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1 | | <?php |
2 | | // $Id: database.mysql-common.inc,v 1.18 2008/02/08 03:24:05 dries Exp $ |
3 | |
|
4 | | /** |
5 | | * @file |
6 | | * Functions shared between mysql and mysqli database engines. |
7 | | */ |
8 | |
|
9 | | /** |
10 | | * Runs a basic query in the active database. |
11 | | * |
12 | | * User-supplied arguments to the query should be passed in as separate |
13 | | * parameters so that they can be properly escaped to avoid SQL injection |
14 | | * attacks. |
15 | | * |
16 | | * @param $query |
17 | | * A string containing an SQL query. |
18 | | * @param ... |
19 | | * A variable number of arguments which are substituted into the query |
20 | | * using printf() syntax. Instead of a variable number of query arguments, |
21 | | * you may also pass a single array containing the query arguments. |
22 | | * |
23 | | * Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose |
24 | | * in '') and %%. |
25 | | * |
26 | | * NOTE: using this syntax will cast NULL and FALSE values to decimal 0, |
27 | | * and TRUE values to decimal 1. |
28 | | * |
29 | | * @return |
30 | | * A database query result resource, or FALSE if the query was not |
31 | | * executed correctly. |
32 | | */ |
33 | | function db_query($query) { |
34 | 1 | $args = func_get_args(); |
35 | 1 | array_shift($args); |
36 | 1 | $query = db_prefix_tables($query); |
37 | 1 | if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax |
38 | 1 | $args = $args[0]; |
39 | | } |
40 | 1 | _db_query_callback($args, TRUE); |
41 | 1 | $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query); |
42 | 1 | return _db_query($query); |
43 | | } |
44 | |
|
45 | | /** |
46 | | * @ingroup schemaapi |
47 | | * @{ |
48 | | */ |
49 | |
|
50 | | /** |
51 | | * Generate SQL to create a new table from a Drupal schema definition. |
52 | | * |
53 | | * @param $name |
54 | | * The name of the table to create. |
55 | | * @param $table |
56 | | * A Schema API table definition array. |
57 | | * @return |
58 | | * An array of SQL statements to create the table. |
59 | | */ |
60 | | function db_create_table_sql($name, $table) { |
61 | |
|
62 | 1 | if (empty($table['mysql_suffix'])) { |
63 | 1 | $table['mysql_suffix'] = "/*!40100 DEFAULT CHARACTER SET UTF8 */"; |
64 | | } |
65 | |
|
66 | 1 | $sql = "CREATE TABLE {". $name ."} (\n"; |
67 | |
|
68 | | // Add the SQL statement for each field. |
69 | 1 | foreach ($table['fields'] as $field_name => $field) { |
70 | 1 | $sql .= _db_create_field_sql($field_name, _db_process_field($field)) .", \n"; |
71 | | } |
72 | |
|
73 | | // Process keys & indexes. |
74 | 1 | $keys = _db_create_keys_sql($table); |
75 | 1 | if (count($keys)) { |
76 | 1 | $sql .= implode(", \n", $keys) .", \n"; |
77 | | } |
78 | |
|
79 | | // Remove the last comma and space. |
80 | 1 | $sql = substr($sql, 0, -3) ."\n) "; |
81 | |
|
82 | 1 | $sql .= $table['mysql_suffix']; |
83 | |
|
84 | 1 | return array($sql); |
85 | | } |
86 | |
|
87 | | function _db_create_keys_sql($spec) { |
88 | | $keys = array(); |
89 | |
|
90 | 1 | if (!empty($spec['primary key'])) { |
91 | 1 | $keys[] = 'PRIMARY KEY ('. _db_create_key_sql($spec['primary key']) .')'; |
92 | | } |
93 | 1 | if (!empty($spec['unique keys'])) { |
94 | 1 | foreach ($spec['unique keys'] as $key => $fields) { |
95 | 1 | $keys[] = 'UNIQUE KEY '. $key .' ('. _db_create_key_sql($fields) .')'; |
96 | | } |
97 | | } |
98 | 1 | if (!empty($spec['indexes'])) { |
99 | 1 | foreach ($spec['indexes'] as $index => $fields) { |
100 | 1 | $keys[] = 'INDEX '. $index .' ('. _db_create_key_sql($fields) .')'; |
101 | | } |
102 | | } |
103 | |
|
104 | 1 | return $keys; |
105 | | } |
106 | |
|
107 | | function _db_create_key_sql($fields) { |
108 | | $ret = array(); |
109 | 1 | foreach ($fields as $field) { |
110 | 1 | if (is_array($field)) { |
