1/* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements.  See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License.  You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/* Overview of what this is and does:
18 * http://www.apache.org/~niq/dbd.html
19 */
20
21#ifndef APR_DBD_H
22#define APR_DBD_H
23
24#include "apu.h"
25#include "apr_pools.h"
26
27#ifdef __cplusplus
28extern "C" {
29#endif
30
31/**
32 * @file apr_dbd.h
33 * @brief APR-UTIL DBD library
34 */
35/**
36 * @defgroup APR_Util_DBD DBD routines
37 * @ingroup APR_Util
38 * @{
39 */
40
41/**
42 * Mapping of C to SQL types, used for prepared statements.
43 * @remarks
44 * For apr_dbd_p[v]query/select functions, in and out parameters are always
45 * const char * (i.e. regular nul terminated strings). LOB types are passed
46 * with four (4) arguments: payload, length, table and column, all as const
47 * char *, where table and column are reserved for future use by Oracle.
48 * @remarks
49 * For apr_dbd_p[v]bquery/select functions, in and out parameters are
50 * described next to each enumeration constant and are generally native binary
51 * types or some APR data type. LOB types are passed with four (4) arguments:
52 * payload (char*), length (apr_size_t*), table (char*) and column (char*).
53 * Table and column are reserved for future use by Oracle.
54 */
55typedef enum {
56    APR_DBD_TYPE_NONE,
57    APR_DBD_TYPE_TINY,       /**< \%hhd : in, out: char* */
58    APR_DBD_TYPE_UTINY,      /**< \%hhu : in, out: unsigned char* */
59    APR_DBD_TYPE_SHORT,      /**< \%hd  : in, out: short* */
60    APR_DBD_TYPE_USHORT,     /**< \%hu  : in, out: unsigned short* */
61    APR_DBD_TYPE_INT,        /**< \%d   : in, out: int* */
62    APR_DBD_TYPE_UINT,       /**< \%u   : in, out: unsigned int* */
63    APR_DBD_TYPE_LONG,       /**< \%ld  : in, out: long* */
64    APR_DBD_TYPE_ULONG,      /**< \%lu  : in, out: unsigned long* */
65    APR_DBD_TYPE_LONGLONG,   /**< \%lld : in, out: apr_int64_t* */
66    APR_DBD_TYPE_ULONGLONG,  /**< \%llu : in, out: apr_uint64_t* */
67    APR_DBD_TYPE_FLOAT,      /**< \%f   : in, out: float* */
68    APR_DBD_TYPE_DOUBLE,     /**< \%lf  : in, out: double* */
69    APR_DBD_TYPE_STRING,     /**< \%s   : in: char*, out: char** */
70    APR_DBD_TYPE_TEXT,       /**< \%pDt : in: char*, out: char** */
71    APR_DBD_TYPE_TIME,       /**< \%pDi : in: char*, out: char** */
72    APR_DBD_TYPE_DATE,       /**< \%pDd : in: char*, out: char** */
73    APR_DBD_TYPE_DATETIME,   /**< \%pDa : in: char*, out: char** */
74    APR_DBD_TYPE_TIMESTAMP,  /**< \%pDs : in: char*, out: char** */
75    APR_DBD_TYPE_ZTIMESTAMP, /**< \%pDz : in: char*, out: char** */
76    APR_DBD_TYPE_BLOB,       /**< \%pDb : in: char* apr_size_t* char* char*, out: apr_bucket_brigade* */
77    APR_DBD_TYPE_CLOB,       /**< \%pDc : in: char* apr_size_t* char* char*, out: apr_bucket_brigade* */
78    APR_DBD_TYPE_NULL        /**< \%pDn : in: void*, out: void** */
79} apr_dbd_type_e;
80
81/* These are opaque structs.  Instantiation is up to each backend */
82typedef struct apr_dbd_driver_t apr_dbd_driver_t;
83typedef struct apr_dbd_t apr_dbd_t;
84typedef struct apr_dbd_transaction_t apr_dbd_transaction_t;
85typedef struct apr_dbd_results_t apr_dbd_results_t;
86typedef struct apr_dbd_row_t apr_dbd_row_t;
87typedef struct apr_dbd_prepared_t apr_dbd_prepared_t;
88
89/** apr_dbd_init: perform once-only initialisation.  Call once only.
