ruby连接mysql，并在中间用memcached保存sql结果

好吧，我知道，这篇和前面一篇用python连接mysql的文章极大重复，我只是想试一下用ruby写程序，之前没玩过，很好奇。这里直接给最终结果了，步骤和python几乎完全一致。

先安装mysql的gem，还有依赖的其他lib

sudo apt-get install libmysqld-dev
sudo apt-get install libmysqlclient-dev
sudo gem install mysql

还需要安装ruby的memcached gem。

gem install memcache-client

然后是连接mysql和memcached的ruby代码

 1 #!/usr/bin/env ruby
 2 # 20140106, conn_mysql.rb
 3 
 4 require "rubygems"
 5 require "mysql"
 6 require "memcache"
 7 require "digest/md5"
 8 
 9 class ConnMysql
10     def connect_db()
11         @client = Mysql.new("192.168.1.6", "dba", 
12                             "111111", "testdb")
13     end
14 
15     def connect_cache()
16         server = ['localhost:11211']
17         option = {}
18         @mc = MemCache.new(server, option)
19     end
20 
21     def test_select()
22         result = @client.query("select * from id_info;")
23 
24         result.each_hash do |row|
25             "id:#{row['id']}, info:#{row['info']}"
26         end
27     end
28 
29     def test_count(str_sql)
30         result = @client.query(str_sql)
31 
32         row = result.fetch_row()
33         return "#{row[0]}"
34     end
35 
36     def test_count_cached(str_sql)
37         str_hash = Digest::MD5.hexdigest(str_sql)
38 
39         result = @mc[str_hash]
40         if result != nil
41             return result
42         end
43         puts Digest::MD5.hexdigest(str_sql)
44         result = @client.query(str_sql)
45 
46         row = result.fetch_row()
47         @mc[str_hash] = row
48         
49         str_rows = "#{row[0]}"
50         return str_rows
51     end
52 
53     def disconnect_db()
54         @client.close()
55     end
56 
57 end

然后是不使用memcached，直接去mysql查询的代码

 1 #!/usr/bin/env ruby
 2 # 20140106, conn_mysql_raw.rb
 3 
 4 require "rubygems"
 5 
 6 require_relative "conn_mysql"
 7 
 8 str_sql = "select count(*) from id_info where info like \'bbb%\';"
 9 
10 db_connect = ConnMysql.new
11 db_connect.connect_db()
12 result = ""
13 i = 0
14 
15 while i < 10000
16     result = db_connect.test_count(str_sql)
17     i += 1
18 end
19 
20 puts "#{result} rows selected."
21 
22 db_connect.disconnect_db()

最后是使用memcached的代码，当然运行的时候，需要memcached服务是运行着的

 1 #!/usr/bin/env ruby
 2 # 20140106, conn_mysql_memcached.rb
 3 
 4 require "rubygems"
 5 
 6 require_relative "conn_mysql"
 7 
 8 str_sql = "select count(*) from id_info where info like \'bbb%\';"
 9 
10 db_connect = ConnMysql.new
11 db_connect.connect_db()
12 db_connect.connect_cache()
13 
14 result = ""
15 i = 0
16 
17 while i < 10000
18     result = db_connect.test_count_cached(str_sql)
19     i += 1
20 end
21 
22 puts "#{result} rows selected."
23 
24 db_connect.disconnect_db()

两者相比，时间上分别是2.9s和1.5s，似乎整体上比python慢一点，不知道问题在哪。

posted @ 2014-01-07 15:47  valleylord  阅读(423)  评论(0)  编辑  收藏  举报