由于学习开发监控软件的需要，因此需要使用到Redis，这里简单介绍。
注意，使用的环境为：Ubuntu 15.10
1.安装
可以采用源码安装，也可以采用apt-get来安装，都比较简单。
2.启动
由于采用的是源码安装的方式，所以直接进入src目录，启动redis-server：
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xpleaf@xpleaf-machine:/mnt/hgfs/Python/day7/redis-
2.8
.
9
/src$ ./redis-server
[
12681
]
16
Oct
00
:
06
:
52.964
# Warning: no config file specified, using the
default
config. In order to specify a config file
use
./redis-server /path/to/redis.conf
[
12681
]
16
Oct
00
:
06
:
52.967
# You requested maxclients of
10000
requiring at least
10032
max file descriptors.
[
12681
]
16
Oct
00
:
06
:
52.968
# Redis can't
set
maximum open files to
10032
because of OS error: Operation not permitted.
[
12681
]
16
Oct
00
:
06
:
52.968
# Current maximum open files
is
1024
. maxclients has been reduced to
4064
to compensate
for
low ulimit. If you need higher maxclients increase
'ulimit -n'
.
_._
_.-``__
''
-._
_.-`` `. `_.
''
-._ Redis
2.8
.
9
(
00000000
/
0
)
64
bit
.-`` .-```. ```\/ _.,_
''
-._
( ' , .-` | `, ) Running
in
stand alone mode
|`-._`-...-` __...-.``-._|
'` _.-'
| Port:
6379
| `-._ `._ / _.-' | PID:
12681
`-._ `-._ `-./ _.-
' _.-'
|`-._`-._ `-.__.-
' _.-'
_.-'|
| `-._`-._ _.-
'_.-'
| http:
//redis.io
`-._ `-._`-.__.-
'_.-'
_.-'
|`-._`-._ `-.__.-
' _.-'
_.-'|
| `-._`-._ _.-
'_.-'
|
`-._ `-._`-.__.-
'_.-'
_.-'
`-._ `-.__.-
' _.-'
`-._ _.-'
`-.__.-'
[
12681
]
16
Oct
00
:
06
:
52.974
# Server started, Redis version
2.8
.
9
[
12681
]
16
Oct
00
:
06
:
52.974
# WARNING overcommit_memory
is
set
to
0
! Background save may fail under low memory condition. To fix
this
issue add
'vm.overcommit_memory = 1'
to /etc/sysctl.conf and then reboot or run the command
'sysctl vm.overcommit_memory=1'
for
this
to take effect.
[
12681
]
16
Oct
00
:
06
:
52.976
* DB loaded from disk:
0.002
seconds
[
12681
]
16
Oct
00
:
06
:
52.977
* The server
is
now ready to accept connections on port
6379
|
出现上面所示的提示，说明已经正常启动了redis。
3.交互式操作
进入src目录，运行redis-cli即可进入redis交互界面：
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xpleaf@xpleaf-machine:/mnt/hgfs/Python/day7/redis-
2.8
.
9
/src$ ./redis-cli
127.0
.
0.1
:
6379
>
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基本操作：
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#查看帮助
127.0
.
0.1
:
6379
> help
set
SET key value [EX seconds] [PX milliseconds] [NX|XX]
summary: Set the string value of a key
since:
1.0
.
0
group: string
#创建key-value
127.0
.
0.1
:
6379
>
set
name xpleaf
OK
#获得key对应的value
127.0
.
0.1
:
6379
>
get
name
"xpleaf"
#创建有时间的key-value
127.0
.
0.1
:
6379
>
set
name2 CL ex
5
OK
#创建列表
127.0
.
0.1
:
6379
> lpush stu_list xpleaf yonghaoye CL
(integer)
3
127.0
.
0.1
:
6379
> lpush stu_list CLYYH
(integer)
4
#获取列表内容
127.0
.
0.1
:
6379
> lrange stu_list
1
4
1
)
"CL"
2
)
"yonghaoye"
3
)
"xpleaf"
127.0
.
0.1
:
6379
> lrange stu_list
0
4
1
)
"CLYYH"
2
)
"CL"
3
)
"yonghaoye"
4
)
"xpleaf"
#删除key-value或其它数据类型
127.0
.
0.1
:
6379
> del name
(integer)
1
|
3.在Python交互器中使用redis
-
要使用Python来操作Redistribute，则需要安装Python与Redis通信的接口：
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apt-
get
install python-redis
|
-
在交互器中连接Redis数据库：
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>>>
import
redis
>>> r = redis.Redis(
'127.0.0.1'
, port=
6379
, db=
0
)
|
-
基本操作
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#查看所有的key
>>> r.keys()
[
'YourKey'
,
'stu_list'
,
'k1'
,
'k3'
]
#创建key-value
>>> r.
set
(
'xpleaf'
,
'xpleaf'
)
True
#获取key所对应的value
>>> r[
'xpleaf'
]
'xpleaf'
或
>>> r.
get
(
'xpleaf'
)
'xpleaf'
#保存Python中的字典到Redis数据库中
>>>
import
json
>>> myDict = {
'name'
:
'xpleaf'
,
'age'
:
21
,
'loving'
:
'cl'
}
>>> r[
'Py_myDict'
] = json.dumps(myDict)
>>>
>>> r[
'Py_myDict'
]
'{"age": 21, "name": "xpleaf", "loving": "cl"}'
#取出保存在Redis数据库中的Python字典
>>> a = json.loads(r[
'Py_myDict'
])
>>> a
{u
'age'
:
21
, u
'name'
: u
'xpleaf'
, u
'loving'
: u
'cl'
}
>>> a[
'name'
]
u
'xpleaf'
|
本文转自 xpleaf 51CTO博客，原文链接：http://blog.51cto.com/xpleaf/1703387，如需转载请自行联系原作者