90 *
91 *  @param pool - pool to register any shutdown cleanups, etc
92 */
93APU_DECLARE(apr_status_t) apr_dbd_init(apr_pool_t *pool);
94
95/** apr_dbd_get_driver: get the driver struct for a name
96 *
97 *  @param pool - (process) pool to register cleanup
98 *  @param name - driver name
99 *  @param driver - pointer to driver struct.
100 *  @return APR_SUCCESS for success
101 *  @return APR_ENOTIMPL for no driver (when DSO not enabled)
102 *  @return APR_EDSOOPEN if DSO driver file can't be opened
103 *  @return APR_ESYMNOTFOUND if the driver file doesn't contain a driver
104 */
105APU_DECLARE(apr_status_t) apr_dbd_get_driver(apr_pool_t *pool, const char *name,
106                                             const apr_dbd_driver_t **driver);
107
108/** apr_dbd_open_ex: open a connection to a backend
109 *
110 *  @param driver - driver struct.
111 *  @param pool - working pool
112 *  @param params - arguments to driver (implementation-dependent)
113 *  @param handle - pointer to handle to return
114 *  @param error - descriptive error.
115 *  @return APR_SUCCESS for success
116 *  @return APR_EGENERAL if driver exists but connection failed
117 *  @remarks PostgreSQL: the params is passed directly to the PQconnectdb()
118 *  function (check PostgreSQL documentation for more details on the syntax).
119 *  @remarks SQLite2: the params is split on a colon, with the first part used
120 *  as the filename and second part converted to an integer and used as file
121 *  mode.
122 *  @remarks SQLite3: the params is passed directly to the sqlite3_open()
123 *  function as a filename to be opened (check SQLite3 documentation for more
124 *  details).
125 *  @remarks Oracle: the params can have "user", "pass", "dbname" and "server"
126 *  keys, each followed by an equal sign and a value. Such key/value pairs can
127 *  be delimited by space, CR, LF, tab, semicolon, vertical bar or comma.
128 *  @remarks MySQL: the params can have "host", "port", "user", "pass",
129 *  "dbname", "sock", "flags" "fldsz", "group" and "reconnect" keys, each
130 *  followed by an equal sign and a value. Such key/value pairs can be
131 *  delimited by space, CR, LF, tab, semicolon, vertical bar or comma. For
132 *  now, "flags" can only recognise CLIENT_FOUND_ROWS (check MySQL manual for
133 *  details). The value associated with "fldsz" determines maximum amount of
134 *  memory (in bytes) for each of the fields in the result set of prepared
135 *  statements. By default, this value is 1 MB. The value associated with
136 *  "group" determines which group from configuration file to use (see
137 *  MYSQL_READ_DEFAULT_GROUP option of mysql_options() in MySQL manual).
138 *  Reconnect is set to 1 by default (i.e. true).
139 */
140APU_DECLARE(apr_status_t) apr_dbd_open_ex(const apr_dbd_driver_t *driver,
141                                          apr_pool_t *pool, const char *params,
142                                          apr_dbd_t **handle,
143                                          const char **error);
144
145/** apr_dbd_open: open a connection to a backend
146 *
147 *  @param driver - driver struct.
148 *  @param pool - working pool
149 *  @param params - arguments to driver (implementation-dependent)
150 *  @param handle - pointer to handle to return
151 *  @return APR_SUCCESS for success
152 *  @return APR_EGENERAL if driver exists but connection failed
153 *  @see apr_dbd_open_ex
154 */
155APU_DECLARE(apr_status_t) apr_dbd_open(const apr_dbd_driver_t *driver,
156                                       apr_pool_t *pool, const char *params,
157                                       apr_dbd_t **handle);
158
159/** apr_dbd_close: close a connection to a backend
160 *
161 *  @param driver - driver struct.
