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Re: How to parse xml containing optional elements

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Hi!

Thank you.

How to upgrade in Debian Squeeze ?
A plain "apt-get upgrade postgresql-9.1" does not work?
It might help to enable the postgresql.org APT repository. For instructions, see here:
https://www.postgresql.org/download/linux/debian/

apt-get upgrade postgresql-9.1 returns

Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
openssl : Depends: libssl1.0.0 (>= 1.0.1e-2+deb7u5) but it is not installable
wkhtmltox : Depends: libssl1.0.0 but it is not installable
E: Unmet dependencies. Try using -f.

so it looks like repository is found but not usable ?


How to add IBAN column to result table? This column has same value for
all rows.

SELECT
    endaaa,
    (xpath('ns:Amt/text()', x,nsa))[1]::text::numeric AS tasusumma,
    (xpath('ns:NtryDtls/ns:TxDtls/ns:Refs/ns:EndToEndId/text()',
x,nsa))[1] AS orderinr

FROM (
    SELECT
(xpath('/ns:Document/ns:BkToCstmrStmt/ns:Stmt/ns:Acct/ns:Id/ns:IBAN/text()',
x,nsa))[1] as endaaa,
    unnest(xpath('/ns:Document/ns:BkToCstmrStmt/ns:Stmt/ns:Ntry',
x,nsa)) as x, nsa
    FROM t
) Ntry

Be careful, this will only work when there is exactly one ns:Stmt element in the document. Else you will have to build a third query level, first selecting the ns:Stmt entries, second the IBAN and Ntry from them and third amount and EndToEndId.

Hopefully there is only one Stmt element in single file.

I solved it by moving xpath to select IBAN to main select:

SELECT
(xpath('/ns:Document/ns:BkToCstmrStmt/ns:Stmt/ns:Acct/ns:Id/ns:IBAN/text()', xo,nsa))[1]::text AS endaaa,
    (xpath('ns:Amt/text()', x,nsa))[1]::text::numeric AS tasusumma,
    (xpath('ns:NtryDtls/ns:TxDtls/ns:Refs/ns:EndToEndId/text()',
x,nsa))[1] AS orderinr

FROM (
    SELECT
    unnest(xpath('/ns:Document/ns:BkToCstmrStmt/ns:Stmt/ns:Ntry',
x,nsa)) as x, nsa, x as xo
    FROM t
) Ntry

This references endaaa from single select only. Changing code requires changing only one line.

Is this OK ?

Andrus.


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