ethereal_r...@hotmail.com wrote:
> Hello, I'm working with PostgreSQL and Python to obtain 2 columns froma
> database and need to print it in a specific format.
>
> Here is my current code.
>
>
>
> #!/usr/bin/python
> # -*- coding: utf-8 -*-
>
> import psycopg2
> import sys
>
> con = None
>
> try:
>
> con = psycopg2.connect(database='DB', user='ME', password='1234')
>
> cur = con.cursor()
> cur.execute(" select Account_Invoice.amount_untaxed, right
> (Res_Partner.vat,length(Res_Partner.vat)-2) as RFC from
> Account_Invoice inner join Res_Partner on Account_Invoice.partner_id =
> Res_Partner.id inner join Account_Invoice_Tax on Account_Invoice.id =
> Account_Invoice_Tax.invoice_id where account_invoice.journal_id=2 and
> account_invoice.date_invoice >= '2013-01-01' and
> account_invoice.date_invoice <= '2013-02-01' and
> account_invoice.reconciled is TRUE and account_invoice_tax.account_id
> = 3237 and account_invoice.amount_tax >= 0;")
>
> rows = cur.fetchall()
>
> for row in rows:
> print row
>
>
> except psycopg2.DatabaseError, e:
> print 'Error %s' % e
> sys.exit(1)
>
>
> finally:
>
> if con:
> con.close()
>
>
>
>
> Now assume that fetchall would print the following:
>
> LOEL910624ND5 from the column vat as RFC.
> 227 from the column amount_untaxed.
>
>
> Now I would need to print that in the following format.
>
> 04|85|LOEL910624ND5|||||227|||||||||||||||
>
> 04 always goes in the first column and 85 always goes in the second, vat
> goes in the third and the amount_untaxed goes in the eight column but we
> still need to have 22 columns in total.
Keep it simple:
COLUMN_COUNT = 22
TEMPLATE = "04|85|{0}|||||{1}|||||||||||||||"
assert TEMPLATE.count("|") == COLUMN_COUNT -1, "You cannot count ;)"
for row in cur.fetchall():
print TEMPLATE.format(*row)
A bit more general:
fill_rows(rows):
out_row = [""] * 22
out_row[0] = "04"
out_row[1] = "85"
for row in rows:
out_row[2], out_row[7] = row
# copying not necessary here, but let's play it safe
yield out_row[:]
writer = csv.writer(sys.stdout, delimiter="|")
writer.writerows(fill_rows(cur.fetchall()))
All untested code.
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