module Sequel::Sequel4DatasetMethods
Public Instance Methods
and(*cond, &block)
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Alias for where.
# File lib/sequel/extensions/sequel_4_dataset_methods.rb, line 27 def and(*cond, &block) where(*cond, &block) end
exclude_where(*cond, &block)
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Alias for exclude.
# File lib/sequel/extensions/sequel_4_dataset_methods.rb, line 32 def exclude_where(*cond, &block) exclude(*cond, &block) end
interval(column=(no_arg = true), &block)
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Returns the interval between minimum and maximum values for the given column/expression. Uses a virtual row block if no argument is given.
DB[:table].interval(:id) # SELECT (max(id) - min(id)) FROM table LIMIT 1 # => 6 DB[:table].interval{function(column)} # SELECT (max(function(column)) - min(function(column))) FROM table LIMIT 1 # => 7
# File lib/sequel/extensions/sequel_4_dataset_methods.rb, line 43 def interval(column=(no_arg = true), &block) column = Sequel.virtual_row(&block) if no_arg if loader = cached_placeholder_literalizer(:_interval_loader) do |pl| arg = pl.arg aggregate_dataset.limit(1).select((SQL::Function.new(:max, arg) - SQL::Function.new(:min, arg)).as(:interval)) end loader.get(column) else aggregate_dataset.get{(max(column) - min(column)).as(:interval)} end end
range(column=(no_arg = true), &block)
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Returns a Range
instance made from the minimum and maximum
values for the given column/expression. Uses a virtual row block if no
argument is given.
DB[:table].range(:id) # SELECT max(id) AS v1, min(id) AS v2 FROM table LIMIT 1 # => 1..10 DB[:table].interval{function(column)} # SELECT max(function(column)) AS v1, min(function(column)) AS v2 FROM table LIMIT 1 # => 0..7
# File lib/sequel/extensions/sequel_4_dataset_methods.rb, line 63 def range(column=(no_arg = true), &block) column = Sequel.virtual_row(&block) if no_arg r = if loader = cached_placeholder_literalizer(:_range_loader) do |pl| arg = pl.arg aggregate_dataset.limit(1).select(SQL::Function.new(:min, arg).as(:v1), SQL::Function.new(:max, arg).as(:v2)) end loader.first(column) else aggregate_dataset.select{[min(column).as(v1), max(column).as(v2)]}.first end if r (r[:v1]..r[:v2]) end end