3 # Copyright (C) 2006 Jason Woofenden
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19 require_once(__DIR__.'/'.'encode.php');
20 require_once(__DIR__.'/'.'format.php');
22 # db_connect() -- connect to a mysql database
26 # database: the name of the database you want to connect to. Defaults to the
27 # second-to-last part of the domain name. eg for foo.example.com it would be
30 # user: username for connecting to the database. Defaults to
31 # $GLOBALS['db_username'] or (if that's not set) "www".
33 # password: password for connecting to the database. Defaults to
34 # $GLOBALS['db_password'] or (if that's not set "".
38 # the database connection handle. You'll only need this if you want to have
39 # multiple databases open at once.
41 function db_enc_sql($str) {
42 return mysql_real_escape_string($str, $GLOBALS['wfpl_db_handle'] ? $GLOBALS['wfpl_db_handle'] : null);
45 function db_connect($database = 'auto', $user = 'auto', $pass = 'auto', $host = 'localhost', $encoding = 'utf8') {
46 if($database == 'auto') {
47 if(isset($GLOBALS['db_name'])) {
48 $database = $GLOBALS['db_name'];
50 $host = $_SERVER['SERVER_NAME'];
51 $host = explode('.', $host);
53 $database = array_pop($host);
59 if(isset($GLOBALS['db_username'])) {
60 $user = $GLOBALS['db_username'];
67 if(isset($GLOBALS['db_password'])) {
68 $pass = $GLOBALS['db_password'];
74 $GLOBALS['wfpl_db_handle'] = mysql_connect($host, $user, $pass);
75 if(!$GLOBALS['wfpl_db_handle']) {
76 die('Could not connect to the database: ' . mysql_error());
79 mysql_set_charset($encoding, $GLOBALS['wfpl_db_handle']);
81 if(!mysql_select_db($database, $GLOBALS['wfpl_db_handle'])) {
82 die("Couldn not access database \"$database\": " . mysql_error($GLOBALS['wfpl_db_handle']));
85 return $GLOBALS['wfpl_db_handle'];
88 # Unless you're doing something unusual like an ALTER TABLE don't call this directly
89 function db_send_query($sql) {
90 #echo("Sending query: " . enc_html($sql) . "<br>\n");
91 $result = mysql_query($sql, $GLOBALS['wfpl_db_handle']);
93 die(enc_html('DATABASE ERROR: ' . mysql_error($GLOBALS['wfpl_db_handle']) . ' in the following query: ' . $sql));
99 # All select queries use this to generate the where clause, so they can work
100 # like printf. Currently three % codes are supported:
102 # %% put a % in the output
103 # %i put an integer in the output (strips non-numeric digits, and puts in 0 if blank)
104 # %f put a floating point value in the output (strips non-numeric digits, puts in 0.0 if not valid)
105 # %" output double quotes, surrounding the variable which is encoded to be in there.
106 # %s output encoded to be in double quotes, but don't output the quotes
107 # %$ output argument as-is, no encoding. Make sure you quote everything from the user!
109 # complex example: db_get_rows('mytable', 'id', 'where name=%" or company like "%%%s%%"', $name, $company_partial);
111 function db_printf($str) {
112 $args = func_get_args();
113 $args = array_slice($args, 1);
114 return _db_printf($str, $args);
117 # This function does the work, but takes the parameters in an array
118 function _db_printf($str, $args) {
121 $pos = strpos($str, '%');
122 if($pos === false) { # not found
126 # move everything up to (but not including) % to the output
127 $out .= substr($str, 0, $pos);
129 # grab the character after the %
130 $chr = substr($str, $pos + 1, 1);
132 # remove the stuff we've read from input
133 $str = substr($str, $pos + 2);
136 $out .= '"' . db_enc_sql(array_shift($args)) . '"';
137 } elseif($chr == 's') {
138 $out .= db_enc_sql(array_shift($args));
139 } elseif($chr == 'i') {
140 $int = format_int(array_shift($args));
141 if($int == '') $int = '0';
143 } elseif($chr == 'f') {
144 $arg = array_shift($args);
145 if(is_numeric($arg)) {
146 $arg = sprintf("%f", $arg);
148 $arg = format_decimal($arg);
149 if(strlen($arg) < 1) {
153 } elseif($chr == '$') {
154 $out .= array_shift($args);
164 function db_send_get($table, $columns, $where, $args) {
165 $sql = "SELECT $columns FROM $table";
167 $sql .= ' ' . _db_printf($where, $args);
170 return db_send_query($sql);
174 function db_get_rows($table, $columns, $where = '') {
175 $args = func_get_args();
176 $args = array_slice($args, 3);
177 $result = db_send_get($table, $columns, $where, $args);
180 while($row = mysql_fetch_row($result)) {
184 mysql_free_result($result);
189 # like db_get_rows, but return array of hashes.
