将csv文件导入mongodb
https://www.cnblogs.com/luoliangfei/p/8288261.html
mongoimport -d movie -c Rec --type csv --headerline --file /Users/season/Desktop/ratings-log-large_19.txt
https://www.cnblogs.com/luoliangfei/p/8288261.html
mongoimport -d movie -c Rec --type csv --headerline --file /Users/season/Desktop/ratings-log-large_19.txt