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Sequel::JDBC::AS400::Dataset

Dataset class for AS400 datasets accessed via JDBC.

Constants

WILDCARD

Public Instance Methods

select_sql() click to toggle source

AS400 needs to use a couple of subselects for all limits and offsets.

# File lib/sequel/adapters/jdbc/as400.rb, line 28
def select_sql
  return super unless l = @opts[:limit]
  o = @opts[:offset] || 0
  order = @opts[:order]
  dsa1 = dataset_alias(1)
  dsa2 = dataset_alias(2)
  rn = row_number_column
  irn = Sequel::SQL::Identifier.new(rn).qualify(dsa2)
  subselect_sql(unlimited.
    from_self(:alias=>dsa1).
    select_more(Sequel::SQL::QualifiedIdentifier.new(dsa1, WILDCARD),
      Sequel::SQL::WindowFunction.new(SQL::Function.new(:ROW_NUMBER), Sequel::SQL::Window.new(:order=>order)).as(rn)).
    from_self(:alias=>dsa2).
    select(Sequel::SQL::QualifiedIdentifier.new(dsa2, WILDCARD)).
    where((irn > o) & (irn <= l + o)))
end
supports_window_functions?() click to toggle source
# File lib/sequel/adapters/jdbc/as400.rb, line 45
def supports_window_functions?
  true
end

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