exists命令
127.0.0.1:6379> keys * 1) "name" 2) "age" 127.0.0.1:6379> exists name #查看key值为name的数据是否存在 (integer) 1 #若存在则返回1 127.0.0.1:6379> exists name1 (integer) 0 #若不存在则返回0
move命令
127.0.0.1:6379> move name 1 #移除一个key值,后面的数字1,代表当前数据库 (integer) 1 #返回值为1,则代表移除成功 127.0.0.1:6379> keys * 1) "age" 127.0.0.1:6379>
expire命令,设置过期时间,单位是秒
127.0.0.1:6379> keys * 1) "name" 2) "age" 127.0.0.1:6379> expire name 10 #给key值name,设置过期时间 (integer) 1 127.0.0.1:6379> ttl name #查看剩余的过期时间 (integer) 5 127.0.0.1:6379> ttl name (integer) 2 127.0.0.1:6379> ttl name (integer) -2 127.0.0.1:6379> get name (nil) 127.0.0.1:6379>
type命令,查看数据的类型
127.0.0.1:6379> keys * 1) "age" 127.0.0.1:6379> type age string 127.0.0.1:6379>
append命令,在值后面追加新的字符串
127.0.0.1:6379> exists key1 (integer) 1 127.0.0.1:6379> get key1 "v1" 127.0.0.1:6379> append key1 hello (integer) 7 127.0.0.1:6379> get key1 "v1hello" 127.0.0.1:6379>
strlen命令,获取字符串的长度
127.0.0.1:6379> strlen key1 (integer) 7 127.0.0.1:6379> append key1 ",kuangshen" (integer) 17 127.0.0.1:6379> strlen key1 (integer) 17
append key,若该Key不存在,就相当于set key
127.0.0.1:6379> keys * 1) "key1" 127.0.0.1:6379> append name zhangsan (integer) 8 127.0.0.1:6379> keys * 1) "name" 2) "key1"
incr命令,参数加1命令
127.0.0.1:6379> set views 0 OK 127.0.0.1:6379> get views "0" 127.0.0.1:6379> incr views #参数加1命令 (integer) 1 127.0.0.1:6379> get views "1"
decr命令,参数减1命令
127.0.0.1:6379> get views "0" 127.0.0.1:6379> decr views (integer) -1 127.0.0.1:6379> decr views (integer) -2 127.0.0.1:6379> get views "-2"
incrby命令,按设置的步长增加数
127.0.0.1:6379> get views "-2" 127.0.0.1:6379> incrby views 10 (integer) 8 127.0.0.1:6379> get views "8"
decrby命令,按设置的步长减数
127.0.0.1:6379> get views "8" 127.0.0.1:6379> decrby views 5 (integer) 3 127.0.0.1:6379> get views "3"
getrange命令,获取指定的字符串
127.0.0.1:6379> set key1 "hello,kuangshen" OK 127.0.0.1:6379> getrange key1 0 3 "hell"
127.0.0.1:6379> keys * 1) "key1" 127.0.0.1:6379> get key1 "hello,kuangshen" 127.0.0.1:6379> GETRANGE key1 0 -1 #0至-1,用于显示整个字符串 "hello,kuangshen"
setrange命令,修改指定的字符串
127.0.0.1:6379> set key2 abcdefgh OK 127.0.0.1:6379> get key2 "abcdefgh" 127.0.0.1:6379> setrange key2 1 xxx (integer) 8 127.0.0.1:6379> get key2 "axxxefgh"
setex命令(set with expire),设置值的同时设置过期时间
127.0.0.1:6379> setex key3 60 english OK 127.0.0.1:6379> ttl key3 (integer) 54 127.0.0.1:6379> get key3 "english" 127.0.0.1:6379> ttl key3 (integer) -2 127.0.0.1:6379> get key3 (nil)
setnx命令(set if not exist),如果不存在该key值,则设置。如果存在该key值,再次设置,不生效。
127.0.0.1:6379> setnx mykey redis (integer) 1 127.0.0.1:6379> keys * 1) "key1" 2) "key2" 3) "mykey" 127.0.0.1:6379> setnx mykey mongodb #mykey已经存在了,则设置失败 (integer) 0 127.0.0.1:6379> get mykey "redis"
