目录正文首先创建表导入数据及查询其他注意事项总结
正文
现有文件为csv格式,需要导入hive中,设csv内容如下
1001,zs,231002,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textfileload data local inpath \’/data/csv2.csv\’ into table csv2;drop table csv3;– 创建csv3,保存格式parquetcreate 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csv3insert 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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