Hive表数据的加载与导出

        本篇博客,小菌为大家详细地带来Hive中表数据的加载与导出。

Hive表数据加载

​1.直接向分区表中插入数据​

insert into table score3 partition(month =‘201807’) values (‘001’,‘002’,‘100’);

​2、通过查询插入数据​

先通过load加载创建一个表

​(linux)​ ​load data​ local inpath ‘/export/servers/hivedatas/score.csv’ overwrite into table score partition(month=‘201806’);

​(HDFS)​ ​load data​ inpath ‘/export/servers/hivedatas/score.csv’ overwrite into table score

partition(month=‘201806’);

通过​查询​方式加载数据

create table score4 like score;

insert ​overwrite​ table score4 partition(month = ‘201806’) select s_id,c_id,s_score from score;

关键字overwrite必须要有

​3、多插入模式​

​from score​

insert overwrite table score_first partition(month=‘201806’) select s_id,c_id

insert overwrite table score_second partition(month = ‘201806’) select c_id,s_score;

​4、查询语句中创建表并加载数据（as select）​

create table score5 as select * from score;

​5、创建表时通过location指定加载数据路径​

create ​external​ table score6 (s_id string,c_id string,s_score int) row format delimited fields terminated by ‘\t’ location ‘/myscore6’;

Hive表数据的导出

​1、将查询的结果导出到本地​

insert overwrite local directory ‘/export/servers/exporthive/a’ select * from score;

​2、将查询的结果格式化导出到本地​

insert overwrite local directory ‘/export/servers/exporthive’ row format delimited fields terminated by ‘\t’ collection items terminated by ‘#’ select * from student;

​3、将查询的结果导出到HDFS上(没有local)​

insert overwrite directory ‘/export/servers/exporthive’ row format delimited fields terminated by ‘\t’ collection items terminated by ‘#’ select * from score;

​4、Hadoop命令导出到本地​

dfs -get /export/servers/exporthive/000000_0 /export/servers/exporthive/local.txt;

​5.hive shell 命令导出​

bin/hive -e “select * from yhive.score;” > /export/servers/exporthive/score.txt

​6.export导出到HDFS上（全表导出）​

export table score to ‘/export/exporthive/score’;