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cpython/Modules/_sqlite/module.c

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/* module.c - the module itself
*
* Copyright (C) 2004-2007 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 "connection.h"
#include "statement.h"
#include "cursor.h"
#include "cache.h"
#include "prepare_protocol.h"
#include "microprotocols.h"
#include "row.h"
#if SQLITE_VERSION_NUMBER >= 3003003
#define HAVE_SHARED_CACHE
#endif
/* static objects at module-level */
PyObject* pysqlite_Error, *pysqlite_Warning, *pysqlite_InterfaceError, *pysqlite_DatabaseError,
*pysqlite_InternalError, *pysqlite_OperationalError, *pysqlite_ProgrammingError,
*pysqlite_IntegrityError, *pysqlite_DataError, *pysqlite_NotSupportedError, *pysqlite_OptimizedUnicode;
PyObject* converters;
int _enable_callback_tracebacks;
int pysqlite_BaseTypeAdapted;
static PyObject* module_connect(PyObject* self, PyObject* args, PyObject*
kwargs)
{
/* Python seems to have no way of extracting a single keyword-arg at
* C-level, so this code is redundant with the one in connection_init in
* connection.c and must always be copied from there ... */
static char *kwlist[] = {"database", "timeout", "detect_types", "isolation_level", "check_same_thread", "factory", "cached_statements", NULL, NULL};
PyObject* database;
int detect_types = 0;
PyObject* isolation_level;
PyObject* factory = NULL;
int check_same_thread = 1;
int cached_statements;
double timeout = 5.0;
PyObject* result;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|diOiOi", kwlist,
&database, &timeout, &detect_types, &isolation_level, &check_same_thread, &factory, &cached_statements))
{
return NULL;
}
if (factory == NULL) {
factory = (PyObject*)&pysqlite_ConnectionType;
}
result = PyObject_Call(factory, args, kwargs);
return result;
}
PyDoc_STRVAR(module_connect_doc,
"connect(database[, timeout, isolation_level, detect_types, factory])\n\
\n\
Opens a connection to the SQLite database file *database*. You can use\n\
\":memory:\" to open a database connection to a database that resides in\n\
RAM instead of on disk.");
static PyObject* module_complete(PyObject* self, PyObject* args, PyObject*
kwargs)
{
static char *kwlist[] = {"statement", NULL, NULL};
char* statement;
PyObject* result;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s", kwlist, &statement))
{
return NULL;
}
if (sqlite3_complete(statement)) {
result = Py_True;
} else {
result = Py_False;
}
Py_INCREF(result);
return result;
}
PyDoc_STRVAR(module_complete_doc,
"complete_statement(sql)\n\
\n\
Checks if a string contains a complete SQL statement. Non-standard.");
#ifdef HAVE_SHARED_CACHE
static PyObject* module_enable_shared_cache(PyObject* self, PyObject* args, PyObject*
kwargs)
{
static char *kwlist[] = {"do_enable", NULL, NULL};
int do_enable;
int rc;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i", kwlist, &do_enable))
{
return NULL;
}
rc = sqlite3_enable_shared_cache(do_enable);
if (rc != SQLITE_OK) {
PyErr_SetString(pysqlite_OperationalError, "Changing the shared_cache flag failed");
return NULL;
} else {
Py_INCREF(Py_None);
return Py_None;
}
}
PyDoc_STRVAR(module_enable_shared_cache_doc,
"enable_shared_cache(do_enable)\n\
\n\