162 *  @param handle - handle to close
163 *  @return APR_SUCCESS for success or error status
164 */
165APU_DECLARE(apr_status_t) apr_dbd_close(const apr_dbd_driver_t *driver,
166                                        apr_dbd_t *handle);
167
168/* apr-function-shaped versions of things */
169
170/** apr_dbd_name: get the name of the driver
171 *
172 *  @param driver - the driver
173 *  @return - name
174 */
175APU_DECLARE(const char*) apr_dbd_name(const apr_dbd_driver_t *driver);
176
177/** apr_dbd_native_handle: get native database handle of the underlying db
178 *
179 *  @param driver - the driver
180 *  @param handle - apr_dbd handle
181 *  @return - native handle
182 */
183APU_DECLARE(void*) apr_dbd_native_handle(const apr_dbd_driver_t *driver,
184                                         apr_dbd_t *handle);
185
186/** check_conn: check status of a database connection
187 *
188 *  @param driver - the driver
189 *  @param pool - working pool
190 *  @param handle - the connection to check
191 *  @return APR_SUCCESS or error
192 */
193APU_DECLARE(int) apr_dbd_check_conn(const apr_dbd_driver_t *driver, apr_pool_t *pool,
194                                    apr_dbd_t *handle);
195
196/** apr_dbd_set_dbname: select database name.  May be a no-op if not supported.
197 *
198 *  @param driver - the driver
199 *  @param pool - working pool
200 *  @param handle - the connection
201 *  @param name - the database to select
202 *  @return 0 for success or error code
203 */
204APU_DECLARE(int) apr_dbd_set_dbname(const apr_dbd_driver_t *driver, apr_pool_t *pool,
205                                    apr_dbd_t *handle, const char *name);
206
207/** apr_dbd_transaction_start: start a transaction.  May be a no-op.
208 *
209 *  @param driver - the driver
210 *  @param pool - a pool to use for error messages (if any).
211 *  @param handle - the db connection
212 *  @param trans - ptr to a transaction.  May be null on entry
213 *  @return 0 for success or error code
214 *  @remarks Note that transaction modes, set by calling
215 *  apr_dbd_transaction_mode_set(), will affect all query/select calls within
216 *  a transaction. By default, any error in query/select during a transaction
217 *  will cause the transaction to inherit the error code and any further
218 *  query/select calls will fail immediately. Put transaction in "ignore
219 *  errors" mode to avoid that. Use "rollback" mode to do explicit rollback.
220 */
221APU_DECLARE(int) apr_dbd_transaction_start(const apr_dbd_driver_t *driver,
222                                           apr_pool_t *pool,
223                                           apr_dbd_t *handle,
224                                           apr_dbd_transaction_t **trans);
225
226/** apr_dbd_transaction_end: end a transaction
227 *  (commit on success, rollback on error).
228 *  May be a no-op.
229 *
230 *  @param driver - the driver
231 *  @param handle - the db connection
232 *  @param trans - the transaction.
233 *  @return 0 for success or error code
234 */
235APU_DECLARE(int) apr_dbd_transaction_end(const apr_dbd_driver_t *driver,
236                                         apr_pool_t *pool,
237                                         apr_dbd_transaction_t *trans);
238
239#define APR_DBD_TRANSACTION_COMMIT        0x00  /**< commit the transaction */
240#define APR_DBD_TRANSACTION_ROLLBACK      0x01  /**< rollback the transaction */
241#define APR_DBD_TRANSACTION_IGNORE_ERRORS 0x02  /**< ignore transaction errors */
242
243/** apr_dbd_transaction_mode_get: get the mode of transaction
244 *
245 *  @param driver - the driver
246 *  @param trans  - the transaction
247 *  @return mode of transaction
248 */
249APU_DECLARE(int) apr_dbd_transaction_mode_get(const apr_dbd_driver_t *driver,
250                                              apr_dbd_transaction_t *trans);
251
252/** apr_dbd_transaction_mode_set: set the mode of transaction
253 *
254 *  @param driver - the driver
255 *  @param trans  - the transaction
256 *  @param mode   - new mode of the transaction
257 *  @return the mode of transaction in force after the call
258 */
259APU_DECLARE(int) apr_dbd_transaction_mode_set(const apr_dbd_driver_t *driver,
260                                              apr_dbd_transaction_t *trans,
261                                              int mode);
262
263/** apr_dbd_query: execute an SQL query that doesn't return a result set
264 *
265 *  @param driver - the driver
266 *  @param handle - the connection
267 *  @param nrows - number of rows affected.
