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cpython/Modules/_sqlite/connection.c

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/* connection.c - the connection type
*
* Copyright (C) 2004-2010 Gerhard Häring <gh@ghaering.de>
*
* This file is part of pysqlite.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "cache.h"
#include "module.h"
#include "structmember.h"
#include "connection.h"
#include "statement.h"
#include "cursor.h"
#include "prepare_protocol.h"
#include "util.h"
#include "pythread.h"
#define ACTION_FINALIZE 1
#define ACTION_RESET 2
#if SQLITE_VERSION_NUMBER >= 3003008
#ifndef SQLITE_OMIT_LOAD_EXTENSION
#define HAVE_LOAD_EXTENSION
#endif
#endif
_Py_IDENTIFIER(cursor);
static const char * const begin_statements[] = {
"BEGIN ",
"BEGIN DEFERRED",
"BEGIN IMMEDIATE",
"BEGIN EXCLUSIVE",
NULL
};
static int pysqlite_connection_set_isolation_level(pysqlite_Connection* self, PyObject* isolation_level);
static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self);
static void _sqlite3_result_error(sqlite3_context* ctx, const char* errmsg, int len)
{
/* in older SQLite versions, calling sqlite3_result_error in callbacks
* triggers a bug in SQLite that leads either to irritating results or
* segfaults, depending on the SQLite version */
#if SQLITE_VERSION_NUMBER >= 3003003
sqlite3_result_error(ctx, errmsg, len);
#else
PyErr_SetString(pysqlite_OperationalError, errmsg);
#endif
}
int pysqlite_connection_init(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
static char *kwlist[] = {
"database", "timeout", "detect_types", "isolation_level",
"check_same_thread", "factory", "cached_statements", "uri",
NULL
};
char* database;
int detect_types = 0;
PyObject* isolation_level = NULL;
PyObject* factory = NULL;
int check_same_thread = 1;
int cached_statements = 100;
int uri = 0;
double timeout = 5.0;
int rc;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|diOiOip", kwlist,
&database, &timeout, &detect_types,
&isolation_level, &check_same_thread,
&factory, &cached_statements, &uri))
{
return -1;
}
self->initialized = 1;
self->begin_statement = NULL;
self->statement_cache = NULL;
self->statements = NULL;
self->cursors = NULL;
Py_INCREF(Py_None);
self->row_factory = Py_None;
Py_INCREF(&PyUnicode_Type);
self->text_factory = (PyObject*)&PyUnicode_Type;
#ifdef SQLITE_OPEN_URI
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_open_v2(database, &self->db,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
(uri ? SQLITE_OPEN_URI : 0), NULL);
#else
if (uri) {
PyErr_SetString(pysqlite_NotSupportedError, "URIs not supported");
return -1;
}
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_open(database, &self->db);
#endif
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db, NULL);
return -1;
}
if (!isolation_level) {
isolation_level = PyUnicode_FromString("");
if (!isolation_level) {
return -1;
}
} else {
Py_INCREF(isolation_level);
}
self->isolation_level = NULL;
if (pysqlite_connection_set_isolation_level(self, isolation_level) < 0) {
Py_DECREF(isolation_level);
return -1;
}
Py_DECREF(isolation_level);
self->statement_cache = (pysqlite_Cache*)PyObject_CallFunction((PyObject*)&pysqlite_CacheType, "Oi", self, cached_statements);
if (PyErr_Occurred()) {
return -1;
}
self->created_statements = 0;
self->created_cursors = 0;
/* Create lists of weak references to statements/cursors */
self->statements = PyList_New(0);
self->cursors = PyList_New(0);
if (!self->statements || !self->cursors) {
return -1;
}
/* By default, the Cache class INCREFs the factory in its initializer, and
* decrefs it in its deallocator method. Since this would create a circular
* reference here, we're breaking it by decrementing self, and telling the
* cache class to not decref the factory (self) in its deallocator.
*/
self->statement_cache->decref_factory = 0;
Py_DECREF(self);
self->detect_types = detect_types;
self->timeout = timeout;
(void)sqlite3_busy_timeout(self->db, (int)(timeout*1000));
#ifdef WITH_THREAD
self->thread_ident = PyThread_get_thread_ident();
#endif
if (!check_same_thread && sqlite3_libversion_number() < 3003001) {
PyErr_SetString(pysqlite_NotSupportedError, "shared connections not available");
return -1;
}
self->check_same_thread = check_same_thread;
self->function_pinboard = PyDict_New();
if (!self->function_pinboard) {
return -1;
}
self->collations = PyDict_New();
if (!self->collations) {
return -1;
}
self->Warning = pysqlite_Warning;
self->Error = pysqlite_Error;
self->InterfaceError = pysqlite_InterfaceError;
self->DatabaseError = pysqlite_DatabaseError;
self->DataError = pysqlite_DataError;
self->OperationalError = pysqlite_OperationalError;
self->IntegrityError = pysqlite_IntegrityError;
self->InternalError = pysqlite_InternalError;
self->ProgrammingError = pysqlite_ProgrammingError;
self->NotSupportedError = pysqlite_NotSupportedError;
return 0;
}
/* action in (ACTION_RESET, ACTION_FINALIZE) */
void pysqlite_do_all_statements(pysqlite_Connection* self, int action, int reset_cursors)
{
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);
}
}
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;
}
}
}
}
void pysqlite_connection_dealloc(pysqlite_Connection* self)
{
Py_XDECREF(self->statement_cache);
/* Clean up if user has not called .close() explicitly. */
if (self->db) {
Py_BEGIN_ALLOW_THREADS
sqlite3_close(self->db);
Py_END_ALLOW_THREADS
}
Py_XDECREF(self->isolation_level);
Py_XDECREF(self->function_pinboard);
Py_XDECREF(self->row_factory);
Py_XDECREF(self->text_factory);
Py_XDECREF(self->collations);
Py_XDECREF(self->statements);
Py_XDECREF(self->cursors);
Py_TYPE(self)->tp_free((PyObject*)self);
}
/*
* Registers a cursor with the connection.