Enable or disable shared cache mode for the calling thread.\n\
Experimental/Non-standard.");
#endif /* HAVE_SHARED_CACHE */
static PyObject* module_register_adapter(PyObject* self, PyObject* args)
{
PyTypeObject* type;
PyObject* caster;
int rc;
if (!PyArg_ParseTuple(args, "OO", &type, &caster)) {
return NULL;
}
/* a basic type is adapted; there's a performance optimization if that's not the case
* (99 % of all usages) */
if (type == &PyInt_Type || type == &PyLong_Type || type == &PyFloat_Type
|| type == &PyString_Type || type == &PyUnicode_Type || type == &PyBuffer_Type) {
pysqlite_BaseTypeAdapted = 1;
}
rc = pysqlite_microprotocols_add(type, (PyObject*)&pysqlite_PrepareProtocolType, caster);
if (rc == -1)
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(module_register_adapter_doc,
"register_adapter(type, callable)\n\
\n\
Registers an adapter with pysqlite's adapter registry. Non-standard.");
static PyObject* module_register_converter(PyObject* self, PyObject* args)
{
PyObject* orig_name;
PyObject* name = NULL;
PyObject* callable;
PyObject* retval = NULL;
if (!PyArg_ParseTuple(args, "SO", &orig_name, &callable)) {
return NULL;
}
/* convert the name to upper case */
name = PyObject_CallMethod(orig_name, "upper", "");
if (!name) {
goto error;
}
if (PyDict_SetItem(converters, name, callable) != 0) {
goto error;
}
Py_INCREF(Py_None);
retval = Py_None;
error:
Py_XDECREF(name);
return retval;
}
PyDoc_STRVAR(module_register_converter_doc,
"register_converter(typename, callable)\n\
\n\
Registers a converter with pysqlite. Non-standard.");
static PyObject* enable_callback_tracebacks(PyObject* self, PyObject* args)
{
if (!PyArg_ParseTuple(args, "i", &_enable_callback_tracebacks)) {
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(enable_callback_tracebacks_doc,
"enable_callback_tracebacks(flag)\n\
\n\
Enable or disable callback functions throwing errors to stderr.");
static void converters_init(PyObject* dict)
{
converters = PyDict_New();
if (!converters) {
return;
}
PyDict_SetItemString(dict, "converters", converters);
}
static PyMethodDef module_methods[] = {
{"connect", (PyCFunction)module_connect,
METH_VARARGS | METH_KEYWORDS, module_connect_doc},
{"complete_statement", (PyCFunction)module_complete,
METH_VARARGS | METH_KEYWORDS, module_complete_doc},
#ifdef HAVE_SHARED_CACHE
{"enable_shared_cache", (PyCFunction)module_enable_shared_cache,
METH_VARARGS | METH_KEYWORDS, module_enable_shared_cache_doc},
#endif
{"register_adapter", (PyCFunction)module_register_adapter,
METH_VARARGS, module_register_adapter_doc},
{"register_converter", (PyCFunction)module_register_converter,
METH_VARARGS, module_register_converter_doc},
{"adapt", (PyCFunction)pysqlite_adapt, METH_VARARGS,
pysqlite_adapt_doc},
{"enable_callback_tracebacks", (PyCFunction)enable_callback_tracebacks,
METH_VARARGS, enable_callback_tracebacks_doc},
{NULL, NULL}
};
struct _IntConstantPair {
char* constant_name;
int constant_value;
};
typedef struct _IntConstantPair IntConstantPair;
static IntConstantPair _int_constants[] = {
{"PARSE_DECLTYPES", PARSE_DECLTYPES},
{"PARSE_COLNAMES", PARSE_COLNAMES},
{"SQLITE_OK", SQLITE_OK},
{"SQLITE_DENY", SQLITE_DENY},
{"SQLITE_IGNORE", SQLITE_IGNORE},
{"SQLITE_CREATE_INDEX", SQLITE_CREATE_INDEX},
