/*
* Convert a Python object to a composite Datum, using all supported
* conversion methods: composite as a string, as a sequence, as a mapping or
* as an object that has __getattr__ support.
*/
Datum
PLyObject_ToCompositeDatum(PLyTypeInfo *info, TupleDesc desc, PyObject *plrv)
{
Datum datum;
if (PyString_Check(plrv) || PyUnicode_Check(plrv))
datum = PLyString_ToComposite(info, desc, plrv);
else if (PySequence_Check(plrv))
/* composite type as sequence (tuple, list etc) */
datum = PLySequence_ToComposite(info, desc, plrv);
else if (PyMapping_Check(plrv))
/* composite type as mapping (currently only dict) */
datum = PLyMapping_ToComposite(info, desc, plrv);
else
/* returned as smth, must provide method __getattr__(name) */
datum = PLyGenericObject_ToComposite(info, desc, plrv);
return datum;
}
/*
* Convert a Python object to a composite type. First look up the type's
* description, then route the Python object through the conversion function
* for obtaining PostgreSQL tuples.
*/
static Datum
PLyObject_ToComposite(PLyObToDatum *arg, PyObject *plrv,
bool *isnull, bool inarray)
{
Datum rv;
TupleDesc desc;
if (plrv == Py_None)
{
*isnull = true;
return (Datum) 0;
}
*isnull = false;
/*
* The string conversion case doesn't require a tupdesc, nor per-field
* conversion data, so just go for it if that's the case to use.
*/
if (PyString_Check(plrv) || PyUnicode_Check(plrv))
return PLyString_ToComposite(arg, plrv, inarray);
/*
* If we're dealing with a named composite type, we must look up the
* tupdesc every time, to protect against possible changes to the type.
* RECORD types can't change between calls; but we must still be willing
* to set up the info the first time, if nobody did yet.
*/
if (arg->typoid != RECORDOID)
{
desc = lookup_rowtype_tupdesc(arg->typoid, arg->typmod);
/* We should have the descriptor of the type's typcache entry */
Assert(desc == arg->u.tuple.typentry->tupDesc);
/* Detect change of descriptor, update cache if needed */
if (arg->u.tuple.tupdescseq != arg->u.tuple.typentry->tupDescSeqNo)
{
PLy_output_setup_tuple(arg, desc,
PLy_current_execution_context()->curr_proc);
arg->u.tuple.tupdescseq = arg->u.tuple.typentry->tupDescSeqNo;
}
}
else
{
desc = arg->u.tuple.recdesc;
if (desc == NULL)
{
desc = lookup_rowtype_tupdesc(arg->typoid, arg->typmod);
arg->u.tuple.recdesc = desc;
}
else
{
/* Pin descriptor to match unpin below */
PinTupleDesc(desc);
}
}
/* Simple sanity check on our caching */
Assert(desc->natts == arg->u.tuple.natts);
/*
* Convert, using the appropriate method depending on the type of the
* supplied Python object.
*/
if (PySequence_Check(plrv))
/* composite type as sequence (tuple, list etc) */
rv = PLySequence_ToComposite(arg, desc, plrv);
else if (PyMapping_Check(plrv))
/* composite type as mapping (currently only dict) */
rv = PLyMapping_ToComposite(arg, desc, plrv);
else
/* returned as smth, must provide method __getattr__(name) */
rv = PLyGenericObject_ToComposite(arg, desc, plrv, inarray);
ReleaseTupleDesc(desc);
return rv;
}