summaryrefslogtreecommitdiffstats
path: root/Modules/_sqlite/statement.c
blob: f1c0e7ca7a9a72a321148ae08090cbcf442393f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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
/* statement.c - the statement type
 *
 * Copyright (C) 2005-2007 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 "statement.h"
#include "cursor.h"
#include "connection.h"
#include "microprotocols.h"
#include "prepare_protocol.h"
#include "sqlitecompat.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;

    self->st = NULL;
    self->in_use = 0;

    sql_cstr = _PyUnicode_AsStringAndSize(sql, &sql_cstr_len);
    if (sql_cstr == NULL) {
        rc = PYSQLITE_SQL_WRONG_TYPE;
        return rc;
    }

    self->in_weakreflist = NULL;
    Py_INCREF(sql);
    self->sql = sql;

    Py_BEGIN_ALLOW_THREADS
    rc = sqlite3_prepare(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 allow_8bit_chars)
{
    int rc = SQLITE_OK;
    PY_LONG_LONG longlongval;
    const char* buffer;
    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:
            /* in the overflow error case, longval/longlongval is -1, and an exception is set */
            longlongval = PyLong_AsLongLong(parameter);
            rc = sqlite3_bind_int64(self->st, pos, (sqlite_int64)longlongval);
            break;
        case TYPE_FLOAT:
            rc = sqlite3_bind_double(self->st, pos, PyFloat_AsDouble(parameter));
            break;
        case TYPE_UNICODE:
            string = _PyUnicode_AsString(parameter);
            rc = sqlite3_bind_text(self->st, pos, string, -1, SQLITE_TRANSIENT);
            break;
        case TYPE_BUFFER:
            if (PyObject_AsCharBuffer(parameter, &buffer, &buflen) == 0) {
                rc = sqlite3_bind_blob(self->st, pos, buffer, buflen, SQLITE_TRANSIENT);
            } else {
                PyErr_SetString(PyExc_ValueError, "could not convert BLOB to buffer");
                rc = -1;
            }
            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, int allow_8bit_chars)
{
    PyObject* current_param;
    PyObject* adapted;
    const char* binding_name;
    int i;
    int rc;
    int num_params_needed;
    int 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 %d 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, allow_8bit_chars);
            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, (char*)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, allow_8bit_chars);
            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_recompile(pysqlite_Statement* self, PyObject* params)
{
    const char* tail;
    int rc;
    const char* sql_cstr;
    Py_ssize_t sql_len;
    sqlite3_stmt* new_st;

    sql_cstr = _PyUnicode_AsStringAndSize(self->sql, &sql_len);
    if (sql_cstr == NULL) {
        rc = PYSQLITE_SQL_WRONG_TYPE;
        return rc;
    }

    Py_BEGIN_ALLOW_THREADS
    rc = sqlite3_prepare(self->db,
                         sql_cstr,
                         -1,
                         &new_st,
                         &tail);
    Py_END_ALLOW_THREADS

    if (rc == SQLITE_OK) {
        /* The efficient sqlite3_transfer_bindings is only available in SQLite
         * version 3.2.2 or later. For older SQLite releases, that might not
         * even define SQLITE_VERSION_NUMBER, we do it the manual way.
         */
        #ifdef SQLITE_VERSION_NUMBER
        #if SQLITE_VERSION_NUMBER >= 3002002
        /* The check for the number of parameters is necessary to not trigger a
         * bug in certain SQLite versions (experienced in 3.2.8 and 3.3.4). */
        if (sqlite3_bind_parameter_count(self->st) > 0) {
            (void)sqlite3_transfer_bindings(self->st, new_st);
        }
        #endif
        #else
        statement_bind_parameters(self, params);
        #endif

        (void)sqlite3_finalize(self->st);
        self->st = new_st;
    }

    return rc;
}

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)
{
    int rc;

    if (self->st) {
        Py_BEGIN_ALLOW_THREADS
        rc = 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_compare */
        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);
}