determine schema field type in SQLite, CSV, or Excel

I am working on an Cocoa project using SQL databases, or CSV/Excel files as the input.

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Right now, I have hard-coded the SQL schema for the SQLie files I am importing (For example, the program would know that the first column is a STRING, second column is a INT... etc.). I am wondering if there's any C or Objective-C library or method to automatically identify the field type?

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You can query the database what it's schema is in sqlite(3)

http://www.sqlite.org/pragma.html

Search for "Pragmas to query the database schema"