hbase4

1.删除info列族，建表后
alter ‘table’ , ‘delete’ => ‘info’

2.增加info列族，建表后
alter ‘table’ , ‘name’ => ‘info’

3.添加数据
put ‘user’ , ‘row1’ , ‘info:name’ , ‘san’
put ‘user’ , ‘row2’ , ‘info:age’ , ‘20’
put ‘user’ , ‘row3’ , ‘info:sex’ , ‘man’

4.数据的更新
put ‘user’ , ‘row1’ , ‘info:name’ , ‘张三’

5.范围查询
数据量大的时候，尽量不要用scan查询数据，用get
get ‘table’ ,‘rowkey’ , … //写到rowkey就能查了
scan ‘user’ , {limit=>5}

//startrow,stoprow 区间：前闭后开 （含头不含尾）
scan ‘user’ {startrow=>‘row2’}
scan ‘user’ {startrow=>‘row2’,endrow=>‘row2’}
scan ‘user’ {startrow=>‘row2’,endrow=>‘row3’}

6.count
count ‘table’ , {interval=>intervalNum,CACHE=>cacheNum}
//interval设置多少行显示一次及对应的rowkey，默认1000
//CACHE每次去取的缓存区大小，默认是10，调整该参数可提高查询速度

count ‘user’

7.删除列
delete ‘user’ , ‘row1’ , ‘info:age’

8.指定rowkey删除
deleteall ‘user’ , ‘row2’

9.删除表中所有数据
truncate ‘user’

10.禁用表
disable ‘user’

describe ‘user’

11.启用表
enable ‘user’

12.测试表是否存在
exists ‘user’

13.删除表之前，必须先disable，不然删除不了表
disable ‘user’
drop ‘user’

14.查看所有表
list