mirror of
https://github.com/python/cpython
synced 2024-09-05 00:05:39 +00:00
bpo-42862: Use functools.lru_cache iso. _sqlite.Cache in sqlite3 module (GH-24203)
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
This commit is contained in:
parent
f3fa63ec75
commit
f461a7fc3f
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@ -213,7 +213,7 @@ Module functions and constants
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The :mod:`sqlite3` module internally uses a statement cache to avoid SQL parsing
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overhead. If you want to explicitly set the number of statements that are cached
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for the connection, you can set the *cached_statements* parameter. The currently
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implemented default is to cache 100 statements.
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implemented default is to cache 128 statements.
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If *uri* is true, *database* is interpreted as a URI. This allows you
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to specify options. For example, to open a database in read-only mode
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@ -0,0 +1,4 @@
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:mod:`sqlite3` now utilizes :meth:`functools.lru_cache` to implement the
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connection statement cache. As a small optimisation, the default
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statement cache size has been increased from 100 to 128.
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Patch by Erlend E. Aasland.
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@ -1,344 +0,0 @@
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/* cache .c - a LRU cache
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*
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* Copyright (C) 2004-2010 Gerhard Häring <gh@ghaering.de>
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*
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* This file is part of pysqlite.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "cache.h"
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#include <limits.h>
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/* only used internally */
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static pysqlite_Node *
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pysqlite_new_node(PyObject *key, PyObject *data)
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{
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pysqlite_Node* node;
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node = (pysqlite_Node*) (pysqlite_NodeType->tp_alloc(pysqlite_NodeType, 0));
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if (!node) {
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return NULL;
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}
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node->key = Py_NewRef(key);
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node->data = Py_NewRef(data);
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node->prev = NULL;
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node->next = NULL;
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return node;
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}
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static int
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node_traverse(pysqlite_Node *self, visitproc visit, void *arg)
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{
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Py_VISIT(Py_TYPE(self));
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Py_VISIT(self->key);
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Py_VISIT(self->data);
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return 0;
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}
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static int
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node_clear(pysqlite_Node *self)
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{
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Py_CLEAR(self->key);
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Py_CLEAR(self->data);
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return 0;
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}
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static void
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pysqlite_node_dealloc(pysqlite_Node *self)
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{
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PyTypeObject *tp = Py_TYPE(self);
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PyObject_GC_UnTrack(self);
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tp->tp_clear((PyObject *)self);
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tp->tp_free(self);
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Py_DECREF(tp);
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}
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static int
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pysqlite_cache_init(pysqlite_Cache *self, PyObject *args, PyObject *kwargs)
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{
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PyObject* factory;
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int size = 10;
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self->factory = NULL;
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if (!PyArg_ParseTuple(args, "O|i", &factory, &size)) {
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return -1;
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}
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/* minimum cache size is 5 entries */
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if (size < 5) {
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size = 5;
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}
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self->size = size;
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self->first = NULL;
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self->last = NULL;
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self->mapping = PyDict_New();
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if (!self->mapping) {
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return -1;
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}
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self->factory = Py_NewRef(factory);
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return 0;
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}
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static int
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cache_traverse(pysqlite_Cache *self, visitproc visit, void *arg)
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{
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Py_VISIT(Py_TYPE(self));
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Py_VISIT(self->mapping);
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Py_VISIT(self->factory);
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pysqlite_Node *node = self->first;
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while (node) {
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Py_VISIT(node);
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node = node->next;
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}
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return 0;
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}
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static int
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cache_clear(pysqlite_Cache *self)
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{
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Py_CLEAR(self->mapping);
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Py_CLEAR(self->factory);
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/* iterate over all nodes and deallocate them */
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pysqlite_Node *node = self->first;
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self->first = NULL;
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while (node) {
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pysqlite_Node *delete_node = node;
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node = node->next;
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Py_CLEAR(delete_node);
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}
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return 0;
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}
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static void
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pysqlite_cache_dealloc(pysqlite_Cache *self)
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{
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if (!self->factory) {
