One thing that should be clear is that you do not need to purchase Reader Extensions to use Barcode Forms technology. Take a look at the 2 articles at the bottom of
http://www.adobe.com/products/server/barcodedpaperforms/ they talk specifically about this issue.
However, if you do not get RE with your Barcoded Forms license your end users will not be able to save the form off-line or submit electronically (other than data-only by email). They will be able to fill-in and print the forms only.
By your post it sounds like you are getting Adobe LiveCycle Barcoded Forms and you have also licensed the decoder.
The decoder itself works with a watched folder mechanism. So what you can do is create a small Java program that simply waits for decoded output from the output directory of the decoder and then populates your MySQL database. The code should be around a day to implement.
Here is the link to the deployment article that talks about the RE requirement:
http://www.adobe.com/products/server/barcodedpaperforms/pdfs/deploying_2d_barcodedpdfforms.pdfYour Java will basically do something like this (very incomplete sample)
public class theThred extends Thread {
.....
.....
public void start() {
....
}
public void run() {
while (true) {
checkTheDirectoryCodeHere();
gotSomethingWriteItHere();
sleep(foreSomeNumberOfMilliseconds);
}
}
public void checkTheDirectoryCodeHere() {
.....
Directory dir = new Directory("thePath");
.....
}
}