Re: Python interface and Money?

Thus spake Joel Mc Graw
> I have a table that has a column of type money.  A query such as "select
> sum(document_amount) from foo" returns the correct result when executed
> from psql, yet the same query returns the wrong answer (it appears to be
> a rounding issue--something like "1234.9999999999...") when executed
> through PygreSQL.  Is there a workaround or a fix?

That sounds like a Python issue.  The correct value is passed to the
Python function as a string since it is always stored and delivered
correctly in the database.  That's sort of the point of the money type.

I have been thinking of creating a money type in Python so that this
won't happen but haven't got around to it yet.  In the meantime you
can always format it with "%.2f" to get the correct value displayed.

> While browsing the mailing list for an answer to this problem I found
> several references to the money type being deprecated.  Is that the
> problem?

They keep saying that DECIMAL should be used instead but they are not
exactly equivalent.  The MONEY type was originally written with locale
support and displays the local currency symbol.

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