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 1997-2005 The PHP Group
22 * @license http://www.php.net/license/3_0.txt PHP License 3.0
23 * @version CVS: $Id: mysql.php 12 2005-10-02 11:36:35Z sparc $
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 1997-2005 The PHP Group
43 * @license http://www.php.net/license/3_0.txt PHP License 3.0
44 * @version Release: @package_version@
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,
117 * The raw database connection created by PHP
123 * The DSN information for connecting to a database
130 * Should data manipulation queries be committed automatically?
134 var $autocommit = true;
137 * The quantity of transactions begun
139 * {@internal While this is private, it can't actually be designated
140 * private in PHP 5 because it is directly accessed in the test suite.}}
145 var $transaction_opcount = 0;
148 * The database specified in the DSN
150 * It's a fix to allow calls to different databases in the same script.
162 * This constructor calls <kbd>$this->DB_common()</kbd>
175 * Connect to the database server, log in and open the database
177 * Don't call this method directly. Use DB::connect() instead.
179 * PEAR DB's mysql driver supports the following extra DSN options:
180 * + new_link If set to true, causes subsequent calls to connect()
181 * to return a new connection link instead of the
182 * existing one. WARNING: this is not portable to
183 * other DBMS's. Available since PEAR DB 1.7.0.
184 * + client_flags Any combination of MYSQL_CLIENT_* constants.
185 * Only used if PHP is at version 4.3.0 or greater.
186 * Available since PEAR DB 1.7.0.
188 * @param array $dsn the data source name
189 * @param bool $persistent should the connection be persistent?
191 * @return int DB_OK on success. A DB_Error object on failure.
193 function connect($dsn, $persistent = false)
195 if (!PEAR::loadExtension('mysql')) {
196 return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
200 if ($dsn['dbsyntax']) {
201 $this->dbsyntax = $dsn['dbsyntax'];
205 if ($dsn['protocol'] && $dsn['protocol'] == 'unix') {
206 $params[0] = ':' . $dsn['socket'];
208 $params[0] = $dsn['hostspec'] ? $dsn['hostspec']
211 $params[0] .= ':' . $dsn['port'];
214 $params[] = $dsn['username'] ? $dsn['username'] : null;
215 $params[] = $dsn['password'] ? $dsn['password'] : null;
218 if (isset($dsn['new_link'])
219 && ($dsn['new_link'] == 'true' || $dsn['new_link'] === true))
226 if (version_compare(phpversion(), '4.3.0', '>=')) {
227 $params[] = isset($dsn['client_flags'])
228 ? $dsn['client_flags'] : null;
231 $connect_function = $persistent ? 'mysql_pconnect' : 'mysql_connect';
233 $ini = ini_get('track_errors');
236 $this->connection = @call_user_func_array($connect_function,
239 ini_set('track_errors', 1);
240 $this->connection = @call_user_func_array($connect_function,
242 ini_set('track_errors', $ini);
245 if (!$this->connection) {
246 if (($err = @mysql_error()) != '') {
247 return $this->raiseError(DB_ERROR_CONNECT_FAILED,
251 return $this->raiseError(DB_ERROR_CONNECT_FAILED,
257 if ($dsn['database']) {
258 if (!@mysql_select_db($dsn['database'], $this->connection)) {
259 return $this->mysqlRaiseError();
261 $this->_db = $dsn['database'];
271 * Disconnects from the database server
273 * @return bool TRUE on success, FALSE on failure
275 function disconnect()
277 $ret = @mysql_close($this->connection);
278 $this->connection = null;
286 * Sends a query to the database server
288 * Generally uses mysql_query(). If you want to use
289 * mysql_unbuffered_query() set the "result_buffering" option to 0 using
290 * setOptions(). This option was added in Release 1.7.0.
292 * @param string the SQL query string
294 * @return mixed + a PHP result resrouce for successful SELECT queries
295 * + the DB_OK constant for other successful queries
296 * + a DB_Error object on failure
298 function simpleQuery($query)
300 $ismanip = DB::isManip($query);
301 $this->last_query = $query;
302 $query = $this->modifyQuery($query);
304 if (!@mysql_select_db($this->_db, $this->connection)) {
305 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
308 if (!$this->autocommit && $ismanip) {
309 if ($this->transaction_opcount == 0) {
310 $result = @mysql_query('SET AUTOCOMMIT=0', $this->connection);
311 $result = @mysql_query('BEGIN', $this->connection);
313 return $this->mysqlRaiseError();
316 $this->transaction_opcount++;
318 if (!$this->options['result_buffering']) {
319 $result = @mysql_unbuffered_query($query, $this->connection);
321 $result = @mysql_query($query, $this->connection);
324 return $this->mysqlRaiseError();
326 if (is_resource($result)) {
336 * Move the internal mysql result pointer to the next available result
338 * This method has not been implemented yet.
