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module Arel
module Sql
class Engine
def initialize(ar = nil)
@ar = ar
end
def connection
@ar ? @ar.connection : nil
end
def adapter_name
@adapter_name ||= case (name = connection.adapter_name)
# map OracleEnanced adapter to Oracle
when /Oracle/
'Oracle'
else
name
end
end
def method_missing(method, *args, &block)
@ar.connection.send(method, *args, &block)
end
module CRUD
def create(relation)
attribute = [*relation.record].map do |attr, value|
if attr.respond_to?(:name) && !relation.primary_key.blank? && attr.name == relation.primary_key
value
end
end.compact.first
primary_key_value = attribute ? attribute.value : nil
connection.insert(relation.to_sql(false), nil, relation.primary_key, primary_key_value)
end
def read(relation)
rows = connection.select_rows(relation.to_sql)
Array.new(rows, relation.attributes)
end
def update(relation)
connection.update(relation.to_sql)
end
def delete(relation)
connection.delete(relation.to_sql)
end
end
include CRUD
end
end
end
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