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引言：上一篇文章《【甘道夫】Sqoop1.4.4 實現將 Oracle10g 中的增量資料匯入 Hive0.13.1 ，並更新Hive中的主表》http://blog.csdn.net/u010967382/article/details/38735381 描述了累加式更新Hive表的原理和Sqoop，Hive命令，本文基於上一篇文章的內容實現了shell指令碼的編寫，稍加修改就可用於實際工程。
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http://blog.csdn.net/u010967382/article/details/38824327
shell指令碼
#!/bin/bash
#Please set the synchronize interval,unit is hour.update_interval=24
#Please set the RDBMS connection paramsrdbms_connstr="jdbc:oracle:thin:@192.168.0.147:1521:ORCLGBK"rdbms_username="SP"rdbms_pwd="fulong"rdbms_table="OMP_SERVICE"rdbms_columns="ID,SERVICE_NAME,SERVICE_PROCESS,CREATE_TIME,ENABLE_ORG,ENABLE_PLATFORM,IF_DEL"
#Please set the hive paramshive_increment_table="SERVICE_TMP"hive_full_table="service_all"
#---------------------------------------------------------
#Import icrement data in RDBMS into Hiveenddate=$(date ‘+%Y/%m/%d %H:%M:%S‘)startdate=$(date ‘+%Y/%m/%d %H:%M:%S‘ -d ‘-‘+${update_interval}+‘ hours‘)
$SQOOP_HOME/bin/sqoop import --connect ${rdbms_connstr} --username ${rdbms_username} --password ${rdbms_pwd} --table ${rdbms_table} --columns "${rdbms_columns}" --where "CREATE_TIME > to_date(‘${startdate}‘,‘yyyy-mm-dd hh24:mi:ss‘) and CREATE_TIME < to_date(‘${enddate}‘,‘yyyy-mm-dd hh24:mi:ss‘)" --hive-import --hive-overwrite --hive-table ${hive_increment_table}
#---------------------------------------------------------
#Update the old full data table to latest status$HIVE_HOME/bin/hive -e "insert overwrite table ${hive_full_table} select * from ${hive_increment_table} union all select a.* from ${hive_full_table} a left outer join ${hive_increment_table} b on a.service_code = b.service_code where b.service_code is null;"
注意：在shell指令碼中執行hive hql的命令格式是 hive -e "select ..."
Cron指令碼添加定時任務每天淩晨2點執行該指令碼0 2 * * * /home/fulong/shell/dataSync.sh
【甘道夫】實現Hive資料同步更新的shell指令碼
