標籤:des style blog color java 使用 os io
匯入表的所有欄位
sqoop import --connect jdbc:oracle:thin:@192.168.1.107:1521:ORCL \--username SCOTT --password tiger \--table EMP \--hive-import --create-hive-table --hive-table emp -m 1;
如果報類似的錯:
ERROR tool.ImportTool: Encountered IOException running import job: org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory EMP already exists
先去HDFS系統中刪除該檔案: hadoop fs -rmr /user/hadoop/EMP
如果報類似的錯:
FAILED: Error in metadata: AlreadyExistsException(message:Table emp already exists)
如果報類似的錯:
hive.HiveImport: Exception in thread "main" java.lang.NoSuchMethodError: org.apache.thrift.EncodingUtils.setBit(BIZ)B
這是因為在同路徑下安裝了hive和hbase,而hbase和hive的lib目錄下的thrift版本不同。
hbase下的為libthrift-0.x.0.jar,hive下的為libthrift-0.x.0.jar。將Hbase下的0.x.0版的刪除,換為0.x.0的即可。
ps:不知為什麼Sqoop向Hive中匯入資料還有Hbase的事;
說明:hive表已經存在,需要先刪除。
查看:
desc emp;empno doubleename stringjob stringmgr doublehiredate stringsal doublecomm doubledeptno double
select * from emp;7369.0 SMITH CLERK 7902.0 1980-12-17 00:00:00.0 800.0 NULL 20.07499.0 ALLEN SALESMAN 7698.0 1981-02-20 00:00:00.0 1600.0 300.0 30.07521.0 WARD SALESMAN 7698.0 1981-02-22 00:00:00.0 1250.0 500.0 30.07566.0 JONES MANAGER 7839.0 1981-04-02 00:00:00.0 2975.0 NULL 20.07654.0 MARTIN SALESMAN 7698.0 1981-09-28 00:00:00.0 1250.0 1400.0 30.0……
註:一般情況下不使用--create-hive-table去建立表的,因為它建立的表的欄位格式,不符合我們的要求。
匯入表的指定欄位
手工建立hive表:
create table emp_column(empno int,ename string,job string,mgr int,hiredate string,sal double,comm double,deptno int)row format delimited fields terminated by ‘\t‘ lines terminated by ‘\n‘ stored as textfile;
sqoop import --connect jdbc:oracle:thin:@192.168.1.107:1521:ORCL \--username SCOTT --password tiger \--table EMP --columns "EMPNO,ENAME,JOB,SAL,COMM" \--fields-terminated-by ‘\t‘ --lines-terminated-by ‘\n‘ \--hive-drop-import-delims --hive-import --hive-table emp_column \-m 3;
說明:重新再執行,每重複匯入一次,hive中的資料會重複匯入。
sqoop import --connect jdbc:oracle:thin:@192.168.1.107:1521:ORCL \--username SCOTT --password tiger \--table EMP --columns "EMPNO,ENAME,JOB,SAL,COMM" \--fields-terminated-by ‘\t‘ --lines-terminated-by ‘\n‘ \--hive-drop-import-delims --hive-overwrite --hive-import --hive-table emp_column \-m 3;
註:--hive-overwrite指定覆蓋表裡已經存在的記錄,99%都是要使用overwrite的,避免重跑時產生重複資料。
匯入表的指定欄位到hive分區表
建立hive分區表:
create table emp_partition(empno int,ename string,job string,mgr int,hiredate string,sal double,comm double,deptno int)partitioned by (pt string)row format delimited fields terminated by ‘\t‘ lines terminated by ‘\n‘ stored as textfile;
匯入pt=‘2013-08-01‘
sqoop import --connect jdbc:oracle:thin:@192.168.1.107:1521:ORCL \--username SCOTT --password tiger \--table EMP --columns "EMPNO,ENAME,JOB,SAL,COMM" \--hive-overwrite --hive-import --hive-table emp_partition \--fields-terminated-by ‘\t‘ --lines-terminated-by ‘\n‘ \--hive-drop-import-delims --hive-partition-key ‘pt‘ --hive-partition-value ‘2013-08-01‘ \-m 3;
匯入pt=‘2013-08-02‘
sqoop import --connect jdbc:oracle:thin:@192.168.1.107:1521:ORCL \--username SCOTT --password tiger \--table EMP --columns "EMPNO,ENAME,JOB,SAL,COMM" \--hive-overwrite --hive-import --hive-table emp_partition \--fields-terminated-by ‘\t‘ --lines-terminated-by ‘\n‘ \--hive-drop-import-delims --hive-partition-key ‘pt‘ --hive-partition-value ‘2013-08-02‘ \-m 3;
查詢:
select * from emp_partition where pt=‘2013-08-01‘;select * from emp_partition where pt=‘2013-08-02‘;