一、 HBase Shell操作
1.1 基本操作
1
.进入HBase客户端命令行
[@hadoop102 hbase]$ bin/hbase shell
2
.查看帮助命令
hbase(main):001:0> help
3
.查看当前数据库中有哪些表
hbase(main):002:0> list
1.2 表的操作
1
.创建表
hbase(main):002:0> create 'student','info'
2
.插入数据到表
hbase(main):003:0> put 'student','1001','info:sex','male'
hbase(main):004:0> put 'student','1001','info:age','18'
hbase(main):005:0> put 'student','1002','info:name','Janna'
hbase(main):006:0> put 'student','1002','info:sex','female'
hbase(main):007:0> put 'student','1002','info:age','20'
3
.扫描查看表数据
hbase(main):008:0> scan 'student'
查询前几条数据
scan 'student',{LIMIT=>5}
hbase(main):009:0> scan 'student',{STARTROW => '1001', STOPROW => '1001'}
hbase(main):010:0> scan 'student',{STARTROW => '1001'}
4
.查看表结构
hbase(main):011:0> describe 'student'
hbase(main):011:0> desc 'student'
5
.更新指定字段的数据
hbase(main):012:0> put 'student','1001','info:name','Nick'
hbase(main):013:0> put 'student','1001','info:age','100'
6
.查看“指定行”或“指定列族:列”的数据
hbase(main):014:0> get 'student','1001'
hbase(main):015:0> get 'student','1001','info:name'
7
.统计表数据行数
hbase(main):021:0> count 'student'
8
.删除数据
删除某rowkey的全部数据:
hbase(main):016:0> deleteall 'student','1001'
删除某rowkey的某一列数据:
hbase(main):017:0> delete 'student','1002','info:sex'
9
.清空表数据
hbase(main):018:0> truncate 'student'
提示:
清空表的操作顺序为先disable,然后再truncate。
10
.删除表
首先需要先让该表为disable状态:
hbase(main):019:0> disable 'student'
然后才能drop这个表:
hbase(main):020:0> drop 'student'
提示:
如果直接drop表,会报错:ERROR: Table student is enabled. Disable it first.
11
.变更表信息
将info列族中的数据存放3个版本:
hbase(main):022:0> alter 'student',{NAME=>'info',VERSIONS=>3}
hbase(main):022:0> get 'student','1001',{COLUMN=>'info:name',VERSIONS=>3}