Anyone have a good reference guide for GQL (query language for google appengine datastore)?
I find the reference guide on the google appengine site very limited with examples
+1
A:
The doc is limited because GQL is a very, very simple query language, intended to provided an SQL-like interface on top of protocol buffers. There's not a lot of complexity to it.
The most instructive thing may be to read the GQL source. It's online here. Note in particular how GQL is parsed with a simple, hand-rolled top-down parser.
Dave W. Smith
2010-06-19 07:18:59