340 * @param a valid sql result resource
344 function nextResult($result)
353 * Places a row from the result set into the given array
355 * Formating of the array and the data therein are configurable.
356 * See DB_result::fetchInto() for more information.
358 * This method is not meant to be called directly. Use
359 * DB_result::fetchInto() instead. It can't be declared "protected"
360 * because DB_result is a separate object.
362 * @param resource $result the query result resource
363 * @param array $arr the referenced array to put the data in
364 * @param int $fetchmode how the resulting array should be indexed
365 * @param int $rownum the row number to fetch (0 = first row)
367 * @return mixed DB_OK on success, NULL when the end of a result set is
368 * reached or on failure
370 * @see DB_result::fetchInto()
372 function fetchInto($result, &$arr, $fetchmode, $rownum = null)
374 if ($rownum !== null) {
375 if (!@mysql_data_seek($result, $rownum)) {
379 if ($fetchmode & DB_FETCHMODE_ASSOC) {
380 $arr = @mysql_fetch_array($result, MYSQL_ASSOC);
381 if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
382 $arr = array_change_key_case($arr, CASE_LOWER);
385 $arr = @mysql_fetch_row($result);
390 if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
392 * Even though this DBMS already trims output, we do this because
393 * a field might have intentional whitespace at the end that
394 * gets removed by DB_PORTABILITY_RTRIM under another driver.
396 $this->_rtrimArrayValues($arr);
398 if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
399 $this->_convertNullArrayValuesToEmpty($arr);
408 * Deletes the result set and frees the memory occupied by the result set
410 * This method is not meant to be called directly. Use
411 * DB_result::free() instead. It can't be declared "protected"
412 * because DB_result is a separate object.
414 * @param resource $result PHP's query result resource
416 * @return bool TRUE on success, FALSE if $result is invalid
418 * @see DB_result::free()
420 function freeResult($result)
422 return @mysql_free_result($result);
429 * Gets the number of columns in a result set
431 * This method is not meant to be called directly. Use
432 * DB_result::numCols() instead. It can't be declared "protected"
433 * because DB_result is a separate object.
435 * @param resource $result PHP's query result resource
437 * @return int the number of columns. A DB_Error object on failure.
439 * @see DB_result::numCols()
441 function numCols($result)
443 $cols = @mysql_num_fields($result);
445 return $this->mysqlRaiseError();
454 * Gets the number of rows in a result set
456 * This method is not meant to be called directly. Use
457 * DB_result::numRows() instead. It can't be declared "protected"
458 * because DB_result is a separate object.
460 * @param resource $result PHP's query result resource
462 * @return int the number of rows. A DB_Error object on failure.
464 * @see DB_result::numRows()
466 function numRows($result)
468 $rows = @mysql_num_rows($result);
469 if ($rows === null) {
470 return $this->mysqlRaiseError();
479 * Enables or disables automatic commits
481 * @param bool $onoff true turns it on, false turns it off
483 * @return int DB_OK on success. A DB_Error object if the driver
484 * doesn't support auto-committing transactions.
486 function autoCommit($onoff = false)
488 // XXX if $this->transaction_opcount > 0, we should probably
489 // issue a warning here.
490 $this->autocommit = $onoff ? true : false;
498 * Commits the current transaction
500 * @return int DB_OK on success. A DB_Error object on failure.
504 if ($this->transaction_opcount > 0) {
506 if (!@mysql_select_db($this->_db, $this->connection)) {
507 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
510 $result = @mysql_query('COMMIT', $this->connection);
511 $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
512 $this->transaction_opcount = 0;
514 return $this->mysqlRaiseError();
524 * Reverts the current transaction
526 * @return int DB_OK on success. A DB_Error object on failure.
530 if ($this->transaction_opcount > 0) {
532 if (!@mysql_select_db($this->_db, $this->connection)) {
533 return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
536 $result = @mysql_query('ROLLBACK', $this->connection);
537 $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
538 $this->transaction_opcount = 0;
540 return $this->mysqlRaiseError();
547 // {{{ affectedRows()
550 * Determines the number of rows affected by a data maniuplation query
552 * 0 is returned for queries that don't manipulate data.
