hbase shell学习-2

一个学生成绩表的例子来演示hbase的用法。

name	grade	course
math	english
Tom	5	97	87
Jim	4	89	80

表的创建：语法：create '表名称','列簇名称1','列簇名称2'........

create 'student','name','grade','course'

desc 'student'

结果：

{
    NAME=>'course',
    DATA_BLOCK_ENCODING=>'NONE',
    BLOOMFILTER=>'ROW',
    REPLICATION_SCOPE=>'0',
    VERSIONS=>'1',
    COMPRESSION=>'NONE',
    MIN_VERSIONS=>'0',
    TTL=>'FOREVER',
    KEEP_DELETED_CELLS=>'FALSE',
    BLOCKSIZE=>'65536',
    IN_MEMORY=>'false',
    BLOCKCACHE=>'true'
}{
    NAME=>'grade',
    DATA_BLOCK_ENCODING=>'NONE',
    BLOOMFILTER=>'ROW',
    REPLICATION_SCOPE=>'0',
    VERSIONS=>'1',
    COMPRESSION=>'NONE',
    MIN_VERSIONS=>'0',
    TTL=>'FOREVER',
    KEEP_DELETED_CELLS=>'FALSE',
    BLOCKSIZE=>'65536',
    IN_MEMORY=>'false',
    BLOCKCACHE=>'true'
}{
    NAME=>'name',
    DATA_BLOCK_ENCODING=>'NONE',
    BLOOMFILTER=>'ROW',
    REPLICATION_SCOPE=>'0',
    VERSIONS=>'1',
    COMPRESSION=>'NONE',
    MIN_VERSIONS=>'0',
    TTL=>'FOREVER',
    KEEP_DELETED_CELLS=>'FALSE',
    BLOCKSIZE=>'65536',
    IN_MEMORY=>'false',
    BLOCKCACHE=>'true'
}

新增列簇：

alter '表名称',NAME='列簇名称'

hbase(main):068:0> alter 'student',NAME=>'age'
Updating all regions with the new schema...
1/1 regions updated.

删除列簇：

alter '表名称',NAME=>'列簇名称',METHOD=>'delete'

 alter 'student',NAME=>'test',METHOD=>'delete'

删除一个表：之前，必须先将该表disable掉。

disable 'student'

drop 'student'

给表添加记录：

put '表名称'，'rowkey','列簇名称:列名称','值'

put 'student','001201509011001','name','Tom'

hbase(main):085:0> scan 'student'
ROW                           COLUMN+CELL
 001201509011001              column=name:, timestamp=1447766388162, value=Tom
1 row(s) in 0.0090 seconds

继续执行：name列簇的value='jim'，但是rowkey 不变，

hbase(main):086:0> put 'student','001201509011001','name','Jim'

结果还是一条数据，001201509011001的rowkey，被第二条数据覆盖。

scan 'student'
ROW                           COLUMN+CELL
 001201509011001              column=name:, timestamp=1447766492893, value=Jim

put 'student','001201509011001','course:math','100'
put 'student','001201509011001','course:english','100'

hbase(main):096:0> scan 'student'
ROW                           COLUMN+CELL
 001201509011001              column=course:english, timestamp=1447766828720, value=100
 001201509011001              column=course:math, timestamp=1447766813289, value=100
 001201509011001              column=grade:, timestamp=1447766751652, value=2
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=name:, timestamp=1447766547713, value=Tom

加了很多rowKey进行测试：如下

base(main):127:0> scan 'student'
ROW                           COLUMN+CELL
 001201509011001              column=course:english, timestamp=1447766828720, value=100
 001201509011001              column=course:math, timestamp=1447766813289, value=100
 001201509011001              column=grade:, timestamp=1447766751652, value=2
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=course:english, timestamp=1447766987607, value=95
 001201509011002              column=course:math, timestamp=1447767003501, value=80
 001201509011002              column=grade:, timestamp=1447767073299, value=6
 001201509011002              column=name:, timestamp=1447766547713, value=Tom
 001201509011003              column=grade:, timestamp=1447767130750, value=5
 001201509011004              column=grade:, timestamp=1447767139371, value=3
 001201509011005              column=grade:, timestamp=1447767146338, value=3
 001201509011006              column=course:math, timestamp=1447767489278, value=30
 001201509011006              column=grade:, timestamp=1447767153088, value=2
 001201509011007              column=course:math, timestamp=1447767474245, value=87
 001201509011007              column=grade:, timestamp=1447767173296, value=2
 001201509011008              column=grade:, timestamp=1447767181639, value=3
 001201509011008              column=name:, timestamp=1447767278902, value=lucy
 001201509011009              column=grade:, timestamp=1447767190450, value=10
 001201509011009              column=name:, timestamp=1447767257259, value=Mike
 001201509011010              column=grade:, timestamp=1447767198644, value=11
 001201509011010              column=name:, timestamp=1447767236548, value=Peter

根据rowkey查看对应列的数据：

get '表名称'，'rowkey','列簇名称:列名称'

get 'student','001201509011001','name'

COLUMN                        CELL
 name:                        timestamp=1447766492893, value=Jim

查看表中的记录数：根据列簇来统计：

hbase(main):133:0* count 'student'