mset命令,批量设置值
127.0.0.1:6379> mset k1 v1 k2 v2 k3 v3 OK 127.0.0.1:6379> keys * 1) "k3" 2) "k2" 3) "k1"
mget命令,批量获取值
127.0.0.1:6379> mget k1 k2 k3 1) "v1" 2) "v2" 3) "v3"
msetnx命令,批量设置值,如果不存在,则创建。存在的key值,再创建,会失败
127.0.0.1:6379> keys * 1) "k3" 2) "k2" 3) "k1" 127.0.0.1:6379> msetnx k1 v1 k4 v4 #是一个原子性的操作,要么一起成功,要么一起失败 (integer) 0 127.0.0.1:6379> get key4 (nil)
设置对象,存储一个用户的年龄,名字信息
127.0.0.1:6379> mset user:1:name zhangsan user:1:age 4 OK 127.0.0.1:6379> mget user:1:name user:1:age 1) "zhangsan" 2) "4"
getset命令,先get值,再set值
127.0.0.1:6379> getset dg redis #get dg的值(因为首次dg的值不存在),所以不成功。但是set的值,是成功的 (nil) 127.0.0.1:6379> get dg "redis" 127.0.0.1:6379> getset dg mongodb #先get dg的值,成功。再重新set dg的值,也成功 "redis" 127.0.0.1:6379> get dg "mongodb"
list数据类型中,所有的命令都是以l开头的。
往list数据类型中添加值,lpush命令
127.0.0.1:6379> lpush list one (integer) 1 127.0.0.1:6379> lpush list two (integer) 2 127.0.0.1:6379> lpush list three (integer) 3
查看list数据类型中的值,lrange命令
127.0.0.1:6379> lrange list 0 -1 1) "three" 2) "two" 3) "one"
127.0.0.1:6379> lrange list 0 1 1) "three" 2) "two"
从右方将值放入列表,rpush命令
rpush list right (integer) 4 127.0.0.1:6379> lrange list 0 -1 #查看list列表中所有的值 1) "three" 2) "two" 3) "one" 4) "right"
lpop从左边移除一个元素,rpop从右边移除一个元素
127.0.0.1:6379> lpop list "three" 127.0.0.1:6379> rpop list "right" 127.0.0.1:6379> lrange list 0 -1 1) "two" 2) "one"
lindex获取列表中指定索引的值
127.0.0.1:6379> lindex list 0 "two"
flushdb清空数据库
llen查看某个列表的长度
127.0.0.1:6379> lpush list one (integer) 1 127.0.0.1:6379> lpush list two (integer) 2 127.0.0.1:6379> lpush list three (integer) 3 127.0.0.1:6379> llen list (integer) 3
lrem,移除list列表中的值
127.0.0.1:6379> LREM list 1 one (integer) 1 127.0.0.1:6379> lrange list 0 -1 1) "three" 2) "three" 3) "two"
127.0.0.1:6379> lrange list 0 -1 1) "three" 2) "three" 3) "two" 127.0.0.1:6379> lrem list 2 three (integer) 2 127.0.0.1:6379> lrange list 0 -1 1) "two"
ltrim,截断命令,只保留指定区间内的元素
127.0.0.1:6379> rpush mylist "hello" (integer) 1 127.0.0.1:6379> rpush mylist "hello1" (integer) 2 127.0.0.1:6379> rpush mylist "hello2" (integer) 3 127.0.0.1:6379> rpush mylist "hello3" (integer) 4 127.0.0.1:6379> ltrim mylist 1 2 OK 127.0.0.1:6379> lrange mylist 0 -1 1) "hello1" 2) "hello2"
rpoplpush,移除列表中最右边的元素,到新的列表中
127.0.0.1:6379> flushdb OK 127.0.0.1:6379> rpush mylist hello (integer) 1 127.0.0.1:6379> rpush mylist hello1 (integer) 2 127.0.0.1:6379> rpush mylist hello2 (integer) 3 127.0.0.1:6379> lrange mylist 0 -1 1) "hello" 2) "hello1" 3) "hello2" 127.0.0.1:6379> rpoplpush mylist myotherlist "hello2" 127.0.0.1:6379> lrange mylist 0 -1 1) "hello" 2) "hello1" 127.0.0.1:6379> lrange myotherlist 0 -1 1) "hello2"
