Quelle  plpy_planobject.c

/*
 * the PLyPlan class
 *
 * src/pl/plpython/plpy_planobject.c
 */

#include "postgres.h"

#include "plpy_cursorobject.h"
#include "plpy_planobject.h"
#include "plpy_spi.h"
#include "plpy_util.h"
#include "utils/memutils.h"

static void PLy_plan_dealloc(PLyPlanObject *self);
static PyObject *PLy_plan_cursor(PyObject *self, PyObject *args);
static PyObject *PLy_plan_execute(PyObject *self, PyObject *args);
static PyObject *PLy_plan_status(PyObject *self, PyObject *args);

static char PLy_plan_doc[] = "Store a PostgreSQL plan";

static PyMethodDef PLy_plan_methods[] = {
 {"cursor", PLy_plan_cursor, METH_VARARGS, NULL},
 {"execute", PLy_plan_execute, METH_VARARGS, NULL},
 {"status", PLy_plan_status, METH_VARARGS, NULL},
 {NULL, NULL, 0, NULL}
};

static PyType_Slot PLyPlan_slots[] =
{
 {
  Py_tp_dealloc, PLy_plan_dealloc
 },
 {
  Py_tp_doc, (char *) PLy_plan_doc
 },
 {
  Py_tp_methods, PLy_plan_methods
 },
 {
  0, NULL
 }
};

static PyType_Spec PLyPlan_spec =
{
 .name = "PLyPlan",
 .basicsize = sizeof(PLyPlanObject),
 .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 .slots = PLyPlan_slots,
};

static PyTypeObject *PLy_PlanType;

void
PLy_plan_init_type(void)
{
 PLy_PlanType = (PyTypeObject *) PyType_FromSpec(&PLyPlan_spec);
 if (!PLy_PlanType)
  elog(ERROR, "could not initialize PLy_PlanType");
}

PyObject *
PLy_plan_new(void)
{
 PLyPlanObject *ob;

 if ((ob = PyObject_New(PLyPlanObject, PLy_PlanType)) == NULL)
  return NULL;
#if PY_VERSION_HEX < 0x03080000
 /* Workaround for Python issue 35810; no longer necessary in Python 3.8 */
 Py_INCREF(PLy_PlanType);
#endif

 ob->plan = NULL;
 ob->nargs = 0;
 ob->types = NULL;
 ob->args = NULL;
 ob->mcxt = NULL;

 return (PyObject *) ob;
}

bool
is_PLyPlanObject(PyObject *ob)
{
 return ob->ob_type == PLy_PlanType;
}

static void
PLy_plan_dealloc(PLyPlanObject *self)
{
#if PY_VERSION_HEX >= 0x03080000
 PyTypeObject *tp = Py_TYPE(self);
#endif

 if (self->plan)
 {
  SPI_freeplan(self->plan);
  self->plan = NULL;
 }
 if (self->mcxt)
 {
  MemoryContextDelete(self->mcxt);
  self->mcxt = NULL;
 }

 PyObject_Free(self);
#if PY_VERSION_HEX >= 0x03080000
 /* This was not needed before Python 3.8 (Python issue 35810) */
 Py_DECREF(tp);
#endif
}


static PyObject *
PLy_plan_cursor(PyObject *self, PyObject *args)
{
 PyObject   *planargs = NULL;

 if (!PyArg_ParseTuple(args, "|O", &planargs))
  return NULL;

 return PLy_cursor_plan(self, planargs);
}


static PyObject *
PLy_plan_execute(PyObject *self, PyObject *args)
{
 PyObject   *list = NULL;
 long  limit = 0;

 if (!PyArg_ParseTuple(args, "|Ol", &list, &limit))
  return NULL;

 return PLy_spi_execute_plan(self, list, limit);
}


static PyObject *
PLy_plan_status(PyObject *self, PyObject *args)
{
 if (PyArg_ParseTuple(args, ":status"))
 {
  Py_INCREF(Py_True);
  return Py_True;
  /* return PyLong_FromLong(self->status); */
 }
 return NULL;
}