Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
> On Sat, Jul 03, 2004 at 11:03:33AM -0400, Tom Lane wrote:
>> What about reporting transaction state/nesting level to client? I did not
>> like the GUC-variable approach in the original patch, partly on grounds of
>> efficiency and partly because I doubt it works under transaction-failure
>> conditions. I'm inclined to think we need a small protocol change.
>> Perhaps it would work to add an additional field to Z messages that is
>> only sent when nest level > 1.
> It's a shame to have to lose backwards compatibility.
I don't like using ParameterStatus because it's not designed for dealing
with values that may change many times in a single query. Also it sends
strings, which this really isn't.
I haven't looked at JDBC, but at least in the libpq code, what we could
safely do is extend the existing no transaction/in transaction/in failed
transaction field to provide a five-way distinction: those three cases
plus in subtransaction/in failed subtransaction. You could not directly
tell the depth of your subxact from this, but do you need to?
regards, tom lane
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