我的数据库安全性如何失败？

In a couple of my tables in my SQL Server 2005 database all of my data has been erased. Is there anyway to get a log in SQL Server of all the statements that have ran in the past day? I am trying to find out if someone did this on accident, there is a vulnerability in my web app, or the actual DB has been compromised. In a couple of my tables in my SQL Server 2005