508 lines
16 KiB
C
508 lines
16 KiB
C
/* statement.c - the statement type
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*
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* Copyright (C) 2005-2010 Gerhard Häring <gh@ghaering.de>
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*
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* This file is part of pysqlite.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "statement.h"
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#include "cursor.h"
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#include "connection.h"
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#include "microprotocols.h"
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#include "prepare_protocol.h"
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#include "sqlitecompat.h"
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/* prototypes */
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static int pysqlite_check_remaining_sql(const char* tail);
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typedef enum {
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LINECOMMENT_1,
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IN_LINECOMMENT,
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COMMENTSTART_1,
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IN_COMMENT,
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COMMENTEND_1,
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NORMAL
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} parse_remaining_sql_state;
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typedef enum {
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TYPE_LONG,
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TYPE_FLOAT,
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TYPE_UNICODE,
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TYPE_BUFFER,
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TYPE_UNKNOWN
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} parameter_type;
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int pysqlite_statement_create(pysqlite_Statement* self, pysqlite_Connection* connection, PyObject* sql)
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{
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const char* tail;
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int rc;
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const char* sql_cstr;
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Py_ssize_t sql_cstr_len;
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self->st = NULL;
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self->in_use = 0;
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sql_cstr = _PyUnicode_AsStringAndSize(sql, &sql_cstr_len);
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if (sql_cstr == NULL) {
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rc = PYSQLITE_SQL_WRONG_TYPE;
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return rc;
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}
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self->in_weakreflist = NULL;
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Py_INCREF(sql);
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self->sql = sql;
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Py_BEGIN_ALLOW_THREADS
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rc = sqlite3_prepare(connection->db,
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sql_cstr,
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-1,
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&self->st,
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&tail);
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Py_END_ALLOW_THREADS
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self->db = connection->db;
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if (rc == SQLITE_OK && pysqlite_check_remaining_sql(tail)) {
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(void)sqlite3_finalize(self->st);
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self->st = NULL;
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rc = PYSQLITE_TOO_MUCH_SQL;
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}
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return rc;
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}
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int pysqlite_statement_bind_parameter(pysqlite_Statement* self, int pos, PyObject* parameter, int allow_8bit_chars)
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{
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int rc = SQLITE_OK;
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PY_LONG_LONG longlongval;
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const char* buffer;
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char* string;
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Py_ssize_t buflen;
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parameter_type paramtype;
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if (parameter == Py_None) {
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rc = sqlite3_bind_null(self->st, pos);
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goto final;
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}
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if (PyLong_CheckExact(parameter)) {
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paramtype = TYPE_LONG;
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} else if (PyFloat_CheckExact(parameter)) {
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paramtype = TYPE_FLOAT;
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} else if (PyUnicode_CheckExact(parameter)) {
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paramtype = TYPE_UNICODE;
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} else if (PyLong_Check(parameter)) {
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paramtype = TYPE_LONG;
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} else if (PyFloat_Check(parameter)) {
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paramtype = TYPE_FLOAT;
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} else if (PyUnicode_Check(parameter)) {
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paramtype = TYPE_UNICODE;
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} else if (PyObject_CheckBuffer(parameter)) {
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paramtype = TYPE_BUFFER;
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} else {
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paramtype = TYPE_UNKNOWN;
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}
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switch (paramtype) {
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case TYPE_LONG:
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/* in the overflow error case, longval/longlongval is -1, and an exception is set */
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longlongval = PyLong_AsLongLong(parameter);
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rc = sqlite3_bind_int64(self->st, pos, (sqlite_int64)longlongval);
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break;
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case TYPE_FLOAT:
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rc = sqlite3_bind_double(self->st, pos, PyFloat_AsDouble(parameter));
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break;
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case TYPE_UNICODE:
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string = _PyUnicode_AsString(parameter);
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if (string != NULL)
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rc = sqlite3_bind_text(self->st, pos, string, -1, SQLITE_TRANSIENT);
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else
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rc = -1;
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break;
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case TYPE_BUFFER:
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if (PyObject_AsCharBuffer(parameter, &buffer, &buflen) == 0) {
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rc = sqlite3_bind_blob(self->st, pos, buffer, buflen, SQLITE_TRANSIENT);
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} else {
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PyErr_SetString(PyExc_ValueError, "could not convert BLOB to buffer");
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rc = -1;
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}
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break;
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case TYPE_UNKNOWN:
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rc = -1;
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}
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final:
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return rc;
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}
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/* returns 0 if the object is one of Python's internal ones that don't need to be adapted */
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static int _need_adapt(PyObject* obj)
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{
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if (pysqlite_BaseTypeAdapted) {
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return 1;
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}
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if (PyLong_CheckExact(obj) || PyFloat_CheckExact(obj)
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|| PyUnicode_CheckExact(obj) || PyByteArray_CheckExact(obj)) {
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return 0;
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} else {
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return 1;
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}
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}
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void pysqlite_statement_bind_parameters(pysqlite_Statement* self, PyObject* parameters, int allow_8bit_chars)
