A collection of static function filled classes designed to clean up code in iOS applications interacting with SQLite databases and the file system
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 * Copyright 2010 Dave Finster
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

Though my iPhone development cycles, I've produced a fair amount of code 
that I'm not overly proud of (as most developers probably do at some point).
I tend to interact with SQLite a fair bit as I like to customise the 
behaviour and performance my saved/sync'd objects between SQLite and my code.
I also tend to be particular about my RAM footprint when dealing with images, 
thus relying heavily on file system storage of both downloaded and captured 
(with the camera/from photo library) images. I wrote these snippets of code 
to cut down the amount of replicated SQLite code and centralise anything 
related to addressing files on disk.

1. FileHelper
	Basically stops you from having to store/manually extract the path to 
the documents and temporary directory and compile file path strings 
yourself. Also has the facility to save an image directly to the documents 
folder simply by specifying the UIImage object. It returns a (hopefully) 
unique file name based on the time interval since 1970 and a random number.

2. SQLiteHelper
	Ensures that there is only one SQLite connection open to your local 
database throughout the app, with all internal methods also referencing 
this singleton. Provides convenience methods for checking if tables 
or certain values exist in the database, preparing queries for execution, 
extracting values from successful queries, conversion between column 
names and column indices and a function which performs a SELECT query, 
returning all the results in a easy to use NSDictionary