aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/lib/active_record/query_cache.rb
blob: 794caff59c68c35cbcf733fbd4f687ca7c2faa85 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
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
    def self.connection=(spec)
      raise ConnectionNotEstablished unless spec

      conn = spec.config[:query_cache] ?
        QueryCache.new(self.send(spec.adapter_method, spec.config)) :
        self.send(spec.adapter_method, spec.config)
      
      active_connections[self] = conn
    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