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HomeDatabaseMysql TutorialRedis入门基础教程

Redis是一个开源,先进的key-value存储,并用于构建高性能,可扩展的Web应用程序的完美解决方案。Redis是一个多实用的工具,可以

Redis是一个开源,先进的key-value存储,并用于构建高性能,可扩展的Web应用程序的完美解决方案。

Redis从它的许多竞争继承来的三个主要特点:

  • Redis数据库完全在内存中,使用磁盘仅用于持久性。

  • 相比许多键值数据存储,Redis拥有一套较为丰富的数据类型。

  • Redis可以将数据复制到任意数量的从服务器。

  • Redis 优势
  • 异常快速:Redis的速度非常快,每秒能执行约11万集合,每秒约81000+条记录。

  • 支持丰富的数据类型:Redis支持最大多数开发人员已经知道像列表,集合,有序集合,散列数据类型。这使得它非常容易解决各种各样的问题,因为我们知道哪些问题是可以处理通过它的数据类型更好。

  • 操作都是原子性:所有Redis操作是原子的,这保证了如果两个客户端同时访问的Redis服务器将获得更新后的值。

  • 多功能实用工具:Redis是一个多实用的工具,可以在多个用例如缓存,消息,队列使用(Redis原生支持发布/订阅),任何短暂的数据,应用程序,如Web应用程序会话,网页命中计数等。

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    Redis配置文件redis.conf 详解

    Redis - 环境

    Ubuntu上安装Redis,打开终端,然后键入以下命令:

     

    $sudo apt-get update $sudo apt-get install redis-server

    这将在您的计算机上安装Redis。

    启动 Redis

    $redis-server

    检查Redis是否在工作?

    $redis-cli

    这将打开一个Redis提示,如下图所示:

    redis 127.0.0.1:6379>

    上面的提示127.0.0.1是本机的IP地址,6379为Redis服务器运行的端口。现在输入PING命令,如下图所示。

    redis 127.0.0.1:6379> ping PONG

    这说明你已经成功地安装Redis在您的机器上。

    在Ubuntu上安装Redis的桌面管理器

    在Ubuntu上安装Redis的桌面管理器,只需从 打开下载软件包并安装它。

    Redis桌面管理器会给你用户界面来管理Redis的Key和数据。

    Redis - 数据类型

    Redis支持5种类型的数据类型,它描述如下的:

    字符串

    Redis字符串是字节序列。Redis字符串是二进制安全的,这意味着他们有一个已知的长度没有任何特殊字符终止,所以你可以存储任何东西,512兆为上限。

    例子

    上面是Redis的set和get命令的例子,Redis名称为yiibai使用的key存储在Redis的字符串值。

    哈希

    Redis的哈希是键值对的集合。 Redis的哈希值是字符串字段和字符串值之间的映射,因此它们被用来表示对象

    例子 1) "username" 2) "yiibai" 3) "password" 4) "yiibai" 5) "points" 6) "200"

    在上面的例子中的哈希数据类型,用于存储其中包含的用户的基本信息用户的对象。这里HMSET,HEGTALL用户命令user:1是键。

    列表

    Redis的列表是简单的字符串列表,排序插入顺序。您可以添加元素到Redis的列表的头部或尾部。

    例子 1) "rabitmq" 2) "mongodb" 3) "redis"

    列表的最大长度为 232 - 1 元素(4294967295,每个列表中可容纳超过4十亿的元素)。

    集合

    Redis的集合是字符串的无序集合。在Redis您可以添加,删除和测试文件是否存在,在成员O(1)的时间复杂度。

    例子 1) "rabitmq" 2) "mongodb" 3) "redis"

    注意:在上面的例子中rabitmq集合添加加两次,但由于集合元素具有唯一属性。

    集合中的元素最大数量为 232 - 1 (4294967295,可容纳超过4十亿元素)。

    有序集合

    Redis的有序集合类似于Redis的集合,字符串不重复的集合。不同的是,一个有序集合的每个成员用分数,以便采取有序set命令,从最小的到最大的成员分数有关。虽然成员具有唯一性,但分数可能会重复。

    例子 1) "redis" 2) "mongodb" 3) "rabitmq" Redis - keys

    Redis keys命令用于在Redis的管理键。Redis keys命令使用语法如下所示:

    语法 redis 127.0.0.1:6379> COMMAND KEY_NAME 例子

    在上面的例子中DEL是命令,而yiibai是key。如果key被删除,那么输出该命令将是(整数)1,否则它会是(整数)0

    Redis - Strings

    Redis strings命令用于在Redis的管理字符串值。Redis strings命令的使用语法,如下所示:

    语法 redis 127.0.0.1:6379> COMMAND KEY_NAME 例子

    在上面的例子SET和GET是命令,而yiibai是key。

    Redis - 哈希

    Redis的哈希值是字符串字段和字符串值之间的映射,所以他们是代表对象的完美数据类型

    在Redis的哈希值,最多可存储超过400十亿字段 - 值对。

    例子 1) "name" 2) "redis tutorial" 3) "description" 4) "redis basic commands for caching" 5) "likes" 6) "20" 7) "visitors" 8) "23000"

    在上面的例子中,已经在哈希命名yiibai的Redis集合名为tutorials(name, description, likes, visitors)

    Redis - 列表

    Redis的列表是简单的字符串列表,,排序插入顺序。您可以添加Redis元素在列表头部或列表的尾部。

    列表的最大长度为 232 - 1 个元素(每个列表元素个数超过4294967295)。

    例子 1) "mysql" 2) "mongodb" 3) "redis"

    在上述例子中的三个值被插入在redis列表名为LPUSH的命令教程。

    Redis - 集合

    Redis的集合是唯一的字符串的无序集合。集合的唯一性不允许数据的重复的键。

    在Redis的集合添加,删除和测试文件是否存在成员在O(1)(常数时间不管里面包含的元素集合的数量)。集合的最大长度为 232 - 1 个元素(每集合超过4294967295元素)。

    例子 1) "mysql" 2) "mongodb" 3) "redis"

    在上述例子中的三个值被命令SADD插入redis的集合名称tutorials。

    Redis有序集

    Redis的有序集合类似Redis的集合存储在设定值具有唯一性。不同的是,一个有序集合的每个成员用分数,以便采取有序set命令,从最小的到最大的分数有关。

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