How to build a BOM app with apex?

Hi ,
From long time i am wondering to design and build a Bill of Material application(or module) for my apex application, it is lacking that kind of feature and we desperately need it.
But I just don't know how to get started, how to design the database objects, and how to make it shine with apex,
we are a small manufacture of mechanical parts/products.
Any idea?
Thanks.
Peter

Then you're going to need to learn Objective-C, the concepts of object oriented programming, and a whole ton more.  Xcode is just a tool used to write and manage a software project.
To learn to program, you must first get the compiler which you use to write and test programs.  Thus you need to get a copy of Xcode from Apple's developer site.
          * Find a book on xcode.  Be sure to get a book that covers the current version of xcode.  But before getting far into xcode, you must ...
Next, you must learn the programming language used to create mac and iOS programs.
          * Read the book "Programming in Objective-C", By Stephen G. Kochan
          * Find a book on xcode.  Be sure to get a book that covers the current version of xcode.
Next learn about Cocoa, the graphical environment and other support libraries that you need for OSX and iOS.
          * There are many books on this, check ratings and evaluations at Amazon books. 
Once you have the basics, you really need to learn the technicals of programming, like design patterns, algorithms, data structures, concurrent processes.
          * University or college courses
          * Textbooks used in these courses, if you want to do it on your own.
Although computer science majors at the college level take 4 years to learn their trade, the first three semesters cover the important basic topics of programming.  If you can take a course in Programming 1 at a local school that will get you started.  You can certainly do it on your own, but programming can be a frustrating trip and working with others is very helpful.

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