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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 create(relation)
primary_key_value = if relation.primary_key.blank?
nil
elsif relation.record.is_a?(Hash)
attribute = relation.record.detect { |attr, _| attr.name.to_s == relation.primary_key.to_s }
attribute && attribute.last.value
end
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
end
end
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