How to update Records of SAP table from .CSV file

Question

Hi,
I have written a code which takes a data from (,) delimited CSV file and adds it into the Internal table.
Now I want to update the all fields in SAP table with the Internal table.
I want to use Update statement.
Update <table Name> SET <field needs to update> WHERE connditon.
I don't want to iterate through thousand on record in sap table to check the where condition.
Could you please tell me how to do it.

Answer 1

Hi. I thing you will not workaround the iterating of the internal table.
You can pre-load all the records into another internal table
check lt_csv[] is not initial. " important, otherwise next select would read all records of the table
select .... into lt_dbitab for all entries in lt_csv where key-fieds = lt_csv-key_fields...
check sy-subrc eq 0 and lt_dbitab[] is not initial.
then do in-memory update of the it_dbitab
loop at it_dbitab assign <fs>.
  read table lt_csv assign <fs_csv> with key ... " lt_csv should be sorted table with key, or you should try to use binary search
  if sy-subrc eq 0.
    ...change required lt_dbitab fields: <fs>-comp = <fs_csv>-comp...
  endif.
endloop.
ant then you can do mass-update
update dbtab from table lt_dbitab.
From performance view, this solution should be much faster than iterating lt_csv directly and updating every single database record
Br
Bohuslav