NiFi: How to enter CSV file content and meta data into single table of postgresql database by NiFi

Question

Hi,

I have csv files and I want to move the content of files along with its meta data (File name, source (To be hard coded), control number (Part of file name - to be extracted from file name itself) thru NiFi. So here is the sample File name and layout -

File name - 12345_user_data.csv (control_number_user_data.csv)

source - Newyork

CSV File Content/columns -

Fields - abc1, abc2, abc3, abc4

values - 1,2,3,4

Postgres Database table layout

Table name - User_Education

fields name -

control_number, file_name, source, abc1, abc2, abc3, abc4

Values -

12345, 12345_user_data.csv, Newyork, 1,2,3,4

I am planning to use below processors -

ListFile

FetchFile

UpdateAttributes

PutDatabaseRecords

LogAttributes

But I am not sure how to combine the actual content with the meta data to load into one single table. Please help

stevenmatison · Accepted Answer

@vikrant_kumar24

There are many ways to do this. I have added a template to my NiFI templates for you. This way takes a csv Input, splits the lines, extracts two columns, builds an insert statement, and executes that statement (requires database connection pool controller service).

The only real tricky part to this is the regex for mapping the columns in ExtractText Processor.

https://github.com/steven-dfheinz/NiFi-Templates

Once you are able to parse the csv to attributes, adding more attributes for metadata, and adding those details to the insert query should be very easy.

Hope this helps get you started. Additionally, if you search here, you will find loads of posts with all the other suggested methods for processing csv to sql.

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