111 | 1 | $ret[] = $field[0] .'('. $field[1] .')'; |
112 | | } |
113 | | else { |
114 | 1 | $ret[] = $field; |
115 | | } |
116 | | } |
117 | 1 | return implode(', ', $ret); |
118 | | } |
119 | |
|
120 | | /** |
121 | | * Set database-engine specific properties for a field. |
122 | | * |
123 | | * @param $field |
124 | | * A field description array, as specified in the schema documentation. |
125 | | */ |
126 | | function _db_process_field($field) { |
127 | |
|
128 | 1 | if (!isset($field['size'])) { |
129 | 1 | $field['size'] = 'normal'; |
130 | | } |
131 | |
|
132 | | // Set the correct database-engine specific datatype. |
133 | 1 | if (!isset($field['mysql_type'])) { |
134 | 1 | $map = db_type_map(); |
135 | 1 | $field['mysql_type'] = $map[$field['type'] .':'. $field['size']]; |
136 | | } |
137 | |
|
138 | 1 | if ($field['type'] == 'serial') { |
139 | 1 | $field['auto_increment'] = TRUE; |
140 | | } |
141 | |
|
142 | 1 | return $field; |
143 | | } |
144 | |
|
145 | | /** |
146 | | * Create an SQL string for a field to be used in table creation or alteration. |
147 | | * |
148 | | * Before passing a field out of a schema definition into this function it has |
149 | | * to be processed by _db_process_field(). |
150 | | * |
151 | | * @param $name |
152 | | * Name of the field. |
153 | | * @param $spec |
154 | | * The field specification, as per the schema data structure format. |
155 | | */ |
156 | | function _db_create_field_sql($name, $spec) { |
157 | 1 | $sql = "`". $name ."` ". $spec['mysql_type']; |
158 | |
|
159 | 1 | if (isset($spec['length'])) { |
160 | 1 | $sql .= '('. $spec['length'] .')'; |
161 | | } |
162 | 1 | elseif (isset($spec['precision']) && isset($spec['scale'])) { |
163 | | $sql .= '('. $spec['precision'] .', '. $spec['scale'] .')'; |
164 | | } |
165 | |
|
166 | 1 | if (!empty($spec['unsigned'])) { |
167 | 1 | $sql .= ' unsigned'; |
168 | | } |
169 | |
|
170 | 1 | if (!empty($spec['not null'])) { |
171 | 1 | $sql .= ' NOT NULL'; |
172 | | } |
173 | |
|
174 | 1 | if (!empty($spec['auto_increment'])) { |
175 | 1 | $sql .= ' auto_increment'; |
176 | | } |
177 | |
|
178 | 1 | if (isset($spec['default'])) { |
179 | 1 | if (is_string($spec['default'])) { |
180 | 1 | $spec['default'] = "'". $spec['default'] ."'"; |
181 | | } |
182 | 1 | $sql .= ' DEFAULT '. $spec['default']; |
183 | | } |
184 | |
|
185 | 1 | if (empty($spec['not null']) && !isset($spec['default'])) { |
186 | 1 | $sql .= ' DEFAULT NULL'; |
187 | | } |
188 | |
|
189 | 1 | return $sql; |
190 | | } |
191 | |
|
192 | | /** |
193 | | * This maps a generic data type in combination with its data size |
194 | | * to the engine-specific data type. |
195 | | */ |
196 | | function db_type_map() { |
197 | | // Put :normal last so it gets preserved by array_flip. This makes |
198 | | // it much easier for modules (such as schema.module) to map |
199 | | // database types back into schema types. |
200 | | $map = array( |
201 | 1 | 'varchar:normal' => 'VARCHAR', |
202 | | 'char:normal' => 'CHAR', |
203 | |
|
204 | 1 | 'text:tiny' => 'TINYTEXT', |
205 | | 'text:small' => 'TINYTEXT', |
206 | | 'text:medium' => 'MEDIUMTEXT', |
207 | | 'text:big' => 'LONGTEXT', |
208 | | 'text:normal' => 'TEXT', |
209 | |
|
210 | 1 | 'serial:tiny' => 'TINYINT', |
211 | | 'serial:small' => 'SMALLINT', |
212 | | 'serial:medium' => 'MEDIUMINT', |
213 | | 'serial:big' => 'BIGINT', |
214 | | 'serial:normal' => 'INT', |
215 | |
|
216 | 1 | 'int:tiny' => 'TINYINT', |
217 | | 'int:small' => 'SMALLINT', |
218 | | 'int:medium' => 'MEDIUMINT', |
219 | | 'int:big' => 'BIGINT', |
220 | | 'int:normal' => 'INT', |
221 | |
|
222 | 1 | 'float:tiny' => 'FLOAT', |
223 | | 'float:small' => 'FLOAT', |
224 | | 'float:medium' => 'FLOAT', |
225 | | 'float:big' => 'DOUBLE', |
226 | | 'float:normal' => 'FLOAT', |
227 | |
|