*
* 0 => error; 1 => ok
*/
int pysqlite_connection_register_cursor(pysqlite_Connection* connection, PyObject* cursor)
{
PyObject* weakref;
weakref = PyWeakref_NewRef((PyObject*)cursor, NULL);
if (!weakref) {
goto error;
}
if (PyList_Append(connection->cursors, weakref) != 0) {
Py_CLEAR(weakref);
goto error;
}
Py_DECREF(weakref);
return 1;
error:
return 0;
}
PyObject* pysqlite_connection_cursor(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
static char *kwlist[] = {"factory", NULL};
PyObject* factory = NULL;
PyObject* cursor;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O", kwlist,
&factory)) {
return NULL;
}
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (factory == NULL) {
factory = (PyObject*)&pysqlite_CursorType;
}
cursor = PyObject_CallFunctionObjArgs(factory, (PyObject *)self, NULL);
if (cursor == NULL)
return NULL;
if (!PyObject_TypeCheck(cursor, &pysqlite_CursorType)) {
PyErr_Format(PyExc_TypeError,
"factory must return a cursor, not %.100s",
Py_TYPE(cursor)->tp_name);
Py_DECREF(cursor);
return NULL;
}
_pysqlite_drop_unused_cursor_references(self);
if (cursor && self->row_factory != Py_None) {
Py_INCREF(self->row_factory);
Py_XSETREF(((pysqlite_Cursor *)cursor)->row_factory, self->row_factory);
}
return cursor;
}
PyObject* pysqlite_connection_close(pysqlite_Connection* self, PyObject* args)
{
int rc;
if (!pysqlite_check_thread(self)) {
return NULL;
}
pysqlite_do_all_statements(self, ACTION_FINALIZE, 1);
if (self->db) {
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_close(self->db);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db, NULL);
return NULL;
} else {
self->db = NULL;
}
}
Py_RETURN_NONE;
}
/*
* Checks if a connection object is usable (i. e. not closed).
*
* 0 => error; 1 => ok
*/
int pysqlite_check_connection(pysqlite_Connection* con)
{
if (!con->initialized) {
PyErr_SetString(pysqlite_ProgrammingError, "Base Connection.__init__ not called.");
return 0;
}
if (!con->db) {
PyErr_SetString(pysqlite_ProgrammingError, "Cannot operate on a closed database.");
return 0;
} else {
return 1;
}
}
PyObject* _pysqlite_connection_begin(pysqlite_Connection* self)
{
int rc;
const char* tail;
sqlite3_stmt* statement;
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_prepare(self->db, self->begin_statement, -1, &statement, &tail);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db, statement);
goto error;
}
rc = pysqlite_step(statement, self);
if (rc != SQLITE_DONE) {
_pysqlite_seterror(self->db, statement);
}
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_finalize(statement);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK && !PyErr_Occurred()) {
_pysqlite_seterror(self->db, NULL);
}
error:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_INCREF(Py_None);
return Py_None;
}
}
PyObject* pysqlite_connection_commit(pysqlite_Connection* self, PyObject* args)
{
int rc;
const char* tail;
sqlite3_stmt* statement;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!sqlite3_get_autocommit(self->db)) {
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_prepare(self->db, "COMMIT", -1, &statement, &tail);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db, NULL);
goto error;
}
rc = pysqlite_step(statement, self);
if (rc != SQLITE_DONE) {
_pysqlite_seterror(self->db, statement);
}
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_finalize(statement);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK && !PyErr_Occurred()) {
_pysqlite_seterror(self->db, NULL);
}
}
error:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_INCREF(Py_None);
return Py_None;
}
}
PyObject* pysqlite_connection_rollback(pysqlite_Connection* self, PyObject* args)
{
int rc;
const char* tail;
sqlite3_stmt* statement;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!sqlite3_get_autocommit(self->db)) {
pysqlite_do_all_statements(self, ACTION_RESET, 1);
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_prepare(self->db, "ROLLBACK", -1, &statement, &tail);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
_pysqlite_seterror(self->db, NULL);
goto error;
}
rc = pysqlite_step(statement, self);
if (rc != SQLITE_DONE) {
_pysqlite_seterror(self->db, statement);
}
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_finalize(statement);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK && !PyErr_Occurred()) {
