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/* cursor_int.c - code used by the cursor object
*
* Copyright (C) 2003-2019 Federico Di Gregorio <fog@debian.org>
* Copyright (C) 2020-2021 The Psycopg Team
*
* This file is part of psycopg.
*
* psycopg2 is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In addition, as a special exception, the copyright holders give
* permission to link this program with the OpenSSL library (or with
* modified versions of OpenSSL that use the same license as OpenSSL),
* and distribute linked combinations including the two.
*
* You must obey the GNU Lesser General Public License in all respects for
* all of the code used other than OpenSSL.
*
* psycopg2 is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*/
#define PSYCOPG_MODULE
#include "psycopg/psycopg.h"
#include "psycopg/cursor.h"
#include "psycopg/pqpath.h"
#include "psycopg/typecast.h"
/* curs_get_cast - return the type caster for an oid.
*
* Return the most specific type caster, from cursor to connection to global.
* If no type caster is found, return the default one.
*
* Return a borrowed reference.
*/
BORROWED PyObject *
curs_get_cast(cursorObject *self, PyObject *oid)
{
PyObject *cast;
/* cursor lookup */
if (self->string_types != NULL && self->string_types != Py_None) {
cast = PyDict_GetItem(self->string_types, oid);
Dprintf("curs_get_cast: per-cursor dict: %p", cast);
if (cast) { return cast; }
}
/* connection lookup */
cast = PyDict_GetItem(self->conn->string_types, oid);
Dprintf("curs_get_cast: per-connection dict: %p", cast);
if (cast) { return cast; }
/* global lookup */
cast = PyDict_GetItem(psyco_types, oid);
Dprintf("curs_get_cast: global dict: %p", cast);
if (cast) { return cast; }
/* fallback */
return psyco_default_cast;
}
#include <string.h>
/* curs_reset - reset the cursor to a clean state */
void
curs_reset(cursorObject *self)
{
/* initialize some variables to default values */
self->notuples = 1;
self->rowcount = -1;
self->row = 0;
Py_CLEAR(self->description);
Py_CLEAR(self->casts);
}
/* Return 1 if `obj` is a `psycopg2.sql.Composable` instance, else 0
* Set an exception and return -1 in case of error.
*/
RAISES_NEG static int
_curs_is_composible(PyObject *obj)
{
int rv = -1;
PyObject *m = NULL;
PyObject *comp = NULL;
if (!(m = PyImport_ImportModule("psycopg2.sql"))) { goto exit; }
if (!(comp = PyObject_GetAttrString(m, "Composable"))) { goto exit; }
rv = PyObject_IsInstance(obj, comp);
exit:
Py_XDECREF(comp);
Py_XDECREF(m);
return rv;
}
/* Performs very basic validation on an incoming SQL string.
* Returns a new reference to a str instance on success; NULL on failure,
* after having set an exception.
*/
PyObject *
curs_validate_sql_basic(cursorObject *self, PyObject *sql)
{
PyObject *rv = NULL;
PyObject *comp = NULL;
int iscomp;
if (!sql || !PyObject_IsTrue(sql)) {
psyco_set_error(ProgrammingError, self,
"can't execute an empty query");
goto exit;
}
if (Bytes_Check(sql)) {
/* Necessary for ref-count symmetry with the unicode case: */
Py_INCREF(sql);
rv = sql;
}
else if (PyUnicode_Check(sql)) {
if (!(rv = conn_encode(self->conn, sql))) { goto exit; }
}
else if (0 != (iscomp = _curs_is_composible(sql))) {
if (iscomp < 0) { goto exit; }
if (!(comp = PyObject_CallMethod(sql, "as_string", "O", self->conn))) {
goto exit;
}
if (Bytes_Check(comp)) {
rv = comp;
comp = NULL;
}
else if (PyUnicode_Check(comp)) {
if (!(rv = conn_encode(self->conn, comp))) { goto exit; }
}
else {
PyErr_Format(PyExc_TypeError,
"as_string() should return a string: got %s instead",
Py_TYPE(comp)->tp_name);
goto exit;
}
}
else {
/* the is not unicode or string, raise an error */
PyErr_Format(PyExc_TypeError,
"argument 1 must be a string or unicode object: got %s instead",
Py_TYPE(sql)->tp_name);
goto exit;
}
exit:
Py_XDECREF(comp);
return rv;
}
void
curs_set_result(cursorObject *self, PGresult *pgres)
{
PQclear(self->pgres);
self->pgres = pgres;
}
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