268 *  @param statement - the SQL statement to execute
269 *  @return 0 for success or error code
270 */
271APU_DECLARE(int) apr_dbd_query(const apr_dbd_driver_t *driver, apr_dbd_t *handle,
272                               int *nrows, const char *statement);
273
274/** apr_dbd_select: execute an SQL query that returns a result set
275 *
276 *  @param driver - the driver
277 *  @param pool - pool to allocate the result set
278 *  @param handle - the connection
279 *  @param res - pointer to result set pointer.  May point to NULL on entry
280 *  @param statement - the SQL statement to execute
281 *  @param random - 1 to support random access to results (seek any row);
282 *                  0 to support only looping through results in order
283 *                    (async access - faster)
284 *  @return 0 for success or error code
285 */
286APU_DECLARE(int) apr_dbd_select(const apr_dbd_driver_t *driver, apr_pool_t *pool,
287                                apr_dbd_t *handle, apr_dbd_results_t **res,
288                                const char *statement, int random);
289
290/** apr_dbd_num_cols: get the number of columns in a results set
291 *
292 *  @param driver - the driver
293 *  @param res - result set.
294 *  @return number of columns
295 */
296APU_DECLARE(int) apr_dbd_num_cols(const apr_dbd_driver_t *driver,
297                                  apr_dbd_results_t *res);
298
299/** apr_dbd_num_tuples: get the number of rows in a results set
300 *  of a synchronous select
301 *
302 *  @param driver - the driver
303 *  @param res - result set.
304 *  @return number of rows, or -1 if the results are asynchronous
305 */
306APU_DECLARE(int) apr_dbd_num_tuples(const apr_dbd_driver_t *driver,
307                                    apr_dbd_results_t *res);
308
309/** apr_dbd_get_row: get a row from a result set
310 *
311 *  @param driver - the driver
312 *  @param pool - pool to allocate the row
313 *  @param res - result set pointer
314 *  @param row - pointer to row pointer.  May point to NULL on entry
315 *  @param rownum - row number (counting from 1), or -1 for "next row".
316 *                  Ignored if random access is not supported.
317 *  @return 0 for success, -1 for rownum out of range or data finished
318 */
319APU_DECLARE(int) apr_dbd_get_row(const apr_dbd_driver_t *driver, apr_pool_t *pool,
320                                 apr_dbd_results_t *res, apr_dbd_row_t **row,
321                                 int rownum);
322
323/** apr_dbd_get_entry: get an entry from a row
324 *
325 *  @param driver - the driver
326 *  @param row - row pointer
327 *  @param col - entry number
328 *  @return value from the row, or NULL if col is out of bounds.
329 */
330APU_DECLARE(const char*) apr_dbd_get_entry(const apr_dbd_driver_t *driver,
331                                           apr_dbd_row_t *row, int col);
332
333/** apr_dbd_get_name: get an entry name from a result set
334 *
335 *  @param driver - the driver
336 *  @param res - result set pointer
337 *  @param col - entry number
338 *  @return name of the entry, or NULL if col is out of bounds.
339 */
340APU_DECLARE(const char*) apr_dbd_get_name(const apr_dbd_driver_t *driver,
341                                          apr_dbd_results_t *res, int col);
342
343
344/** apr_dbd_error: get current error message (if any)
345 *
346 *  @param driver - the driver
347 *  @param handle - the connection
348 *  @param errnum - error code from operation that returned an error
349 *  @return the database current error message, or message for errnum
350 *          (implementation-dependent whether errnum is ignored)
351 */
352APU_DECLARE(const char*) apr_dbd_error(const apr_dbd_driver_t *driver,
353                                       apr_dbd_t *handle, int errnum);
354
355/** apr_dbd_escape: escape a string so it is safe for use in query/select
356 *
357 *  @param driver - the driver
358 *  @param pool - pool to alloc the result from
359 *  @param string - the string to escape
360 *  @param handle - the connection
361 *  @return the escaped, safe string
362 */
363APU_DECLARE(const char*) apr_dbd_escape(const apr_dbd_driver_t *driver,
364                                        apr_pool_t *pool, const char *string,
365                                        apr_dbd_t *handle);
366
367/** apr_dbd_prepare: prepare a statement
368 *
369 *  @param driver - the driver
370 *  @param pool - pool to alloc the result from
371 *  @param handle - the connection
372 *  @param query - the SQL query
373 *  @param label - A label for the prepared statement.
