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module ActiveRecord
class QueryCache #:nodoc:
def initialize(connection)
@connection = connection
@query_cache = {}
end
def clear_query_cache
@query_cache = {}
end
def select_all(sql, name = nil)
(@query_cache[sql] ||= @connection.select_all(sql, name)).dup
end
def select_one(sql, name = nil)
@query_cache[sql] ||= @connection.select_one(sql, name)
end
def columns(table_name, name = nil)
@query_cache["SHOW FIELDS FROM #{table_name}"] ||= @connection.columns(table_name, name)
end
def insert(sql, name = nil, pk = nil, id_value = nil)
clear_query_cache
@connection.insert(sql, name, pk, id_value)
end
def update(sql, name = nil)
clear_query_cache
@connection.update(sql, name)
end
def delete(sql, name = nil)
clear_query_cache
@connection.delete(sql, name)
end
private
def method_missing(method, *arguments, &proc)
@connection.send(method, *arguments, &proc)
end
end
class Base
# Set the connection for the class with caching on
class << self
alias_method :connection_without_query_cache=, :connection=
def connection=(spec)
if spec.is_a?(ConnectionSpecification) and spec.config[:query_cache]
spec = QueryCache.new(self.send(spec.adapter_method, spec.config))
end
self.connection_without_query_cache = spec
end
end
end
class AbstractAdapter #:nodoc:
# Stub method to be able to treat the connection the same whether the query cache has been turned on or not
def clear_query_cache
end
end
end
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