3 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
6 * The PEAR DB driver for PHP's mysql extension
7 * for interacting with MySQL databases
11 * LICENSE: This source file is subject to version 3.0 of the PHP license
12 * that is available through the world-wide-web at the following URI:
13 * http://www.php.net/license/3_0.txt. If you did not receive a copy of
14 * the PHP License and are unable to obtain it through the web, please
15 * send a note to license@php.net so we can mail you a copy immediately.
19 * @author Stig Bakken <ssb@php.net>
20 * @author Daniel Convissor <danielc@php.net>
21 * @copyright 1997-2007 The PHP Group
22 * @license http://www.php.net/license/3_0.txt PHP License 3.0
24 * @link http://pear.php.net/package/DB
28 * Obtain the DB_common class so it can be extended from
30 require_once 'DB/common.php';
33 * The methods PEAR DB uses to interact with PHP's mysql extension
34 * for interacting with MySQL databases
36 * These methods overload the ones declared in DB_common.
40 * @author Stig Bakken <ssb@php.net>
41 * @author Daniel Convissor <danielc@php.net>
42 * @copyright 1997-2007 The PHP Group
43 * @license http://www.php.net/license/3_0.txt PHP License 3.0
44 * @version Release: 1.9.2
45 * @link http://pear.php.net/package/DB
47 class DB_mysql extends DB_common
52 * The DB driver type (mysql, oci8, odbc, etc.)
55 var $phptype = 'mysql';
58 * The database syntax variant to be used (db2, access, etc.), if any
61 var $dbsyntax = 'mysql';
64 * The capabilities of this DB implementation
66 * The 'new_link' element contains the PHP version that first provided
67 * new_link support for this DBMS. Contains false if it's unsupported.
69 * Meaning of the 'limit' element:
70 * + 'emulate' = emulate with fetch row by number
71 * + 'alter' = alter the query
76 var $features = array(
78 'new_link' => '4.2.0',
83 'transactions' => true,
87 * A mapping of native error codes to DB error codes
90 var $errorcode_map = array(
91 1004 => DB_ERROR_CANNOT_CREATE,
92 1005 => DB_ERROR_CANNOT_CREATE,
93 1006 => DB_ERROR_CANNOT_CREATE,
94 1007 => DB_ERROR_ALREADY_EXISTS,
95 1008 => DB_ERROR_CANNOT_DROP,
96 1022 => DB_ERROR_ALREADY_EXISTS,
97 1044 => DB_ERROR_ACCESS_VIOLATION,
98 1046 => DB_ERROR_NODBSELECTED,
99 1048 => DB_ERROR_CONSTRAINT,
100 1049 => DB_ERROR_NOSUCHDB,
101 1050 => DB_ERROR_ALREADY_EXISTS,
102 1051 => DB_ERROR_NOSUCHTABLE,
103 1054 => DB_ERROR_NOSUCHFIELD,
104 1061 => DB_ERROR_ALREADY_EXISTS,
105 1062 => DB_ERROR_ALREADY_EXISTS,
106 1064 => DB_ERROR_SYNTAX,
107 1091 => DB_ERROR_NOT_FOUND,
108 1100 => DB_ERROR_NOT_LOCKED,
109 1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
110 1142 => DB_ERROR_ACCESS_VIOLATION,
111 1146 => DB_ERROR_NOSUCHTABLE,
112 1216 => DB_ERROR_CONSTRAINT,
113 1217 => DB_ERROR_CONSTRAINT,
114 1356 => DB_ERROR_DIVZERO,
115 1451 => DB_ERROR_CONSTRAINT,
116 1452 => DB_ERROR_CONSTRAINT,
120 * The raw database connection created by PHP
126 * The DSN information for connecting to a database
133 * Should data manipulation queries be committed automatically?
137 var $autocommit = true;
140 * The quantity of transactions begun
142 * {@internal While this is private, it can't actually be designated
143 * private in PHP 5 because it is directly accessed in the test suite.}}
148 var $transaction_opcount = 0;
151 * The database specified in the DSN
153 * It's a fix to allow calls to different databases in the same script.
165 * This constructor calls <kbd>parent::__construct()</kbd>
169 function __construct()
171 parent::__construct();
178 * Connect to the database server, log in and open the database
180 * Don't call this method directly. Use DB::connect() instead.
182 * PEAR DB's mysql driver supports the following extra DSN options:
183 * + new_link If set to true, causes subsequent calls to connect()
184 * to return a new connection link instead of the
185 * existing one. WARNING: this is not portable to
186 * other DBMS's. Available since PEAR DB 1.7.0.