228 | 1 | 'numeric:normal' => 'DECIMAL', |
229 | |
|
230 | 1 | 'blob:big' => 'LONGBLOB', |
231 | | 'blob:normal' => 'BLOB', |
232 | |
|
233 | 1 | 'datetime:normal' => 'DATETIME', |
234 | | ); |
235 | 1 | return $map; |
236 | | } |
237 | |
|
238 | | /** |
239 | | * Rename a table. |
240 | | * |
241 | | * @param $ret |
242 | | * Array to which query results will be added. |
243 | | * @param $table |
244 | | * The table to be renamed. |
245 | | * @param $new_name |
246 | | * The new name for the table. |
247 | | */ |
248 | | function db_rename_table(&$ret, $table, $new_name) { |
249 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} RENAME TO {'. $new_name .'}'); |
250 | | } |
251 | |
|
252 | | /** |
253 | | * Drop a table. |
254 | | * |
255 | | * @param $ret |
256 | | * Array to which query results will be added. |
257 | | * @param $table |
258 | | * The table to be dropped. |
259 | | */ |
260 | | function db_drop_table(&$ret, $table) { |
261 | 1 | $ret[] = update_sql('DROP TABLE {'. $table .'}'); |
262 | | } |
263 | |
|
264 | | /** |
265 | | * Add a new field to a table. |
266 | | * |
267 | | * @param $ret |
268 | | * Array to which query results will be added. |
269 | | * @param $table |
270 | | * Name of the table to be altered. |
271 | | * @param $field |
272 | | * Name of the field to be added. |
273 | | * @param $spec |
274 | | * The field specification array, as taken from a schema definition. |
275 | | * The specification may also contain the key 'initial', the newly |
276 | | * created field will be set to the value of the key in all rows. |
277 | | * This is most useful for creating NOT NULL columns with no default |
278 | | * value in existing tables. |
279 | | * @param $keys_new |
280 | | * Optional keys and indexes specification to be created on the |
281 | | * table along with adding the field. The format is the same as a |
282 | | * table specification but without the 'fields' element. If you are |
283 | | * adding a type 'serial' field, you MUST specify at least one key |
284 | | * or index including it in this array. @see db_change_field for more |
285 | | * explanation why. |
286 | | */ |
287 | | function db_add_field(&$ret, $table, $field, $spec, $keys_new = array()) { |
288 | | $fixnull = FALSE; |
289 | | if (!empty($spec['not null']) && !isset($spec['default'])) { |
290 | | $fixnull = TRUE; |
291 | | $spec['not null'] = FALSE; |
292 | | } |
293 | | $query = 'ALTER TABLE {'. $table .'} ADD '; |
294 | | $query .= _db_create_field_sql($field, _db_process_field($spec)); |
295 | | if (count($keys_new)) { |
296 | | $query .= ', ADD '. implode(', ADD ', _db_create_keys_sql($keys_new)); |
297 | | } |
298 | | $ret[] = update_sql($query); |
299 | | if (isset($spec['initial'])) { |
300 | | // All this because update_sql does not support %-placeholders. |
301 | | $sql = 'UPDATE {'. $table .'} SET '. $field .' = '. db_type_placeholder($spec['type']); |
302 | | $result = db_query($sql, $spec['initial']); |
303 | | $ret[] = array('success' => $result !== FALSE, 'query' => check_plain($sql .' ('. $spec['initial'] .')')); |
304 | | } |
305 | | if ($fixnull) { |
306 | | $spec['not null'] = TRUE; |
307 | | db_change_field($ret, $table, $field, $field, $spec); |
308 | | } |
309 | | } |
310 | |
|
311 | | /** |
312 | | * Drop a field. |
313 | | * |
314 | | * @param $ret |
315 | | * Array to which query results will be added. |
316 | | * @param $table |
317 | | * The table to be altered. |
318 | | * @param $field |
319 | | * The field to be dropped. |
320 | | */ |
321 | | function db_drop_field(&$ret, $table, $field) { |
322 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP '. $field); |
323 | | } |
324 | |
|
325 | | /** |
326 | | * Set the default value for a field. |
327 | | * |
328 | | * @param $ret |
329 | | * Array to which query results will be added. |
