Assuming you have mysql installed in c:\mysql and you have a mysql user account name of reddymade, open a command tool, the session should look something like this:
c:> cd \myapp\loader
c:\myapp\loader> c:\mysql\bin\mysql -u reddymade -p
Enter password: ******
mysql> use mydatabase
Database changed
mysql> source db_tables_01.sql
<output from your script>
mysql> exit
Bye
c:\myapp\loader>
If you haven't set up an account with a password, try running mysql without the "-u reddymade -p" part, it should let you right in as the default user with no password.
If you have phpmyadmin installed, open it up in a browser (usually http://localhost/phpmyadmin/), select the database from the dropdown on the left, pick the SQL tab, and enter the location of the textfile in the lower part of the page and press Go.