_pysqlite_seterror(self->db, NULL);
}
}
error:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_INCREF(Py_None);
return Py_None;
}
}
static int
_pysqlite_set_result(sqlite3_context* context, PyObject* py_val)
{
if (py_val == Py_None) {
sqlite3_result_null(context);
} else if (PyLong_Check(py_val)) {
sqlite_int64 value = _pysqlite_long_as_int64(py_val);
if (value == -1 && PyErr_Occurred())
return -1;
sqlite3_result_int64(context, value);
} else if (PyFloat_Check(py_val)) {
sqlite3_result_double(context, PyFloat_AsDouble(py_val));
} else if (PyUnicode_Check(py_val)) {
const char *str = _PyUnicode_AsString(py_val);
if (str == NULL)
return -1;
sqlite3_result_text(context, str, -1, SQLITE_TRANSIENT);
} else if (PyObject_CheckBuffer(py_val)) {
Py_buffer view;
if (PyObject_GetBuffer(py_val, &view, PyBUF_SIMPLE) != 0) {
PyErr_SetString(PyExc_ValueError,
"could not convert BLOB to buffer");
return -1;
}
if (view.len > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"BLOB longer than INT_MAX bytes");
PyBuffer_Release(&view);
return -1;
}
sqlite3_result_blob(context, view.buf, (int)view.len, SQLITE_TRANSIENT);
PyBuffer_Release(&view);
} else {
return -1;
}
return 0;
}
PyObject* _pysqlite_build_py_params(sqlite3_context *context, int argc, sqlite3_value** argv)
{
PyObject* args;
int i;
sqlite3_value* cur_value;
PyObject* cur_py_value;
const char* val_str;
Py_ssize_t buflen;
args = PyTuple_New(argc);
if (!args) {
return NULL;
}
for (i = 0; i < argc; i++) {
cur_value = argv[i];
switch (sqlite3_value_type(argv[i])) {
case SQLITE_INTEGER:
cur_py_value = _pysqlite_long_from_int64(sqlite3_value_int64(cur_value));
break;
case SQLITE_FLOAT:
cur_py_value = PyFloat_FromDouble(sqlite3_value_double(cur_value));
break;
case SQLITE_TEXT:
val_str = (const char*)sqlite3_value_text(cur_value);
cur_py_value = PyUnicode_FromString(val_str);
/* TODO: have a way to show errors here */
if (!cur_py_value) {
PyErr_Clear();
Py_INCREF(Py_None);
cur_py_value = Py_None;
}
break;
case SQLITE_BLOB:
buflen = sqlite3_value_bytes(cur_value);
cur_py_value = PyBytes_FromStringAndSize(
sqlite3_value_blob(cur_value), buflen);
break;
case SQLITE_NULL:
default:
Py_INCREF(Py_None);
cur_py_value = Py_None;
}
if (!cur_py_value) {
Py_DECREF(args);
return NULL;
}
PyTuple_SetItem(args, i, cur_py_value);
}
return args;
}
void _pysqlite_func_callback(sqlite3_context* context, int argc, sqlite3_value** argv)
{
PyObject* args;
PyObject* py_func;
PyObject* py_retval = NULL;
int ok;
#ifdef WITH_THREAD
PyGILState_STATE threadstate;
threadstate = PyGILState_Ensure();
#endif
py_func = (PyObject*)sqlite3_user_data(context);
args = _pysqlite_build_py_params(context, argc, argv);
if (args) {
py_retval = PyObject_CallObject(py_func, args);
Py_DECREF(args);
}
ok = 0;
if (py_retval) {
ok = _pysqlite_set_result(context, py_retval) == 0;
Py_DECREF(py_retval);
}
if (!ok) {
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
_sqlite3_result_error(context, "user-defined function raised exception", -1);
}
#ifdef WITH_THREAD
PyGILState_Release(threadstate);
#endif
}
static void _pysqlite_step_callback(sqlite3_context *context, int argc, sqlite3_value** params)
{
PyObject* args;
PyObject* function_result = NULL;
PyObject* aggregate_class;
PyObject** aggregate_instance;
PyObject* stepmethod = NULL;
#ifdef WITH_THREAD
PyGILState_STATE threadstate;
threadstate = PyGILState_Ensure();
#endif
aggregate_class = (PyObject*)sqlite3_user_data(context);
aggregate_instance = (PyObject**)sqlite3_aggregate_context(context, sizeof(PyObject*));
if (*aggregate_instance == 0) {
*aggregate_instance = PyObject_CallFunction(aggregate_class, NULL);
if (PyErr_Occurred()) {
*aggregate_instance = 0;
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
_sqlite3_result_error(context, "user-defined aggregate's '__init__' method raised error", -1);
goto error;
}
}
stepmethod = PyObject_GetAttrString(*aggregate_instance, "step");
if (!stepmethod) {
goto error;
}
args = _pysqlite_build_py_params(context, argc, params);
if (!args) {
goto error;
}
function_result = PyObject_CallObject(stepmethod, args);
Py_DECREF(args);
if (!function_result) {
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
_sqlite3_result_error(context, "user-defined aggregate's 'step' method raised error", -1);