330 | | * @param $table |
331 | | * The table to be altered. |
332 | | * @param $field |
333 | | * The field to be altered. |
334 | | * @param $default |
335 | | * Default value to be set. NULL for 'default NULL'. |
336 | | */ |
337 | | function db_field_set_default(&$ret, $table, $field, $default) { |
338 | | if ($default == NULL) { |
339 | | $default = 'NULL'; |
340 | | } |
341 | | else { |
342 | | $default = is_string($default) ? "'$default'" : $default; |
343 | | } |
344 | |
|
345 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' SET DEFAULT '. $default); |
346 | | } |
347 | |
|
348 | | /** |
349 | | * Set a field to have no default value. |
350 | | * |
351 | | * @param $ret |
352 | | * Array to which query results will be added. |
353 | | * @param $table |
354 | | * The table to be altered. |
355 | | * @param $field |
356 | | * The field to be altered. |
357 | | */ |
358 | | function db_field_set_no_default(&$ret, $table, $field) { |
359 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' DROP DEFAULT'); |
360 | | } |
361 | |
|
362 | | /** |
363 | | * Add a primary key. |
364 | | * |
365 | | * @param $ret |
366 | | * Array to which query results will be added. |
367 | | * @param $table |
368 | | * The table to be altered. |
369 | | * @param $fields |
370 | | * Fields for the primary key. |
371 | | */ |
372 | | function db_add_primary_key(&$ret, $table, $fields) { |
373 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD PRIMARY KEY ('. |
374 | | _db_create_key_sql($fields) .')'); |
375 | | } |
376 | |
|
377 | | /** |
378 | | * Drop the primary key. |
379 | | * |
380 | | * @param $ret |
381 | | * Array to which query results will be added. |
382 | | * @param $table |
383 | | * The table to be altered. |
384 | | */ |
385 | | function db_drop_primary_key(&$ret, $table) { |
386 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP PRIMARY KEY'); |
387 | | } |
388 | |
|
389 | | /** |
390 | | * Add a unique key. |
391 | | * |
392 | | * @param $ret |
393 | | * Array to which query results will be added. |
394 | | * @param $table |
395 | | * The table to be altered. |
396 | | * @param $name |
397 | | * The name of the key. |
398 | | * @param $fields |
399 | | * An array of field names. |
400 | | */ |
401 | | function db_add_unique_key(&$ret, $table, $name, $fields) { |
402 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD UNIQUE KEY '. |
403 | | $name .' ('. _db_create_key_sql($fields) .')'); |
404 | | } |
405 | |
|
406 | | /** |
407 | | * Drop a unique key. |
408 | | * |
409 | | * @param $ret |
410 | | * Array to which query results will be added. |
411 | | * @param $table |
412 | | * The table to be altered. |
413 | | * @param $name |
414 | | * The name of the key. |
415 | | */ |
416 | | function db_drop_unique_key(&$ret, $table, $name) { |
417 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP KEY '. $name); |
418 | | } |
419 | |
|
420 | | /** |
421 | | * Add an index. |
422 | | * |
423 | | * @param $ret |
424 | | * Array to which query results will be added. |
425 | | * @param $table |
426 | | * The table to be altered. |
427 | | * @param $name |
428 | | * The name of the index. |
429 | | * @param $fields |
430 | | * An array of field names. |
431 | | */ |
432 | | function db_add_index(&$ret, $table, $name, $fields) { |
433 | | $query = 'ALTER TABLE {'. $table .'} ADD INDEX '. $name .' ('. _db_create_key_sql($fields) .')'; |
434 | | $ret[] = update_sql($query); |
435 | | } |
436 | |
|
437 | | /** |
438 | | * Drop an index. |
439 | | * |
440 | | * @param $ret |
441 | | * Array to which query results will be added. |
442 | | * @param $table |
443 | | * The table to be altered. |
444 | | * @param $name |
445 | | * The name of the index. |
446 | | */ |
447 | | function db_drop_index(&$ret, $table, $name) { |
448 | | $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP INDEX '. $name); |