187 * + client_flags Any combination of MYSQL_CLIENT_* constants.
188 * Only used if PHP is at version 4.3.0 or greater.
189 * Available since PEAR DB 1.7.0.
191 * @param array $dsn the data source name
192 * @param bool $persistent should the connection be persistent?
194 * @return int DB_OK on success. A DB_Error object on failure.
196 function connect($dsn, $persistent = false)
198 if (!PEAR::loadExtension('mysql')) {
199 return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
203 if ($dsn['dbsyntax']) {
204 $this->dbsyntax = $dsn['dbsyntax'];
208 if ($dsn['protocol'] && $dsn['protocol'] == 'unix') {
209 $params[0] = ':' . $dsn['socket'];
211 $params[0] = $dsn['hostspec'] ? $dsn['hostspec']
214 $params[0] .= ':' . $dsn['port'];
217 $params[] = $dsn['username'] ? $dsn['username'] : null;
218 $params[] = $dsn['password'] ? $dsn['password'] : null;
221 if (isset($dsn['new_link'])
222 && ($dsn['new_link'] == 'true' || $dsn['new_link'] === true))
229 if (version_compare(phpversion(), '4.3.0', '>=')) {
230 $params[] = isset($dsn['client_flags'])
231 ? $dsn['client_flags'] : null;
234 $connect_function = $persistent ? 'mysql_pconnect' : 'mysql_connect';
236 $ini = ini_get('track_errors');
239 $this->connection = @call_user_func_array($connect_function,
242 @ini_set('track_errors', 1);
243 $this->connection = @call_user_func_array($connect_function,
245 @ini_set('track_errors', $ini);
248 if (!$this->connection) {
249 if (($err = @mysql_error()) != '') {
250 return $this->raiseError(DB_ERROR_CONNECT_FAILED,
254 return $this->raiseError(DB_ERROR_CONNECT_FAILED,
260 if ($dsn['database']) {
261 if (!@mysql_select_db($dsn['database'], $this->connection)) {
262 return $this->mysqlRaiseError();
264 $this->_db = $dsn['database'];
274 * Disconnects from the database server
276 * @return bool TRUE on success, FALSE on failure
278 function disconnect()
280 $ret = @mysql_close($this->connection);
281 $this->connection = null;
289 * Sends a query to the database server
291 * Generally uses mysql_query(). If you want to use
292 * mysql_unbuffered_query() set the "result_buffering" option to 0 using
293 * setOptions(). This option was added in Release 1.7.0.
295 * @param string the SQL query string
297 * @return mixed + a PHP result resrouce for successful SELECT queries
298 * + the DB_OK constant for other successful queries
299 * + a DB_Error object on failure
301 function simpleQuery($query)
303 $ismanip = $this->_checkManip($query);
304 $this->last_query = $query;
305 $query = $this->modifyQuery($query);
307 if (!@mysql_select_db($this->_db, $this->connection)) {
308 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
311 if (!$this->autocommit && $ismanip) {
312 if ($this->transaction_opcount == 0) {
313 $result = @mysql_query('SET AUTOCOMMIT=0', $this->connection);
314 $result = @mysql_query('BEGIN', $this->connection);
316 return $this->mysqlRaiseError();
319 $this->transaction_opcount++;
321 if (!$this->options['result_buffering']) {
322 $result = @mysql_unbuffered_query($query, $this->connection);
324 $result = @mysql_query($query, $this->connection);
327 return $this->mysqlRaiseError();
329 if (is_resource($result)) {
339 * Move the internal mysql result pointer to the next available result
341 * This method has not been implemented yet.
343 * @param a valid sql result resource
347 function nextResult($result)
356 * Places a row from the result set into the given array
358 * Formating of the array and the data therein are configurable.
359 * See DB_result::fetchInto() for more information.
361 * This method is not meant to be called directly. Use
362 * DB_result::fetchInto() instead. It can't be declared "protected"
363 * because DB_result is a separate object.
365 * @param resource $result the query result resource
366 * @param array $arr the referenced array to put the data in
367 * @param int $fetchmode how the resulting array should be indexed
368 * @param int $rownum the row number to fetch (0 = first row)
370 * @return mixed DB_OK on success, NULL when the end of a result set is
371 * reached or on failure
373 * @see DB_result::fetchInto()
375 function fetchInto($result, &$arr, $fetchmode, $rownum = null)
377 if ($rownum !== null) {
378 if (!@mysql_data_seek($result, $rownum)) {
382 if ($fetchmode & DB_FETCHMODE_ASSOC) {
383 $arr = @mysql_fetch_array($result, MYSQL_ASSOC);
384 if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
385 $arr = array_change_key_case($arr, CASE_LOWER);
388 $arr = @mysql_fetch_row($result);
393 if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
395 * Even though this DBMS already trims output, we do this because
396 * a field might have intentional whitespace at the end that
397 * gets removed by DB_PORTABILITY_RTRIM under another driver.
