Will spending time in jail going to stay permanently on my file?

I went to jail the day before yesterday for assault. I pulled a knife out to prevent my idiot step dad from hitting me. Then I called the cops to arrest my abusive step father. However, I was the one that was arrested for pulling a knife out. SOOOO. I went to spend a night in jail, but had my case dismiss . The court says I should not be in jail for what has happen and they release me afterward. It is going to be on my record?