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/* constructor failed, just get out of here */
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return;
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}
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PyObject_GC_UnTrack(self);
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PyTypeObject *tp = Py_TYPE(self);
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tp->tp_clear((PyObject *)self);
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tp->tp_free(self);
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Py_DECREF(tp);
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}
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PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* key)
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{
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pysqlite_Node* node;
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pysqlite_Node* ptr;
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PyObject* data;
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node = (pysqlite_Node*)PyDict_GetItemWithError(self->mapping, key);
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if (node) {
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/* an entry for this key already exists in the cache */
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/* increase usage counter of the node found */
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if (node->count < LONG_MAX) {
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node->count++;
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}
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/* if necessary, reorder entries in the cache by swapping positions */
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if (node->prev && node->count > node->prev->count) {
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ptr = node->prev;
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while (ptr->prev && node->count > ptr->prev->count) {
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ptr = ptr->prev;
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}
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if (node->next) {
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node->next->prev = node->prev;
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} else {
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self->last = node->prev;
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}
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if (node->prev) {
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node->prev->next = node->next;
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}
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if (ptr->prev) {
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ptr->prev->next = node;
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} else {
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self->first = node;
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}
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node->next = ptr;
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node->prev = ptr->prev;
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if (!node->prev) {
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self->first = node;
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}
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ptr->prev = node;
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}
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}
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else if (PyErr_Occurred()) {
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return NULL;
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}
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else {
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/* There is no entry for this key in the cache, yet. We'll insert a new
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* entry in the cache, and make space if necessary by throwing the
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* least used item out of the cache. */
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if (PyDict_GET_SIZE(self->mapping) == self->size) {
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if (self->last) {
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node = self->last;
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if (PyDict_DelItem(self->mapping, self->last->key) != 0) {
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return NULL;
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}
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if (node->prev) {
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node->prev->next = NULL;
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}
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self->last = node->prev;
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node->prev = NULL;
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Py_DECREF(node);
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}
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}
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/* We cannot replace this by PyObject_CallOneArg() since
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* PyObject_CallFunction() has a special case when using a
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* single tuple as argument. */
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data = PyObject_CallFunction(self->factory, "O", key);
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if (!data) {
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return NULL;
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}
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node = pysqlite_new_node(key, data);
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if (!node) {
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return NULL;
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}
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node->prev = self->last;
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Py_DECREF(data);
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if (PyDict_SetItem(self->mapping, key, (PyObject*)node) != 0) {
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Py_DECREF(node);
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return NULL;
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}
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if (self->last) {
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self->last->next = node;
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} else {
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self->first = node;
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}
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self->last = node;
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}
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return Py_NewRef(node->data);
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}
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static PyObject *
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pysqlite_cache_display(pysqlite_Cache *self, PyObject *args)
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{
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pysqlite_Node* ptr;
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PyObject* prevkey;
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PyObject* nextkey;
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PyObject* display_str;
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ptr = self->first;
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while (ptr) {
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if (ptr->prev) {
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prevkey = ptr->prev->key;
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} else {
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prevkey = Py_None;
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}
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if (ptr->next) {
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nextkey = ptr->next->key;
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} else {
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nextkey = Py_None;
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}
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display_str = PyUnicode_FromFormat("%S <- %S -> %S\n",
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prevkey, ptr->key, nextkey);
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if (!display_str) {
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return NULL;
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}
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PyObject_Print(display_str, stdout, Py_PRINT_RAW);
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Py_DECREF(display_str);
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ptr = ptr->next;
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}
