Website Security against sql injection

I run a small social networking site. It has been attacked with sql injection. Everytime database gets cleaned, within 24 hours it gets attacked again. I need an expert who knows about securing sites against these attacks. To my knowledge, the attacks are happening through the sites text boxes. Site must be totally secure to prevent this from happening. Job needs to be completed within 1 day. WILL ONLY PAY ONCE I KNOW SITE HAS BEEN MADE SECURE