399 $this->_rtrimArrayValues($arr);
401 if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
402 $this->_convertNullArrayValuesToEmpty($arr);
411 * Deletes the result set and frees the memory occupied by the result set
413 * This method is not meant to be called directly. Use
414 * DB_result::free() instead. It can't be declared "protected"
415 * because DB_result is a separate object.
417 * @param resource $result PHP's query result resource
419 * @return bool TRUE on success, FALSE if $result is invalid
421 * @see DB_result::free()
423 function freeResult($result)
425 return is_resource($result) ? mysql_free_result($result) : false;
432 * Gets the number of columns in a result set
434 * This method is not meant to be called directly. Use
435 * DB_result::numCols() instead. It can't be declared "protected"
436 * because DB_result is a separate object.
438 * @param resource $result PHP's query result resource
440 * @return int the number of columns. A DB_Error object on failure.
442 * @see DB_result::numCols()
444 function numCols($result)
446 $cols = @mysql_num_fields($result);
448 return $this->mysqlRaiseError();
457 * Gets the number of rows in a result set
459 * This method is not meant to be called directly. Use
460 * DB_result::numRows() instead. It can't be declared "protected"
461 * because DB_result is a separate object.
463 * @param resource $result PHP's query result resource
465 * @return int the number of rows. A DB_Error object on failure.
467 * @see DB_result::numRows()
469 function numRows($result)
471 $rows = @mysql_num_rows($result);
472 if ($rows === null) {
473 return $this->mysqlRaiseError();
482 * Enables or disables automatic commits
484 * @param bool $onoff true turns it on, false turns it off
486 * @return int DB_OK on success. A DB_Error object if the driver
487 * doesn't support auto-committing transactions.
489 function autoCommit($onoff = false)
491 // XXX if $this->transaction_opcount > 0, we should probably
492 // issue a warning here.
493 $this->autocommit = $onoff ? true : false;
501 * Commits the current transaction
503 * @return int DB_OK on success. A DB_Error object on failure.
507 if ($this->transaction_opcount > 0) {
509 if (!@mysql_select_db($this->_db, $this->connection)) {
510 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
513 $result = @mysql_query('COMMIT', $this->connection);
514 $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
515 $this->transaction_opcount = 0;
517 return $this->mysqlRaiseError();
527 * Reverts the current transaction
529 * @return int DB_OK on success. A DB_Error object on failure.
533 if ($this->transaction_opcount > 0) {
535 if (!@mysql_select_db($this->_db, $this->connection)) {
536 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
539 $result = @mysql_query('ROLLBACK', $this->connection);
540 $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
541 $this->transaction_opcount = 0;
543 return $this->mysqlRaiseError();
550 // {{{ affectedRows()
553 * Determines the number of rows affected by a data maniuplation query
555 * 0 is returned for queries that don't manipulate data.
557 * @return int the number of rows. A DB_Error object on failure.
559 function affectedRows()
561 if ($this->_last_query_manip) {
562 return @mysql_affected_rows($this->connection);
572 * Returns the next free id in a sequence
574 * @param string $seq_name name of the sequence
575 * @param boolean $ondemand when true, the seqence is automatically
576 * created if it does not exist
578 * @return int the next id number in the sequence.
579 * A DB_Error object on failure.
581 * @see DB_common::nextID(), DB_common::getSequenceName(),
582 * DB_mysql::createSequence(), DB_mysql::dropSequence()
584 function nextId($seq_name, $ondemand = true)
586 $seqname = $this->getSequenceName($seq_name);
589 $this->pushErrorHandling(PEAR_ERROR_RETURN);
590 $result = $this->query("UPDATE ${seqname} ".
