Ok I did more investigation on this and traced the issue down to a
singe npgsql bug. Enums actually work fine, as long as you're using
an IDataReader to get at the data. Once you attempt to load the
reader into a DataSet, it blows up. I'll log this bug..
Mike
On Mon, Jun 7, 2010 at 4:43 AM, Mike Christensen <mike@xxxxxxxxxxxxx> wrote:
> This is probably not the right forum for this question, but maybe
> someone can help me out or redirect me.
>
> I'm running into a lot of problems with npgsql and enum types. There
> seems to be very little support or testing in this area. The issue
> right now is I have a lot of SQL functions that have OUT parameters of
> an enum type. Such as:
>
> CREATE TYPE UnitTypeEnum AS ENUM ('Unit', 'Volume', 'Weight');
>
>
> CREATE OR REPLACE FUNCTION readformsforingredient(IN _ingredient text,
> OUT UnitType UnitTypeEnum)
> RETURNS SETOF record AS
> ...
>
> When I call that function using the npgsql driver, I get all sorts of
> errors. The data table simple has no ProviderType (it's blank), even
> though the DataType is System.String. If I try to read the data
> reader, I get exceptions. The solution I found is to cast the enum to
> a text, such as:
>
> CREATE OR REPLACE FUNCTION readformsforingredient(IN _ingredient text,
> OUT UnitType text)
> ...
> select UnitType::text from foo;
>
> However, this becomes a pain if I'm not using OUT parameters and just
> returning a set of a row type. Plus, having to cast ENUMs is kind of
> a hack.
>
> Are the people working on npgsql aware of this problem, and can we
> expect to get real enum support in future versions? It seems they
> should just magically cast to either a string or an int and I
> shouldn't have to worry about that. Thanks!!
>
> Mike
>
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