mirror of
https://github.com/python/cpython.git
synced 2025-08-03 16:39:00 +00:00
bpo-44079: Strip superfluous statement cache from sqlite3.Connection (GH-25998)
This commit is contained in:
Erlend Egeberg Aasland
GitHub
parent
b2f68b1900
commit
243b6c3b8f
4 changed files with 18 additions and 116 deletions
|
|
@ -29,9 +29,6 @@
|
|||
#include "prepare_protocol.h"
|
||||
#include "util.h"
|
||||
|
||||
#define ACTION_FINALIZE 1
|
||||
#define ACTION_RESET 2
|
||||
|
||||
#if SQLITE_VERSION_NUMBER >= 3014000
|
||||
#define HAVE_TRACE_V2
|
||||
#endif
|
||||
|
|
@ -114,7 +111,6 @@ pysqlite_connection_init_impl(pysqlite_Connection *self,
|
|||
self->begin_statement = NULL;
|
||||
|
||||
Py_CLEAR(self->statement_cache);
|
||||
Py_CLEAR(self->statements);
|
||||
Py_CLEAR(self->cursors);
|
||||
|
||||
Py_INCREF(Py_None);
|
||||
|
|
@ -159,13 +155,11 @@ pysqlite_connection_init_impl(pysqlite_Connection *self,
|
|||
return -1;
|
||||
}
|
||||
|
||||
self->created_statements = 0;
|
||||
self->created_cursors = 0;
|
||||
|
||||
/* Create lists of weak references to statements/cursors */
|
||||
self->statements = PyList_New(0);
|
||||
/* Create list of weak references to cursors */
|
||||
self->cursors = PyList_New(0);
|
||||
if (!self->statements || !self->cursors) {
|
||||
if (self->cursors == NULL) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
|
@ -198,37 +192,24 @@ pysqlite_connection_init_impl(pysqlite_Connection *self,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* action in (ACTION_RESET, ACTION_FINALIZE) */
|
||||
static void
|
||||
pysqlite_do_all_statements(pysqlite_Connection *self, int action,
|
||||
int reset_cursors)
|
||||
pysqlite_do_all_statements(pysqlite_Connection *self)
|
||||
{
|
||||
int i;
|
||||
PyObject* weakref;
|
||||
PyObject* statement;
|
||||
pysqlite_Cursor* cursor;
|
||||
|
||||
for (i = 0; i < PyList_Size(self->statements); i++) {
|
||||
weakref = PyList_GetItem(self->statements, i);
|
||||
statement = PyWeakref_GetObject(weakref);
|
||||
if (statement != Py_None) {
|
||||
Py_INCREF(statement);
|
||||
if (action == ACTION_RESET) {
|
||||
(void)pysqlite_statement_reset((pysqlite_Statement*)statement);
|
||||
} else {
|
||||
(void)pysqlite_statement_finalize((pysqlite_Statement*)statement);
|
||||
}
|
||||
Py_DECREF(statement);
|
||||
// Reset all statements
|
||||
sqlite3_stmt *stmt = NULL;
|
||||
while ((stmt = sqlite3_next_stmt(self->db, stmt))) {
|
||||
if (sqlite3_stmt_busy(stmt)) {
|
||||
(void)sqlite3_reset(stmt);
|
||||
}
|
||||
}
|
||||
|
||||
if (reset_cursors) {
|
||||
for (i = 0; i < PyList_Size(self->cursors); i++) {
|
||||
weakref = PyList_GetItem(self->cursors, i);
|
||||
cursor = (pysqlite_Cursor*)PyWeakref_GetObject(weakref);
|
||||
if ((PyObject*)cursor != Py_None) {
|
||||
cursor->reset = 1;
|
||||
}
|
||||
// Reset all cursors
|
||||
for (int i = 0; i < PyList_Size(self->cursors); i++) {
|
||||
PyObject *weakref = PyList_GetItem(self->cursors, i);
|
||||
PyObject *object = PyWeakref_GetObject(weakref);
|
||||
if (object != Py_None) {
|
||||
pysqlite_Cursor *cursor = (pysqlite_Cursor *)object;
|
||||