exists,判断某个列表是否存在
127.0.0.1:6379> exists list (integer) 0
lset,将列表中指定下标的值,更新为新的值。lset只能更新值,不能添加值,添加值用lpush或rpush。
127.0.0.1:6379> flushdb OK 127.0.0.1:6379> exists list (integer) 0 127.0.0.1:6379> lpush list value1 (integer) 1 127.0.0.1:6379> lrange list 0 -1 1) "value1" 127.0.0.1:6379> lset list 0 item OK 127.0.0.1:6379> lrange list 0 -1 1) "item"
127.0.0.1:6379> lset list 1 other #不存在的下标,就会报错 (error) ERR index out of range
linsert,向列表中指定元素前或后,插入值
127.0.0.1:6379> flushdb OK 127.0.0.1:6379> rpush mylist hello (integer) 1 127.0.0.1:6379> rpush mylist world (integer) 2 127.0.0.1:6379> LINSERT mylist before world other (integer) 3 127.0.0.1:6379> lrange mylist 0 -1 1) "hello" 2) "other" 3) "world"
set中的值不能重复。
sadd,向set数据类型中添加值。smembers,查看set数据类型中的元素。
127.0.0.1:6379> sadd myset "hello" (integer) 1 127.0.0.1:6379> sadd myset "kuangshen" (integer) 1 127.0.0.1:6379> sadd myset "love kuangshen" (integer) 1 127.0.0.1:6379> SMEMBERS myset 1) "love kuangshen" 2) "kuangshen" 3) "hello"
sismember,判断某个元素是否存在于指定的set集合中。
127.0.0.1:6379> SISMEMBER myset hello (integer) 1 127.0.0.1:6379> SISMEMBER myset world (integer) 0
scard,获取指定集合中元素的个数。
27.0.0.1:6379> scard myset (integer) 3
srem,移除set集合中指定的元素。
127.0.0.1:6379> srem myset hello (integer) 1 127.0.0.1:6379> SMEMBERS myset 1) "love kuangshen" 2) "kuangshen"
srandmember,从set集合中随机挑选出一个元素。
127.0.0.1:6379> SRANDMEMBER myset "kuangshen"
spop,随机从set集合中移除一个元素。
127.0.0.1:6379> SMEMBERS myset 1) "love kuangshen" 2) "kuangshen" 3) "zhouhao" 127.0.0.1:6379> SPOP myset "zhouhao"
smov,将一个集合中的一个元素,移动到另一个集合中。
127.0.0.1:6379> sadd myset hello (integer) 1 127.0.0.1:6379> sadd myset world (integer) 1 127.0.0.1:6379> sadd myset kuangshen (integer) 1 127.0.0.1:6379> sadd myset2 zhouhao (integer) 1 127.0.0.1:6379> keys * 1) "myset" 2) "myset2" 127.0.0.1:6379> SMOVE myset myset2 hello (integer) 1 127.0.0.1:6379> SMEMBERS myset 1) "kuangshen" 2) "world" 127.0.0.1:6379> SMEMBERS myset2 1) "hello" 2) "zhouhao"
sdiff,查看两个集合的差集。
127.0.0.1:6379> flushdb OK 127.0.0.1:6379> sadd key1 a (integer) 1 127.0.0.1:6379> sadd key1 b (integer) 1 127.0.0.1:6379> sadd key1 c (integer) 1 127.0.0.1:6379> sadd key2 c (integer) 1 127.0.0.1:6379> sadd key2 d (integer) 1 127.0.0.1:6379> sadd key2 e (integer) 1 127.0.0.1:6379> SDIFF key1 key2 1) "a" 2) "b"
sinter,查看两个集合的交集。
127.0.0.1:6379> SINTER key1 key2 1) "c"
sunion,获取两个集合的并集。
127.0.0.1:6379> SUNION key1 key2 1) "e" 2) "b" 3) "c" 4) "d" 5) "a"
Hash数据类型就是Map数据类型,key-,key-map
hset,设置值。hget,获取hash数据类型中的值。
127.0.0.1:6379> hset myhash field1 kuangshen (integer) 1 127.0.0.1:6379> hget myhash field1 "kuangshen"
