Hbase shell 操作记录

查看hbase版本

hbase(main):002:0> version
2.1.0-cdh6.2.0, rUnknown, Wed Mar 13 23:39:58 PDT 2019
Took 0.0003 seconds

Hbase表空间概念

1、介绍

在HBase中，namespace命名空间指对一组表的逻辑分组，类似RDBMS中的database，方便对表在业务上划分。Apache HBase从0.98.0, 0.95.2两个版本开始支持namespace级别的授权操作，HBase全局管理员可以创建、修改和回收namespace的授权。

2、namespace

HBase系统默认定义了两个缺省的namespace

hbase：系统内建表，包括namespace和meta表

default：用户建表时未指定namespace的表都创建在此

hbase 查看命名空间

hbase(main):001:0> list_namespace
NAMESPACE
default
hbase
2 row(s)
Took 0.5695 seconds

创建表空间

hbase(main):005:0> create_namespace 'grady'
Took 0.5849 seconds

hbase(main):006:0> list_namespace
NAMESPACE
default
grady
hbase
3 row(s)
Took 0.0123 seconds

在表空间下创建表

create 'table_name', 'family1', 'family2', 'familyN'

表至少要包含一个列簇

hbase(main):008:0> create 'grady:student'

ERROR: Table must have at least one column family

For usage try 'help "create"'

Took 0.0117 seconds

正确例子

hbase(main):010:0> create 'grady:student', 'colfam01'
Created table grady:student
Took 2.5297 seconds
=> Hbase::Table - grady:student

查看命名空间下的表

hbase(main):011:0> list_namespace_tables 'grady'
TABLE
student
1 row(s)
Took 0.0289 seconds
=> ["student"]

列出所有表

hbase(main):012:0> list
TABLE
grady:student
1 row(s)
Took 0.0291 seconds
=> ["grady:student"]

删除命名空间

drop_namespace 'grady'

禁用表

disable 'grady:student'

启用表

enable ‘grady:student’

表是否启动或者禁用

is_enabled 'table1'

is_disabled 'table1'

删除表(先禁用再删除)

disable 'grady:student'
drop 'grady:student'

获取表描述信息

hbase(main):015:0> describe 'grady:student'
Table grady:student is ENABLED
grady:student
COLUMN FAMILIES DESCRIPTION
{NAME => 'colfam01', VERSIONS => '1', EVICT_BLOCKS_ON_CLOSE => 'false', NEW_VERSION_BEHAVIOR => 'false', KEEP_DELETED_CELLS => 'FALSE
', CACHE_DATA_ON_WRITE => 'false', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', MIN_VERSIONS => '0', REPLICATION_SCOPE => '0', BL
OOMFILTER => 'ROW', CACHE_INDEX_ON_WRITE => 'false', IN_MEMORY => 'false', CACHE_BLOOMS_ON_WRITE => 'false', PREFETCH_BLOCKS_ON_OPEN
=> 'false', COMPRESSION => 'NONE', BLOCKCACHE => 'true', BLOCKSIZE => '65536'}
1 row(s)
Took 0.2017 seconds

dml 数据操作

插入数据

put  'grady:student' ,  'jiang' ,  'colfam01:age' ,  '24'
put  'grady:student' ,  'jiang' ,  'colfam01:city' ,  'wuhan'

全表数据扫描

hbase(main):020:0> scan 'grady:student'
ROW                                COLUMN+CELL
 jiang                             column=colfam01:age, timestamp=1643384572444, value=24
 jiang                             column=colfam01:city, timestamp=1643384598828, value=wuhan
1 row(s)
Took 0.0072 seconds

获得一行所有的数据（根据rowkey）

hbase(main):023:0> get 'grady:student', 'jiang'
COLUMN                             CELL
 colfam01:age                      timestamp=1643384572444, value=24
 colfam01:city                     timestamp=1643384598828, value=wuhan
1 row(s)
Took 0.0684 seconds

获取某一行某一列簇的数据

hbase(main):025:0> get 'grady:student', 'jiang', 'colfam01'
COLUMN                             CELL
 colfam01:age                      timestamp=1643384572444, value=24
 colfam01:city                     timestamp=1643384598828, value=wuhan
1 row(s)
Took 0.0064 seconds

获取某一行某一列的数据

hbase(main):024:0> get 'grady:student', 'jiang', 'colfam01:city'
COLUMN                             CELL
 colfam01:city                     timestamp=1643384598828, value=wuhan
1 row(s)
Took 0.0197 seconds

更新某一行某一列的数据

hbase(main):026:0> put  'grady:student' ,  'jiang' ,  'colfam01:city' ,  'wuhan-hongshan'
Took 0.0102 seconds  

hbase(main):027:0> scan 'grady:student'
ROW                                COLUMN+CELL
 jiang                             column=colfam01:age, timestamp=1643384572444, value=24
 jiang                             column=colfam01:city, timestamp=1643385119877, value=wuhan-hongshan
1 row(s)
Took 0.0073 seconds

查询表中数据量

hbase(main):028:0> count 'grady:student'
1 row(s)
Took 0.0434 seconds
=> 1

清空表

truncate 'member'

删除某行的某一列的数据

先插入chen的数据
hbase(main):029:0> put  'grady:student' ,  'chen' ,  'colfam01:city' ,  'wuhan-hongshan'
Took 0.0097 seconds
hbase(main):030:0> put  'grady:student' ,  'chen' ,  'colfam01:age' ,  '25'
Took 0.0116 seconds
hbase(main):031:0> scan 'grady:student'
ROW                                COLUMN+CELL
 chen                              column=colfam01:age, timestamp=1643385532711, value=25
 chen                              column=colfam01:city, timestamp=1643385510256, value=wuhan-hongshan
 jiang                             column=colfam01:age, timestamp=1643384572444, value=24
 jiang                             column=colfam01:city, timestamp=1643385119877, value=wuhan-hongshan

hbase(main):032:0> delete 'grady:student', 'chen', 'colfam01:age'
Took 0.0094 seconds

删除整行数据

hbase(main):006:0> deleteall 'grady:student', 'chen'
Took 0.0642 seconds

表结构修改

新增列簇

alter 'grady:student',  'cf2'

删除列簇

alter 'grady:student', 'delete' => 'cf2'

Hbase 使用LIMIT查询前10条数据

scan 'test-table', {'LIMIT' => 10}

参考：

https://blog.csdn.net/kangkangwanwan/article/details/60960731