Hive导入csv文件 |
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现有文件为csv格式,需要导入hive中,设csv内容如下 1001,zs,23 1002,lis,24首先创建表 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 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? 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 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.OpenCSVSerdecsv要保存到hive的parquet,需要先保存成textfile |
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