Re: psql - add special variable to reflect the last query status

2017-06-28 9:25 GMT+02:00 Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>:

>
> Hello Pavel,
>
> I agree that the existing "SetVariableBool" function is a misnommer, it
>>> should be "SetVariableOn" given what it does, and it is not what we need.
>>>
>>
>> switching default setting from ON to TRUE requires wider discussion -
>>
>
> Yep.
>
> in this moment I like to have special function "SetVariableON".
>>
>
> I'm fine with this, but this make it a change totally unrelated to this
> patch as it would not use the function... Moreover, this function would not
> use an hypothetical "set var bool" function because of the debatable on/off
> vs true/false change.
>
> Also, a "set var bool" function would be called only twice, which is not
> very beneficial for a oneliner, so I left it out.
>
> I agree that there is some common structure, but ISTM that the
>>> AcceptResult function is called in a variety of situation where variables
>>> are not to be set (eg "internal" queries, not user provided queries), so
>>> I
>>> thought it best to keep the two apart.
>>>
>>
>> I understand, but It is not nice, really - maybe only switch can be moved
>> to some inlining function like IsSuccess() - more .. with this function,
>> the SetResultVariables function will be more cleaner
>>
>
> Indeed. Attached v5 does that.

juju - something like this

+ if (success)
+ {
+ char *ntuples = PQcmdTuples(results);
+ SetVariable(pset.vars, "ROW_COUNT", *ntuples ? ntuples : "0");
+ SetVariable(pset.vars, "ERROR", "FALSE");
+ }
+ else
+ {
+ SetVariable(pset.vars, "ROW_COUNT", "0");
+ SetVariable(pset.vars, "ERROR", "TRUE");
+ }
+}

It can be simplified

SetVariable(pset.vars, "ROW_COUNT", success ? PQcmdTuples(results) : 0);
SetVariable(pset.vars, "ERROR", success ? "FALSE" : "TRUE");

Regards

Pavel

>
>
> --
> Fabien.