REDIS与MYSQL实现标签的对比
- - CSDN博客推荐文章这里来演示下REDIS和MYSQL之间的数据转换问题,REDIS 是典型的KEY -VALUE型NOSQL数据库,并且提供了额外丰富的数据类型. 这里简单列举了标签类型的应用问题. 比如在MySQL里面,对内容的标签有以下简单的几张表,我这里只列出来拆分过后的表结构. 内容表:
CREATE TABLE `content` (
`id` int(10) unsigned NOT NULL, -- 内容ID,唯一.
比如在MySQL里面,对内容的标签有以下简单的几张表,我这里只列出来拆分过后的表结构
内容表: CREATE TABLE `content` ( `id` int(10) unsigned NOT NULL, -- 内容ID,唯一。 `name` varchar(60) DEFAULT NULL, -- 内容的名字 `created_timestamp` timestamp NULL DEFAULT NULL, -- 内容的加入时间 PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 标签表: CREATE TABLE `tag` ( `tag_name` varchar(60) NOT NULL, -- 标签名字,唯一 `visit_count` int(10) unsigned NOT NULL DEFAULT '0', -- 标签的访问次数 PRIMARY KEY (`tag_name`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 内容与标签的关系,多对多。 CREATE TABLE `content_tag_relation` ( `content_id` int(10) unsigned NOT NULL, -- 内容ID `tag_name` varchar(60) NOT NULL -- 标签名字 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
SELECT a.name FROM content AS a,content_tag_relation AS b WHERE a.id = b.content_id AND b.tag_name = 'mysql'
SELECT tag_name FROM tag WHERE 1 ORDER BY visit_count DESC LIMIT 3;
t_girl:6379> set string:content_id:4 '{"name":"test48601","created_timestamp":"2012-01-01 05:41:01"}' OK t_girl:6379> get string:content_id:4 "{\"name\":\"test48601\",\"created_timestamp\":\"2012-01-01 05:41:01\"}"
t_girl:6379> hset 'hset:content_id:4' name 'test48601' (integer) 1 t_girl:6379> hset 'hset:content_id:4' created_timestamp '2012-01-01 05:41:01' (integer) 1
t_girl:6379> hget hset:content_id:4 name "test48601" t_girl:6379> hget hset:content_id:4 created_timestamp "2012-01-01 05:41:01" t_girl:6379>
t_girl:6379> zadd zset:tag 680 database 469 db2 (integer) 2
t_girl:6379> zrevrangebyscore zset:tag +inf 0 limit 0 3 1) "mongodb" 2) "sql" 3) "postgresql"
t_girl:6379> sadd set:content_id:4 role mongodb role database (integer) 3
t_girl:6379> smembers set:content_id:4 1) "database" 2) "role" 3) "mongodb"
import redis content_id_keys = r.keys('set*') content_id_keys_len = len(content_id_keys) i = 0 j = 0 content_name_list = [] while i < content_id_keys_len: if r.sismember(content_id_keys[i],'mysql') == 1: content_name_list.append(eval(r.get(content_id_keys[i].replace('set','string')))['name']) print('Content name is :' + content_name_list[j]) j += 1 i += 1
t_girl:6379> sadd tag:mysql test123 test133 test144 test155 (integer) 4 t_girl:6379> smembers tag:mysql 1) "test133" 2) "test155" 3) "test123" 4) "test144"