cpython/Modules/_sqlite/statement.c at 3.7 · python-emscripten/cpython · GitHub

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/* statement.c - the statement type

* 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 "statement.h"

#include "cursor.h"

#include "connection.h"

#include "microprotocols.h"

#include "prepare_protocol.h"

#include "util.h"

/* prototypes */

static int pysqlite_check_remaining_sql(const char* tail);

typedef enum {

LINECOMMENT_1,

IN_LINECOMMENT,

COMMENTSTART_1,

IN_COMMENT,

COMMENTEND_1,

NORMAL

} parse_remaining_sql_state;

typedef enum {

TYPE_LONG,

TYPE_FLOAT,

TYPE_UNICODE,

TYPE_BUFFER,

TYPE_UNKNOWN

} parameter_type;

int pysqlite_statement_create(pysqlite_Statement* self, pysqlite_Connection* connection, PyObject* sql)

{

const char* tail;

int rc;

const char* sql_cstr;

Py_ssize_t sql_cstr_len;

const char* p;

self->st = NULL;

self->in_use = 0;

sql_cstr = PyUnicode_AsUTF8AndSize(sql, &sql_cstr_len);

if (sql_cstr == NULL) {

rc = PYSQLITE_SQL_WRONG_TYPE;

return rc;

}

if (strlen(sql_cstr) != (size_t)sql_cstr_len) {

PyErr_SetString(PyExc_ValueError, "the query contains a null character");

return PYSQLITE_SQL_WRONG_TYPE;

}

self->in_weakreflist = NULL;

Py_INCREF(sql);

self->sql = sql;

/* Determine if the statement is a DML statement.

SELECT is the only exception. See #9924. */

self->is_dml = 0;

for (p = sql_cstr; *p != 0; p++) {

switch (*p) {

case ' ':

case '\r':

case '\n':

case '\t':

continue;

}

self->is_dml = (PyOS_strnicmp(p, "insert", 6) == 0)

|| (PyOS_strnicmp(p, "update", 6) == 0)

|| (PyOS_strnicmp(p, "delete", 6) == 0)

|| (PyOS_strnicmp(p, "replace", 7) == 0);

break;

}

Py_BEGIN_ALLOW_THREADS

rc = sqlite3_prepare_v2(connection->db,

sql_cstr,

-1,

&self->st,

&tail);

Py_END_ALLOW_THREADS

self->db = connection->db;

if (rc == SQLITE_OK && pysqlite_check_remaining_sql(tail)) {

(void)sqlite3_finalize(self->st);

self->st = NULL;

rc = PYSQLITE_TOO_MUCH_SQL;

}

return rc;

}

int pysqlite_statement_bind_parameter(pysqlite_Statement* self, int pos, PyObject* parameter)

{

int rc = SQLITE_OK;

const char *string;

Py_ssize_t buflen;

parameter_type paramtype;

if (parameter == Py_None) {

rc = sqlite3_bind_null(self->st, pos);

goto final;

}

if (PyLong_CheckExact(parameter)) {

paramtype = TYPE_LONG;

} else if (PyFloat_CheckExact(parameter)) {

paramtype = TYPE_FLOAT;

} else if (PyUnicode_CheckExact(parameter)) {

paramtype = TYPE_UNICODE;

} else if (PyLong_Check(parameter)) {

paramtype = TYPE_LONG;

} else if (PyFloat_Check(parameter)) {

paramtype = TYPE_FLOAT;

} else if (PyUnicode_Check(parameter)) {

paramtype = TYPE_UNICODE;

} else if (PyObject_CheckBuffer(parameter)) {

paramtype = TYPE_BUFFER;

} else {

paramtype = TYPE_UNKNOWN;

}

switch (paramtype) {

case TYPE_LONG: {

sqlite_int64 value = _pysqlite_long_as_int64(parameter);

if (value == -1 && PyErr_Occurred())

rc = -1;

else

rc = sqlite3_bind_int64(self->st, pos, value);

break;

}

case TYPE_FLOAT:

rc = sqlite3_bind_double(self->st, pos, PyFloat_AsDouble(parameter));

break;

case TYPE_UNICODE:

string = PyUnicode_AsUTF8AndSize(parameter, &buflen);

if (string == NULL)

return -1;

if (buflen > INT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"string longer than INT_MAX bytes");

return -1;