结果：10

查询表中指定列的所有记录：

语法：scan '表名',{COLUMNS =>'列簇'}

hbase(main):134:0> scan 'student',{COLUMNS=>'name'}

ROW                           COLUMN+CELL
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=name:, timestamp=1447766547713, value=Tom
 001201509011008              column=name:, timestamp=1447767278902, value=lucy
 001201509011009              column=name:, timestamp=1447767257259, value=Mike
 001201509011010              column=name:, timestamp=1447767236548, value=Peter

hbase(main):135:0> scan 'student',{COLUMNS=>'grade'}
ROW                           COLUMN+CELL
 001201509011001              column=grade:, timestamp=1447766751652, value=2
 001201509011002              column=grade:, timestamp=1447767073299, value=6
 001201509011003              column=grade:, timestamp=1447767130750, value=5
 001201509011004              column=grade:, timestamp=1447767139371, value=3
 001201509011005              column=grade:, timestamp=1447767146338, value=3
 001201509011006              column=grade:, timestamp=1447767153088, value=2
 001201509011007              column=grade:, timestamp=1447767173296, value=2
 001201509011008              column=grade:, timestamp=1447767181639, value=3
 001201509011009              column=grade:, timestamp=1447767190450, value=10
 001201509011010              column=grade:, timestamp=1447767198644, value=11
10 row(s) in 0.0220 seconds

hbase(main):136:0> scan 'student',{COLUMNS=>'course'}
ROW                           COLUMN+CELL
 001201509011001              column=course:english, timestamp=1447766828720, value=100
 001201509011001              column=course:math, timestamp=1447766813289, value=100
 001201509011002              column=course:english, timestamp=1447766987607, value=95
 001201509011002              column=course:math, timestamp=1447767003501, value=80
 001201509011006              column=course:math, timestamp=1447767489278, value=30
 001201509011007              column=course:math, timestamp=1447767474245, value=87
4 row(s) in 0.0130 seconds

查询表中指定区间的所有记录数：

也可以指定一些修饰词：TIMERANGE, FILTER, LIMIT, STARTROW, STOPROW, TIMESTAMP, MAXLENGTH,or COLUMNS。没任何修饰词，就是上边例句，就会显示所有数据行。

语法：scan '表名',{COLUMNS =>'列簇',LIMIT =>记录数,STARTROW=>'开始rowkey',STOPROW=>'结束rowkey'}

取出name列族，前3条记录

hbase(main):012:0> scan 'student',{COLUMNS=>['name'],LIMIT=>3}
ROW                           COLUMN+CELL
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=name:, timestamp=1447766547713, value=Tom
 001201509011008              column=name:, timestamp=1447767278902, value=lucy

取出name列族，前3条记录 rowkey[001201509011001,001201509011008) 左边闭合，右边开的数据。

hbase(main):014:0> scan 'student',{COLUMNS=>['name'],LIMIT=>3,STARTROW=>'001201509011001',STOPROW=>'001201509011008'}
ROW                           COLUMN+CELL
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=name:, timestamp=1447766547713, value=Tom

指定两列：name，grade

hbase(main):018:0> scan 'student',{COLUMNS=>['name','grade'],STARTROW=>'001201509011001',STOPROW=>'001201509011010'}

ROW                           COLUMN+CELL
 001201509011001              column=grade:, timestamp=1447766751652, value=2
 001201509011001              column=name:, timestamp=1447766492893, value=Jim
 001201509011002              column=grade:, timestamp=1447767073299, value=6
 001201509011002              column=name:, timestamp=1447766547713, value=Tom
 001201509011003              column=grade:, timestamp=1447767130750, value=5
 001201509011004              column=grade:, timestamp=1447767139371, value=3
 001201509011005              column=grade:, timestamp=1447767146338, value=3
 001201509011006              column=grade:, timestamp=1447767153088, value=2
 001201509011007              column=grade:, timestamp=1447767173296, value=2
 001201509011008              column=grade:, timestamp=1447767181639, value=3
 001201509011008              column=name:, timestamp=1447767278902, value=lucy
 001201509011009              column=grade:, timestamp=1447767190450, value=10
 001201509011009              column=name:, timestamp=1447767257259, value=Mike

可以根据 TIMERANGE查询：

hbase(main):020:0> scan 'student',{COLUMNS=>['grade'],LIMIT => 3,TIMERANGE=>[1447766751652,1447767257259]}

ROW                           COLUMN+CELL
 001201509011001              column=grade:, timestamp=1447766751652, value=2
 001201509011002              column=grade:, timestamp=1447767073299, value=6
 001201509011003              column=grade:, timestamp=1447767130750, value=5

删除数据：

rowkey=001201509011002 的数据有4列

hbase(main):024:0> get 'student','001201509011002'
COLUMN                        CELL
 course:english               timestamp=1447766987607, value=95
 course:math                  timestamp=1447767003501, value=80
 grade:                       timestamp=1447767073299, value=6
 name:                        timestamp=1447766547713, value=Tom

删除一行数据：

hbase(main):027:0> delete 'student','001201509011002','grade'

hbase(main):028:0> get 'student','001201509011002'
COLUMN                        CELL
 course:english               timestamp=1447766987607, value=95
 course:math                  timestamp=1447767003501, value=80
 name:                        timestamp=1447766547713, value=Tom

查看那一行的数据：发现没有了。

hbase(main):033:0> scan 'student',{COLUMNS=>['grade'],STARTROW=>'001201509011002',STOPROW=>'001201509011003'}
ROW                           COLUMN+CELL
0 row(s) in 0.0080 seconds

Face your past without regret. Handle your present with confidence.Prepare for future without fear. keep the faith and drop the fear.

面对过去无怨无悔，把握现在充满信心，备战未来无所畏惧。保持信念，克服恐惧！一点一滴的积累，一点一滴的沉淀，学技术需要不断的积淀！

hbase shell学习-2

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