Sure it is not ultra dramatic, but it would solve the problem in a quick and inexpensive timely manner.
Take a look at processing that value WHEN it is acquired rather than AFTER.

What is the soulution you "found" and how is it different from something presented here?