190 function db_get_assocs($table, $columns, $where = '') {
191 $args = func_get_args();
192 $args = array_slice($args, 3);
193 $result = db_send_get($table, $columns, $where, $args);
196 while($row = mysql_fetch_assoc($result)) {
200 mysql_free_result($result);
205 function db_get_column($table, $columns, $where = '') {
206 $args = func_get_args();
207 $args = array_slice($args, 3);
208 $result = db_send_get($table, $columns, $where, $args);
211 while($row = mysql_fetch_row($result)) {
215 mysql_free_result($result);
220 function db_get_row($table, $columns, $where = '') {
221 $args = func_get_args();
222 $args = array_slice($args, 3);
223 $result = db_send_get($table, $columns, $where, $args);
225 $row = mysql_fetch_row($result);
227 mysql_free_result($result);
232 # like db_get_row, but return a hash.
233 function db_get_assoc($table, $columns, $where = '') {
234 $args = func_get_args();
235 $args = array_slice($args, 3);
236 $result = db_send_get($table, $columns, $where, $args);
238 $row = mysql_fetch_assoc($result);
240 mysql_free_result($result);
245 function db_get_value($table, $columns, $where = '') {
246 $args = func_get_args();
247 $args = array_slice($args, 3);
248 $result = db_send_get($table, $columns, $where, $args);
250 $value = mysql_fetch_row($result);
251 if($value !== false) {
255 mysql_free_result($result);
260 function db_count($table, $where = '') {
261 $args = func_get_args();
262 array_splice($args, 1, 0, array('count(*)'));
263 return call_user_func_array('db_get_value', $args);
266 # call either of these ways:
268 # db_insert('people', 'name,company', 'jason', 'widgets ltd');
270 # db_insert('people', 'name,company', array('jason', 'widgets ltd'));
271 function db_insert($table, $columns, $values) {
272 if(!is_array($values)) {
273 $values = func_get_args();
274 $values = array_slice($values, 2);
277 db_insert_ish('INSERT', $table, $columns, $values);
280 # like db_insert() above, but instead of passing columns and data separately,
281 # you can pass one array with the column names as keys and the data as values
282 function db_insert_assoc($table, $data) {
283 $args = func_get_args();
284 $args = array_slice($args, 2);
287 foreach($data as $key => $value) {
291 array_unshift($args, $table, join(',', $columns), $values);
292 call_user_func_array('db_insert', $args);
295 # same as above, except uses the "replace" command instead of "insert"
296 function db_replace($table, $columns, $values) {
297 if(!is_array($values)) {
298 $values = func_get_args();
299 $values = array_slice($values, 2);
302 db_insert_ish('REPLACE', $table, $columns, $values);
305 # return the value mysql made up for the auto_increment field (for the last insert)
306 function db_auto_id() {
307 return mysql_insert_id($GLOBALS['wfpl_db_handle']);
311 # used to implement db_insert() and db_replace()
312 function db_insert_ish($command, $table, $columns, $values) {
315 foreach($values as $value) {
316 if($sql) $sql .= ',';
317 $sql .= '"' . db_enc_sql($value) . '"';
320 $sql = "$command INTO $table ($columns) values($sql)";
325 # to be consistent with the syntax of the other db functions, $values can be an
326 # array, a single value, or multiple parameters.
328 # as usual the where clause stuff is optional, but it will of course update the
329 # whole table if you leave it off.
