cpython/Modules/_sqlite/statement.c at 3.8 · python/cpython · GitHub

History

505 lines (452 loc) · 16.6 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

/* 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 == -1) {

return;

}

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_INCREF(current_param);

} else if (PyList_CheckExact(parameters)) {

current_param = PyList_GetItem(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, current_param);

Py_DECREF(current_param);

if (!adapted) {

return;

}

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++) {

PyObject *binding_name_obj;

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) */

binding_name_obj = PyUnicode_FromString(binding_name);

if (!binding_name_obj) {

return;

}

if (PyDict_CheckExact(parameters)) {

current_param = PyDict_GetItemWithError(parameters, binding_name_obj);

Py_XINCREF(current_param);

} else {

current_param = PyObject_GetItem(parameters, binding_name_obj);

}

Py_DECREF(binding_name_obj);

if (!current_param) {

if (!PyErr_Occurred() || PyErr_ExceptionMatches(PyExc_LookupError)) {

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, current_param);

Py_DECREF(current_param);

if (!adapted) {

return;

}

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_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

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 3.8 · python/cpython · GitHub

Uh oh!

Uh oh!

cpython/Modules/_sqlite/statement.c at 3.8 · python/cpython · GitHub

Uh oh!

Uh oh!

Expand file tree

Breadcrumbs

statement.c

Latest commit

History

Breadcrumbs

statement.c

File metadata and controls