title: Barcode field length
body: <p>I'm writing some attendance software.  Each member will have an ID card with a barcode which they will use to sign in to events.  How long should the barcode field be in my database?  I'd like to accept Code 39 and Code 128 barcodes.  I know these are variable length codes, so what should I set the max length to?</p>
  
  <p>Thanks!</p>
  
  <p>EDIT:  My clients will be using a variety of third-party barcode printing tools.</p>