hmset,一次设置多个值。hmget,一次获取多个值。
127.0.0.1:6379> hmset myhash field1 hello field2 world OK 127.0.0.1:6379> hmget myhash field1 1) "hello" 127.0.0.1:6379> hmget myhash field1 field2 1) "hello" 2) "world"
hgetall,获得hash数据类型中所有的值。
127.0.0.1:6379> hgetall myhash 1) "field1" 2) "hello" 3) "field2" 4) "world"
hdel,删除hash数据类型中的某一字段。
127.0.0.1:6379> hdel myhash field1 (integer) 1 127.0.0.1:6379> hgetall myhash 1) "field2" 2) "world"
hlen,获取字段长度。
127.0.0.1:6379> hlen myhash (integer) 1
hexists,判断hash中某个字段是否存在。
127.0.0.1:6379> hgetall myhash 1) "field2" 2) "world" 3) "field1" 4) "hello" 127.0.0.1:6379> hexists myhash field1 (integer) 1 127.0.0.1:6379> hexists myhash field3 (integer) 0
hkeys,只获取hash中的key。hvals,只获取hash中的value。
127.0.0.1:6379> hkeys myhash 1) "field2" 2) "field1" 127.0.0.1:6379> hvals myhash 1) "world" 2) "hello"
hincrby,让某个元素增加一个值。
127.0.0.1:6379> hset myhash field3 5 (integer) 1 127.0.0.1:6379> HINCRBY myhash field3 1 (integer) 6 127.0.0.1:6379> hgetall myhash 1) "field2" 2) "world" 3) "field1" 4) "hello" 5) "field3" 6) "6"
hsetnx,判断字段是否存在,不存在就创建值。如果存在,就创建失败。
127.0.0.1:6379> HSETNX myhash field4 hello (integer) 1 127.0.0.1:6379> HSETNX myhash field4 world (integer) 0
哈希数据类型,适合存储用户信息。
127.0.0.1:6379> hset user:1 name zhouhao age 10 (integer) 2 127.0.0.1:6379> hgetall user:1 1) "name" 2) "zhouhao" 3) "age" 4) "10"
zadd,向集合中添加值。
127.0.0.1:6379> zadd myset 1 one (integer) 1 127.0.0.1:6379> zadd myset 2 two 3 three (integer) 2
zrange,获取集合中的值。
127.0.0.1:6379> zrange myset 0 -1 1) "one" 2) "two" 3) "three"
ZRANGEBYSCORE,按照score排序。
127.0.0.1:6379> flushdb OK 127.0.0.1:6379> zadd salary 3000 xiaohong (integer) 1 127.0.0.1:6379> zadd salary 5000 zhangsan (integer) 1 127.0.0.1:6379> zadd salary 500 kuangshen (integer) 1 127.0.0.1:6379> ZRANGEBYSCORE salary -inf +inf 1) "kuangshen" 2) "xiaohong" 3) "zhangsan" 127.0.0.1:6379> ZRANGEBYSCORE salary -inf +inf withscores 1) "kuangshen" 2) "500" 3) "xiaohong" 4) "3000" 5) "zhangsan" 6) "5000" 127.0.0.1:6379> ZRANGEBYSCORE salary -inf 4000 withscores #范围从负无穷至4000 1) "kuangshen" 2) "500" 3) "xiaohong" 4) "3000"
zrem,移除集合中,指定的key中,指定的元素。
127.0.0.1:6379> zrem salary xiaohong (integer) 1 127.0.0.1:6379> zrange salary 0 -1 1) "kuangshen" 2) "zhangsan"
zcard,查看指定key中的元素。
127.0.0.1:6379> zcard salary (integer) 2
zrevrange,按照倒叙排列value的值。即从大到小排序。
127.0.0.1:6379> ZREVRANGE salary 0 -1 1) "zhangsan" 2) "kuangshen"
zcount,获取指定区间内的元素数量。
127.0.0.1:6379> FLUSHDB OK 127.0.0.1:6379> zadd myset 1 hello 2 world 3 kuangshen (integer) 3 127.0.0.1:6379> zcount myset 1 3 (integer) 3
geoadd,添加城市