cursor->reset = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -239,7 +220,6 @@ connection_traverse(pysqlite_Connection *self, visitproc visit, void *arg)
|
|||
Py_VISIT(Py_TYPE(self));
|
||||
Py_VISIT(self->isolation_level);
|
||||
Py_VISIT(self->statement_cache);
|
||||
Py_VISIT(self->statements);
|
||||
Py_VISIT(self->cursors);
|
||||
Py_VISIT(self->row_factory);
|
||||
Py_VISIT(self->text_factory);
|
||||
|
|
@ -254,7 +234,6 @@ connection_clear(pysqlite_Connection *self)
|
|||
{
|
||||
Py_CLEAR(self->isolation_level);
|
||||
Py_CLEAR(self->statement_cache);
|
||||
Py_CLEAR(self->statements);
|
||||
Py_CLEAR(self->cursors);
|
||||
Py_CLEAR(self->row_factory);
|
||||
Py_CLEAR(self->text_factory);
|
||||
|
|
@ -378,7 +357,7 @@ pysqlite_connection_close_impl(pysqlite_Connection *self)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
pysqlite_do_all_statements(self, ACTION_FINALIZE, 1);
|
||||
Py_CLEAR(self->statement_cache);
|
||||
connection_close(self);
|
||||
|
||||
Py_RETURN_NONE;
|
||||
|
|
@ -474,7 +453,7 @@ pysqlite_connection_rollback_impl(pysqlite_Connection *self)
|
|||
}
|
||||
|
||||
if (!sqlite3_get_autocommit(self->db)) {
|
||||
pysqlite_do_all_statements(self, ACTION_RESET, 1);
|
||||
pysqlite_do_all_statements(self);
|
||||
|
||||
Py_BEGIN_ALLOW_THREADS
|
||||
rc = sqlite3_prepare_v2(self->db, "ROLLBACK", 9, &statement, NULL);
|
||||
|
|
@ -774,37 +753,6 @@ error:
|
|||
PyGILState_Release(threadstate);
|
||||
}
|
||||
|
||||
static void _pysqlite_drop_unused_statement_references(pysqlite_Connection* self)
|
||||
{
|
||||
PyObject* new_list;
|
||||
PyObject* weakref;
|
||||
int i;
|
||||
|
||||
/* we only need to do this once in a while */
|
||||
if (self->created_statements++ < 200) {
|
||||
return;
|
||||
}
|
||||
|
||||
self->created_statements = 0;
|
||||
|
||||
new_list = PyList_New(0);
|
||||
if (!new_list) {
|
||||
return;
|
||||
}
|
||||
|
||||
for (i = 0; i < PyList_Size(self->statements); i++) {
|
||||
weakref = PyList_GetItem(self->statements, i);
|
||||
if (PyWeakref_GetObject(weakref) != Py_None) {
|
||||
if (PyList_Append(new_list, weakref) != 0) {
|
||||
Py_DECREF(new_list);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Py_SETREF(self->statements, new_list);
|
||||
}
|
||||
|
||||
static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self)
|
||||
{
|
||||
PyObject* new_list;
|
||||
|
|
@ -1358,7 +1306,6 @@ pysqlite_connection_call(pysqlite_Connection *self, PyObject *args,
|
|||
{
|
||||
PyObject* sql;
|
||||
pysqlite_Statement* statement;
|
||||
PyObject* weakref;
|
||||
|
||||
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
|
||||
return NULL;
|
||||
|
|
@ -1370,27 +1317,12 @@ pysqlite_connection_call(pysqlite_Connection *self, PyObject *args,
|
|||
if (!PyArg_ParseTuple(args, "U", &sql))
|
||||
return NULL;
|
||||
|
||||
_pysqlite_drop_unused_statement_references(self);
|
||||
|
||||
statement = pysqlite_statement_create(self, sql);
|
||||
if (statement == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
weakref = PyWeakref_NewRef((PyObject*)statement, NULL);
|
||||
if (weakref == NULL)
|
||||
goto error;
|
||||
if (PyList_Append(self->statements, weakref) != 0) {
|
||||
Py_DECREF(weakref);
|
||||
