Sorry, Protocol Buffers do not provide support for searching or indexing. All protobuf does is parse and serialize data structures. Drizzle is actually building database functionality *on top* of protocol buffers -- they implement their own searching and indexing, using protocol buffers to implement the base serialization.
On Fri, Jun 19, 2009 at 11:25 PM, green <enmanu...@gmail.com> wrote: > > I am interested in using protocol buffers for the following scenario: > > I have a large number of small data points I need to serialize to a > file. Once this serialization process is complete, the data will be > strictly read only, accessed by multiple threads, until I need to > create a new version of the file. The application will access the file > at startup, and while executing will need to retrieve data points > based on a given parameter. Pretty much behaves like tabular data you > would find in a database table. I need to retrieve a "row", based on a > "primary key". Yet a traditional database is not a good solution in > this situation. > > My understanding is that it's not a good idea to have large messages, > but you can have a large number of small messages within a file, and > it shouldn't be a problem. I have seen the .proto file structure and > how messages are determined. What I don't understand (maybe I missed > that part in the documentation) is how to make searches for messages > within a file. If I use the "repeated" qualifier, it will let me have > more than one message in another one, but I'll just retrieve it as a > list. I can't specify what subset of messages I want. > > Can I sort messages based on a given field? > Can I request a subset of messages by index range, or some other > criteria? > Can I "browse" through a message file, given a particular search > parameter? > Can I have some sort of Map inside the .proto definition, where I > organize elements in key - value fashion? > > Alternatively, are my assumptions of what I should be able to do with > protocol buffers wrong from the start? I assumed this kind of thing > was possible since the drizzle devs are using protocol buffers for > their database implementation. Link below. > > http://drizzle.org/wiki/Table_Proto_Definition > > Thanks in advance. > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/protobuf?hl=en -~----------~----~----~----~------~----~------~--~---
