Hi Muhbassir,
I’m sorry that something went wrong after your database operations. The following simple rule always applies to such interventions, regardless of using a builder or not:
Make a database backup beforehand! Always! It’s only two or three clicks away
As I’m not a mysql expert, I can’t tell you exactly how you can undo your operations (that’s usually what the backup is for).
I always use the search/replace script mentioned here, with which I have never had any problems. However, I always make a backup beforehand: