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Contents
module Amalgalite::SQLite3
class Database
##
# A wrapper around a proc for use as an SQLite Ddatabase fuction
#
# f = Function.new( 'md5', lambda { |x| Digest::MD5.hexdigest( x.to_s ) } )
#
class Function
# the name of the function, and how it will be called in SQL
attr_reader :name
# The unique signature of this function. This is used to determin if the
# function is already registered or not
#
def self.signature( name, arity )
"#{name}/#{arity}"
end
# Initialize with the name and the Proc
#
def initialize( name, _proc )
@name = name
@function = _proc
end
# The unique signature of this function
#
def signature
@signature ||= Function.signature( name, arity )
end
alias :to_s :signature
# The arity of SQL function, -1 means it is takes a variable number of
# arguments.
#
def arity
@function.arity
end
# Invoke the proc
#
def call( *args )
@function.call( *args )
end
end
end
end
Version data entries
83 entries across 83 versions & 2 rubygems