}
error:
Py_XDECREF(stepmethod);
Py_XDECREF(function_result);
#ifdef WITH_THREAD
PyGILState_Release(threadstate);
#endif
}
void _pysqlite_final_callback(sqlite3_context* context)
{
PyObject* function_result;
PyObject** aggregate_instance;
_Py_IDENTIFIER(finalize);
int ok;
PyObject *exception, *value, *tb;
int restore;
#ifdef WITH_THREAD
PyGILState_STATE threadstate;
threadstate = PyGILState_Ensure();
#endif
aggregate_instance = (PyObject**)sqlite3_aggregate_context(context, sizeof(PyObject*));
if (!*aggregate_instance) {
/* this branch is executed if there was an exception in the aggregate's
* __init__ */
goto error;
}
/* Keep the exception (if any) of the last call to step() */
PyErr_Fetch(&exception, &value, &tb);
restore = 1;
function_result = _PyObject_CallMethodId(*aggregate_instance, &PyId_finalize, NULL);
Py_DECREF(*aggregate_instance);
ok = 0;
if (function_result) {
ok = _pysqlite_set_result(context, function_result) == 0;
Py_DECREF(function_result);
}
if (!ok) {
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
_sqlite3_result_error(context, "user-defined aggregate's 'finalize' method raised error", -1);
#if SQLITE_VERSION_NUMBER < 3003003
/* with old SQLite versions, _sqlite3_result_error() sets a new Python
exception, so don't restore the previous exception */
restore = 0;
#endif
}
if (restore) {
/* Restore the exception (if any) of the last call to step(),
but clear also the current exception if finalize() failed */
PyErr_Restore(exception, value, tb);
}
error:
#ifdef WITH_THREAD
PyGILState_Release(threadstate);
#endif
/* explicit return to avoid a compilation error if WITH_THREAD
is not defined */
return;
}
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;
PyObject* weakref;
int i;
/* we only need to do this once in a while */
if (self->created_cursors++ < 200) {
return;
}
self->created_cursors = 0;
new_list = PyList_New(0);
if (!new_list) {
return;
}
for (i = 0; i < PyList_Size(self->cursors); i++) {
weakref = PyList_GetItem(self->cursors, i);
if (PyWeakref_GetObject(weakref) != Py_None) {
if (PyList_Append(new_list, weakref) != 0) {
Py_DECREF(new_list);
return;
}
}
}
Py_SETREF(self->cursors, new_list);
}
PyObject* pysqlite_connection_create_function(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
static char *kwlist[] = {"name", "narg", "func", NULL, NULL};
PyObject* func;
char* name;
int narg;
int rc;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "siO", kwlist,
&name, &narg, &func))
{
return NULL;
}
rc = sqlite3_create_function(self->db, name, narg, SQLITE_UTF8, (void*)func, _pysqlite_func_callback, NULL, NULL);
if (rc != SQLITE_OK) {
/* Workaround for SQLite bug: no error code or string is available here */
PyErr_SetString(pysqlite_OperationalError, "Error creating function");
return NULL;
} else {
if (PyDict_SetItem(self->function_pinboard, func, Py_None) == -1)
return NULL;
Py_RETURN_NONE;
}
}
PyObject* pysqlite_connection_create_aggregate(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
PyObject* aggregate_class;
int n_arg;
char* name;
static char *kwlist[] = { "name", "n_arg", "aggregate_class", NULL };
int rc;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "siO:create_aggregate",
kwlist, &name, &n_arg, &aggregate_class)) {
return NULL;
}
rc = sqlite3_create_function(self->db, name, n_arg, SQLITE_UTF8, (void*)aggregate_class, 0, &_pysqlite_step_callback, &_pysqlite_final_callback);
if (rc != SQLITE_OK) {
/* Workaround for SQLite bug: no error code or string is available here */
PyErr_SetString(pysqlite_OperationalError, "Error creating aggregate");
return NULL;
} else {
if (PyDict_SetItem(self->function_pinboard, aggregate_class, Py_None) == -1)
return NULL;
Py_RETURN_NONE;
}
}
static int _authorizer_callback(void* user_arg, int action, const char* arg1, const char* arg2 , const char* dbname, const char* access_attempt_source)
{
PyObject *ret;
int rc;
#ifdef WITH_THREAD
PyGILState_STATE gilstate;
gilstate = PyGILState_Ensure();
#endif
ret = PyObject_CallFunction((PyObject*)user_arg, "issss", action, arg1, arg2, dbname, access_attempt_source);
if (ret == NULL) {
if (_enable_callback_tracebacks)
PyErr_Print();
else
PyErr_Clear();
rc = SQLITE_DENY;
}
else {
if (PyLong_Check(ret)) {
rc = _PyLong_AsInt(ret);
if (rc == -1 && PyErr_Occurred()) {