554 * @return int the number of rows. A DB_Error object on failure.
556 function affectedRows()
558 if (DB::isManip($this->last_query)) {
559 return @mysql_affected_rows($this->connection);
569 * Returns the next free id in a sequence
571 * @param string $seq_name name of the sequence
572 * @param boolean $ondemand when true, the seqence is automatically
573 * created if it does not exist
575 * @return int the next id number in the sequence.
576 * A DB_Error object on failure.
578 * @see DB_common::nextID(), DB_common::getSequenceName(),
579 * DB_mysql::createSequence(), DB_mysql::dropSequence()
581 function nextId($seq_name, $ondemand = true)
583 $seqname = $this->getSequenceName($seq_name);
586 $this->pushErrorHandling(PEAR_ERROR_RETURN);
587 $result = $this->query("UPDATE ${seqname} ".
588 'SET id=LAST_INSERT_ID(id+1)');
589 $this->popErrorHandling();
590 if ($result === DB_OK) {
592 $id = @mysql_insert_id($this->connection);
597 // Sequence table must be empty for some reason, so fill
598 // it and return 1 and obtain a user-level lock
599 $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
600 if (DB::isError($result)) {
601 return $this->raiseError($result);
604 // Failed to get the lock
605 return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
608 // add the default value
609 $result = $this->query("REPLACE INTO ${seqname} (id) VALUES (0)");
610 if (DB::isError($result)) {
611 return $this->raiseError($result);
615 $result = $this->getOne('SELECT RELEASE_LOCK('
616 . "'${seqname}_lock')");
617 if (DB::isError($result)) {
618 return $this->raiseError($result);
620 // We know what the result will be, so no need to try again
623 } elseif ($ondemand && DB::isError($result) &&
624 $result->getCode() == DB_ERROR_NOSUCHTABLE)
626 // ONDEMAND TABLE CREATION
627 $result = $this->createSequence($seq_name);
628 if (DB::isError($result)) {
629 return $this->raiseError($result);
634 } elseif (DB::isError($result) &&
635 $result->getCode() == DB_ERROR_ALREADY_EXISTS)
638 // see _BCsequence() comment
639 $result = $this->_BCsequence($seqname);
640 if (DB::isError($result)) {
641 return $this->raiseError($result);
647 return $this->raiseError($result);
651 // {{{ createSequence()
654 * Creates a new sequence
656 * @param string $seq_name name of the new sequence
658 * @return int DB_OK on success. A DB_Error object on failure.
660 * @see DB_common::createSequence(), DB_common::getSequenceName(),
661 * DB_mysql::nextID(), DB_mysql::dropSequence()
663 function createSequence($seq_name)
665 $seqname = $this->getSequenceName($seq_name);
666 $res = $this->query('CREATE TABLE ' . $seqname
667 . ' (id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'
668 . ' PRIMARY KEY(id))');
669 if (DB::isError($res)) {
672 // insert yields value 1, nextId call will generate ID 2
673 $res = $this->query("INSERT INTO ${seqname} (id) VALUES (0)");
674 if (DB::isError($res)) {
678 return $this->query("UPDATE ${seqname} SET id = 0");
682 // {{{ dropSequence()
687 * @param string $seq_name name of the sequence to be deleted
689 * @return int DB_OK on success. A DB_Error object on failure.
691 * @see DB_common::dropSequence(), DB_common::getSequenceName(),
692 * DB_mysql::nextID(), DB_mysql::createSequence()
694 function dropSequence($seq_name)
696 return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
703 * Backwards compatibility with old sequence emulation implementation
704 * (clean up the dupes)
706 * @param string $seqname the sequence name to clean up
708 * @return bool true on success. A DB_Error object on failure.
712 function _BCsequence($seqname)
714 // Obtain a user-level lock... this will release any previous
715 // application locks, but unlike LOCK TABLES, it does not abort
716 // the current transaction and is much less frequently used.
717 $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
718 if (DB::isError($result)) {
722 // Failed to get the lock, can't do the conversion, bail
723 // with a DB_ERROR_NOT_LOCKED error
724 return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
727 $highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
728 if (DB::isError($highest_id)) {
731 // This should kill all rows except the highest
732 // We should probably do something if $highest_id isn't
733 // numeric, but I'm at a loss as how to handle that...