591 'SET id=LAST_INSERT_ID(id+1)');
592 $this->popErrorHandling();
593 if ($result === DB_OK) {
595 $id = @mysql_insert_id($this->connection);
600 // Sequence table must be empty for some reason, so fill
601 // it and return 1 and obtain a user-level lock
602 $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
603 if (DB::isError($result)) {
604 return $this->raiseError($result);
607 // Failed to get the lock
608 return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
611 // add the default value
612 $result = $this->query("REPLACE INTO ${seqname} (id) VALUES (0)");
613 if (DB::isError($result)) {
614 return $this->raiseError($result);
618 $result = $this->getOne('SELECT RELEASE_LOCK('
619 . "'${seqname}_lock')");
620 if (DB::isError($result)) {
621 return $this->raiseError($result);
623 // We know what the result will be, so no need to try again
626 } elseif ($ondemand && DB::isError($result) &&
627 $result->getCode() == DB_ERROR_NOSUCHTABLE)
629 // ONDEMAND TABLE CREATION
630 $result = $this->createSequence($seq_name);
631 if (DB::isError($result)) {
632 return $this->raiseError($result);
637 } elseif (DB::isError($result) &&
638 $result->getCode() == DB_ERROR_ALREADY_EXISTS)
641 // see _BCsequence() comment
642 $result = $this->_BCsequence($seqname);
643 if (DB::isError($result)) {
644 return $this->raiseError($result);
650 return $this->raiseError($result);
654 // {{{ createSequence()
657 * Creates a new sequence
659 * @param string $seq_name name of the new sequence
661 * @return int DB_OK on success. A DB_Error object on failure.
663 * @see DB_common::createSequence(), DB_common::getSequenceName(),
664 * DB_mysql::nextID(), DB_mysql::dropSequence()
666 function createSequence($seq_name)
668 $seqname = $this->getSequenceName($seq_name);
669 $res = $this->query('CREATE TABLE ' . $seqname
670 . ' (id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'
671 . ' PRIMARY KEY(id))');
672 if (DB::isError($res)) {
675 // insert yields value 1, nextId call will generate ID 2
676 $res = $this->query("INSERT INTO ${seqname} (id) VALUES (0)");
677 if (DB::isError($res)) {
681 return $this->query("UPDATE ${seqname} SET id = 0");
685 // {{{ dropSequence()
690 * @param string $seq_name name of the sequence to be deleted
692 * @return int DB_OK on success. A DB_Error object on failure.
694 * @see DB_common::dropSequence(), DB_common::getSequenceName(),
695 * DB_mysql::nextID(), DB_mysql::createSequence()
697 function dropSequence($seq_name)
699 return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
706 * Backwards compatibility with old sequence emulation implementation
707 * (clean up the dupes)
709 * @param string $seqname the sequence name to clean up
711 * @return bool true on success. A DB_Error object on failure.
715 function _BCsequence($seqname)
717 // Obtain a user-level lock... this will release any previous
718 // application locks, but unlike LOCK TABLES, it does not abort
719 // the current transaction and is much less frequently used.
720 $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
721 if (DB::isError($result)) {
725 // Failed to get the lock, can't do the conversion, bail
726 // with a DB_ERROR_NOT_LOCKED error
727 return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
730 $highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
731 if (DB::isError($highest_id)) {
734 // This should kill all rows except the highest
735 // We should probably do something if $highest_id isn't
736 // numeric, but I'm at a loss as how to handle that...
737 $result = $this->query('DELETE FROM ' . $seqname
738 . " WHERE id <> $highest_id");
739 if (DB::isError($result)) {
743 // If another thread has been waiting for this lock,
744 // it will go thru the above procedure, but will have no
746 $result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
747 if (DB::isError($result)) {
754 // {{{ quoteIdentifier()
757 * Quotes a string so it can be safely used as a table or column name
758 * (WARNING: using names that require this is a REALLY BAD IDEA)
760 * WARNING: Older versions of MySQL can't handle the backtick
761 * character (<kbd>`</kbd>) in table or column names.
763 * @param string $str identifier name to be quoted
765 * @return string quoted identifier string
767 * @see DB_common::quoteIdentifier()
768 * @since Method available since Release 1.6.0
770 function quoteIdentifier($str)
772 return '`' . str_replace('`', '``', $str) . '`';
776 // {{{ escapeSimple()
779 * Escapes a string according to the current DBMS's standards
781 * @param string $str the string to be escaped
783 * @return string the escaped string
785 * @see DB_common::quoteSmart()
786 * @since Method available since Release 1.6.0
788 function escapeSimple($str)
790 if (function_exists('mysql_real_escape_string')) {
791 return @mysql_real_escape_string($str, $this->connection);
793 return @mysql_escape_string($str);
801 * Changes a query string for various DBMS specific reasons
803 * This little hack lets you know how many rows were deleted
804 * when running a "DELETE FROM table" query. Only implemented
805 * if the DB_PORTABILITY_DELETE_COUNT portability option is on.
