Re: Dumb question: How do I determine programmatically if a column is nullable?

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От Tom Lane
Тема Re: Dumb question: How do I determine programmatically if a column is nullable?
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Msg-id 3816.1073540510@sss.pgh.pa.us
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Ответ на Re: Dumb question: How do I determine programmatically if a column is nullable?  ("Dann Corbit" <DCorbit@connx.com>)
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"Dann Corbit" <DCorbit@connx.com> writes:
> In other words, I will be passed a SQL query.  I don't want to have to
> parse it myself.
> Rather, I want to know (for the bound columns) if a column is nullable
> or not.
> Is the functionality available in [for example] libpq?

As of 7.4, see PQftable() and PQftablecol(), and look into pg_attribute
to see whether the column is marked NOTNULL.
        regards, tom lane

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