449 | | } |
450 | |
|
451 | | /** |
452 | | * Change a field definition. |
453 | | * |
454 | | * IMPORTANT NOTE: To maintain database portability, you have to explicitly |
455 | | * recreate all indices and primary keys that are using the changed field. |
456 | | * |
457 | | * That means that you have to drop all affected keys and indexes with |
458 | | * db_drop_{primary_key,unique_key,index}() before calling db_change_field(). |
459 | | * To recreate the keys and indices, pass the key definitions as the |
460 | | * optional $keys_new argument directly to db_change_field(). |
461 | | * |
462 | | * For example, suppose you have: |
463 | | * @code |
464 | | * $schema['foo'] = array( |
465 | | * 'fields' => array( |
466 | | * 'bar' => array('type' => 'int', 'not null' => TRUE) |
467 | | * ), |
468 | | * 'primary key' => array('bar') |
469 | | * ); |
470 | | * @endcode |
471 | | * and you want to change foo.bar to be type serial, leaving it as the |
472 | | * primary key. The correct sequence is: |
473 | | * @code |
474 | | * db_drop_primary_key($ret, 'foo'); |
475 | | * db_change_field($ret, 'foo', 'bar', 'bar', |
476 | | * array('type' => 'serial', 'not null' => TRUE), |
477 | | * array('primary key' => array('bar'))); |
478 | | * @endcode |
479 | | * |
480 | | * The reasons for this are due to the different database engines: |
481 | | * |
482 | | * On PostgreSQL, changing a field definition involves adding a new field |
483 | | * and dropping an old one which* causes any indices, primary keys and |
484 | | * sequences (from serial-type fields) that use the changed field to be dropped. |
485 | | * |
486 | | * On MySQL, all type 'serial' fields must be part of at least one key |
487 | | * or index as soon as they are created. You cannot use |
488 | | * db_add_{primary_key,unique_key,index}() for this purpose because |
489 | | * the ALTER TABLE command will fail to add the column without a key |
490 | | * or index specification. The solution is to use the optional |
491 | | * $keys_new argument to create the key or index at the same time as |
492 | | * field. |
493 | | * |
494 | | * You could use db_add_{primary_key,unique_key,index}() in all cases |
495 | | * unless you are converting a field to be type serial. You can use |
496 | | * the $keys_new argument in all cases. |
497 | | * |
498 | | * @param $ret |
499 | | * Array to which query results will be added. |
500 | | * @param $table |
501 | | * Name of the table. |
502 | | * @param $field |
503 | | * Name of the field to change. |
504 | | * @param $field_new |
505 | | * New name for the field (set to the same as $field if you don't want to change the name). |
506 | | * @param $spec |
507 | | * The field specification for the new field. |
508 | | * @param $keys_new |
509 | | * Optional keys and indexes specification to be created on the |
510 | | * table along with changing the field. The format is the same as a |
511 | | * table specification but without the 'fields' element. |
512 | | */ |
513 | |
|
514 | | function db_change_field(&$ret, $table, $field, $field_new, $spec, $keys_new = array()) { |
515 | | $sql = 'ALTER TABLE {'. $table .'} CHANGE '. $field .' '. |
516 | | _db_create_field_sql($field_new, _db_process_field($spec)); |
517 | | if (count($keys_new)) { |
518 | | $sql .= ', ADD '. implode(', ADD ', _db_create_keys_sql($keys_new)); |
519 | | } |
520 | | $ret[] = update_sql($sql); |
521 | | } |
522 | |
|
523 | | /** |
524 | | * Returns the last insert id. |
525 | | * |
526 | | * @param $table |
527 | | * The name of the table you inserted into. |
528 | | * @param $field |
529 | | * The name of the autoincrement field. |
530 | | */ |
531 | | function db_last_insert_id($table, $field) { |
532 | 1 | return db_result(db_query('SELECT LAST_INSERT_ID()')); |
533 | | } |