374 *                 use NULL for temporary prepared statements
375 *                 (eg within a Request in httpd)
376 *  @param statement - statement to prepare.  May point to null on entry.
377 *  @return 0 for success or error code
378 *  @remarks To specify parameters of the prepared query, use \%s, \%d etc.
379 *  (see below for full list) in place of database specific parameter syntax
380 *  (e.g.  for PostgreSQL, this would be $1, $2, for SQLite3 this would be ?
381 *  etc.).  For instance: "SELECT name FROM customers WHERE name=%s" would be
382 *  a query that this function understands.
383 *  @remarks Here is the full list of format specifiers that this function
384 *  understands and what they map to in SQL: \%hhd (TINY INT), \%hhu (UNSIGNED
385 *  TINY INT), \%hd (SHORT), \%hu (UNSIGNED SHORT), \%d (INT), \%u (UNSIGNED
386 *  INT), \%ld (LONG), \%lu (UNSIGNED LONG), \%lld (LONG LONG), \%llu
387 *  (UNSIGNED LONG LONG), \%f (FLOAT, REAL), \%lf (DOUBLE PRECISION), \%s
388 *  (VARCHAR), \%pDt (TEXT), \%pDi (TIME), \%pDd (DATE), \%pDa (DATETIME),
389 *  \%pDs (TIMESTAMP), \%pDz (TIMESTAMP WITH TIME ZONE), \%pDb (BLOB), \%pDc
390 *  (CLOB) and \%pDn (NULL). Not all databases have support for all these
391 *  types, so the underlying driver will attempt the "best match" where
392 *  possible. A \% followed by any letter not in the above list will be
393 *  interpreted as VARCHAR (i.e. \%s).
394 */
395APU_DECLARE(int) apr_dbd_prepare(const apr_dbd_driver_t *driver, apr_pool_t *pool,
396                                 apr_dbd_t *handle, const char *query,
397                                 const char *label,
398                                 apr_dbd_prepared_t **statement);
399
400
401/** apr_dbd_pquery: query using a prepared statement + args
402 *
403 *  @param driver - the driver
404 *  @param pool - working pool
405 *  @param handle - the connection
406 *  @param nrows - number of rows affected.
407 *  @param statement - the prepared statement to execute
408 *  @param nargs - ignored (for backward compatibility only)
409 *  @param args - args to prepared statement
410 *  @return 0 for success or error code
411 */
412APU_DECLARE(int) apr_dbd_pquery(const apr_dbd_driver_t *driver, apr_pool_t *pool,
413                                apr_dbd_t *handle, int *nrows,
414                                apr_dbd_prepared_t *statement, int nargs,
415                                const char **args);
416
417/** apr_dbd_pselect: select using a prepared statement + args
418 *
419 *  @param driver - the driver
420 *  @param pool - working pool
421 *  @param handle - the connection
422 *  @param res - pointer to query results.  May point to NULL on entry
423 *  @param statement - the prepared statement to execute
424 *  @param random - Whether to support random-access to results
425 *  @param nargs - ignored (for backward compatibility only)
426 *  @param args - args to prepared statement
427 *  @return 0 for success or error code
428 */
429APU_DECLARE(int) apr_dbd_pselect(const apr_dbd_driver_t *driver, apr_pool_t *pool,
430                                 apr_dbd_t *handle, apr_dbd_results_t **res,
431                                 apr_dbd_prepared_t *statement, int random,
432                                 int nargs, const char **args);
433
434/** apr_dbd_pvquery: query using a prepared statement + args
435 *
436 *  @param driver - the driver
437 *  @param pool - working pool
438 *  @param handle - the connection
439 *  @param nrows - number of rows affected.
