redis的简单使用

文章目录

环境安装与配置
redis发布-订阅相关命令
redis发布-订阅的客户端编程
redis的订阅发布的例子

环境安装与配置

sudo apt-get install redis-server # ubuntu命令安装redis服务

ubuntu通过上面命令安装完redis，会自动启动redis服务，通过ps命令确认：

wxncom@wxncom-virtual-machine:~$ ps -ef | grep redis
redis      6594      1  0 16:28 ?        00:00:00 /usr/bin/redis-server 127.0.0.1:6379
wxncom     7003   1827  0 16:29 pts/0    00:00:00 grep --color=auto redis

可以看到redis默认工作在本地主机的6379端口上。

而mysql默认运行在3306端口上.

redis发布-订阅相关命令

redis支持多种数据结构,如:

字符串、list列表、set集合、map映射表等结构。

启动redis-cli客户端，连接redis server体验一下数据缓存功能，如下：
redis存储普通key-value：

wxncom@wxncom-virtual-machine:~$ redis-cli
s127.0.0.1:6379> set "abc" "hello world!"
OK
127.0.0.1:6379> get "abc"
"hello world!"
127.0.0.1:6379>

subscribe 13 // 订阅通道

publish 13 "message" //向某个通道发送消息

在这里插入图片描述

redis发布-订阅的客户端编程

redis支持多种不同的客户端编程语言，例如Java对应jedis、php对应phpredis、C++对应的则是
hiredis。下面是安装hiredis的步骤：

git clone https://github.com/redis/hiredis 从github上下载hiredis客户端，进行源码
编译安装

wxncom@wxncom-virtual-machine:~/redis$ git clone https://github.com/redis/hiredis
Cloning into 'hiredis'...
fatal: unable to access 'https://github.com/redis/hiredis/': Failed to connect to github.com port 443: Connection refused
wxncom@wxncom-virtual-machine:~/redis$ git clone https://github.com/redis/hiredis
Cloning into 'hiredis'...
remote: Enumerating objects: 4682, done.
remote: Counting objects: 100% (239/239), done.
remote: Compressing objects: 100% (113/113), done.
remote: Total 4682 (delta 140), reused 177 (delta 126), pack-reused 4443
Receiving objects: 100% (4682/4682), 1.68 MiB | 1.93 MiB/s, done.
Resolving deltas: 100% (2924/2924), done.
wxncom@wxncom-virtual-machine:~/redis$ ls
hiredis
wxncom@wxncom-virtual-machine:~/redis$ cd hiredis/
wxncom@wxncom-virtual-machine:~/redis/hiredis$

如果遇到下面这个情况,多试几次,github那边的服务器很拉胯的,你需要多尝试几次,来建立tcp连接(http协议使用的是 : 基于TCP的传输层协议)

wxncom@wxncom-virtual-machine:~/redis$ git clone https://hub.fastgit.org/redis/hiredis
Cloning into 'hiredis'...
fatal: unable to access 'https://hub.fastgit.org/redis/hiredis/': Failed to connect to hub.fastgit.org port 443: Connection refused

cd hiredis
make

wxncom@wxncom-virtual-machine:~/redis/hiredis$ make
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic alloc.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic net.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic hiredis.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic sds.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic async.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic read.c
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic sockcompat.c
cc  -shared -Wl,-soname,libhiredis.so.1.2.1-dev -o libhiredis.so alloc.o net.o hiredis.o sds.o async.o read.o sockcompat.o 
ar rcs libhiredis.a alloc.o net.o hiredis.o sds.o async.o read.o sockcompat.o
cc -std=c99 -c -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic test.c
cc -o hiredis-test -O3 -fPIC   -Wall -Wextra -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -Werror -g -ggdb  -pedantic -I. test.o libhiredis.a  
Generating hiredis.pc for pkgconfig...
wxncom@wxncom-virtual-machine:~/redis/hiredis$

编译成功！