807 * @param string $query the query string to modify
809 * @return string the modified query string
812 * @see DB_common::setOption()
814 function modifyQuery($query)
816 if ($this->options['portability'] & DB_PORTABILITY_DELETE_COUNT) {
817 // "DELETE FROM table" gives 0 affected rows in MySQL.
818 // This little hack lets you know how many rows were deleted.
819 if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $query)) {
820 $query = preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/',
821 'DELETE FROM \1 WHERE 1=1', $query);
828 // {{{ modifyLimitQuery()
831 * Adds LIMIT clauses to a query string according to current DBMS standards
833 * @param string $query the query to modify
834 * @param int $from the row to start to fetching (0 = the first row)
835 * @param int $count the numbers of rows to fetch
836 * @param mixed $params array, string or numeric data to be used in
837 * execution of the statement. Quantity of items
838 * passed must match quantity of placeholders in
839 * query: meaning 1 placeholder for non-array
840 * parameters or 1 placeholder per array element.
842 * @return string the query string with LIMIT clauses added
846 function modifyLimitQuery($query, $from, $count, $params = array())
848 if (DB::isManip($query) || $this->_next_query_manip) {
849 return $query . " LIMIT $count";
851 return $query . " LIMIT $from, $count";
856 // {{{ mysqlRaiseError()
859 * Produces a DB_Error object regarding the current problem
861 * @param int $errno if the error is being manually raised pass a
862 * DB_ERROR* constant here. If this isn't passed
863 * the error information gathered from the DBMS.
865 * @return object the DB_Error object
867 * @see DB_common::raiseError(),
868 * DB_mysql::errorNative(), DB_common::errorCode()
870 function mysqlRaiseError($errno = null)
872 if ($errno === null) {
873 if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
874 $this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
875 $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
876 $this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
878 // Doing this in case mode changes during runtime.
879 $this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
880 $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
881 $this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
883 $errno = $this->errorCode(mysql_errno($this->connection));
885 return $this->raiseError($errno, null, null, null,
886 @mysql_errno($this->connection) . ' ** ' .
887 @mysql_error($this->connection));
894 * Gets the DBMS' native error code produced by the last query
896 * @return int the DBMS' error code
898 function errorNative()
900 return @mysql_errno($this->connection);
907 * Returns information about a table or a result set
909 * @param object|string $result DB_result object from a query or a
910 * string containing the name of a table.
911 * While this also accepts a query result
912 * resource identifier, this behavior is
914 * @param int $mode a valid tableInfo mode
916 * @return array an associative array with the information requested.
917 * A DB_Error object on failure.
919 * @see DB_common::tableInfo()
921 function tableInfo($result, $mode = null)
923 if (is_string($result)) {
924 // Fix for bug #11580.
926 if (!@mysql_select_db($this->_db, $this->connection)) {
927 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
932 * Probably received a table name.
933 * Create a result resource identifier.
935 $id = @mysql_query("SELECT * FROM $result LIMIT 0",
938 } elseif (isset($result->result)) {
940 * Probably received a result object.
941 * Extract the result resource identifier.
943 $id = $result->result;
947 * Probably received a result resource identifier.
949 * Deprecated. Here for compatibility only.
955 if (!is_resource($id)) {
956 return $this->mysqlRaiseError(DB_ERROR_NEED_MORE_DATA);
959 if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
960 $case_func = 'strtolower';
962 $case_func = 'strval';
965 $count = @mysql_num_fields($id);
969 $res['num_fields'] = $count;
972 for ($i = 0; $i < $count; $i++) {
974 'table' => $case_func(@mysql_field_table($id, $i)),
975 'name' => $case_func(@mysql_field_name($id, $i)),
976 'type' => @mysql_field_type($id, $i),
977 'len' => @mysql_field_len($id, $i),
978 'flags' => @mysql_field_flags($id, $i),
980 if ($mode & DB_TABLEINFO_ORDER) {
981 $res['order'][$res[$i]['name']] = $i;
983 if ($mode & DB_TABLEINFO_ORDERTABLE) {
984 $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
988 // free the result only if we were called on a table
990 @mysql_free_result($id);
996 // {{{ getSpecialQuery()
999 * Obtains the query string needed for listing a given type of objects
1001 * @param string $type the kind of objects you want to retrieve
1003 * @return string the SQL query string or null if the driver doesn't
1004 * support the object type requested
1007 * @see DB_common::getListOf()
1009 function getSpecialQuery($type)
1013 return 'SHOW TABLES';
1015 return 'SELECT DISTINCT User FROM mysql.user';
1017 return 'SHOW DATABASES';