}

rc = sqlite3_bind_text(self->st, pos, string, (int)buflen, SQLITE_TRANSIENT);

break;

case TYPE_BUFFER: {

Py_buffer view;

if (PyObject_GetBuffer(parameter, &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;

}

rc = sqlite3_bind_blob(self->st, pos, view.buf, (int)view.len, SQLITE_TRANSIENT);

PyBuffer_Release(&view);

break;

}

case TYPE_UNKNOWN:

rc = -1;

}

final:

return rc;

}

/* returns 0 if the object is one of Python's internal ones that don't need to be adapted */

static int _need_adapt(PyObject* obj)

{

if (pysqlite_BaseTypeAdapted) {

return 1;

}

if (PyLong_CheckExact(obj) || PyFloat_CheckExact(obj)

|| PyUnicode_CheckExact(obj) || PyByteArray_CheckExact(obj)) {

return 0;

} else {

return 1;

}

void pysqlite_statement_bind_parameters(pysqlite_Statement* self, PyObject* parameters)

{

PyObject* current_param;

PyObject* adapted;

const char* binding_name;

int i;

int rc;

int num_params_needed;

Py_ssize_t num_params;

Py_BEGIN_ALLOW_THREADS

num_params_needed = sqlite3_bind_parameter_count(self->st);

Py_END_ALLOW_THREADS

if (PyTuple_CheckExact(parameters) || PyList_CheckExact(parameters) || (!PyDict_Check(parameters) && PySequence_Check(parameters))) {

/* parameters passed as sequence */

if (PyTuple_CheckExact(parameters)) {

num_params = PyTuple_GET_SIZE(parameters);

} else if (PyList_CheckExact(parameters)) {

num_params = PyList_GET_SIZE(parameters);

} else {

num_params = PySequence_Size(parameters);

}

if (num_params != num_params_needed) {

PyErr_Format(pysqlite_ProgrammingError,

"Incorrect number of bindings supplied. The current "

"statement uses %d, and there are %zd supplied.",

num_params_needed, num_params);

return;

}

for (i = 0; i < num_params; i++) {

if (PyTuple_CheckExact(parameters)) {

current_param = PyTuple_GET_ITEM(parameters, i);

Py_XINCREF(current_param);

} else if (PyList_CheckExact(parameters)) {

current_param = PyList_GET_ITEM(parameters, i);

Py_XINCREF(current_param);

} else {

current_param = PySequence_GetItem(parameters, i);

}

if (!current_param) {

return;

}

if (!_need_adapt(current_param)) {

adapted = current_param;

} else {

adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);

if (adapted) {

Py_DECREF(current_param);

} else {

PyErr_Clear();

adapted = current_param;

}

rc = pysqlite_statement_bind_parameter(self, i + 1, adapted);

Py_DECREF(adapted);

if (rc != SQLITE_OK) {

if (!PyErr_Occurred()) {

PyErr_Format(pysqlite_InterfaceError, "Error binding parameter %d - probably unsupported type.", i);

}

return;

}

} else if (PyDict_Check(parameters)) {

/* parameters passed as dictionary */

for (i = 1; i <= num_params_needed; i++) {

Py_BEGIN_ALLOW_THREADS

binding_name = sqlite3_bind_parameter_name(self->st, i);

Py_END_ALLOW_THREADS

if (!binding_name) {

PyErr_Format(pysqlite_ProgrammingError, "Binding %d has no name, but you supplied a dictionary (which has only names).", i);

return;

}

binding_name++; /* skip first char (the colon) */

if (PyDict_CheckExact(parameters)) {

current_param = PyDict_GetItemString(parameters, binding_name);

Py_XINCREF(current_param);

} else {

current_param = PyMapping_GetItemString(parameters, binding_name);

}

if (!current_param) {

PyErr_Format(pysqlite_ProgrammingError, "You did not supply a value for binding %d.", i);

return;

}

if (!_need_adapt(current_param)) {

adapted = current_param;

} else {

adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);

if (adapted) {

Py_DECREF(current_param);

