sqoop Oracle 导入到hive 日期时间消失

dogplays2024-11-11 23:18

sqoop脚本：

sqoop import -D mapred.job.queue.name=highway \
-D mapreduce.map.memory.mb=4096 \
-D mapreduce.map.java.opts=-Xmx3072m \
--connect "jdbc:oracle:thin:@//localhost:61521/LZY2" \
--username LZSHARE \
--password '123456' \
--query "SELECT 
    TO_CHAR(GCRQ, 'YYYY') AS gcrq_year,
    TO_CHAR(GCRQ, 'MM') AS gcrq_month,
    TO_CHAR(GCRQ, 'DD') AS gcrq_day,
    YEAR,
    TO_CHAR(GCRQ, 'YYYY-MM-DD HH24:MI:SS') AS GCRQ,
    ........
    TO_CHAR(DELETE_TIME, 'YYYY-MM-DD HH24:MI:SS') AS DELETE_TIME,
    CREATE_BY,
    TO_CHAR(CREATE_TIME, 'YYYY-MM-DD HH24:MI:SS') AS CREATE_TIME,
    UPDATE_BY,
    TO_CHAR(UPDATE_TIME, 'YYYY-MM-DD HH24:MI:SS') AS UPDATE_TIME,
    TO_CHAR(INSERT_TIME, 'YYYY-MM-DD HH24:MI:SS') AS INSERT_TIME
	FROM LZJHGX.dat_dcsj_time
WHERE TO_CHAR(GCRQ , 'YYYY-MM-DD') < TO_CHAR(SYSDATE, 'YYYY-MM-DD') AND \$CONDITIONS" \
--split-by sjxh \
--hcatalog-database dw \
--hcatalog-table ods_pre_dat_dcsj_time \
--hcatalog-storage-stanza 'stored as orc' \
--num-mappers 20

其中query语句在Oracle中执行时，日期时间都是完整保留的。

但是执行完毕查看hive，却发现日期时间字段都是为NULL。

但如果不做tochar转换会报错：

Error: java.lang.ClassCastException: java.sql.Timestamp cannot be cast to org.apache.hadoop.hive.common.type.Timestamp

那么换个解决思路，将hive表中的timestamp字段改为string类型，这样修改后成功解决。