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module Arel
module Visitors
class MySQL < Arel::Visitors::ToSql
private
def visit_Arel_Nodes_Union o, suppress_parens = false
left_result = case o.left
when Arel::Nodes::Union
visit_Arel_Nodes_Union o.left, true
else
visit o.left
end
right_result = case o.right
when Arel::Nodes::Union
visit_Arel_Nodes_Union o.right, true
else
visit o.right
end
if suppress_parens
"#{left_result} UNION #{right_result}"
else
"( #{left_result} UNION #{right_result} )"
end
end
def visit_Arel_Nodes_Bin o
"BINARY #{visit o.expr}"
end
###
# :'(
# http://dev.mysql.com/doc/refman/5.0/en/select.html#id3482214
def visit_Arel_Nodes_SelectStatement o
if o.offset && !o.limit
o.limit = Arel::Nodes::Limit.new(Nodes.build_quoted(18446744073709551615))
end
super
end
def visit_Arel_Nodes_SelectCore o
o.froms ||= Arel.sql('DUAL')
super
end
def visit_Arel_Nodes_UpdateStatement o
[
"UPDATE #{visit o.relation}",
("SET #{o.values.map { |value| visit value }.join ', '}" unless o.values.empty?),
("WHERE #{o.wheres.map { |x| visit x }.join ' AND '}" unless o.wheres.empty?),
("ORDER BY #{o.orders.map { |x| visit x }.join(', ')}" unless o.orders.empty?),
(visit(o.limit) if o.limit),
].compact.join ' '
end
end
end
end
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