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bpo-44042: sqlite3 begin transaction optimisations #25908

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Merged
merged 9 commits into from
Jun 3, 2021
Merged

bpo-44042: sqlite3 begin transaction optimisations #25908

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90bac9c
_pysqlite_connection_begin() now returns an int
May 4, 2021
916db29
Move _pysqlite_connection_begin to cursor.c
May 4, 2021
0f47667
Rename _pysqlite_connection_begin to begin_transaction
May 4, 2021
86d1ca0
PEP 7
May 4, 2021
891ebce
Defer error checking till post sqlite3_finalize()
May 7, 2021
393368f
Simplify error handling
May 7, 2021
4a7d9a1
Revert "Simplify error handling"
May 9, 2021
2d28a2a
Merge branch 'main' into sqlite-begin
Jun 3, 2021
5e64f35
Reduce unneeded if nesting
Jun 3, 2021
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36 changes: 0 additions & 36 deletions Modules/_sqlite/connection.c
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Original file line number Diff line number Diff line change
Expand Up @@ -405,42 +405,6 @@ int pysqlite_check_connection(pysqlite_Connection* con)
}
}

PyObject* _pysqlite_connection_begin(pysqlite_Connection* self)
{
int rc;
sqlite3_stmt* statement;

Py_BEGIN_ALLOW_THREADS
rc = sqlite3_prepare_v2(self->db, self->begin_statement, -1, &statement,
NULL);
Py_END_ALLOW_THREADS

if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db);
goto error;
}

rc = pysqlite_step(statement, self);
if (rc != SQLITE_DONE) {
_pysqlite_seterror(self->db);
}

Py_BEGIN_ALLOW_THREADS
rc = sqlite3_finalize(statement);
Py_END_ALLOW_THREADS

if (rc != SQLITE_OK && !PyErr_Occurred()) {
_pysqlite_seterror(self->db);
}

error:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_RETURN_NONE;
}
}

/*[clinic input]
_sqlite3.Connection.commit as pysqlite_connection_commit

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2 changes: 0 additions & 2 deletions Modules/_sqlite/connection.h
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Original file line number Diff line number Diff line change
Expand Up @@ -107,8 +107,6 @@ typedef struct

extern PyTypeObject *pysqlite_ConnectionType;

PyObject* _pysqlite_connection_begin(pysqlite_Connection* self);

int pysqlite_connection_register_cursor(pysqlite_Connection* connection, PyObject* cursor);
int pysqlite_check_thread(pysqlite_Connection* self);
int pysqlite_check_connection(pysqlite_Connection* con);
Expand Down
46 changes: 38 additions & 8 deletions Modules/_sqlite/cursor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -415,6 +415,38 @@ static int check_cursor(pysqlite_Cursor* cur)
return pysqlite_check_thread(cur->connection) && pysqlite_check_connection(cur->connection);
}

static int
begin_transaction(pysqlite_Connection *self)
{
int rc;
sqlite3_stmt *statement;

Py_BEGIN_ALLOW_THREADS
rc = sqlite3_prepare_v2(self->db, self->begin_statement, -1, &statement,
NULL);
Py_END_ALLOW_THREADS

if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db);
goto error;
}

Py_BEGIN_ALLOW_THREADS
sqlite3_step(statement);
rc = sqlite3_finalize(statement);
Py_END_ALLOW_THREADS

if (rc != SQLITE_OK && !PyErr_Occurred()) {
_pysqlite_seterror(self->db);
}

error:
if (PyErr_Occurred()) {
return -1;
}
return 0;
}

static PyObject *
get_statement_from_cache(pysqlite_Cursor *self, PyObject *operation)
{
Expand All @@ -431,7 +463,6 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation
PyObject* parameters = NULL;
int i;
int rc;
PyObject* result;
int numcols;
PyObject* column_name;
sqlite_int64 lastrowid;
Expand Down Expand Up @@ -515,13 +546,12 @@ _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject* operation

/* We start a transaction implicitly before a DML statement.
SELECT is the only exception. See #9924. */
if (self->connection->begin_statement && self->statement->is_dml) {
if (sqlite3_get_autocommit(self->connection->db)) {
result = _pysqlite_connection_begin(self->connection);
if (!result) {
goto error;
}
Py_DECREF(result);
if (self->connection->begin_statement
&& self->statement->is_dml
&& sqlite3_get_autocommit(self->connection->db))
{
if (begin_transaction(self->connection) < 0) {
goto error;
}
}

Expand Down