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module ActiveRecord
module ConnectionAdapters
# Like a regular database, each table in Hypertable has a fixed list
# of columns. However, Hypertable allows flexible schemas through the
# use of column qualifiers. Suppose a table is defined to have a single
# column called misc.
#
# CREATE TABLE pages (
# 'misc'
# )
#
# In Hypertable, each traditional database column is referred to as
# a column family. Each column family can have a theoretically infinite
# number of qualified instances. An instance of a qualified column
# is referred to using the column_family:qualifer notation. e.g.,
#
# misc:red
# misc:green
# misc:blue
#
# These qualified column instances do not need to be declared as part
# of the table schema. The table schema itself does not provide
# an indication of whether a column family has been used with qualifiers.
# As a results, we must explicitly declare intent to use a column family
# in a qualified manner in our class definition. The resulting AR
# object models the column family as a Hash.
#
# class Page < ActiveRecord::HyperBase
# qualified_column :misc
# end
#
# p = Page.new
# p.ROW = 'page_1'
# p.misc['url'] = 'http://www.zvents.com/'
# p.misc['hits'] = 127
# p.save
class QualifiedColumn < Column
attr_accessor :qualifiers
def initialize(name, default, sql_type = nil, null = true)
@qualifiers ||= []
super
end
def klass
Hash
end
def default
h = Hash.new
h.default = @default
h
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems