pig筆記

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1.安裝Pig

将pig添加到環境變量當中

2.pig使用

首先将資料庫中的資料導入到HDFS上

sqoop import --connect jdbc:mysql://192.168.1.10:3306/cloud --username root --

password JChubby123  --table trade_detail --target-dir '/sqoop/td'

password JChubby123  --table user_info --target-dir '/sqoop/ui'

td = load '/sqoop/td' using PigStorage(',') as (id:long, account:chararray, 

income:double, expenses:double, time:chararray);

ui = load '/sqoop/ui' using PigStorage(',') as (id:long, account:chararray, 

name:chararray, age:int);

td1 = foreach td generate account, income, expenses, income-expenses as surplus;

td2 = group td1 by account;

td3 = foreach td2 generate group as account, SUM(td1.income) as income, SUM

(td1.expenses) as expenses, SUM(td1.surplus) as surplus;

tu = join td3 by account, ui by account;

result = foreach tu generate td3::account as account, ui::name, td3::income, 

td3::expenses, td3::surplus;

store result into '/result' using PigStorage(',');