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Hbase介绍四(shell命令)

下面我们看看HbaseShell的一些基本操作命令,我列出了几个常用的HbaseShell命令,如下:

名称

命令表达式

创建表

create '表名称', '列名称1','列名称2','列名称N'

添加记录

put '表名称', '行名称', '列名称:', '值'

查看记录

get '表名称', '行名称'

查看表中的记录总数

count '表名称'

删除记录

delete '表名' ,'行名称' , '列名称'

删除一张表

先要屏蔽该表,才能对该表进行删除,第一步 disable '表名称' 第二步 drop '表名称'

查看所有记录

scan "表名称"

查看某个表某个列中所有数据

scan "表名称" , ['列名称:']

更新记录

就是重写一遍进行覆盖

下面是一些常见命令的说明,在hbaseshell中输入help的帮助信息,在本文中,我们先介绍前3个,后面2个,将在下一篇博文中介绍。

COMMAND GROUPS:

Group name: general

Commands: status, version

Group name: ddl

Commands: alter, create, describe, disable,drop, enable, exists, is_disabled, is_enabled, list

Group name: dml

Commands: count, delete, deleteall, get,get_counter, incr, put, scan, truncate

Group name: tools

Commands: assign, balance_switch, balancer,close_region, compact, flush, major_compact, move, split, unassign, zk_dump

Group name: replication

Commands: add_peer, disable_peer,enable_peer, remove_peer, start_replication, stop_replication

一、一般操作

1.查询服务器状态

hbase(main):024:0>status

3 servers, 0 dead,1.0000 average load

2.查询Hive版本

hbase(main):025:0>version

0.90.4, r1150278,Sun Jul 24 15:53:29 PDT 2011

二、DDL操作

1.创建一个表

hbase(main):011:0>create 'member','member_id','address','info'

0 row(s) in 1.2210seconds

2.获得表的描述

hbase(main):012:0>list

TABLE

member

1 row(s) in 0.0160seconds

hbase(main):006:0>describe 'member'

DESCRIPTIONENABLED

{NAME => 'member', FAMILIES => [{NAME=> 'address', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', true

VERSIONS => '3', COMPRESSION => 'NONE',TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'fa

lse', BLOCKCACHE => 'true'}, {NAME =>'info', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', VERSI

ONS => '3', COMPRESSION => 'NONE', TTL=> '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false',

BLOCKCACHE => 'true'}]}

1 row(s) in 0.0230seconds

3.删除一个列族,alter,disable,enable

我们之前建了3个列族,但是发现member_id这个列族是多余的,因为他就是主键,所以我们要将其删除。

hbase(main):003:0>alter 'member',{NAME=>'member_id',METHOD=>'delete'}

ERROR: Table memberis enabled. Disable it first before altering.

报错,删除列族的时候必须先将表给disable掉。

hbase(main):004:0>disable 'member'

0 row(s) in 2.0390seconds

hbase(main):005:0>alter'member',{NAME=>'member_id',METHOD=>'delete'}

0 row(s) in 0.0560seconds

hbase(main):006:0>describe 'member'

DESCRIPTIONENABLED

{NAME => 'member', FAMILIES => [{NAME=> 'address', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0',false

VERSIONS => '3', COMPRESSION => 'NONE',TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'fa

lse', BLOCKCACHE => 'true'}, {NAME =>'info', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', VERSI

ONS => '3', COMPRESSION => 'NONE', TTL=> '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false',

BLOCKCACHE => 'true'}]}

1 row(s) in 0.0230seconds

该列族已经删除,我们继续将表enable

hbase(main):008:0> enable 'member'

0 row(s) in 2.0420seconds

4.列出所有的表

hbase(main):028:0>list

TABLE

member

temp_table

2 row(s) in 0.0150seconds

5.drop一个表

hbase(main):029:0>disable 'temp_table'

0 row(s) in 2.0590seconds

hbase(main):030:0>drop 'temp_table'

0 row(s) in 1.1070seconds

6.查询表是否存在

hbase(main):021:0>exists 'member'

Table member doesexist

0 row(s) in 0.1610seconds

7.判断表是否enable

hbase(main):034:0>is_enabled 'member'

true

0 row(s) in 0.0110seconds

8.判断表是否disable

hbase(main):032:0>is_disabled 'member'

false

0 row(s) in 0.0110seconds

三、DML操作

1.插入几条记录

put'member','scutshuxue','info:age','24'

put'member','scutshuxue','info:birthday','1987-06-17'

put'member','scutshuxue','info:company','alibaba'

put'member','scutshuxue','address:contry','china'

put'member','scutshuxue','address:province','zhejiang'

put'member','scutshuxue','address:city','hangzhou'

put'member','xiaofeng','info:birthday','1987-4-17'

put'member','xiaofeng','info:favorite','movie'

put'member','xiaofeng','info:company','alibaba'

put'member','xiaofeng','address:contry','china'

put'member','xiaofeng','address:province','guangdong'

put'member','xiaofeng','address:city','jieyang'

put'member','xiaofeng','address:town','xianqiao'