{"SQLITE_CREATE_TABLE", SQLITE_CREATE_TABLE},
{"SQLITE_CREATE_TEMP_INDEX", SQLITE_CREATE_TEMP_INDEX},
{"SQLITE_CREATE_TEMP_TABLE", SQLITE_CREATE_TEMP_TABLE},
{"SQLITE_CREATE_TEMP_TRIGGER", SQLITE_CREATE_TEMP_TRIGGER},
{"SQLITE_CREATE_TEMP_VIEW", SQLITE_CREATE_TEMP_VIEW},
{"SQLITE_CREATE_TRIGGER", SQLITE_CREATE_TRIGGER},
{"SQLITE_CREATE_VIEW", SQLITE_CREATE_VIEW},
{"SQLITE_DELETE", SQLITE_DELETE},
{"SQLITE_DROP_INDEX", SQLITE_DROP_INDEX},
{"SQLITE_DROP_TABLE", SQLITE_DROP_TABLE},
{"SQLITE_DROP_TEMP_INDEX", SQLITE_DROP_TEMP_INDEX},
{"SQLITE_DROP_TEMP_TABLE", SQLITE_DROP_TEMP_TABLE},
{"SQLITE_DROP_TEMP_TRIGGER", SQLITE_DROP_TEMP_TRIGGER},
{"SQLITE_DROP_TEMP_VIEW", SQLITE_DROP_TEMP_VIEW},
{"SQLITE_DROP_TRIGGER", SQLITE_DROP_TRIGGER},
{"SQLITE_DROP_VIEW", SQLITE_DROP_VIEW},
{"SQLITE_INSERT", SQLITE_INSERT},
{"SQLITE_PRAGMA", SQLITE_PRAGMA},
{"SQLITE_READ", SQLITE_READ},
{"SQLITE_SELECT", SQLITE_SELECT},
{"SQLITE_TRANSACTION", SQLITE_TRANSACTION},
{"SQLITE_UPDATE", SQLITE_UPDATE},
{"SQLITE_ATTACH", SQLITE_ATTACH},
{"SQLITE_DETACH", SQLITE_DETACH},
#if SQLITE_VERSION_NUMBER >= 3002001
{"SQLITE_ALTER_TABLE", SQLITE_ALTER_TABLE},
{"SQLITE_REINDEX", SQLITE_REINDEX},
#endif
#if SQLITE_VERSION_NUMBER >= 3003000
{"SQLITE_ANALYZE", SQLITE_ANALYZE},
#endif
{(char*)NULL, 0}
};
PyMODINIT_FUNC init_sqlite3(void)
{
PyObject *module, *dict;
PyObject *tmp_obj;
int i;
module = Py_InitModule("_sqlite3", module_methods);
if (!module ||
(pysqlite_row_setup_types() < 0) ||
(pysqlite_cursor_setup_types() < 0) ||
(pysqlite_connection_setup_types() < 0) ||
(pysqlite_cache_setup_types() < 0) ||
(pysqlite_statement_setup_types() < 0) ||
(pysqlite_prepare_protocol_setup_types() < 0)
) {
return;
}
Py_INCREF(&pysqlite_ConnectionType);
PyModule_AddObject(module, "Connection", (PyObject*) &pysqlite_ConnectionType);
Py_INCREF(&pysqlite_CursorType);
PyModule_AddObject(module, "Cursor", (PyObject*) &pysqlite_CursorType);
Py_INCREF(&pysqlite_CacheType);
PyModule_AddObject(module, "Statement", (PyObject*)&pysqlite_StatementType);
Py_INCREF(&pysqlite_StatementType);
PyModule_AddObject(module, "Cache", (PyObject*) &pysqlite_CacheType);
Py_INCREF(&pysqlite_PrepareProtocolType);
PyModule_AddObject(module, "PrepareProtocol", (PyObject*) &pysqlite_PrepareProtocolType);
Py_INCREF(&pysqlite_RowType);
PyModule_AddObject(module, "Row", (PyObject*) &pysqlite_RowType);
if (!(dict = PyModule_GetDict(module))) {
goto error;
}
/*** Create DB-API Exception hierarchy */
if (!(pysqlite_Error = PyErr_NewException(MODULE_NAME ".Error", PyExc_StandardError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "Error", pysqlite_Error);
if (!(pysqlite_Warning = PyErr_NewException(MODULE_NAME ".Warning", PyExc_StandardError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "Warning", pysqlite_Warning);
/* Error subclasses */
if (!(pysqlite_InterfaceError = PyErr_NewException(MODULE_NAME ".InterfaceError", pysqlite_Error, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "InterfaceError", pysqlite_InterfaceError);
if (!(pysqlite_DatabaseError = PyErr_NewException(MODULE_NAME ".DatabaseError", pysqlite_Error, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "DatabaseError", pysqlite_DatabaseError);