440 *  @param statement - the prepared statement to execute
441 *  @param ... - varargs list
442 *  @return 0 for success or error code
443 */
444APU_DECLARE_NONSTD(int) apr_dbd_pvquery(const apr_dbd_driver_t *driver,
445                                        apr_pool_t *pool,
446                                        apr_dbd_t *handle, int *nrows,
447                                        apr_dbd_prepared_t *statement, ...);
448
449/** apr_dbd_pvselect: select using a prepared statement + args
450 *
451 *  @param driver - the driver
452 *  @param pool - working pool
453 *  @param handle - the connection
454 *  @param res - pointer to query results.  May point to NULL on entry
455 *  @param statement - the prepared statement to execute
456 *  @param random - Whether to support random-access to results
457 *  @param ... - varargs list
458 *  @return 0 for success or error code
459 */
460APU_DECLARE_NONSTD(int) apr_dbd_pvselect(const apr_dbd_driver_t *driver,
461                                         apr_pool_t *pool, apr_dbd_t *handle,
462                                         apr_dbd_results_t **res,
463                                         apr_dbd_prepared_t *statement,
464                                         int random, ...);
465
466/** apr_dbd_pbquery: query using a prepared statement + binary args
467 *
468 *  @param driver - the driver
469 *  @param pool - working pool
470 *  @param handle - the connection
471 *  @param nrows - number of rows affected.
472 *  @param statement - the prepared statement to execute
473 *  @param args - binary args to prepared statement
474 *  @return 0 for success or error code
475 */
476APU_DECLARE(int) apr_dbd_pbquery(const apr_dbd_driver_t *driver,
477                                 apr_pool_t *pool, apr_dbd_t *handle,
478                                 int *nrows, apr_dbd_prepared_t *statement,
479                                 const void **args);
480
481/** apr_dbd_pbselect: select using a prepared statement + binary args
482 *
483 *  @param driver - the driver
484 *  @param pool - working pool
485 *  @param handle - the connection
486 *  @param res - pointer to query results.  May point to NULL on entry
487 *  @param statement - the prepared statement to execute
488 *  @param random - Whether to support random-access to results
489 *  @param args - binary args to prepared statement
490 *  @return 0 for success or error code
491 */
492APU_DECLARE(int) apr_dbd_pbselect(const apr_dbd_driver_t *driver,
493                                  apr_pool_t *pool,
494                                  apr_dbd_t *handle, apr_dbd_results_t **res,
495                                  apr_dbd_prepared_t *statement, int random,
496                                  const void **args);
497
498/** apr_dbd_pvbquery: query using a prepared statement + binary args
499 *
500 *  @param driver - the driver
501 *  @param pool - working pool
502 *  @param handle - the connection
503 *  @param nrows - number of rows affected.
504 *  @param statement - the prepared statement to execute
505 *  @param ... - varargs list of binary args
506 *  @return 0 for success or error code
507 */
508APU_DECLARE_NONSTD(int) apr_dbd_pvbquery(const apr_dbd_driver_t *driver,
509                                         apr_pool_t *pool,
510                                         apr_dbd_t *handle, int *nrows,
511                                         apr_dbd_prepared_t *statement, ...);
512
513/** apr_dbd_pvbselect: select using a prepared statement + binary args
514 *
515 *  @param driver - the driver
516 *  @param pool - working pool
517 *  @param handle - the connection
518 *  @param res - pointer to query results.  May point to NULL on entry
519 *  @param statement - the prepared statement to execute
520 *  @param random - Whether to support random-access to results
521 *  @param ... - varargs list of binary args
522 *  @return 0 for success or error code
523 */
524APU_DECLARE_NONSTD(int) apr_dbd_pvbselect(const apr_dbd_driver_t *driver,
525                                          apr_pool_t *pool, apr_dbd_t *handle,
526                                          apr_dbd_results_t **res,
527                                          apr_dbd_prepared_t *statement,
528                                          int random, ...);
529
530/** apr_dbd_datum_get: get a binary entry from a row
531 *
532 *  @param driver - the driver
533 *  @param row - row pointer
534 *  @param col - entry number
535 *  @param type - type of data to get
536 *  @param data - pointer to data, allocated by the caller
537 *  @return APR_SUCCESS on success, APR_ENOENT if data is NULL or APR_EGENERAL
538 */
539APU_DECLARE(apr_status_t) apr_dbd_datum_get(const apr_dbd_driver_t *driver,
540                                            apr_dbd_row_t *row, int col,
541                                            apr_dbd_type_e type, void *data);
542
543/** @} */
544
545#ifdef __cplusplus
546}
547#endif
548
549#endif
550