postgresql - How would you read a csv in a stored procedure such that the csv needs data extraction? -


the csv has urls of images in format - 

www.domain.com/table_id/x_y_height_width.jpg

we want extract table_id, x, y, height , width these urls in stored procedure , use these parameters in multiple sql queries.

how can that?

regexp_split_to_array , split_part functions

create or replace function split_url (     _url text, out table_id int, out x int, out y int, out height int, out width int ) $$     select         a[2]::int,         split_part(a[3], '_', 1)::int,         split_part(a[3], '_', 2)::int,         split_part(a[3], '_', 3)::int,         split_part(split_part(a[3], '_', 4), '.', 1)::int     (values         (regexp_split_to_array(_url, '/'))     ) rsa(a); $$ language sql immutable;  select * split_url('www.domain.com/234/34_12_400_300.jpg');  table_id | x  | y  | height | width  ----------+----+----+--------+-------       234 | 34 | 12 |    400 |   300

to use function other tables lateral:

with t (url) ( values     ('www.domain.com/234/34_12_400_300.jpg'),     ('www.examplo.com/984/12_90_250_360.jpg') ) select *     t     cross join lateral     split_url(url) ;                   url                  | table_id | x  | y  | height | width  ---------------------------------------+----------+----+----+--------+-------  www.domain.com/234/34_12_400_300.jpg  |      234 | 34 | 12 |    400 |   300  www.examplo.com/984/12_90_250_360.jpg |      984 | 12 | 90 |    250 |   360

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