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{
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PyObject* current_param;
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PyObject* adapted;
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const char* binding_name;
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int i;
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int rc;
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int num_params_needed;
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int num_params;
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Py_BEGIN_ALLOW_THREADS
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num_params_needed = sqlite3_bind_parameter_count(self->st);
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Py_END_ALLOW_THREADS
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if (PyTuple_CheckExact(parameters) || PyList_CheckExact(parameters) || (!PyDict_Check(parameters) && PySequence_Check(parameters))) {
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/* parameters passed as sequence */
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if (PyTuple_CheckExact(parameters)) {
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num_params = PyTuple_GET_SIZE(parameters);
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} else if (PyList_CheckExact(parameters)) {
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num_params = PyList_GET_SIZE(parameters);
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} else {
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num_params = PySequence_Size(parameters);
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}
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if (num_params != num_params_needed) {
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PyErr_Format(pysqlite_ProgrammingError, "Incorrect number of bindings supplied. The current statement uses %d, and there are %d supplied.",
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num_params_needed, num_params);
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return;
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}
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for (i = 0; i < num_params; i++) {
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if (PyTuple_CheckExact(parameters)) {
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current_param = PyTuple_GET_ITEM(parameters, i);
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Py_XINCREF(current_param);
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} else if (PyList_CheckExact(parameters)) {
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current_param = PyList_GET_ITEM(parameters, i);
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Py_XINCREF(current_param);
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} else {
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current_param = PySequence_GetItem(parameters, i);
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}
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if (!current_param) {
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return;
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}
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if (!_need_adapt(current_param)) {
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adapted = current_param;
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} else {
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adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);
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if (adapted) {
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Py_DECREF(current_param);
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} else {
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PyErr_Clear();
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adapted = current_param;
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}
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}
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rc = pysqlite_statement_bind_parameter(self, i + 1, adapted, allow_8bit_chars);
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Py_DECREF(adapted);
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if (rc != SQLITE_OK) {
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if (!PyErr_Occurred()) {
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PyErr_Format(pysqlite_InterfaceError, "Error binding parameter %d - probably unsupported type.", i);
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}
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return;
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}
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}
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} else if (PyDict_Check(parameters)) {
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/* parameters passed as dictionary */
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for (i = 1; i <= num_params_needed; i++) {
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Py_BEGIN_ALLOW_THREADS
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binding_name = sqlite3_bind_parameter_name(self->st, i);
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Py_END_ALLOW_THREADS
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if (!binding_name) {
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PyErr_Format(pysqlite_ProgrammingError, "Binding %d has no name, but you supplied a dictionary (which has only names).", i);
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return;
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}
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binding_name++; /* skip first char (the colon) */
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if (PyDict_CheckExact(parameters)) {
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current_param = PyDict_GetItemString(parameters, binding_name);
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Py_XINCREF(current_param);
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} else {
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current_param = PyMapping_GetItemString(parameters, (char*)binding_name);
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}
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if (!current_param) {
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PyErr_Format(pysqlite_ProgrammingError, "You did not supply a value for binding %d.", i);
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return;
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}
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if (!_need_adapt(current_param)) {
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adapted = current_param;
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} else {
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adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);
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if (adapted) {
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Py_DECREF(current_param);
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} else {
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PyErr_Clear();
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adapted = current_param;
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}
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}
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rc = pysqlite_statement_bind_parameter(self, i, adapted, allow_8bit_chars);
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Py_DECREF(adapted);
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if (rc != SQLITE_OK) {
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if (!PyErr_Occurred()) {
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PyErr_Format(pysqlite_InterfaceError, "Error binding parameter :%s - probably unsupported type.", binding_name);
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}
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return;
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}
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}
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} else {
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PyErr_SetString(PyExc_ValueError, "parameters are of unsupported type");
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}
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}
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int pysqlite_statement_recompile(pysqlite_Statement* self, PyObject* params)
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{
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const char* tail;
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int rc;
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const char* sql_cstr;
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Py_ssize_t sql_len;
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sqlite3_stmt* new_st;
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sql_cstr = _PyUnicode_AsStringAndSize(self->sql, &sql_len);
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if (sql_cstr == NULL) {
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rc = PYSQLITE_SQL_WRONG_TYPE;
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return rc;
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}
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Py_BEGIN_ALLOW_THREADS
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rc = sqlite3_prepare(self->db,
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sql_cstr,
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-1,
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&new_st,
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&tail);
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Py_END_ALLOW_THREADS
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if (rc == SQLITE_OK) {
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/* The efficient sqlite3_transfer_bindings is only available in SQLite
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* version 3.2.2 or later. For older SQLite releases, that might not
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* even define SQLITE_VERSION_NUMBER, we do it the manual way.