if (_enable_callback_tracebacks)
PyErr_Print();
else
PyErr_Clear();
rc = SQLITE_DENY;
}
}
else {
rc = SQLITE_DENY;
}
Py_DECREF(ret);
}
#ifdef WITH_THREAD
PyGILState_Release(gilstate);
#endif
return rc;
}
static int _progress_handler(void* user_arg)
{
int rc;
PyObject *ret;
#ifdef WITH_THREAD
PyGILState_STATE gilstate;
gilstate = PyGILState_Ensure();
#endif
ret = PyObject_CallFunction((PyObject*)user_arg, NULL);
if (!ret) {
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
/* abort query if error occurred */
rc = 1;
} else {
rc = (int)PyObject_IsTrue(ret);
Py_DECREF(ret);
}
#ifdef WITH_THREAD
PyGILState_Release(gilstate);
#endif
return rc;
}
static void _trace_callback(void* user_arg, const char* statement_string)
{
PyObject *py_statement = NULL;
PyObject *ret = NULL;
#ifdef WITH_THREAD
PyGILState_STATE gilstate;
gilstate = PyGILState_Ensure();
#endif
py_statement = PyUnicode_DecodeUTF8(statement_string,
strlen(statement_string), "replace");
if (py_statement) {
ret = PyObject_CallFunctionObjArgs((PyObject*)user_arg, py_statement, NULL);
Py_DECREF(py_statement);
}
if (ret) {
Py_DECREF(ret);
} else {
if (_enable_callback_tracebacks) {
PyErr_Print();
} else {
PyErr_Clear();
}
}
#ifdef WITH_THREAD
PyGILState_Release(gilstate);
#endif
}
static PyObject* pysqlite_connection_set_authorizer(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
PyObject* authorizer_cb;
static char *kwlist[] = { "authorizer_callback", NULL };
int rc;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O:set_authorizer",
kwlist, &authorizer_cb)) {
return NULL;
}
rc = sqlite3_set_authorizer(self->db, _authorizer_callback, (void*)authorizer_cb);
if (rc != SQLITE_OK) {
PyErr_SetString(pysqlite_OperationalError, "Error setting authorizer callback");
return NULL;
} else {
if (PyDict_SetItem(self->function_pinboard, authorizer_cb, Py_None) == -1)
return NULL;
Py_RETURN_NONE;
}
}
static PyObject* pysqlite_connection_set_progress_handler(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
PyObject* progress_handler;
int n;
static char *kwlist[] = { "progress_handler", "n", NULL };
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "Oi:set_progress_handler",
kwlist, &progress_handler, &n)) {
return NULL;
}
if (progress_handler == Py_None) {
/* None clears the progress handler previously set */
sqlite3_progress_handler(self->db, 0, 0, (void*)0);
} else {
sqlite3_progress_handler(self->db, n, _progress_handler, progress_handler);
if (PyDict_SetItem(self->function_pinboard, progress_handler, Py_None) == -1)
return NULL;
}
Py_RETURN_NONE;
}
static PyObject* pysqlite_connection_set_trace_callback(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
PyObject* trace_callback;
static char *kwlist[] = { "trace_callback", NULL };
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O:set_trace_callback",
kwlist, &trace_callback)) {
return NULL;
}
if (trace_callback == Py_None) {
/* None clears the trace callback previously set */
sqlite3_trace(self->db, 0, (void*)0);
} else {
if (PyDict_SetItem(self->function_pinboard, trace_callback, Py_None) == -1)
return NULL;
sqlite3_trace(self->db, _trace_callback, trace_callback);
}
Py_RETURN_NONE;
}
#ifdef HAVE_LOAD_EXTENSION
static PyObject* pysqlite_enable_load_extension(pysqlite_Connection* self, PyObject* args)
{
int rc;
int onoff;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTuple(args, "i", &onoff)) {
return NULL;
}
rc = sqlite3_enable_load_extension(self->db, onoff);
if (rc != SQLITE_OK) {
PyErr_SetString(pysqlite_OperationalError, "Error enabling load extension");
return NULL;
} else {
Py_RETURN_NONE;
}
}
static PyObject* pysqlite_load_extension(pysqlite_Connection* self, PyObject* args)
{
int rc;
char* extension_name;
char* errmsg;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!PyArg_ParseTuple(args, "s", &extension_name)) {
return NULL;
}
rc = sqlite3_load_extension(self->db, extension_name, 0, &errmsg);
if (rc != 0) {
PyErr_SetString(pysqlite_OperationalError, errmsg);
return NULL;
} else {
Py_RETURN_NONE;
}
}
#endif
int pysqlite_check_thread(pysqlite_Connection* self)
{
#ifdef WITH_THREAD
if (self->check_same_thread) {
if (PyThread_get_thread_ident() != self->thread_ident) {
PyErr_Format(pysqlite_ProgrammingError,
"SQLite objects created in a thread can only be used in that same thread."