} else {

PyErr_Clear();

adapted = current_param;

}

rc = pysqlite_statement_bind_parameter(self, i, adapted);

Py_DECREF(adapted);

if (rc != SQLITE_OK) {

if (!PyErr_Occurred()) {

PyErr_Format(pysqlite_InterfaceError, "Error binding parameter :%s - probably unsupported type.", binding_name);

}

return;

}

} else {

PyErr_SetString(PyExc_ValueError, "parameters are of unsupported type");

}

int pysqlite_statement_finalize(pysqlite_Statement* self)

{

int rc;

rc = SQLITE_OK;

if (self->st) {

Py_BEGIN_ALLOW_THREADS

rc = sqlite3_finalize(self->st);

Py_END_ALLOW_THREADS

self->st = NULL;

}

self->in_use = 0;

return rc;

}

int pysqlite_statement_reset(pysqlite_Statement* self)

{

int rc;

rc = SQLITE_OK;

if (self->in_use && self->st) {

Py_BEGIN_ALLOW_THREADS

rc = sqlite3_reset(self->st);

Py_END_ALLOW_THREADS

if (rc == SQLITE_OK) {

self->in_use = 0;

}

return rc;

}

void pysqlite_statement_mark_dirty(pysqlite_Statement* self)

{

self->in_use = 1;

}

void pysqlite_statement_dealloc(pysqlite_Statement* self)

{

if (self->st) {

Py_BEGIN_ALLOW_THREADS

sqlite3_finalize(self->st);

Py_END_ALLOW_THREADS

}

self->st = NULL;

Py_XDECREF(self->sql);

if (self->in_weakreflist != NULL) {

PyObject_ClearWeakRefs((PyObject*)self);

}

Py_TYPE(self)->tp_free((PyObject*)self);

}

* Checks if there is anything left in an SQL string after SQLite compiled it.

* This is used to check if somebody tried to execute more than one SQL command

* with one execute()/executemany() command, which the DB-API and we don't

* allow.

* Returns 1 if there is more left than should be. 0 if ok.

static int pysqlite_check_remaining_sql(const char* tail)

{

const char* pos = tail;

parse_remaining_sql_state state = NORMAL;

for (;;) {

switch (*pos) {

case 0:

return 0;

case '-':

if (state == NORMAL) {

state = LINECOMMENT_1;

} else if (state == LINECOMMENT_1) {

state = IN_LINECOMMENT;

}

break;

case ' ':

case '\t':

break;

case '\n':

case 13:

if (state == IN_LINECOMMENT) {

state = NORMAL;

}

break;

case '/':

if (state == NORMAL) {

state = COMMENTSTART_1;

} else if (state == COMMENTEND_1) {

state = NORMAL;

} else if (state == COMMENTSTART_1) {

return 1;

}

break;

case '*':

if (state == NORMAL) {

return 1;

} else if (state == LINECOMMENT_1) {

return 1;

} else if (state == COMMENTSTART_1) {

state = IN_COMMENT;

} else if (state == IN_COMMENT) {

state = COMMENTEND_1;

}

break;

default:

if (state == COMMENTEND_1) {

state = IN_COMMENT;

} else if (state == IN_LINECOMMENT) {

} else if (state == IN_COMMENT) {

} else {

return 1;

}

pos++;

}

return 0;

}

PyTypeObject pysqlite_StatementType = {

PyVarObject_HEAD_INIT(NULL, 0)

MODULE_NAME ".Statement", /* tp_name */

sizeof(pysqlite_Statement), /* tp_basicsize */

0, /* tp_itemsize */

(destructor)pysqlite_statement_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 */

0, /* tp_call */

0, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT, /* tp_flags */

0, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

offsetof(pysqlite_Statement, in_weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

0, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

(initproc)0, /* tp_init */

0, /* tp_alloc */

0, /* tp_new */

0 /* tp_free */

};

extern int pysqlite_statement_setup_types(void)

{

pysqlite_StatementType.tp_new = PyType_GenericNew;

return PyType_Ready(&pysqlite_StatementType);

}

cpython/Modules/_sqlite/statement.c at 3.7 · python-emscripten/cpython · GitHub

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