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gh-89121: Keep the number of pending SQLite statements to a minimum #30379

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Merged
merged 8 commits into from
Jun 23, 2022
Merged

gh-89121: Keep the number of pending SQLite statements to a minimum #30379

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de2299c
bpo-44958: Always reset SQLite statements when we're done with them
Sep 23, 2021
04c6739
Merge branch 'main' into sqlite-reset
Jan 22, 2022
1bbfff0
Merge branch 'main' into sqlite-reset
Feb 27, 2022
6d46307
Sync with main
erlend-aasland May 3, 2022
7d8cbe2
Merge branch 'main' into sqlite-reset
erlend-aasland Jun 20, 2022
317607b
Fix merge
erlend-aasland Jun 20, 2022
12bb96e
Reset in iternext on error path
erlend-aasland Jun 20, 2022
89727fe
Merge branch 'main' into sqlite-reset
erlend-aasland Jun 21, 2022
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34 changes: 12 additions & 22 deletions Modules/_sqlite/cursor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -830,16 +830,12 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
}
}

if (self->statement != NULL) {
/* There is an active statement */
stmt_reset(self->statement);
}

/* reset description */
Py_INCREF(Py_None);
Py_SETREF(self->description, Py_None);

if (self->statement) {
// Reset pending statements on this cursor.
(void)stmt_reset(self->statement);
}

Expand Down Expand Up @@ -879,6 +875,7 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
}
}

assert(!sqlite3_stmt_busy(self->statement->st));
while (1) {
parameters = PyIter_Next(parameters_iter);
if (!parameters) {
Expand All @@ -902,7 +899,6 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
PyErr_Clear();
}
}
(void)stmt_reset(self->statement);
_pysqlite_seterror(state, self->connection->db);
goto error;
}
Expand Down Expand Up @@ -944,16 +940,8 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
}
}

if (rc == SQLITE_DONE && !multiple) {
if (rc == SQLITE_DONE) {
if (self->statement->is_dml) {
self->rowcount = (long)sqlite3_changes(self->connection->db);
}
stmt_reset(self->statement);
Py_CLEAR(self->statement);
}

if (multiple) {
if (self->statement->is_dml && rc == SQLITE_DONE) {
self->rowcount += (long)sqlite3_changes(self->connection->db);
}
stmt_reset(self->statement);
Expand All @@ -980,11 +968,17 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
self->locked = 0;

if (PyErr_Occurred()) {
if (self->statement) {
(void)stmt_reset(self->statement);
Py_CLEAR(self->statement);
}
self->rowcount = -1L;
return NULL;
} else {
return Py_NewRef((PyObject *)self);
}
if (self->statement && !sqlite3_stmt_busy(self->statement->st)) {
Py_CLEAR(self->statement);
}
return Py_NewRef((PyObject *)self);
}

/*[clinic input]
Expand Down Expand Up @@ -1111,11 +1105,7 @@ pysqlite_cursor_iternext(pysqlite_Cursor *self)

sqlite3_stmt *stmt = self->statement->st;
assert(stmt != NULL);
if (sqlite3_data_count(stmt) == 0) {
(void)stmt_reset(self->statement);
Py_CLEAR(self->statement);
return NULL;
}
assert(sqlite3_data_count(stmt) != 0);

self->locked = 1; // GH-80254: Prevent recursive use of cursors.
PyObject *row = _pysqlite_fetch_one_row(self);
Expand Down