734 $result = $this->query('DELETE FROM ' . $seqname
735 . " WHERE id <> $highest_id");
736 if (DB::isError($result)) {
740 // If another thread has been waiting for this lock,
741 // it will go thru the above procedure, but will have no
743 $result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
744 if (DB::isError($result)) {
751 // {{{ quoteIdentifier()
754 * Quotes a string so it can be safely used as a table or column name
756 * MySQL can't handle the backtick character (<kbd>`</kbd>) in
757 * table or column names.
759 * @param string $str identifier name to be quoted
761 * @return string quoted identifier string
763 * @see DB_common::quoteIdentifier()
764 * @since Method available since Release 1.6.0
766 function quoteIdentifier($str)
768 return '`' . $str . '`';
775 * @deprecated Deprecated in release 1.6.0
779 return $this->quoteSmart($str);
783 // {{{ escapeSimple()
786 * Escapes a string according to the current DBMS's standards
788 * @param string $str the string to be escaped
790 * @return string the escaped string
792 * @see DB_common::quoteSmart()
793 * @since Method available since Release 1.6.0
795 function escapeSimple($str)
797 if (function_exists('mysql_real_escape_string')) {
798 return @mysql_real_escape_string($str, $this->connection);
800 return @mysql_escape_string($str);
808 * Changes a query string for various DBMS specific reasons
810 * This little hack lets you know how many rows were deleted
811 * when running a "DELETE FROM table" query. Only implemented
812 * if the DB_PORTABILITY_DELETE_COUNT portability option is on.
814 * @param string $query the query string to modify
816 * @return string the modified query string
819 * @see DB_common::setOption()
821 function modifyQuery($query)
823 if ($this->options['portability'] & DB_PORTABILITY_DELETE_COUNT) {
824 // "DELETE FROM table" gives 0 affected rows in MySQL.
825 // This little hack lets you know how many rows were deleted.
826 if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $query)) {
827 $query = preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/',
828 'DELETE FROM \1 WHERE 1=1', $query);
835 // {{{ modifyLimitQuery()
838 * Adds LIMIT clauses to a query string according to current DBMS standards
840 * @param string $query the query to modify
841 * @param int $from the row to start to fetching (0 = the first row)
842 * @param int $count the numbers of rows to fetch
843 * @param mixed $params array, string or numeric data to be used in
844 * execution of the statement. Quantity of items
845 * passed must match quantity of placeholders in
846 * query: meaning 1 placeholder for non-array
847 * parameters or 1 placeholder per array element.
849 * @return string the query string with LIMIT clauses added
853 function modifyLimitQuery($query, $from, $count, $params = array())
855 if (DB::isManip($query)) {
856 return $query . " LIMIT $count";
858 return $query . " LIMIT $from, $count";
863 // {{{ mysqlRaiseError()
866 * Produces a DB_Error object regarding the current problem
868 * @param int $errno if the error is being manually raised pass a
869 * DB_ERROR* constant here. If this isn't passed
870 * the error information gathered from the DBMS.
872 * @return object the DB_Error object
874 * @see DB_common::raiseError(),
875 * DB_mysql::errorNative(), DB_common::errorCode()
877 function mysqlRaiseError($errno = null)
879 if ($errno === null) {
880 if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
881 $this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
882 $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
883 $this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
885 // Doing this in case mode changes during runtime.
886 $this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
887 $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
888 $this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
890 $errno = $this->errorCode(mysql_errno($this->connection));
892 return $this->raiseError($errno, null, null, null,
893 @mysql_errno($this->connection) . ' ** ' .
894 @mysql_error($this->connection));
901 * Gets the DBMS' native error code produced by the last query
903 * @return int the DBMS' error code
905 function errorNative()
907 return @mysql_errno($this->connection);
914 * Returns information about a table or a result set
916 * @param object|string $result DB_result object from a query or a
917 * string containing the name of a table.
918 * While this also accepts a query result
919 * resource identifier, this behavior is
921 * @param int $mode a valid tableInfo mode
923 * @return array an associative array with the information requested.
924 * A DB_Error object on failure.
926 * @see DB_common::tableInfo()
928 function tableInfo($result, $mode = null)
930 if (is_string($result)) {
932 * Probably received a table name.
933 * Create a result resource identifier.
935 $id = @mysql_list_fields($this->dsn['database'],
936 $result, $this->connection);
938 } elseif (isset($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';