Represents an SQL function call.
The array of arguments to pass to the function (may be blank)
The SQL function to call
The SQL function to call
Options for this function
Set the name and args for the function
# File lib/sequel/sql.rb, line 1243 def initialize(name, *args) @name = name @args = args @opts = OPTS end
# File lib/sequel/sql.rb, line 1249 def self.new!(name, args, opts) f = new(name, *args) f.instance_variable_set(:@opts, opts) f end
If no arguments are given, return a new function with the wildcard prepended to the arguments.
Sequel.function(:count).* # count(*)
# File lib/sequel/sql.rb, line 1258 def *(ce=(arg=false;nil)) if arg == false raise Error, "Cannot apply * to functions with arguments" unless args.empty? with_opts(:"*"=>true) else super(ce) end end
Return a new function with DISTINCT before the method arguments.
Sequel.function(:count, :col).distinct # count(DISTINCT col)
# File lib/sequel/sql.rb, line 1270 def distinct with_opts(:distinct=>true) end
Return a new function with FILTER added to it, for filtered aggregate functions:
Sequel.function(:foo, :col).filter(:a=>1) # foo(col) FILTER (WHERE a = 1)
# File lib/sequel/sql.rb, line 1278 def filter(*args, &block) args = args.first if args.length == 1 with_opts(:filter=>args, :filter_block=>block) end
Return a function which will use LATERAL when literalized:
Sequel.function(:foo, :col).lateral # LATERAL foo(col)
# File lib/sequel/sql.rb, line 1286 def lateral with_opts(:lateral=>true) end
Return a new function with an OVER clause (making it a window function).
Sequel.function(:row_number).over(:partition=>:col) # row_number() OVER (PARTITION BY col)
# File lib/sequel/sql.rb, line 1293 def over(window=OPTS) raise Error, "function already has a window applied to it" if opts[:over] window = Window.new(window) unless window.is_a?(Window) with_opts(:over=>window) end
Return a new function where the function name will be quoted if the database supports quoted functions:
Sequel.function(:foo).quoted # "foo"()
# File lib/sequel/sql.rb, line 1303 def quoted with_opts(:quoted=>true) end
Return a new function where the function name will not be quoted even if the database supports quoted functions:
Sequel.expr(:foo).function.unquoted # foo()
# File lib/sequel/sql.rb, line 1311 def unquoted with_opts(:quoted=>false) end
Return a new function that will use WITH ORDINALITY to also return a row number for every row the function returns:
Sequel.function(:foo).with_ordinality # foo() WITH ORDINALITY
# File lib/sequel/sql.rb, line 1319 def with_ordinality with_opts(:with_ordinality=>true) end
Return a new function that uses WITHIN GROUP ordered by the given expression, useful for ordered-set and hypothetical-set aggregate functions:
Sequel.function(:rank, :a).within_group(:b, :c) # rank(a) WITHIN GROUP (ORDER BY b, c)
# File lib/sequel/sql.rb, line 1328 def within_group(*expressions) with_opts(:within_group=>expressions) end
Return a new function call with the given opts merged into the current opts.
# File lib/sequel/sql.rb, line 1337 def with_opts(opts) self.class.new!(name, args, @opts.merge(opts)) end