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*/
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#ifdef SQLITE_VERSION_NUMBER
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#if SQLITE_VERSION_NUMBER >= 3002002
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/* The check for the number of parameters is necessary to not trigger a
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* bug in certain SQLite versions (experienced in 3.2.8 and 3.3.4). */
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if (sqlite3_bind_parameter_count(self->st) > 0) {
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(void)sqlite3_transfer_bindings(self->st, new_st);
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}
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#endif
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#else
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statement_bind_parameters(self, params);
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#endif
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(void)sqlite3_finalize(self->st);
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self->st = new_st;
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}
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return rc;
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}
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int pysqlite_statement_finalize(pysqlite_Statement* self)
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{
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int rc;
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rc = SQLITE_OK;
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if (self->st) {
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Py_BEGIN_ALLOW_THREADS
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rc = sqlite3_finalize(self->st);
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Py_END_ALLOW_THREADS
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self->st = NULL;
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}
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self->in_use = 0;
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return rc;
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}
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int pysqlite_statement_reset(pysqlite_Statement* self)
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{
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int rc;
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rc = SQLITE_OK;
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if (self->in_use && self->st) {
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Py_BEGIN_ALLOW_THREADS
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rc = sqlite3_reset(self->st);
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Py_END_ALLOW_THREADS
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if (rc == SQLITE_OK) {
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self->in_use = 0;
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}
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}
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return rc;
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}
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void pysqlite_statement_mark_dirty(pysqlite_Statement* self)
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{
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self->in_use = 1;
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}
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void pysqlite_statement_dealloc(pysqlite_Statement* self)
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{
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int rc;
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if (self->st) {
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Py_BEGIN_ALLOW_THREADS
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rc = sqlite3_finalize(self->st);
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Py_END_ALLOW_THREADS
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}
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self->st = NULL;
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Py_XDECREF(self->sql);
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if (self->in_weakreflist != NULL) {
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PyObject_ClearWeakRefs((PyObject*)self);
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}
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Py_TYPE(self)->tp_free((PyObject*)self);
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}
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/*
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* Checks if there is anything left in an SQL string after SQLite compiled it.
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* This is used to check if somebody tried to execute more than one SQL command
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* with one execute()/executemany() command, which the DB-API and we don't
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* allow.
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*
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* Returns 1 if there is more left than should be. 0 if ok.
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*/
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static int pysqlite_check_remaining_sql(const char* tail)
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{
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const char* pos = tail;
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parse_remaining_sql_state state = NORMAL;
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for (;;) {
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switch (*pos) {
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case 0:
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return 0;
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case '-':
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if (state == NORMAL) {
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state = LINECOMMENT_1;
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} else if (state == LINECOMMENT_1) {
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state = IN_LINECOMMENT;
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}
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break;
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case ' ':
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case '\t':
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break;
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case '\n':
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case 13:
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if (state == IN_LINECOMMENT) {
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state = NORMAL;
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}
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break;
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case '/':
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if (state == NORMAL) {
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state = COMMENTSTART_1;
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} else if (state == COMMENTEND_1) {
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state = NORMAL;
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} else if (state == COMMENTSTART_1) {
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return 1;
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}
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break;
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case '*':
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if (state == NORMAL) {
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return 1;
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} else if (state == LINECOMMENT_1) {
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return 1;
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} else if (state == COMMENTSTART_1) {
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state = IN_COMMENT;
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} else if (state == IN_COMMENT) {
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state = COMMENTEND_1;
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}
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break;
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default:
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if (state == COMMENTEND_1) {
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state = IN_COMMENT;
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} else if (state == IN_LINECOMMENT) {
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} else if (state == IN_COMMENT) {
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} else {
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return 1;
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}
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}
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pos++;
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}
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return 0;
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}
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PyTypeObject pysqlite_StatementType = {
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PyVarObject_HEAD_INIT(NULL, 0)
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MODULE_NAME ".Statement", /* tp_name */
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sizeof(pysqlite_Statement), /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)pysqlite_statement_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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0, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT, /* tp_flags */
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0, /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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offsetof(pysqlite_Statement, in_weakreflist), /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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(initproc)0, /* tp_init */
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0, /* tp_alloc */
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0, /* tp_new */
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0 /* tp_free */
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};
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extern int pysqlite_statement_setup_types(void)
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{
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pysqlite_StatementType.tp_new = PyType_GenericNew;
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return PyType_Ready(&pysqlite_StatementType);
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}
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