2.获取一条数据

获取一个id的所有数据

hbase(main):001:0>get 'member','scutshuxue'

COLUMN CELL

address:citytimestamp=1321586240244, value=hangzhou

address:contrytimestamp=1321586239126, value=china

address:provincetimestamp=1321586239197, value=zhejiang

info:agetimestamp=1321586238965, value=24

info:birthdaytimestamp=1321586239015, value=1987-06-17

info:companytimestamp=1321586239071, value=alibaba

6 row(s) in 0.4720seconds

获取一个id,一个列族的所有数据

hbase(main):002:0>get 'member','scutshuxue','info'

COLUMN CELL

info:agetimestamp=1321586238965, value=24

info:birthdaytimestamp=1321586239015, value=1987-06-17

info:companytimestamp=1321586239071, value=alibaba

3 row(s) in 0.0210seconds

获取一个id,一个列族中一个列的所有数据

hbase(main):002:0>get 'member','scutshuxue','info:age'

COLUMN CELL

info:agetimestamp=1321586238965, value=24

1 row(s) in 0.0320seconds

6.更新一条记录

将scutshuxue的年龄改成99

hbase(main):004:0>put 'member','scutshuxue','info:age' ,'99'

0 row(s) in 0.0210seconds

hbase(main):005:0>get 'member','scutshuxue','info:age'

COLUMN CELL

info:agetimestamp=1321586571843, value=99

1 row(s) in 0.0180seconds

3.通过timestamp来获取两个版本的数据

hbase(main):010:0>get 'member','scutshuxue',{COLUMN=>'info:age',TIMESTAMP=>1321586238965}

COLUMN CELL

info:agetimestamp=1321586238965, value=24

1 row(s) in 0.0140seconds

hbase(main):011:0>get 'member','scutshuxue',{COLUMN=>'info:age',TIMESTAMP=>1321586571843}

COLUMN CELL

info:agetimestamp=1321586571843, value=99

1 row(s) in 0.0180seconds

4.全表扫描:

hbase(main):013:0>scan 'member'

ROWCOLUMN+CELL

scutshuxuecolumn=address:city, timestamp=1321586240244, value=hangzhou

scutshuxuecolumn=address:contry, timestamp=1321586239126, value=china

scutshuxuecolumn=address:province, timestamp=1321586239197, value=zhejiang

scutshuxue column=info:age,timestamp=1321586571843, value=99

scutshuxuecolumn=info:birthday, timestamp=1321586239015, value=1987-06-17

scutshuxuecolumn=info:company, timestamp=1321586239071, value=alibaba

tempcolumn=info:age, timestamp=1321589609775, value=59

xiaofengcolumn=address:city, timestamp=1321586248400, value=jieyang

xiaofengcolumn=address:contry, timestamp=1321586248316, value=china

xiaofengcolumn=address:province, timestamp=1321586248355, value=guangdong

xiaofengcolumn=address:town, timestamp=1321586249564, value=xianqiao

xiaofengcolumn=info:birthday, timestamp=1321586248202, value=1987-4-17

xiaofengcolumn=info:company, timestamp=1321586248277, value=alibaba

xiaofengcolumn=info:favorite, timestamp=1321586248241, value=movie

3 row(s) in 0.0570seconds

5.删除id为temp的值的‘info:age’字段

hbase(main):016:0>delete 'member','temp','info:age'

0 row(s) in 0.0150seconds

hbase(main):018:0>get 'member','temp'

COLUMN CELL

0 row(s) in 0.0150seconds

6.删除整行

hbase(main):001:0>deleteall 'member','xiaofeng'

0 row(s) in 0.3990seconds

7.查询表中有多少行:

hbase(main):019:0>count 'member'

2 row(s) in 0.0160seconds

8.给‘xiaofeng’这个id增加'info:age'字段,并使用counter实现递增

hbase(main):057:0*incr 'member','xiaofeng','info:age'

COUNTER VALUE = 1

hbase(main):058:0>get 'member','xiaofeng','info:age'

COLUMN CELL

info:agetimestamp=1321590997648, value=\x00\x00\x00\x00\x00\x00\x00\x01

1 row(s) in 0.0140seconds

hbase(main):059:0>incr 'member','xiaofeng','info:age'

COUNTER VALUE = 2

hbase(main):060:0>get 'member','xiaofeng','info:age'

COLUMN CELL

info:agetimestamp=1321591025110, value=\x00\x00\x00\x00\x00\x00\x00\x02

1 row(s) in 0.0160seconds

获取当前count的值

hbase(main):069:0>get_counter 'member','xiaofeng','info:age'

COUNTER VALUE = 2

9.将整张表清空:

hbase(main):035:0>truncate 'member'

Truncating 'member'table (it may take a while):

- Disabling table...

- Dropping table...

- Creating table...

0 row(s) in 4.3430seconds

可以看出,hbase是先将掉disable掉,然后drop掉后重建表来实现truncate的功能的。