"The object was created in thread id %ld and this is thread id %ld",
self->thread_ident, PyThread_get_thread_ident());
return 0;
}
}
#endif
return 1;
}
static PyObject* pysqlite_connection_get_isolation_level(pysqlite_Connection* self, void* unused)
{
Py_INCREF(self->isolation_level);
return self->isolation_level;
}
static PyObject* pysqlite_connection_get_total_changes(pysqlite_Connection* self, void* unused)
{
if (!pysqlite_check_connection(self)) {
return NULL;
} else {
return Py_BuildValue("i", sqlite3_total_changes(self->db));
}
}
static PyObject* pysqlite_connection_get_in_transaction(pysqlite_Connection* self, void* unused)
{
if (!pysqlite_check_connection(self)) {
return NULL;
}
if (!sqlite3_get_autocommit(self->db)) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
static int pysqlite_connection_set_isolation_level(pysqlite_Connection* self, PyObject* isolation_level)
{
if (isolation_level == Py_None) {
PyObject *res = pysqlite_connection_commit(self, NULL);
if (!res) {
return -1;
}
Py_DECREF(res);
self->begin_statement = NULL;
} else {
const char * const *candidate;
PyObject *uppercase_level;
_Py_IDENTIFIER(upper);
if (!PyUnicode_Check(isolation_level)) {
PyErr_Format(PyExc_TypeError,
"isolation_level must be a string or None, not %.100s",
Py_TYPE(isolation_level)->tp_name);
return -1;
}
uppercase_level = _PyObject_CallMethodIdObjArgs(
(PyObject *)&PyUnicode_Type, &PyId_upper,
isolation_level, NULL);
if (!uppercase_level) {
return -1;
}
for (candidate = begin_statements; *candidate; candidate++) {
if (!PyUnicode_CompareWithASCIIString(uppercase_level, *candidate + 6))
break;
}
Py_DECREF(uppercase_level);
if (!*candidate) {
PyErr_SetString(PyExc_ValueError,
"invalid value for isolation_level");
return -1;
}
self->begin_statement = *candidate;
}
Py_INCREF(isolation_level);
Py_XSETREF(self->isolation_level, isolation_level);
return 0;
}
PyObject* pysqlite_connection_call(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
{
PyObject* sql;
pysqlite_Statement* statement;
PyObject* weakref;
int rc;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (!_PyArg_NoKeywords(MODULE_NAME ".Connection()", kwargs))
return NULL;
if (!PyArg_ParseTuple(args, "O", &sql))
return NULL;
_pysqlite_drop_unused_statement_references(self);
statement = PyObject_New(pysqlite_Statement, &pysqlite_StatementType);
if (!statement) {
return NULL;
}
statement->db = NULL;
statement->st = NULL;
statement->sql = NULL;
statement->in_use = 0;
statement->in_weakreflist = NULL;
rc = pysqlite_statement_create(statement, self, sql);
if (rc != SQLITE_OK) {
if (rc == PYSQLITE_TOO_MUCH_SQL) {
PyErr_SetString(pysqlite_Warning, "You can only execute one statement at a time.");
} else if (rc == PYSQLITE_SQL_WRONG_TYPE) {
if (PyErr_ExceptionMatches(PyExc_TypeError))
PyErr_SetString(pysqlite_Warning, "SQL is of wrong type. Must be string.");
} else {
(void)pysqlite_statement_reset(statement);
_pysqlite_seterror(self->db, NULL);
}
goto error;
}
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;
}
PyObject* pysqlite_connection_execute(pysqlite_Connection* self, PyObject* args)
{
PyObject* cursor = 0;
PyObject* result = 0;
PyObject* method = 0;
cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
if (!cursor) {
goto error;
}
method = PyObject_GetAttrString(cursor, "execute");
if (!method) {
Py_CLEAR(cursor);
goto error;
}
result = PyObject_CallObject(method, args);
if (!result) {
Py_CLEAR(cursor);
}
error:
Py_XDECREF(result);
Py_XDECREF(method);
return cursor;
}
PyObject* pysqlite_connection_executemany(pysqlite_Connection* self, PyObject* args)
{
PyObject* cursor = 0;
PyObject* result = 0;
PyObject* method = 0;
cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
if (!cursor) {
goto error;
}
method = PyObject_GetAttrString(cursor, "executemany");
if (!method) {
Py_CLEAR(cursor);
goto error;
}
result = PyObject_CallObject(method, args);
if (!result) {
Py_CLEAR(cursor);
}
error:
Py_XDECREF(result);
Py_XDECREF(method);
return cursor;
}
PyObject* pysqlite_connection_executescript(pysqlite_Connection* self, PyObject* args)
{
PyObject* cursor = 0;
PyObject* result = 0;
PyObject* method = 0;
cursor = _PyObject_CallMethodId((PyObject*)self, &PyId_cursor, NULL);
if (!cursor) {
goto error;
}
method = PyObject_GetAttrString(cursor, "executescript");
if (!method) {
Py_CLEAR(cursor);
goto error;
}
result = PyObject_CallObject(method, args);
if (!result) {
Py_CLEAR(cursor);
}
error:
Py_XDECREF(result);
Py_XDECREF(method);
return cursor;
}
/* ------------------------- COLLATION CODE ------------------------ */
static int
pysqlite_collation_callback(
void* context,
int text1_length, const void* text1_data,
int text2_length, const void* text2_data)
{
PyObject* callback = (PyObject*)context;
PyObject* string1 = 0;
PyObject* string2 = 0;
#ifdef WITH_THREAD
PyGILState_STATE gilstate;
#endif
PyObject* retval = NULL;
long longval;
int result = 0;
#ifdef WITH_THREAD
gilstate = PyGILState_Ensure();
#endif
if (PyErr_Occurred()) {
goto finally;
}
string1 = PyUnicode_FromStringAndSize((const char*)text1_data, text1_length);
string2 = PyUnicode_FromStringAndSize((const char*)text2_data, text2_length);
if (!string1 || !string2) {
goto finally; /* failed to allocate strings */
}
retval = PyObject_CallFunctionObjArgs(callback, string1, string2, NULL);
if (!retval) {
/* execution failed */
goto finally;
}
longval = PyLong_AsLongAndOverflow(retval, &result);
if (longval == -1 && PyErr_Occurred()) {
PyErr_Clear();
result = 0;
}
else if (!result) {
if (longval > 0)
result = 1;
else if (longval < 0)
result = -1;
}
finally:
Py_XDECREF(string1);
Py_XDECREF(string2);
Py_XDECREF(retval);
#ifdef WITH_THREAD
PyGILState_Release(gilstate);
#endif
return result;
}
static PyObject *
pysqlite_connection_interrupt(pysqlite_Connection* self, PyObject* args)
{
PyObject* retval = NULL;
if (!pysqlite_check_connection(self)) {
goto finally;
}
sqlite3_interrupt(self->db);
Py_INCREF(Py_None);
retval = Py_None;
finally:
return retval;
}
/* Function author: Paul Kippes <kippesp@gmail.com>
* Class method of Connection to call the Python function _iterdump
* of the sqlite3 module.
