Question

我有以下方式的数据集。

ravi,savings,avinash,2,char,33,F,22,44,12,13,33,44,22,11,10,22,2006-01-23
avinash,current,sandeep,3,char,44,M,33,11,10,12,33,22,39,12,23,19,2001-02-12
supreeth,savings,prabhash,4,char,55,F,22,12,23,12,44,56,7,88,34,23,1995-03-11
lavi,current,nirmesh,5,char,33,M,11,10,33,34,56,78,54,23,445,66,1999-06-15
Venkat,savings,bunny,6,char,11,F,99,12,34,55,33,23,45,66,23,23,2016-05-18

最后一栏（例如：2006-01-23）是日期。我正在尝试使用PIG使用以下命令加载上述数据。以下是我用来加载文件的代码。

file = LOAD 'FI_USER_CREDS_TBL_T.txt' 
       USING PigStorage(',') AS (USER_ID:chararray,
                                 ROLE_ID:chararray,
                                 USER_PW:chararray,
                                 NUM_PWD_HISTORY:int,
                                 PWD_HISTORY:chararray,                                     
                                 PWD_LAST_MOD_TIME:int,
                                 NUM_PWD_ATTEMPTS:int,
                                 NEW_USER_FLG:chararray,
                                 LOGIN_TIME_LOW:int,
                                 LOGIN_TIME_HIGH:int,
                                 DISABLED_FROM_DATE:int,
                                 DISABLED_UPTO_DATE:int,
                                 PW_EXPY_DATE:int,
                                 ACCT_EXPY_DATE:int,
                                 ACCT_INACTIVE_DAYS:int,                                     
                                 LAST_ACCESS_TIME:int,
                                 TS_CNT:int,
                                 DTL__CAPXTIMESTAMP:int,
                                 ETL_INSERT_DATE:datetime);

但它不是在读取日期列而是在使用dump file命令后给出以下输出。

(ravi,savings,avinash,2,char,33,,22,44,12,13,33,44,22,11,10,22,,)
(avinash,current,sandeep,3,char,44,,33,11,10,12,33,22,39,12,23,19,,)
(supreeth,savings,prabhash,4,char,55,,22,12,23,12,44,56,7,88,34,23,,)
(lavi,current,nirmesh,5,char,33,,11,10,33,34,56,78,54,23,445,66,,)
(Venkat,savings,bunny,6,char,11,,99,12,34,55,33,23,45,66,23,23,,)

我如何阅读日期栏。

请在这方面帮助我。

感谢-你。

Answer 1

将日期加载为chararray，然后转换为日期格式

像：

file2 = FOREACH文件GENERATE ToDate（date，'dd / MM / yyyy'）AS date，....

试试此链接以供参考， http://pig.apache.org/docs/r0.11.0/api/org/apache/pig/builtin/ToDate.html 要么 http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

Answer 2

将数据加载为chararray。

file = LOAD'FI_USER_CREDS_TBL_T.txt'使用PigStorage（'，'）AS（USER_ID：chararray，ROLE_ID：chararray，USER_PW：chararray，NUM_PWD_HISTORY：int，PWD_HISTORY：chararray，PWD_LAST_MOD_TIME：int，NUM_PWD_ATTEMPTS：int，NEW_USER_FLG： chararray，LOGIN_TIME_LOW：INT，LOGIN_TIME_HIGH：INT，DISABLED_FROM_DATE：INT，DISABLED_UPTO_DATE：INT，PW_EXPY_DATE：INT，ACCT_EXPY_DATE：INT，ACCT_INACTIVE_DAYS：INT，LAST_ACCESS_TIME：INT，TS_CNT：INT，DTL__CAPXTIMESTAMP：INT，ETL_INSERT_DATE：chararray）;

- ToDate builtIn函数用于转换为datetime，格式需要指定

文件2 = FOREACH文件GENERATE USER_ID，ROLE_ID，USER_PW，NUM_PWD_HISTORY，PWD_HISTORY，PWD_LAST_MOD_TIME，NUM_PWD_ATTEMPTS，NEW_USER_FLG，LOGIN_TIME_LOW，LOGIN_TIME_HIGH，DISABLED_FROM_DATE，DISABLED_UPTO_DATE，PW_EXPY_DATE，ACCT_EXPY_DATE，ACCT_INACTIVE_DAYS，LAST_ACCESS_TIME，TS_CNT，DTL__CAPXTIMESTAMP，TODATE（ETL_INSERT_DATE，“YYYY -MM-dd'）AS ETL_INSERT_DATE;

描述file2; dump file2;

使用PIG加载日期时间格式文件

2 个答案: