Redis数据类型之字符串命令

你的名字 2021-07-24 14:42 653阅读 0赞

**一 SET命令——设置健值对**

127.0.0.1:6379> SET stuName-1 'liuhefei'
    OK
    127.0.0.1:6379> SET stuID 20180001
    OK
    127.0.0.1:6379> SET age-1 32
    OK
    127.0.0.1:6379> SET sex-1 'nan'
    OK
    127.0.0.1:6379> SET heith-1 171
    OK
    127.0.0.1:6379> SET weight-1 75
    OK
    127.0.0.1:6379> SET birthday-1 1996-02-14
    OK
    127.0.0.1:6379> SET className-1 'ruanjiangogncheng1ban'
    OK

**二 MSET命令：设置多个健值对**

127.0.0.1:6379> MSET stuName-2 'zhaoyumei' stuID-2 20181762 age-2 24 sex-2 'lv' heitht-2 175 weight-2 73 birthday-2 1994-04-23 className-2 'wangluogongcheng1ban'
    OK
    127.0.0.1:6379> MSET stuName-3 'afei' stuID-3 20181763 age-3 25 sex-3 'nan' heitht-3 173 weight-3 73 birthday-3 1994-04-23 className-3 'wangluogongcheng2ban'
    OK

**三 SETNX命令：设置不存在的键**

127.0.0.1:6379> SETNX collegaName 'computer'
    1
    127.0.0.1:6379> SETNX collegaName 'computer2'
    0

**四 MSETNX命令：设置多个不存在的健值对**

127.0.0.1:6379> MSETNX chine-teacher 'guotao' math-teacher 'yangyan'
    1
    127.0.0.1:6379> MSETNX chine-teacher 'chenchn' math-teacher 'zhangsi'
    0

**五 GET命令：获取健值对的值**

127.0.0.1:6379> GET stuName-1
    liuhefei
    127.0.0.1:6379> GET stuID
    20180001
    127.0.0.1:6379> GET age-1
    32
    127.0.0.1:6379> GET sex-1
    nan
    127.0.0.1:6379> GET heith-1
    171
    127.0.0.1:6379> GET weight-1
    75
    127.0.0.1:6379> GET birthday-1
    1996-02-14
    127.0.0.1:6379> GET className-1
    ruanjiangogncheng1ban

**六 MGET命令：获取多个健值对的值**

127.0.0.1:6379> MGET stuName-1 stuID age-1 sex-1 heith-1 weight-1 birthday-1 className-1
    liuhefei
    20180001
    32
    nan
    171
    75
    1996-02-14
    ruanjiangogncheng1ban
    127.0.0.1:6379> MGET stuName-1 stuName-2
    liuhefei
    zhaoyumei

**七 GETRANGE命令：获取键的子字符串值**

127.0.0.1:6379> SET motto-2 'yigerenzhiyouquanmianhuiyizijicainengrenzhiziji'
    OK
    127.0.0.1:6379> GETRANGE motto-2 0 100
    yigerenzhiyouquanmianhuiyizijicainengrenzhiziji
    127.0.0.1:6379> GETRANGE motto-2 -8 -1
    nzhiziji
    127.0.0.1:6379> GETRANGE motto-2 0 -3
    yigerenzhiyouquanmianhuiyizijicainengrenzhizi
    127.0.0.1:6379> GETRANGE motto-2 0 -5
    yigerenzhiyouquanmianhuiyizijicainengrenzhi

**八 SETBIT命令：设置键的偏移量**

127.0.0.1:6379> SETBIT stuName-1 6 1
    0
    127.0.0.1:6379> SETBIT stuName-1 7 0
    0
    127.0.0.1:6379> SETBIT stuName-1 100 0
    0

**九 GETBIT命令：获取键的偏移值**

127.0.0.1:6379> GETBIT stuName-1 6
    1
    127.0.0.1:6379> GETBIT stuName-1 7
    0
    127.0.0.1:6379> GETBIT stuName-1 100
    0
    127.0.0.1:6379> GET stuName-2
    zhaoyumei
    127.0.0.1:6379> SETBIT stuName-2 1 0             # 这里可以看出SETBIT的作用  z的ASCII为0111 1010 ，当把第1位修改为0后，就变成了0011 1010，也就是：对应的ASCII
    1
    127.0.0.1:6379> GET stuName-2
    :haoyumei

**十 SETEX命令：为键设置生存时间（秒）**

127.0.0.1:6379> SETEX schoolName 100 'qinghuadaxue'
    OK
    127.0.0.1:6379> GET schoolName
    qinghuadaxue
    127.0.0.1:6379> TTL schoolName
    84
    127.0.0.1:6379> GET schoolName            # 84秒后查看，健值为空

**十一 PSETEX命令：为键设置生存时间（毫秒）**

127.0.0.1:6379> PSETEX school-address 30000 'beijin'
    OK
    127.0.0.1:6379> GET school-address
    beijin
    127.0.0.1:6379> TTL school-address
    2
    127.0.0.1:6379> GET school-address     # 2毫秒后查看，键值为空

**十二 SETRANGE命令：替换键的值**

127.0.0.1:6379> GET motto-2
    yigerenzhiyouquanmianhuiyizijicainengrenzhiziji
    127.0.0.1:6379> SETRANGE motto-2 1 'ee'
    47
    127.0.0.1:6379> GET motto-2
    yeeerenzhiyouquanmianhuiyizijicainengrenzhiziji

