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World Cup 2014 with ROE

14 July 2014

football.db is a "free open public domain football (soccer) database". Instructions to construct an SQLite data file from the data are on the website. The database consists of 40 tables; its schema looks normalized. With the World Cup 2014 and dependent data, the file weighs in at ~1MB.

Let's see what we can do with the data using ROE.

Each league/tournament is given an event ID; the World Cup's event_id is 8.

| conn groups teams wcTeams |
conn := NBSQLite3BaseConnection on: ('/home/pierce/data/openfootball/sport.db').
conn open.
groups := (((RASQLiteRelation name: 'groups' connection: conn)
    where: #event_id equals: 8) 
	    projectAll: #(id title)) 
	    renameAll: #(id title) to: #(gid gTitle).
teams := (RASQLiteRelation name: 'teams' connection: conn) 
    renameAll: #(id title) to: #(tid tTitle).
wcTeams := ((RASQLiteRelation name: 'groups_teams' connection: conn) * groups
    whereEqual: #(group_id gid)).
((wcTeams * teams whereEqual: #(team_id tid)) 
    projectAll: #(gTitle tTitle)) explore.

The above code snippet results in a RAProjection instance. We can see its content by the following (pretty-printed by hand):

(self collect: [ :ea | ea values asArray ]) asArray 
#(#('Group A' 'Brazil') 
  #('Group A' 'Croatia') 
  #('Group A' 'Mexico') 
  #('Group A' 'Cameroon') 
  #('Group B' 'Spain') 
  #('Group B' 'Netherlands') 
  #('Group B' 'Chile') 
  #('Group B' 'Australia') 
  #('Group C' 'Colombia') 
  #('Group C' 'Greece') 
  #('Group C' 'Côte d''Ivoire') 
  #('Group C' 'Japan') 
  #('Group D' 'Uruguay') 
  #('Group D' 'Costa Rica') 
  #('Group D' 'England') 
  #('Group D' 'Italy') 
  #('Group E' 'Switzerland') 
  #('Group E' 'Ecuador') 
  #('Group E' 'France') 
  #('Group E' 'Honduras') 
  #('Group F' 'Argentina') 
  #('Group F' 'Bosnia-Herzegovina') 
  #('Group F' 'Iran') 
  #('Group F' 'Nigeria') 
  #('Group G' 'Germany') 
  #('Group G' 'Portugal') 
  #('Group G' 'Ghana') 
  #('Group G' 'United States') 
  #('Group H' 'Belgium') 
  #('Group H' 'Algeria') 
  #('Group H' 'Russia') 
  #('Group H' 'South Korea'))

(Ivory Coast's proper name in the output doesn't look right in Pharo. The SQLite database is correct though.)

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