The community database is the foundation for a set of social software applications. The primary focus is a user roster, a node roster, and a whuffie/mojo calculation and management system. The database is currently implemented in SQL tables on postgresql.
community database take two. March 2003 AdamShand, JerrittCollord, AaronBaer, DonPark, (insert your name here)
community database take three. February 2004
- tableizing for readabilty, sorry if it offends. MatthewAsham
Users Table
Description
- A record in the user table refers to an individual person.
Table Relationships
- 1...N Community
- 1...N Node
Fields
- id - numeric, primary key - Unique ID
- createdate - timestamp - record creation date
- modificationdate - timestamp - last modification date
- username - character varying(20), unique - login name
- firstname - character varying(50) - The user's first name
- lastname - character varying(100) - The user's last name
- password - character varying(8) - The user's password, in plaintext
- memberstatus - character varying(10) - An index into the memberstatus table
- phone_home - character varying(15) - Home phone number
- phone_cell - character varying(15) - Cell phone number
- url_homepage - character varying(200) - URL for a home page/info page
- url_profileimage - character varying(200) - URL for a profile image
- url_foaf - character varying(200) - URL to a FOAF description
- comments - character varying(2000) - miscellaneous comments
- certificationid - numeric - An index into an adhoc certification table
- mailto - character varying(100) - User's email address
- jabber - character varying(100) - User's jabber id (optional)
- moinlogin - character varying(24) - login to the moinmoin system (optional)
- sponsorid - numeric - Index to the user who sponsors this person
- mailingaddressid - numeric - Index into the postal address table
Table attributes - Cascade BR
Create Record BR
- Generate a Unique ID - either ask the user or generate one randomly
- Minimum fields to fill: userid
Delete Record BR
- Remove the record in the User table
- Remove records in all tables listed in the relationship table list that have the same unique id
Node Table
Description
- A wireless accesspoint at a particular location.
Table relationships
- 1...owned by..............N User
- 1...managed by............N User
- 1...upstream comes from...N Provider
- 1...has...................N Router
Fields
- id - numeric, primary key - unique ID
- createdate - ? - record creation date
- modificationdate - ? - last modification date
- name - character varying(1000) - Given name of the phone
- providerid - numeric - index into the provider table
- carrierid - numeric - index into the carrier table
- neighborhoodid - numeric - index into the neighborhood table
- bandwidthid - numeric - index into the bandwidth table
- statusid - numeric - index into the status table
- certificationid - numeric - index into the certification table
- comments - character varying(2000) - notes on the node
- latitude - character varying(200) - latitude
- longitude - character varying(200) - long
- altitude - ? - meters above sealevel
- essid - character varying(500) - essid in use (this should index into a table for multiple radios)
- channel - character varying(2) (parrt of the radio channel)
- address - character varying(200) - (this should be an index into an address table)
- city - character varying(100)
- state - character varying(100)
- zip - character varying(20)
- url_sitephoto - character varying(300) - profile shot to include in a profile page
- url_information - character varying(300) - Information about the site
- maintainer1 - character varying(20) - index into user table (change into a new table to support N photos)
- maintainer2 - character varying(20) -
- owner - character varying(20) - index into the user table
- node_geom - geometry - ?
- dhcp_ip_block - character varying(128) - IP block provided by DHCP. this would be part of the radio/interface specification.
Check constraints: BR
"$1" (srid(node_geom) = -1) BR "$2" ((geometrytype(node_geom) = 'POINT'::text) OR (node_geom IS NULL)) BR
Router table
Description
- A network router at a node location
Table relationships
- 1..has.......N Interface
Fields
- id - numeric, primary key - unique ID
- createdate - ? - record creation date
- modificationdate - ? - last modification date
- name - character varying(80) - Given name of the box or device
Interface table BR Description
- An interface = radio + antenna on a router
Table relationships
Fields
- id - numeric, primary key - unique ID
- createdate - ? - record creation date
- modificationdate - ? - last modification date
- name - character varying(10) - Interface name
- media - integer - 1=802.3 2=802.11b 3=802.11g 4=802.11a
- radio_power - integer - dBm
- radio_receive_sensitivity - integer - units?
- antenna_gain - integer - dBi
- antenna_beamwidth_horiz - integer - degrees
- antenna_beamwidth_vert - interger - degrees
- antenna_facing_horiz - integer - direction antenna is facing, degrees from north
- antenna_facing_vert - integer - direction antenna is facing, degrees from north
Addresses Table
Description Street address of users, nodes, etc.
Table Relationships
Fields BR
- id - numeric, primary key - unique ID
- createdate - ? - record creation date
- modificationdate - ? - last modification date
- address1 - character varying(100) - Street address line 1
- address2 - character varying(100) - Street address line 2
- city - character varying (50) - City
- state - character varying (20) - State or Province
- zipcode - character varying (9) - ZIP or ZIP+4
country - character varying (2) - [http://www.iso.ch/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/iso_3166-1_decoding_table.html ISO 3166] 2 character Country Code
Community
Description
- An organization, like a community wireless group or a company.
Fields
- id - numeric, primary key - unique ID
- createdate - ? - record creation date
- modificationdate - ? - last modification date
- name - character varying(10) - Organization name
General table design notes
When indexing one table to another table, ie when table A contains a foreign key from table B, follow these practices: BR
- 1..1 one to one mapping between table A and table B - create a field in table A with attribute 'REFERENCES B'. this tell postgresql that the field contains a unique ID into table B.
- 1..N one to many mapping between table A and table B - Create a table called A_B with two fields. One field is a uniqueID for table A. the other field is uniqueID for B with attribute 'REFERENCES B'. Create a field in table A with attribute 'REFERENCES A_B'. This will support cascading deletes since there is a path from a record in table A to the corresponding record(s) record in B.
- All tables should have an 'id' field of type numeric and attribute PRIMARY KEY. most tables should have a creationdate and modificationdate field of type timestamp - the default time is 'without timezone', all stored times should be in GMT.
To make a major change to a table, run 'pg_dump -t tablename databasename > file.sql' to get a record of the existing schema. Then modify and run through psql to recreate the table. Note that this method does not seem to save the PRIMARY KEY attribute so be sure to put that back into the id field.
System for getting at the data
- XML-RPC interface
http://xmlrpc.personaltelco.net/user
search(string regex) xml sql query
- retrieve(integer record id)
- retrieve(string username)
- modify(string fieldname, string fieldvalue)
- delete(integer record id)
- delete(string username)
http://xmlrpc.personaltelco.net/map
- nodes_in_area(GPS centerpoint, integer radius_in_meters)
Implementation
- PHP page talking to a MySQL server
[http://www.nodedb.com/ndbcom.dtd] NodeDB.com xml schema...
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