127.0.0.1:6379> geoadd china:city 116.40 39.90 beijing (integer) 1 127.0.0.1:6379> geoadd china:city 121.47 31.23 shanghai (integer) 1 127.0.0.1:6379> geoadd china:city 106.50 29.53 chongqing 114.08 22.52 shenzhen (integer) 2 127.0.0.1:6379> geoadd china:city 120.15 30.28 hangzhou 108.96 34.26 xian (integer) 2
geopos,获取城市的经纬度。
127.0.0.1:6379> geopos china:city beijing 1) 1) "116.39999896287918091" 2) "39.90000009167092543" 127.0.0.1:6379> geopos china:city beijing chongqing 1) 1) "116.39999896287918091" 2) "39.90000009167092543" 2) 1) "106.49999767541885376" 2) "29.52999957900659211"
geodist,查看北京到上海之间的距离。
127.0.0.1:6379> GEODIST china:city beijing shanghai km "1067.3788"
georadius,查找给定经纬度,给定半径内的城市。
127.0.0.1:6379> georadius china:city 110 30 1000 km 1) "chongqing" 2) "xian" 3) "shenzhen" 4) "hangzhou"
count参数,查看指定数量的城市。
127.0.0.1:6379> georadius china:city 110 30 500 km withcoord count 1 1) 1) "chongqing" 2) 1) "106.49999767541885376" 2) "29.52999957900659211"
GEORADIUSBYMEMBER,以城市为中心,给定半径,找出指定半径内的其它城市。
127.0.0.1:6379> GEORADIUSBYMEMBER china:city beijing 1000 km 1) "beijing" 2) "xian" 127.0.0.1:6379> GEORADIUSBYMEMBER china:city shanghai 400 km 1) "hangzhou" 2) "shanghai"
geohash,返回编码后的11位字符串
127.0.0.1:6379> geohash china:city beijing shanghai 1) "wx4fbxxfke0" 2) "wtw3sj5zbj0"
zrange,可以查看geo数据类型,key值中,的所有元素。
127.0.0.1:6379> zrange china:city 0 -1 1) "chongqing" 2) "xian" 3) "shenzhen" 4) "hangzhou" 5) "shanghai" 6) "beijing"
zrem,移除key中,指定的元素。
127.0.0.1:6379> zrem china:city beijing (integer) 1 127.0.0.1:6379> zrange china:city 0 -1 1) "chongqing" 2) "xian" 3) "shenzhen" 4) "hangzhou" 5) "shanghai"
用途:用作网页的UA技算(一个人访问网站多次,还算作一个人)。
PFADD,向key中添加数据。
127.0.0.1:6379> PFADD myset a b c d e f g h i j (integer) 1
pfcount,计算key中元素的个数。
127.0.0.1:6379> pfcount myset (integer) 10
PFMERGE,合并两个key(去重合并)
127.0.0.1:6379> PFADD myset a b c d e f g h i j (integer) 1 127.0.0.1:6379> pfcount mykey (integer) 0 127.0.0.1:6379> pfcount myset (integer) 10 127.0.0.1:6379> PFADD myset2 i j l m n x z y (integer) 1 127.0.0.1:6379> PFMERGE myset3 myset myset2 #将myset,myset2合并后存放到myset3中,求并集 OK 127.0.0.1:6379> PFCOUNT myset3 (integer) 16
Bitmaps,位图,也是一种数据结构。操作二进制来进行记录,只有0和1两种状态。
位存储
统计用户信息。登录、未登录,打卡、未打卡信息。
使用bitmap记录一周的打卡信息。值为0代表未打卡,值为1代表已打卡。
127.0.0.1:6379> setbit sign 0 1 (integer) 0 127.0.0.1:6379> setbit sign 1 0 (integer) 0 127.0.0.1:6379> setbit sign 2 0 (integer) 0 127.0.0.1:6379> setbit sign 3 1 (integer) 0 127.0.0.1:6379> setbit sign 4 1 (integer) 0 127.0.0.1:6379> setbit sign 5 1 (integer) 0 127.0.0.1:6379> setbit sign 6 0 (integer) 0
获取某一天的打卡信息。
127.0.0.1:6379> getbit sign 4 (integer) 1
统计打卡的总天数
127.0.0.1:6379> bitcount sign (integer) 4