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Py_RETURN_NONE;
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}
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static PyType_Slot node_slots[] = {
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{Py_tp_dealloc, pysqlite_node_dealloc},
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{Py_tp_traverse, node_traverse},
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{Py_tp_clear, node_clear},
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{0, NULL},
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};
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static PyType_Spec node_spec = {
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.name = MODULE_NAME ".Node",
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.basicsize = sizeof(pysqlite_Node),
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.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
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.slots = node_slots,
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};
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PyTypeObject *pysqlite_NodeType = NULL;
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static PyMethodDef cache_methods[] = {
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{"get", (PyCFunction)pysqlite_cache_get, METH_O,
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PyDoc_STR("Gets an entry from the cache or calls the factory function to produce one.")},
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{"display", (PyCFunction)pysqlite_cache_display, METH_NOARGS,
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PyDoc_STR("For debugging only.")},
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{NULL, NULL}
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};
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static PyType_Slot cache_slots[] = {
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{Py_tp_dealloc, pysqlite_cache_dealloc},
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{Py_tp_methods, cache_methods},
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{Py_tp_init, pysqlite_cache_init},
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{Py_tp_traverse, cache_traverse},
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{Py_tp_clear, cache_clear},
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{0, NULL},
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};
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static PyType_Spec cache_spec = {
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.name = MODULE_NAME ".Cache",
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.basicsize = sizeof(pysqlite_Cache),
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.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
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.slots = cache_slots,
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};
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PyTypeObject *pysqlite_CacheType = NULL;
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int
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pysqlite_cache_setup_types(PyObject *mod)
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{
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pysqlite_NodeType = (PyTypeObject *)PyType_FromModuleAndSpec(mod, &node_spec, NULL);
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if (pysqlite_NodeType == NULL) {
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return -1;
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}
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pysqlite_CacheType = (PyTypeObject *)PyType_FromModuleAndSpec(mod, &cache_spec, NULL);
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if (pysqlite_CacheType == NULL) {
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return -1;
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}
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return 0;
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}
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@ -1,64 +0,0 @@
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/* cache.h - definitions for the LRU cache
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*
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* Copyright (C) 2004-2010 Gerhard Häring <gh@ghaering.de>
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*
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* This file is part of pysqlite.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
|
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* in a product, an acknowledgment in the product documentation would be
|
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* appreciated but is not required.
|
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef PYSQLITE_CACHE_H
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#define PYSQLITE_CACHE_H
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#include "module.h"
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/* The LRU cache is implemented as a combination of a doubly-linked with a
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* dictionary. The list items are of type 'Node' and the dictionary has the
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* nodes as values. */
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typedef struct _pysqlite_Node
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{
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PyObject_HEAD
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PyObject* key;
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PyObject* data;
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long count;
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struct _pysqlite_Node* prev;
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struct _pysqlite_Node* next;
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} pysqlite_Node;
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typedef struct
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{
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PyObject_HEAD
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int size;
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/* a dictionary mapping keys to Node entries */
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PyObject* mapping;
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/* the factory callable */
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PyObject* factory;
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pysqlite_Node* first;
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pysqlite_Node* last;
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} pysqlite_Cache;
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extern PyTypeObject *pysqlite_NodeType;
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extern PyTypeObject *pysqlite_CacheType;
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PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* args);
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int pysqlite_cache_setup_types(PyObject *module);
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#endif
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@ -21,7 +21,6 @@
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "cache.h"
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#include "module.h"
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#include "structmember.h" // PyMemberDef
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#include "connection.h"
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|
@ -57,6 +56,26 @@ static const char * const begin_statements[] = {
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static int pysqlite_connection_set_isolation_level(pysqlite_Connection* self, PyObject* isolation_level, void *Py_UNUSED(ignored));
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static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self);
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static PyObject *
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new_statement_cache(pysqlite_Connection *self, int maxsize)
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{
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PyObject *args[] = { PyLong_FromLong(maxsize), };
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if (args[0] == NULL) {
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return NULL;
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}
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pysqlite_state *state = pysqlite_get_state(NULL);
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PyObject *inner = PyObject_Vectorcall(state->lru_cache, args, 1, NULL);
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Py_DECREF(args[0]);
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if (inner == NULL) {
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return NULL;
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}
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args[0] = (PyObject *)self; // Borrowed ref.