*/
static PyObject *
pysqlite_connection_iterdump(pysqlite_Connection* self, PyObject* args)
{
PyObject* retval = NULL;
PyObject* module = NULL;
PyObject* module_dict;
PyObject* pyfn_iterdump;
if (!pysqlite_check_connection(self)) {
goto finally;
}
module = PyImport_ImportModule(MODULE_NAME ".dump");
if (!module) {
goto finally;
}
module_dict = PyModule_GetDict(module);
if (!module_dict) {
goto finally;
}
pyfn_iterdump = PyDict_GetItemString(module_dict, "_iterdump");
if (!pyfn_iterdump) {
PyErr_SetString(pysqlite_OperationalError, "Failed to obtain _iterdump() reference");
goto finally;
}
args = PyTuple_New(1);
if (!args) {
goto finally;
}
Py_INCREF(self);
PyTuple_SetItem(args, 0, (PyObject*)self);
retval = PyObject_CallObject(pyfn_iterdump, args);
finally:
Py_XDECREF(args);
Py_XDECREF(module);
return retval;
}
static PyObject *
pysqlite_connection_create_collation(pysqlite_Connection* self, PyObject* args)
{
PyObject* callable;
PyObject* uppercase_name = 0;
PyObject* name;
PyObject* retval;
Py_ssize_t i, len;
_Py_IDENTIFIER(upper);
char *uppercase_name_str;
int rc;
unsigned int kind;
void *data;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
goto finally;
}
if (!PyArg_ParseTuple(args, "O!O:create_collation(name, callback)", &PyUnicode_Type, &name, &callable)) {
goto finally;
}
uppercase_name = _PyObject_CallMethodId(name, &PyId_upper, NULL);
if (!uppercase_name) {
goto finally;
}
if (PyUnicode_READY(uppercase_name))
goto finally;
len = PyUnicode_GET_LENGTH(uppercase_name);
kind = PyUnicode_KIND(uppercase_name);
data = PyUnicode_DATA(uppercase_name);
for (i=0; i<len; i++) {
Py_UCS4 ch = PyUnicode_READ(kind, data, i);
if ((ch >= '0' && ch <= '9')
|| (ch >= 'A' && ch <= 'Z')
|| (ch == '_'))
{
continue;
} else {
PyErr_SetString(pysqlite_ProgrammingError, "invalid character in collation name");
goto finally;
}
}
uppercase_name_str = _PyUnicode_AsString(uppercase_name);
if (!uppercase_name_str)
goto finally;
if (callable != Py_None && !PyCallable_Check(callable)) {
PyErr_SetString(PyExc_TypeError, "parameter must be callable");
goto finally;
}
if (callable != Py_None) {
if (PyDict_SetItem(self->collations, uppercase_name, callable) == -1)
goto finally;
} else {
if (PyDict_DelItem(self->collations, uppercase_name) == -1)
goto finally;
}
rc = sqlite3_create_collation(self->db,
uppercase_name_str,
SQLITE_UTF8,
(callable != Py_None) ? callable : NULL,
(callable != Py_None) ? pysqlite_collation_callback : NULL);
if (rc != SQLITE_OK) {
PyDict_DelItem(self->collations, uppercase_name);
_pysqlite_seterror(self->db, NULL);
goto finally;
}
finally:
Py_XDECREF(uppercase_name);
if (PyErr_Occurred()) {
retval = NULL;
} else {
Py_INCREF(Py_None);
retval = Py_None;
}
return retval;
}
/* Called when the connection is used as a context manager. Returns itself as a
* convenience to the caller. */
static PyObject *
pysqlite_connection_enter(pysqlite_Connection* self, PyObject* args)
{
Py_INCREF(self);
return (PyObject*)self;
}
/** Called when the connection is used as a context manager. If there was any
* exception, a rollback takes place; otherwise we commit. */
static PyObject *
pysqlite_connection_exit(pysqlite_Connection* self, PyObject* args)
{
PyObject* exc_type, *exc_value, *exc_tb;
char* method_name;
PyObject* result;
if (!PyArg_ParseTuple(args, "OOO", &exc_type, &exc_value, &exc_tb)) {
return NULL;
}
if (exc_type == Py_None && exc_value == Py_None && exc_tb == Py_None) {
method_name = "commit";
} else {
method_name = "rollback";
}
result = PyObject_CallMethod((PyObject*)self, method_name, NULL);
if (!result) {
return NULL;
}
Py_DECREF(result);
Py_RETURN_FALSE;
}
static const char connection_doc[] =
PyDoc_STR("SQLite database connection object.");
static PyGetSetDef connection_getset[] = {
{"isolation_level", (getter)pysqlite_connection_get_isolation_level, (setter)pysqlite_connection_set_isolation_level},
{"total_changes", (getter)pysqlite_connection_get_total_changes, (setter)0},
{"in_transaction", (getter)pysqlite_connection_get_in_transaction, (setter)0},
{NULL}
};
static PyMethodDef connection_methods[] = {
{"cursor", (PyCFunction)pysqlite_connection_cursor, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Return a cursor for the connection.")},
{"close", (PyCFunction)pysqlite_connection_close, METH_NOARGS,
PyDoc_STR("Closes the connection.")},
{"commit", (PyCFunction)pysqlite_connection_commit, METH_NOARGS,