**十三 GETSET命令：为键设置新值**

127.0.0.1:6379> EXISTS motto-1
    0
    127.0.0.1:6379> GETSET motto-1 'meiyou cunkuangjiu shi pingdeliyou'
    
    
    127.0.0.1:6379> GET motto-1
    meiyou cunkuangjiu shi pingdeliyou
    127.0.0.1:6379> GETSET motto-1 'pinggechunxiaqiudongyinge wurenshen'
    meiyou cunkuangjiu shi pingdeliyou
    127.0.0.1:6379> GET motto-1
    pinggechunxiaqiudongyinge wurenshen

**十四 APPEND命令：为键追加值**

127.0.0.1:6379> GET motto-1
    pinggechunxiaqiudongyinge wurenshen
    127.0.0.1:6379> APPEND motto-1 'nuliguo'
    42
    127.0.0.1:6379> GET motto-1
    pinggechunxiaqiudongyinge wurenshennuliguo
    127.0.0.1:6379> APPEND motto-1 'cishengwuhui'
    54
    127.0.0.1:6379> GET motto-1
    pinggechunxiaqiudongyinge wurenshennuliguocishengwuhui

**十五 BITCOUNT命令：计算比特位的数量**

127.0.0.1:6379> GET stuName-2
    :haoyumei
    127.0.0.1:6379> BITCOUNT stuName-2
    39
    127.0.0.1:6379> BITCOUNT stuName-2 1 1          # h的ASCII码为 0110 1000，有3个BIT
    3
    127.0.0.1:6379> SETBIT stuName-2 100 1
    0
    127.0.0.1:6379> BITCOUNT stuName-2
    40

**十六 BITOP命令：对键进行位元运算**

127.0.0.1:6379> SETBIT age-1 0 1
    0
    127.0.0.1:6379> SETBIT age-2 3 1
    1
    127.0.0.1:6379> BITOP AND result age-1 age-2
    2
    127.0.0.1:6379> GET result
    20
    127.0.0.1:6379> BITOP OR result age-1 age-2
    2
    127.0.0.1:6379> GET result
    ?
    127.0.0.1:6379> BITOP NOT result3 age-1
    2
    127.0.0.1:6379> GET result3
    L?
    127.0.0.1:6379> BITOP NOT result4 age-2
    2
    127.0.0.1:6379> GET result4
    退

**十七 STRLEN命令：统计键的值的字符长度**

127.0.0.1:6379> GET motto-1
    pinggechunxiaqiudongyinge wurenshennuliguocishengwuhui
    127.0.0.1:6379> STRLEN motto-1
    54
    127.0.0.1:6379> GET motto-2
    yeeerenzhiyouquanmianhuiyizijicainengrenzhiziji
    127.0.0.1:6379> STRLEN motto-2
    47

**十八 DECR命令：让键的值减1**

127.0.0.1:6379> MGET stuName-3 age-3 heitht-3 weight-3
    afei
    25
    173
    73
    127.0.0.1:6379> DECR age-3
    24
    127.0.0.1:6379> DECR heitht-3
    172
    127.0.0.1:6379> DECR weight-3
    72

**十九 DECRBY命令：键的值减去减量值**

127.0.0.1:6379> MGET stuName-3 age-3 heitht-3 weight-3
    afei
    24
    172
    72
    127.0.0.1:6379> DECRBY age-3 5
    19
    127.0.0.1:6379> DECRBY heitht-3 5
    167
    127.0.0.1:6379> DECRBY weight-3 5
    67

**二十 INCR命令：让键的值加1**

127.0.0.1:6379> MGET stuName-3 age-3 heitht-3 weight-3
    afei
    19
    167
    67
    127.0.0.1:6379> INCR age-3
    20
    127.0.0.1:6379> INCR heitht-3
    168
    127.0.0.1:6379> INCR weight-3
    68

**二十一 INCRBY命令：让键的值加上增量值**

127.0.0.1:6379> MGET stuName-3 age-3 heitht-3 weight-3
    afei
    20
    168
    68
    127.0.0.1:6379> INCRBY age-3 5
    25
    127.0.0.1:6379> INCRBY heitht-3 5
    173
    127.0.0.1:6379> INCRBY weight-3 5
    73

**二十二 INCRBYFLOAT命令：让键的值加上浮点数增量值**

127.0.0.1:6379> INCRBY age-3 5
    25
    127.0.0.1:6379> INCRBY heitht-3 5
    173
    127.0.0.1:6379> INCRBY weight-3 5
    73
    127.0.0.1:6379> SET PI 3.1415
    OK
    127.0.0.1:6379> INCRBYFLOAT PI 0.002
    3.1435
    127.0.0.1:6379> SET PI-1 31415e-4
    OK
    127.0.0.1:6379> GET PI-1
    31415e-4
    127.0.0.1:6379> INCRBYFLOAT PI-1 0.0001
    3.1416
    127.0.0.1:6379> SET PI-2 314
    OK
    127.0.0.1:6379> INCRBYFLOAT PI-2 0.15
    314.14999999999998
    127.0.0.1:6379> SET PI-3 314.0
    OK
    127.0.0.1:6379> INCRBYFLOAT PI-3 1.0000000000
    315