/* pysqlite_DatabaseError subclasses */
if (!(pysqlite_InternalError = PyErr_NewException(MODULE_NAME ".InternalError", pysqlite_DatabaseError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "InternalError", pysqlite_InternalError);
if (!(pysqlite_OperationalError = PyErr_NewException(MODULE_NAME ".OperationalError", pysqlite_DatabaseError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "OperationalError", pysqlite_OperationalError);
if (!(pysqlite_ProgrammingError = PyErr_NewException(MODULE_NAME ".ProgrammingError", pysqlite_DatabaseError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "ProgrammingError", pysqlite_ProgrammingError);
if (!(pysqlite_IntegrityError = PyErr_NewException(MODULE_NAME ".IntegrityError", pysqlite_DatabaseError,NULL))) {
goto error;
}
PyDict_SetItemString(dict, "IntegrityError", pysqlite_IntegrityError);
if (!(pysqlite_DataError = PyErr_NewException(MODULE_NAME ".DataError", pysqlite_DatabaseError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "DataError", pysqlite_DataError);
if (!(pysqlite_NotSupportedError = PyErr_NewException(MODULE_NAME ".NotSupportedError", pysqlite_DatabaseError, NULL))) {
goto error;
}
PyDict_SetItemString(dict, "NotSupportedError", pysqlite_NotSupportedError);
/* We just need "something" unique for pysqlite_OptimizedUnicode. It does not really
* need to be a string subclass. Just anything that can act as a special
* marker for us. So I pulled PyCell_Type out of my magic hat.
*/
Py_INCREF((PyObject*)&PyCell_Type);
pysqlite_OptimizedUnicode = (PyObject*)&PyCell_Type;
PyDict_SetItemString(dict, "OptimizedUnicode", pysqlite_OptimizedUnicode);
/* Set integer constants */
for (i = 0; _int_constants[i].constant_name != 0; i++) {
tmp_obj = PyInt_FromLong(_int_constants[i].constant_value);
if (!tmp_obj) {
goto error;
}
PyDict_SetItemString(dict, _int_constants[i].constant_name, tmp_obj);
Py_DECREF(tmp_obj);
}
if (!(tmp_obj = PyString_FromString(PYSQLITE_VERSION))) {
goto error;
}
PyDict_SetItemString(dict, "version", tmp_obj);
Py_DECREF(tmp_obj);
if (!(tmp_obj = PyString_FromString(sqlite3_libversion()))) {
goto error;
}
PyDict_SetItemString(dict, "sqlite_version", tmp_obj);
Py_DECREF(tmp_obj);
/* initialize microprotocols layer */
pysqlite_microprotocols_init(dict);
/* initialize the default converters */
converters_init(dict);
_enable_callback_tracebacks = 0;
pysqlite_BaseTypeAdapted = 0;
/* Original comment from _bsddb.c in the Python core. This is also still
* needed nowadays for Python 2.3/2.4.
*
* PyEval_InitThreads is called here due to a quirk in python 1.5
* - 2.2.1 (at least) according to Russell Williamson <merel@wt.net>:
* The global interpreter lock is not initialized until the first
* thread is created using thread.start_new_thread() or fork() is
* called. that would cause the ALLOW_THREADS here to segfault due
* to a null pointer reference if no threads or child processes
* have been created. This works around that and is a no-op if
* threads have already been initialized.
* (see pybsddb-users mailing list post on 2002-08-07)
*/
PyEval_InitThreads();
error:
if (PyErr_Occurred())
{
PyErr_SetString(PyExc_ImportError, MODULE_NAME ": init failed");
}
}
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