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PyObject *res = PyObject_Vectorcall(inner, args, 1, NULL);
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Py_DECREF(inner);
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return res;
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}
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static int
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pysqlite_connection_init(pysqlite_Connection *self, PyObject *args,
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PyObject *kwargs)
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|
@ -73,7 +92,7 @@ pysqlite_connection_init(pysqlite_Connection *self, PyObject *args,
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PyObject* isolation_level = NULL;
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PyObject* factory = NULL;
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int check_same_thread = 1;
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int cached_statements = 100;
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int cached_statements = 128;
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int uri = 0;
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double timeout = 5.0;
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int rc;
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|
@ -134,7 +153,10 @@ pysqlite_connection_init(pysqlite_Connection *self, PyObject *args,
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}
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Py_DECREF(isolation_level);
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self->statement_cache = (pysqlite_Cache*)PyObject_CallFunction((PyObject*)pysqlite_CacheType, "Oi", self, cached_statements);
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self->statement_cache = new_statement_cache(self, cached_statements);
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if (self->statement_cache == NULL) {
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return -1;
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}
|
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if (PyErr_Occurred()) {
|
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return -1;
|
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}
|
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|
|
|
@ -28,7 +28,6 @@
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#include "pythread.h"
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#include "structmember.h"
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|
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#include "cache.h"
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#include "module.h"
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|
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#include "sqlite3.h"
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|
@ -64,7 +63,7 @@ typedef struct
|
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/* thread identification of the thread the connection was created in */
|
||||
unsigned long thread_ident;
|
||||
|
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pysqlite_Cache* statement_cache;
|
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PyObject *statement_cache;
|
||||
|
||||
/* Lists of weak references to statements and cursors used within this connection */
|
||||
PyObject* statements;
|
||||
|
|
|
@ -415,6 +415,14 @@ static int check_cursor(pysqlite_Cursor* cur)
|
|||
return pysqlite_check_thread(cur->connection) && pysqlite_check_connection(cur->connection);
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
get_statement_from_cache(pysqlite_Cursor *self, PyObject *operation)
|
||||
{
|
||||
PyObject *args[] = { operation, };
|
||||
PyObject *cache = self->connection->statement_cache;
|
||||
return PyObject_Vectorcall(cache, args, 1, NULL);
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
_pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation, PyObject* second_argument)
|
||||
{
|
||||
|
@ -423,7 +431,6 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
|
|||
PyObject* parameters = NULL;
|
||||
int i;
|
||||
int rc;
|
||||
PyObject* func_args;
|
||||
PyObject* result;
|
||||
int numcols;
|
||||
PyObject* column_name;
|
||||
|
@ -485,22 +492,12 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
|
|||
Py_SETREF(self->description, Py_None);
|
||||
self->rowcount = 0L;
|
||||
|
||||
func_args = PyTuple_New(1);
|
