Android test

This is my first post...I own a contract warehousing company (3PL), we run a warehouse management system that stores inventory (codes, descriptions etc...) against locations (the WMS app sits on an SQL DB)The locations all have barcode labels. I want an application on my Android (Google phone) that can scan a location talk to the SQL db and return the product code(s) and qty(s). It only needs to work within my network. I'd like to own the source code and understand how it works. I'd like to be able to ask questions about the code and be guided as to how to connect and retrieve the data from the db. I want to be able to understand how the code works. I'm an enthusiastic hack who can do little bits of this and will probably drive you mad with dumb questions, I'm likely to change the scope (e.g. ask for something I can use on my desktop to play with the application). I'm happy to pay for time. If this experiment woks I want to explore other applications including a sales force automation solution.