正文
现有文件为csv格式,需要导入hive中,设csv内容如下
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1001,zs,23 1002,lis,24 |
首先创建表
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create table if not exists csv2( uid int , uname string, age int ) row format serde 'org.apache.hadoop.hive.serde2.OpenCSVSerde' stored as textfile ; |
导入数据及查询
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load data local inpath '/data/csv2.csv' into table csv2; select * from csv2; |
其他注意事项
如果建表是parquet格式可否load导入csv文件?
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drop table csv2; create table if not exists csv2( uid int , uname string, age int ) row format serde 'org.apache.hadoop.hive.serde2.OpenCSVSerde' stored as parquet ;
load data local inpath '/data/csv2.csv' into table csv2; select * from csv2; |
使用时会报错
Failed with exception java.io.IOException:java.lang.RuntimeException: hdfs://192.168.10.101:8020/user/hive/warehouse/csv2/csv2.csv is not a Parquet file. expected magic number at tail [80, 65, 82, 49] but found [44, 50, 52, 10]
**不可以,需要先导入成textfile,之后再从临时表导入成parquet,**如下
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drop table csv2; create table if not exists csv2 ( uid int , uname string, age int ) row format serde 'org.apache.hadoop.hive.serde2.OpenCSVSerde' stored as textfile; -- 先导入csv文件到表格csv2,保存格式是textfile load data local inpath '/data/csv2.csv' into table csv2;
drop table csv3; -- 创建csv3,保存格式parquet create table if not exists csv3 ( uid int , uname string, age int ) row format delimited fields terminated by ',' stored as parquet; -- 提取csv2的数据插入到csv3 insert overwrite table csv3 select * from csv2; |
总结
关键是要引入org.apache.hadoop.hive.serde2.OpenCSVSerde csv 要保存到 hive 的 parquet ,需要先保存成 textfile以上就是Hive导入csv文件示例的详细内容，更多关于Hive导入csv文件的资料请关注服务器之家其它相关文章！
原文链接：https://blog.csdn.net/u010711495/article/details/111722382