||||
if (!func_args) {
|
||||
goto error;
|
||||
}
|
||||
if (PyTuple_SetItem(func_args, 0, Py_NewRef(operation)) != 0) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (self->statement) {
|
||||
(void)pysqlite_statement_reset(self->statement);
|
||||
}
|
||||
|
||||
Py_XSETREF(self->statement,
|
||||
(pysqlite_Statement *)pysqlite_cache_get(self->connection->statement_cache, func_args));
|
||||
Py_DECREF(func_args);
|
||||
|
||||
PyObject *stmt = get_statement_from_cache(self, operation);
|
||||
Py_XSETREF(self->statement, (pysqlite_Statement *)stmt);
|
||||
if (!self->statement) {
|
||||
goto error;
|
||||
}
|
||||
|
|
|
@ -24,7 +24,6 @@
|
|||
#include "connection.h"
|
||||
#include "statement.h"
|
||||
#include "cursor.h"
|
||||
#include "cache.h"
|
||||
#include "prepare_protocol.h"
|
||||
#include "microprotocols.h"
|
||||
#include "row.h"
|
||||
|
@ -56,6 +55,14 @@ PyObject* _pysqlite_converters = NULL;
|
|||
int _pysqlite_enable_callback_tracebacks = 0;
|
||||
int pysqlite_BaseTypeAdapted = 0;
|
||||
|
||||
pysqlite_state pysqlite_global_state;
|
||||
|
||||
pysqlite_state *
|
||||
pysqlite_get_state(PyObject *Py_UNUSED(module))
|
||||
{
|
||||
return &pysqlite_global_state;
|
||||
}
|
||||
|
||||
static PyObject* module_connect(PyObject* self, PyObject* args, PyObject*
|
||||
kwargs)
|
||||
{
|
||||
|
@ -261,6 +268,23 @@ static int converters_init(PyObject* module)
|
|||
return res;
|
||||
}
|
||||
|
||||
static int
|
||||
load_functools_lru_cache(PyObject *module)
|
||||
{
|
||||
PyObject *functools = PyImport_ImportModule("functools");
|
||||
if (functools == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
pysqlite_state *state = pysqlite_get_state(module);
|
||||
state->lru_cache = PyObject_GetAttrString(functools, "lru_cache");
|
||||
Py_DECREF(functools);
|
||||
if (state->lru_cache == NULL) {
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static PyMethodDef module_methods[] = {
|
||||
{"connect", (PyCFunction)(void(*)(void))module_connect,
|
||||
METH_VARARGS | METH_KEYWORDS, module_connect_doc},
|
||||
|
@ -373,7 +397,6 @@ PyMODINIT_FUNC PyInit__sqlite3(void)
|
|||
(pysqlite_row_setup_types(module) < 0) ||
|
||||
(pysqlite_cursor_setup_types(module) < 0) ||
|
||||
(pysqlite_connection_setup_types(module) < 0) ||
|
||||
(pysqlite_cache_setup_types(module) < 0) ||
|
||||
(pysqlite_statement_setup_types(module) < 0) ||
|
||||
(pysqlite_prepare_protocol_setup_types(module) < 0)
|
||||
) {
|
||||
|
@ -424,6 +447,10 @@ PyMODINIT_FUNC PyInit__sqlite3(void)
|
|||
goto error;
|
||||
}
|
||||
|
||||
if (load_functools_lru_cache(module) < 0) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
return module;
|
||||
|
||||
error:
|
||||
|
|
|
@ -29,6 +29,12 @@
|
|||
#define PYSQLITE_VERSION "2.6.0"
|
||||
#define MODULE_NAME "sqlite3"
|
||||
|
||||
typedef struct {
|
||||
PyObject *lru_cache;
|
||||
} pysqlite_state;
|
||||
|
||||
extern pysqlite_state *pysqlite_get_state(PyObject *module);
|
||||
|
||||
extern PyObject* pysqlite_Error;
|
||||
extern PyObject* pysqlite_Warning;
|
||||
extern PyObject* pysqlite_InterfaceError;
|
||||
|
|
|
@ -97,7 +97,6 @@
|
|||
</ClCompile>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemGroup>
|
||||
<ClInclude Include="..\Modules\_sqlite\cache.h" />
|
||||
<ClInclude Include="..\Modules\_sqlite\connection.h" />
|
||||
<ClInclude Include="..\Modules\_sqlite\cursor.h" />
|
||||
<ClInclude Include="..\Modules\_sqlite\microprotocols.h" />
|
||||
|
@ -108,7 +107,6 @@
|
|||
<ClInclude Include="..\Modules\_sqlite\util.h" />
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="..\Modules\_sqlite\cache.c" />
|
||||
<ClCompile Include="..\Modules\_sqlite\connection.c" />
|
||||
<ClCompile Include="..\Modules\_sqlite\cursor.c" />
|
||||
<ClCompile Include="..\Modules\_sqlite\microprotocols.c" />
|
||||
|
|
|
@ -12,9 +12,6 @@
|
|||
</Filter>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClInclude Include="..\Modules\_sqlite\cache.h">
|
||||
<Filter>Header Files</Filter>
|
||||
</ClInclude>
|
||||
<ClInclude Include="..\Modules\_sqlite\connection.h">
|
||||
<Filter>Header Files</Filter>
|
||||
</ClInclude>
|
||||
|
@ -41,9 +38,6 @@
|
|||
</ClInclude>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="..\Modules\_sqlite\cache.c">
|
||||
<Filter>Source Files</Filter>
|
||||
</ClCompile>
|
||||
<ClCompile Include="..\Modules\_sqlite\connection.c">
|
||||
<Filter>Source Files</Filter>
|
||||
</ClCompile>
|
||||
|
|
Loading…
Reference in a new issue