Basic operation commands of HBase

1. Basic operation commands

command	meaning	Instance
status	Display state	status ‘hadoop1’
whoami	Display current users of HBase	whoami
list	Show all current tables	list
count	Count the number of records in the specified table	count ‘user’
describe	Display table structure information	describe ‘user’
exists	Check if the table exists	exists ‘user’
is_enabled/is_disabled	Check if the table is enabled/disabled	is_enabled ‘user’
alter	Change the mode of a table or column family	alter ‘user’, NAME => ‘CF2’, VERSIONS => 2
disable/enable	Enable/disable a table	disable ‘user’
drop	Delete table	drop ‘user’
truncate	Disable table	trancate ‘user’

Open the HBase shell

cd /export/servers/hbase-2.0.0
bin/hbase shell

Create table, add data

# 创建表
create 'user', 'info', 'data'

# 向user表中插入信息，row key为rk0001，列族info中添加name列标示符，值为zhangsan
put 'user', 'rk0001', 'info:name', 'zhangsan'
# 向user表中插入信息，row key为rk0001，列族info中添加gender列标示符，值为female
put 'user', 'rk0001', 'info:gender', 'female'
# 向user表中插入信息，row key为rk0001，列族info中添加age列标示符，值为20
put 'user', 'rk0001', 'info:age', 20
# 向user表中插入信息，row key为rk0001，列族data中添加pic列标示符，值为picture
put 'user', 'rk0001', 'data:pic', 'picture'

How many rows of data are counted
```
count 'user'
```

2. Query operation

Query by get (get rowkey)

# 获取user表中row key为rk0001的所有信息
get 'user', 'rk0001'

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# 获取user表中row key为rk0001，info列族的信息
get 'user', 'rk0001', 'info'

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# 获取user表中row key为rk0001，info列族的name、age列标示符的信息
get 'user', 'rk0001', 'info:name', 'info:age'

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# 获取user表中row key为rk0001，info、data列族的信息， 两种写法
get 'user', 'rk0001', 'info', 'data'
get 'user', 'rk0001', {
      
      COLUMN => ['info', 'data']}

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#获取user表中row key为rk0001，cell的值为zhangsan的信息
get 'user', 'rk0001', {
      
      FILTER => "ValueFilter(=, 'binary:zhangsan')"}

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# 获取user表中row key为rk0001，列标示符中含有a的信息
get 'user', 'rk0001', {
      
      FILTER => "(QualifierFilter(=,'substring:a'))"}

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Query by scan (scan condition)

get can not get all the information in the table, to get all the information in the table, you need to pass scan

# 查询user表中的所有信息
scan 'user'

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# 查询user表中列族为info的信息
scan 'user', {
      
      COLUMNS => 'info'}

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# 查询user表中列族为info和data的信息
scan 'user', {
      
      COLUMNS => ['info', 'data']}
# 查询user表中列族为info列为name和列族为data列为pic的信息
scan 'user', {
      
      COLUMNS => ['info:name', 'data:pic']}

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# 查询user表中列族为info、列标示符为name的信息,并且版本最新的5个
scan 'user', {
      
      COLUMNS => ['info', 'data'], FILTER => "(QualifierFilter(=,'substring:a'))"}

# 查询user表中列族为info，rk范围是[rk0001, rk0003)的数据
scan 'user', {
      
      COLUMNS => 'info', STARTROW => 'rk0001', ENDROW => 'rk0003'}

# 查询user表中row key以rk字符开头的
scan 'user',{
      
      FILTER=>"PrefixFilter('rk')"}

# 查询user表中指定范围的数据
scan 'user', {
      
      TIMERANGE => [1582873430274, 1582873430774]}

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3. Update operation

Update data: The operation is the same as inserting

updated version

# 将user表的f1列族版本号改为5
alter 'user', NAME => 'info', VERSIONS => 5

4. Delete operation

Specify rowkey and column name to delete

# 删除user表row key为rk0001，列标示符为info:name的数据
delete 'user', 'rk0001', 'info:name'

scan 'user'

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Specify rowkey, column name and field value to delete

# 删除user表row key为rk0001，列标示符为data:pic，timestamp为1392383705316的数据
delete 'user', 'rk0001', 'data:pic', 1582873430274

Delete a column family

alter 'user', NAME => 'info', METHOD => 'delete' 
或 alter 'user', 'delete' => 'info'

Clear table data
```
truncate 'user'
scan 'user'
```

Delete table

# 首先需要先让该表为disable状态
disable 'user'
# 删除表
drop 'user'

list

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