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=>1ROW 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 seconds2.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 DELIMITEDFIELDS 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;-- The End --
