redis把所有数据都通过SDS（simple dynamic string简单动态字符串）保存成字符串类型
我要评论struct sdshdr {
// 存储字符串的字符数组
char buff[];
// buff数组长度
unsigned int len;
// 可用字节
unsigned int free;
};
虚拟内存
跟MongoDB不同，Redis没有使用内存映射，而是自己实现了虚拟内存
安装$ cd /usr/local/src $ wget http://download.redis.io/releases/redis-4.0.2.tar.gz $ tar -zxvf redis-4.0.2.tar.gz $ mv redis-4.0.2 /usr/local/redis $ cd /usr/local/redis/ $ make $ src/redis-server基本命令
$ /usr/local/redis/src/redis-cli ---------字符串--------- set name pigfly OK get name pigfly set age 23 EX 10 #10秒后过期 OK get age 23 get age $-1 #10秒后已过期，返回-1 set name pig NX #不存在才设置 $-1 #因为存在所以返回失败 set name pig XX #存在才设置 OK get name pig ---------链表--------- lpush msg "hello!" :1 lpush msg "where are you?" :2 lrange msg 0 -1 where are you? hello! rpush msg "i'm here!" :3 lrange msg 0 -1 where are you? hello! i'm here! lindex msg 1 hello! lpop msg where are you? blpop news 0 #阻塞式 lrange msg 0 -1 lpush msg "hey" news bye~ hello! i'm here! :3 ---------散列表--------- hset userinfo name "pigfly" :1 hget userinfo name pigfly hgetall userinfo name pigfly hmset userinfo age 28 sex 1 OK hgetall userinfo name pigfly age 28 sex 1 hincrby userinfo age 1 :29 hget userinfo age 29 hmget userinfo name sex pigfly 1 hsetnx userinfo age 32 #字段不存在时才设置 :0 hget userinfo age 28 hsetnx userinfo qq "1315829" :1 hget userinfo qq 1315829 ---------集合--------- sadd friends:299 1 2 3 7 8 9 :6 smembers friends:299 1 2 3 7 8 9 scard friends:299 :6 sadd friends:300 1 7 10 11 :4 sdiff friends:299 friends:300 2 3 8 9 sdiff friends:300 friends:299 10 11 sismember friends:300 1 :1 sismember friends:300 6 :0 ---------有序集合--------- zadd hotlist 1 "xx" :1 zadd hotlist 5 "yy" 2 "bb" :2 zcard hotlist :3 zrange hotlist 0 -1 xx bb yy zrevrange hotlist 0 -1 yy bb xx zincrby hotlist 5 "bb" 7 zrevrange hotlist 0 -1 bb yy xx安装php客户端
$ cd /usr/local/src $ wget http://pecl.php.net/get/redis-3.1.4.tgz $ tar -zxvf redis-3.1.4.tgz $ cd redis-3.1.4 $ phpize $ ./configure $ make && make install #修改php配置文件 $ vi /usr/local/php/lib/php.ini extension=redis.so $ apachectl restart
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