How Can I Extract Values from a SQLite Database and Use them for a Reporting tool (Graphs, charts) for an app in XCode?

I have a question about an app that I'm coding. I am coding in objective-C & I have a reporting tool that I'm looking to use a database for. I have already hardcoded values in the code, and it works fine, but now I'm looking to take values from the database and replace them with the hardcoded values. Does anyone know how to do this?