通过shell访问hive_通过hive访问hbase中的表

在hbase中创建表后,我们只能在hbase shell中使用scan查询数据,这对于熟悉SQL的使用者不怎么习惯,不过我们可以在hive中创建外部表来访问hbase表中的数据,例子如下:

1.这里hbase中的表oss_user_label_action_data已经存在

=> #:0xd5a1b0>

hbase(main):067:0> scan 'oss_user_label_action_data',LIMIT=>1

ROW                                COLUMN+CELL

201407|31130101|8613500000001     column=info:areacode, timestamp=1415243857802, value=22

201407|31130101|8613500000001     column=info:cardtype, timestamp=1415243857802, value=1

201407|31130101|8613500000001     column=info:createtime, timestamp=1415243857802, value=20141028 11:18:34

201407|31130101|8613500000001     column=info:enable_flag, timestamp=1415243857802, value=0

201407|31130101|8613500000001     column=info:extstring, timestamp=1415243857802, value=

201407|31130101|8613500000001     column=info:labelno, timestamp=1415243857802, value=31130101

201407|31130101|8613500000001     column=info:labelvalue, timestamp=1415243857802, value=9693

201407|31130101|8613500000001     column=info:modifytime, timestamp=1415243857802, value=20141028 11:18:45

201407|31130101|8613500000001     column=info:monthno, timestamp=1415243857802, value=201407

201407|31130101|8613500000001     column=info:provcode, timestamp=1415243857802, value=1

201407|31130101|8613500000001     column=info:usernumber, timestamp=1415243857802, value=8613500000001

1 row(s) in 0.0580 seconds

2.创建外部表

CREATE EXTERNAL TABLE hive_oss_user_label_action_data(

key string,

monthno string,

usernumber string,

labelno string,

labelvalue string,

provcode string,

areacode string,

cardtype string,

extstring string,

createtime string,

modifytime string

)

STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'

WITH SERDEPROPERTIES

("hbase.columns.mapping" =

":key,info:monthno,info:usernumber,info:labelno,info:labelvalue,info:provcode,info:areacode,info:cardtype,info:extstring,info:createtime,info:modifytime")

TBLPROPERTIES("hbase.table.name" = "oss_user_label_action_data");

注意hbase.columns.mapping后面的字段直接不能出现空格和换行.

3.通过hive查询数据

根据rowkey查询

select * from hive_oss_user_label_action_data where key='201407|31130101|8613500000001'

根据某个字段查询

select * from hive_oss_user_label_action_data where usernumber='8613500000001'

组合查询

select * from hive_oss_user_label_action_data where usernumber='8613500000001' and labelno='31130101'

说明:

这里我们访问的hive_oss_user_label_action_data表是虚表,数据是存储在hbase中的,我们可以创建另外一个hive中的表,

将hbase中的数据加载到hive本地

创建另外一个表

CREATE TABLE hive_oss_user_label_action_data_local(

key string,

monthno string,

usernumber string,

labelno string,

labelvalue string,

provcode string,

areacode string,

cardtype string,

extstring string,

createtime string,

modifytime string

)

ROW FORMAT DELIMITED

FIELDS TERMINATED BY '\t'

STORED AS TEXTFILE;

将hbase中的表数据加载到本地表

INSERT OVERWRITE TABLE hive_oss_user_label_action_data_local SELECT * FROM hive_oss_user_label_action_data;

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