333 # # name everybody Bruce
334 # db_update('users', 'name', 'Bruce');
336 # # name user #6 Bruce
337 # db_update('users', 'name', 'Bruce', 'where id=%i', 6);
339 # # update the whole bit for user #6
340 # db_update('users', 'name,email,description', 'Bruce', 'bruce@example.com', 'is a cool guy', 'where id=%i', 6);
342 # # update the whole bit for user #6 (passing data as an array)
343 # $data = array('Bruce', 'bruce@example.com', 'is a cool guy');
344 # db_update('users', 'name,email,description', $data, 'where id=%i', 6);
346 # The prototype is really something like this:
347 # db_update(table, columns, values..., where(optional), where_args...(optional))
348 function db_update($table, $columns, $values) {
349 $args = func_get_args();
350 $args = array_slice($args, 2);
351 $columns = explode(',', $columns);
352 $num_fields = count($columns);
354 if(is_array($values)) {
355 $values = array_values($values);
356 $args = array_slice($args, 1);
358 $values = array_slice($args, 0, $num_fields);
359 $args = array_slice($args, $num_fields);
363 for($i = 0; $i < $num_fields; ++$i) {
367 $sql .= $columns[$i] . ' = "' . db_enc_sql($values[$i]) . '"';
371 $sql = "UPDATE $table SET $sql";
373 # if there's any more arguments
376 $args = array_slice($args, 1);
379 # any left for printf arguments?
381 $sql .= _db_printf($where, $args);
391 # like db_update() above, but instead of passing columns and data separately,
392 # you can pass one array with the column names as keys and the data as values
393 function db_update_assoc($table, $data) {
394 $args = func_get_args();
395 $args = array_slice($args, 2);
398 foreach($data as $key => $value) {
402 array_unshift($args, $values);
403 array_unshift($args, join(',', $columns));
404 array_unshift($args, $table);
405 call_user_func_array('db_update', $args);
408 # pass args for printf-style where clause as usual
409 function db_delete($table, $where = '') {
410 $sql = "DELETE FROM $table";
413 $args = func_get_args();
414 $args = array_slice($args, 2);
416 $sql .= _db_printf($where, $args);
426 define('DB_ORD_MAX', 2000000000);
428 function db_reposition_respace($table, $field, $where = '') {
430 $andand = " && ($where) ";
432 $ids = db_get_column($table, 'id', "where $field != 0 $andand order by $field");
435 # should never happen
438 $inc = floor(DB_ORD_MAX / ($c + 1));
440 foreach($ids as $id) {
441 db_update($table, $field, $cur, 'where id=%i', $id);
446 # this function facilitates letting the user manually sort records (with (int) $field != 0)
448 # When editing a particular row, give the user a pulldown, with 0 -> first, 1 -> second, etc, and pass this integer to db_reposition (3rd parameter). The value "ignored" can be passed, and the row will be given a sort value of 0 and ignored for all sorting.
450 # $pretty is used in error messages to refer to the row, it defaults to whatever you pass for $table.
452 # return value is the "ord" value you should set/insert into your database
454 function db_reposition($table, $row_id, $new_pos, $field = 'ord', $pretty = 'same as $table', $where = '', $renumbered_already = false) {
455 if($pretty == 'same as $table') {
459 $andand = " && ($where) ";
462 if($new_pos === 'ignored') {
467 # strategy: calculate $prev_ord and $next_ord. If there's no space between, renumber and recurse
468 if($new_pos == '0') {
469 $row = db_get_row($table, "id,$field", "where $field != 0 $andand order by $field limit 1");
471 list($first_row_id, $first_row_ord) = $row;
472 if($first_row_id == $row_id) {
474 return $first_row_ord;
476 $next_ord = $first_row_ord;
478 # this is the only row, put it in the middle
479 return '' + floor(DB_ORD_MAX / 2);
484 $new_pos = format_int_0($new_pos);
485 $rows = db_get_rows($table, "id,$field", "where $field != 0 $andand order by $field limit %i,2", $new_pos - 1);
487 message("Sorry, couldn't find the $pretty you asked to put this $pretty after. Putting it first instead.");
488 return db_reposition($table, $row_id, '0', $field, $pretty, $where);
490 list($prev_id, $prev_ord) = $rows[0];
491 if($prev_id == $row_id) {
492 # after self? this shouldn't happen
495 if(count($rows) == 1) {
497 $next_ord = DB_ORD_MAX;
499 list($next_id, $next_ord) = $rows[1];
500 if($next_id == $row_id) {
501 # after prev (already there)
507 if($prev_ord + 1 == $next_ord || $prev_ord == $next_ord) { # the latter should never happen
508 if($renumbered_already) {
509 message("Programmer error in $pretty ordering code. Please tell your website administrator.");
510 return '' . rand(2, DB_ORD_MAX - 2); # reasonably unlikely to be the same as some other ord
512 db_reposition_respace($table, $field, $where);
513 return db_reposition($table, $row_id, $new_pos, $field, $pretty, $where, $renumbered_already = true);
515 return $prev_ord + round(($next_ord - $prev_ord) / 2);