Tuesday 2 September 2014

Implement Insert (for new) and update (for existing) strategy in talend (tmap update/insert/reject)


Implement Insert (for new) and update (for existing) strategy in talend

Most of times in dwh/etl/data integration loads we have incoming source data feeds and we have to merge (update/insert) this with existing data in target table.
There are multiple ways to do this, i will explain one of the method i have used.

You have a source table - say srcemployee
you want to merge this data after doing lookup with target - tgtemployee
keys for lookup is say empid

all we need is source input, target input(lookup) tmap and toutput
in tmap we would join source input with target input on key column and select join options as all matches inner join. In tmap output we will have two groups once for handling matching records and other for handling rejects (records which were not satisfying the join condition) these are insert.

overall job (tmysqloutput_1 insert, tmysqloutput_2 is for update)



schema of input srcemployee

schema of input srcemployee


tmap join condition
tmap join condition

mention key for update in schema for tmysqloutput_2
mention key for update in schema for tmysqloutput_2

33 comments:

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  4. can you please explain step by step for new insert

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  5. i have tried like shown in the snapshot,i couldnt get the excepted results in it.please explain how to insert newly coming records from oracle table to oracle table

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    Replies
    1. you have to use inner join between incoming data and your existing data and then you need two output groups in tMap. one will catch the rejects of inner join. The rejects of inner joins will be the records which are to be inserted. you have to select correct options in the tmap output groups..you can share your job design to help you more.

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  6. Thanks for your reply Arpit.I will explain you My scenario if possible help me out.
    My source and target both are oracle but different schema say for an example source table name is cyper.employees(cyper is schema) and target table is APPS.employee_target(APPS is schema).

    In daily/weekly basis I have to load data from source table to target table in which newly arrived records should insert into target table and if there is any updation in old record it should get updated into target table.

    I refered this link : http://www.deepinopensource.com/scd-2-implementations-in-talend/

    It's not comprehensive.

    hope you got my scenario.

    Thanks in advance.

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  11. Thanks a lot mate for sharing a important topic in talend it has helped me lot to enhance my knowledge in Talend Technology Thank You

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