PyDoc_STR("Commit the current transaction.")},
{"rollback", (PyCFunction)pysqlite_connection_rollback, METH_NOARGS,
PyDoc_STR("Roll back the current transaction.")},
{"create_function", (PyCFunction)pysqlite_connection_create_function, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Creates a new function. Non-standard.")},
{"create_aggregate", (PyCFunction)pysqlite_connection_create_aggregate, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Creates a new aggregate. Non-standard.")},
{"set_authorizer", (PyCFunction)pysqlite_connection_set_authorizer, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Sets authorizer callback. Non-standard.")},
#ifdef HAVE_LOAD_EXTENSION
{"enable_load_extension", (PyCFunction)pysqlite_enable_load_extension, METH_VARARGS,
PyDoc_STR("Enable dynamic loading of SQLite extension modules. Non-standard.")},
{"load_extension", (PyCFunction)pysqlite_load_extension, METH_VARARGS,
PyDoc_STR("Load SQLite extension module. Non-standard.")},
#endif
{"set_progress_handler", (PyCFunction)pysqlite_connection_set_progress_handler, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Sets progress handler callback. Non-standard.")},
{"set_trace_callback", (PyCFunction)pysqlite_connection_set_trace_callback, METH_VARARGS|METH_KEYWORDS,
PyDoc_STR("Sets a trace callback called for each SQL statement (passed as unicode). Non-standard.")},
{"execute", (PyCFunction)pysqlite_connection_execute, METH_VARARGS,
PyDoc_STR("Executes a SQL statement. Non-standard.")},
{"executemany", (PyCFunction)pysqlite_connection_executemany, METH_VARARGS,
PyDoc_STR("Repeatedly executes a SQL statement. Non-standard.")},
{"executescript", (PyCFunction)pysqlite_connection_executescript, METH_VARARGS,
PyDoc_STR("Executes a multiple SQL statements at once. Non-standard.")},
{"create_collation", (PyCFunction)pysqlite_connection_create_collation, METH_VARARGS,
PyDoc_STR("Creates a collation function. Non-standard.")},
{"interrupt", (PyCFunction)pysqlite_connection_interrupt, METH_NOARGS,
PyDoc_STR("Abort any pending database operation. Non-standard.")},
{"iterdump", (PyCFunction)pysqlite_connection_iterdump, METH_NOARGS,
PyDoc_STR("Returns iterator to the dump of the database in an SQL text format. Non-standard.")},
{"__enter__", (PyCFunction)pysqlite_connection_enter, METH_NOARGS,
PyDoc_STR("For context manager. Non-standard.")},
{"__exit__", (PyCFunction)pysqlite_connection_exit, METH_VARARGS,
PyDoc_STR("For context manager. Non-standard.")},
{NULL, NULL}
};
static struct PyMemberDef connection_members[] =
{
{"Warning", T_OBJECT, offsetof(pysqlite_Connection, Warning), READONLY},
{"Error", T_OBJECT, offsetof(pysqlite_Connection, Error), READONLY},
{"InterfaceError", T_OBJECT, offsetof(pysqlite_Connection, InterfaceError), READONLY},
{"DatabaseError", T_OBJECT, offsetof(pysqlite_Connection, DatabaseError), READONLY},
{"DataError", T_OBJECT, offsetof(pysqlite_Connection, DataError), READONLY},
{"OperationalError", T_OBJECT, offsetof(pysqlite_Connection, OperationalError), READONLY},
{"IntegrityError", T_OBJECT, offsetof(pysqlite_Connection, IntegrityError), READONLY},
{"InternalError", T_OBJECT, offsetof(pysqlite_Connection, InternalError), READONLY},
{"ProgrammingError", T_OBJECT, offsetof(pysqlite_Connection, ProgrammingError), READONLY},
{"NotSupportedError", T_OBJECT, offsetof(pysqlite_Connection, NotSupportedError), READONLY},
{"row_factory", T_OBJECT, offsetof(pysqlite_Connection, row_factory)},
{"text_factory", T_OBJECT, offsetof(pysqlite_Connection, text_factory)},
{NULL}
};
PyTypeObject pysqlite_ConnectionType = {
PyVarObject_HEAD_INIT(NULL, 0)
MODULE_NAME ".Connection", /* tp_name */
sizeof(pysqlite_Connection), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)pysqlite_connection_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)pysqlite_connection_call, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
connection_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
connection_methods, /* tp_methods */
connection_members, /* tp_members */
connection_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)pysqlite_connection_init, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0 /* tp_free */
};
extern int pysqlite_connection_setup_types(void)
{
pysqlite_ConnectionType.tp_new = PyType_GenericNew;
return PyType_Ready(&pysqlite_ConnectionType);
}
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