goto error;
|
||||
}
|
||||
Py_DECREF(weakref);
|
||||
|
||||
return (PyObject*)statement;
|
||||
|
||||
error:
|
||||
Py_DECREF(statement);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*[clinic input]
|
||||
|
|
|
|||
|
|
@ -60,12 +60,10 @@ typedef struct
|
|||
PyObject *statement_cache;
|
||||
|
||||
/* Lists of weak references to statements and cursors used within this connection */
|
||||
PyObject* statements;
|
||||
PyObject* cursors;
|
||||
|
||||
/* Counters for how many statements/cursors were created in the connection. May be
|
||||
/* Counters for how many cursors were created in the connection. May be
|
||||
* reset to 0 at certain intervals */
|
||||
int created_statements;
|
||||
int created_cursors;
|
||||
|
||||
PyObject* row_factory;
|
||||
|
|
|
|||
|
|
@ -118,7 +118,6 @@ pysqlite_statement_create(pysqlite_Connection *connection, PyObject *sql)
|
|||
self->st = stmt;
|
||||
self->in_use = 0;
|
||||
self->is_dml = is_dml;
|
||||
self->in_weakreflist = NULL;
|
||||
|
||||
PyObject_GC_Track(self);
|
||||
return self;
|
||||
|
|
@ -361,23 +360,6 @@ pysqlite_statement_bind_parameters(pysqlite_state *state,
|
|||
}
|
||||
}
|
||||
|
||||
int pysqlite_statement_finalize(pysqlite_Statement* self)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = SQLITE_OK;
|
||||
if (self->st) {
|
||||
Py_BEGIN_ALLOW_THREADS
|
||||
rc = sqlite3_finalize(self->st);
|
||||
Py_END_ALLOW_THREADS
|
||||
self->st = NULL;
|
||||
}
|
||||
|
||||
self->in_use = 0;
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int pysqlite_statement_reset(pysqlite_Statement* self)
|
||||
{
|
||||
int rc;
|
||||
|
|
@ -407,9 +389,6 @@ stmt_dealloc(pysqlite_Statement *self)
|
|||
{
|
||||
PyTypeObject *tp = Py_TYPE(self);
|
||||
PyObject_GC_UnTrack(self);
|
||||
if (self->in_weakreflist != NULL) {
|
||||
PyObject_ClearWeakRefs((PyObject*)self);
|
||||
}
|
||||
if (self->st) {
|
||||
Py_BEGIN_ALLOW_THREADS
|
||||
sqlite3_finalize(self->st);
|
||||
|
|
@ -497,12 +476,7 @@ static int pysqlite_check_remaining_sql(const char* tail)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static PyMemberDef stmt_members[] = {
|
||||
{"__weaklistoffset__", T_PYSSIZET, offsetof(pysqlite_Statement, in_weakreflist), READONLY},
|
||||
{NULL},
|
||||
};
|
||||
static PyType_Slot stmt_slots[] = {
|
||||
{Py_tp_members, stmt_members},
|
||||
{Py_tp_dealloc, stmt_dealloc},
|
||||
{Py_tp_traverse, stmt_traverse},
|
||||
{0, NULL},
|
||||
|
|
|
|||
|
|
@ -35,7 +35,6 @@ typedef struct
|
|||
sqlite3_stmt* st;
|
||||
int in_use;
|
||||
int is_dml;
|
||||
PyObject* in_weakreflist; /* List of weak references */
|
||||
} pysqlite_Statement;
|
||||
|
||||
pysqlite_Statement *pysqlite_statement_create(pysqlite_Connection *connection, PyObject *sql);
|
||||
|
|
@ -45,7 +44,6 @@ void pysqlite_statement_bind_parameters(pysqlite_state *state,
|
|||
pysqlite_Statement *self,
|
||||
PyObject *parameters);
|
||||
|
||||
int pysqlite_statement_finalize(pysqlite_Statement* self);
|
||||
int pysqlite_statement_reset(pysqlite_Statement* self);
|
||||
void pysqlite_statement_mark_dirty(pysqlite_Statement* self);
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue