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+<?php
+
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * The PEAR DB driver for PHP's mysql extension
+ * for interacting with MySQL databases
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: This source file is subject to version 3.0 of the PHP license
+ * that is available through the world-wide-web at the following URI:
+ * http://www.php.net/license/3_0.txt. If you did not receive a copy of
+ * the PHP License and are unable to obtain it through the web, please
+ * send a note to license@php.net so we can mail you a copy immediately.
+ *
+ * @category Database
+ * @package DB
+ * @author Stig Bakken <ssb@php.net>
+ * @author Daniel Convissor <danielc@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version CVS: $Id$
+ * @link http://pear.php.net/package/DB
+ */
+
+/**
+ * Obtain the DB_common class so it can be extended from
+ */
+require_once 'DB/common.php';
+
+/**
+ * The methods PEAR DB uses to interact with PHP's mysql extension
+ * for interacting with MySQL databases
+ *
+ * These methods overload the ones declared in DB_common.
+ *
+ * @category Database
+ * @package DB
+ * @author Stig Bakken <ssb@php.net>
+ * @author Daniel Convissor <danielc@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version Release: @package_version@
+ * @link http://pear.php.net/package/DB
+ */
+class DB_mysql extends DB_common
+{
+ // {{{ properties
+
+ /**
+ * The DB driver type (mysql, oci8, odbc, etc.)
+ * @var string
+ */
+ var $phptype = 'mysql';
+
+ /**
+ * The database syntax variant to be used (db2, access, etc.), if any
+ * @var string
+ */
+ var $dbsyntax = 'mysql';
+
+ /**
+ * The capabilities of this DB implementation
+ *
+ * The 'new_link' element contains the PHP version that first provided
+ * new_link support for this DBMS. Contains false if it's unsupported.
+ *
+ * Meaning of the 'limit' element:
+ * + 'emulate' = emulate with fetch row by number
+ * + 'alter' = alter the query
+ * + false = skip rows
+ *
+ * @var array
+ */
+ var $features = array(
+ 'limit' => 'alter',
+ 'new_link' => '4.2.0',
+ 'numrows' => true,
+ 'pconnect' => true,
+ 'prepare' => false,
+ 'ssl' => false,
+ 'transactions' => true,
+ );
+
+ /**
+ * A mapping of native error codes to DB error codes
+ * @var array
+ */
+ var $errorcode_map = array(
+ 1004 => DB_ERROR_CANNOT_CREATE,
+ 1005 => DB_ERROR_CANNOT_CREATE,
+ 1006 => DB_ERROR_CANNOT_CREATE,
+ 1007 => DB_ERROR_ALREADY_EXISTS,
+ 1008 => DB_ERROR_CANNOT_DROP,
+ 1022 => DB_ERROR_ALREADY_EXISTS,
+ 1044 => DB_ERROR_ACCESS_VIOLATION,
+ 1046 => DB_ERROR_NODBSELECTED,
+ 1048 => DB_ERROR_CONSTRAINT,
+ 1049 => DB_ERROR_NOSUCHDB,
+ 1050 => DB_ERROR_ALREADY_EXISTS,
+ 1051 => DB_ERROR_NOSUCHTABLE,
+ 1054 => DB_ERROR_NOSUCHFIELD,
+ 1061 => DB_ERROR_ALREADY_EXISTS,
+ 1062 => DB_ERROR_ALREADY_EXISTS,
+ 1064 => DB_ERROR_SYNTAX,
+ 1091 => DB_ERROR_NOT_FOUND,
+ 1100 => DB_ERROR_NOT_LOCKED,
+ 1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
+ 1142 => DB_ERROR_ACCESS_VIOLATION,
+ 1146 => DB_ERROR_NOSUCHTABLE,
+ 1216 => DB_ERROR_CONSTRAINT,
+ 1217 => DB_ERROR_CONSTRAINT,
+ );
+
+ /**
+ * The raw database connection created by PHP
+ * @var resource
+ */
+ var $connection;
+
+ /**
+ * The DSN information for connecting to a database
+ * @var array
+ */
+ var $dsn = array();
+
+
+ /**
+ * Should data manipulation queries be committed automatically?
+ * @var bool
+ * @access private
+ */
+ var $autocommit = true;
+
+ /**
+ * The quantity of transactions begun
+ *
+ * {@internal While this is private, it can't actually be designated
+ * private in PHP 5 because it is directly accessed in the test suite.}}
+ *
+ * @var integer
+ * @access private
+ */
+ var $transaction_opcount = 0;
+
+ /**
+ * The database specified in the DSN
+ *
+ * It's a fix to allow calls to different databases in the same script.
+ *
+ * @var string
+ * @access private
+ */
+ var $_db = '';
+
+
+ // }}}
+ // {{{ constructor
+
+ /**
+ * This constructor calls <kbd>$this->DB_common()</kbd>
+ *
+ * @return void
+ */
+ function DB_mysql()
+ {
+ $this->DB_common();
+ }
+
+ // }}}
+ // {{{ connect()
+
+ /**
+ * Connect to the database server, log in and open the database
+ *
+ * Don't call this method directly. Use DB::connect() instead.
+ *
+ * PEAR DB's mysql driver supports the following extra DSN options:
+ * + new_link If set to true, causes subsequent calls to connect()
+ * to return a new connection link instead of the
+ * existing one. WARNING: this is not portable to
+ * other DBMS's. Available since PEAR DB 1.7.0.
+ * + client_flags Any combination of MYSQL_CLIENT_* constants.
+ * Only used if PHP is at version 4.3.0 or greater.
+ * Available since PEAR DB 1.7.0.
+ *
+ * @param array $dsn the data source name
+ * @param bool $persistent should the connection be persistent?
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function connect($dsn, $persistent = false)
+ {
+ if (!PEAR::loadExtension('mysql')) {
+ return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
+ }
+
+ $this->dsn = $dsn;
+ if ($dsn['dbsyntax']) {
+ $this->dbsyntax = $dsn['dbsyntax'];
+ }
+
+ $params = array();
+ if ($dsn['protocol'] && $dsn['protocol'] == 'unix') {
+ $params[0] = ':' . $dsn['socket'];
+ } else {
+ $params[0] = $dsn['hostspec'] ? $dsn['hostspec']
+ : 'localhost';
+ if ($dsn['port']) {
+ $params[0] .= ':' . $dsn['port'];
+ }
+ }
+ $params[] = $dsn['username'] ? $dsn['username'] : null;
+ $params[] = $dsn['password'] ? $dsn['password'] : null;
+
+ if (!$persistent) {
+ if (isset($dsn['new_link'])
+ && ($dsn['new_link'] == 'true' || $dsn['new_link'] === true))
+ {
+ $params[] = true;
+ } else {
+ $params[] = false;
+ }
+ }
+ if (version_compare(phpversion(), '4.3.0', '>=')) {
+ $params[] = isset($dsn['client_flags'])
+ ? $dsn['client_flags'] : null;
+ }
+
+ $connect_function = $persistent ? 'mysql_pconnect' : 'mysql_connect';
+
+ $ini = ini_get('track_errors');
+ $php_errormsg = '';
+ if ($ini) {
+ $this->connection = @call_user_func_array($connect_function,
+ $params);
+ } else {
+ ini_set('track_errors', 1);
+ $this->connection = @call_user_func_array($connect_function,
+ $params);
+ ini_set('track_errors', $ini);
+ }
+
+ if (!$this->connection) {
+ if (($err = @mysql_error()) != '') {
+ return $this->raiseError(DB_ERROR_CONNECT_FAILED,
+ null, null, null,
+ $err);
+ } else {
+ return $this->raiseError(DB_ERROR_CONNECT_FAILED,
+ null, null, null,
+ $php_errormsg);
+ }
+ }
+
+ if ($dsn['database']) {
+ if (!@mysql_select_db($dsn['database'], $this->connection)) {
+ return $this->mysqlRaiseError();
+ }
+ $this->_db = $dsn['database'];
+ }
+
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ disconnect()
+
+ /**
+ * Disconnects from the database server
+ *
+ * @return bool TRUE on success, FALSE on failure
+ */
+ function disconnect()
+ {
+ $ret = @mysql_close($this->connection);
+ $this->connection = null;
+ return $ret;
+ }
+
+ // }}}
+ // {{{ simpleQuery()
+
+ /**
+ * Sends a query to the database server
+ *
+ * Generally uses mysql_query(). If you want to use
+ * mysql_unbuffered_query() set the "result_buffering" option to 0 using
+ * setOptions(). This option was added in Release 1.7.0.
+ *
+ * @param string the SQL query string
+ *
+ * @return mixed + a PHP result resrouce for successful SELECT queries
+ * + the DB_OK constant for other successful queries
+ * + a DB_Error object on failure
+ */
+ function simpleQuery($query)
+ {
+ $ismanip = DB::isManip($query);
+ $this->last_query = $query;
+ $query = $this->modifyQuery($query);
+ if ($this->_db) {
+ if (!@mysql_select_db($this->_db, $this->connection)) {
+ return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
+ }
+ }
+ if (!$this->autocommit && $ismanip) {
+ if ($this->transaction_opcount == 0) {
+ $result = @mysql_query('SET AUTOCOMMIT=0', $this->connection);
+ $result = @mysql_query('BEGIN', $this->connection);
+ if (!$result) {
+ return $this->mysqlRaiseError();
+ }
+ }
+ $this->transaction_opcount++;
+ }
+ if (!$this->options['result_buffering']) {
+ $result = @mysql_unbuffered_query($query, $this->connection);
+ } else {
+ $result = @mysql_query($query, $this->connection);
+ }
+ if (!$result) {
+ return $this->mysqlRaiseError();
+ }
+ if (is_resource($result)) {
+ return $result;
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ nextResult()
+
+ /**
+ * Move the internal mysql result pointer to the next available result
+ *
+ * This method has not been implemented yet.
+ *
+ * @param a valid sql result resource
+ *
+ * @return false
+ */
+ function nextResult($result)
+ {
+ return false;
+ }
+
+ // }}}
+ // {{{ fetchInto()
+
+ /**
+ * Places a row from the result set into the given array
+ *
+ * Formating of the array and the data therein are configurable.
+ * See DB_result::fetchInto() for more information.
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::fetchInto() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result the query result resource
+ * @param array $arr the referenced array to put the data in
+ * @param int $fetchmode how the resulting array should be indexed
+ * @param int $rownum the row number to fetch (0 = first row)
+ *
+ * @return mixed DB_OK on success, NULL when the end of a result set is
+ * reached or on failure
+ *
+ * @see DB_result::fetchInto()
+ */
+ function fetchInto($result, &$arr, $fetchmode, $rownum = null)
+ {
+ if ($rownum !== null) {
+ if (!@mysql_data_seek($result, $rownum)) {
+ return null;
+ }
+ }
+ if ($fetchmode & DB_FETCHMODE_ASSOC) {
+ $arr = @mysql_fetch_array($result, MYSQL_ASSOC);
+ if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
+ $arr = array_change_key_case($arr, CASE_LOWER);
+ }
+ } else {
+ $arr = @mysql_fetch_row($result);
+ }
+ if (!$arr) {
+ return null;
+ }
+ if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
+ /*
+ * Even though this DBMS already trims output, we do this because
+ * a field might have intentional whitespace at the end that
+ * gets removed by DB_PORTABILITY_RTRIM under another driver.
+ */
+ $this->_rtrimArrayValues($arr);
+ }
+ if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
+ $this->_convertNullArrayValuesToEmpty($arr);
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ freeResult()
+
+ /**
+ * Deletes the result set and frees the memory occupied by the result set
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::free() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return bool TRUE on success, FALSE if $result is invalid
+ *
+ * @see DB_result::free()
+ */
+ function freeResult($result)
+ {
+ return @mysql_free_result($result);
+ }
+
+ // }}}
+ // {{{ numCols()
+
+ /**
+ * Gets the number of columns in a result set
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::numCols() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return int the number of columns. A DB_Error object on failure.
+ *
+ * @see DB_result::numCols()
+ */
+ function numCols($result)
+ {
+ $cols = @mysql_num_fields($result);
+ if (!$cols) {
+ return $this->mysqlRaiseError();
+ }
+ return $cols;
+ }
+
+ // }}}
+ // {{{ numRows()
+
+ /**
+ * Gets the number of rows in a result set
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::numRows() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return int the number of rows. A DB_Error object on failure.
+ *
+ * @see DB_result::numRows()
+ */
+ function numRows($result)
+ {
+ $rows = @mysql_num_rows($result);
+ if ($rows === null) {
+ return $this->mysqlRaiseError();
+ }
+ return $rows;
+ }
+
+ // }}}
+ // {{{ autoCommit()
+
+ /**
+ * Enables or disables automatic commits
+ *
+ * @param bool $onoff true turns it on, false turns it off
+ *
+ * @return int DB_OK on success. A DB_Error object if the driver
+ * doesn't support auto-committing transactions.
+ */
+ function autoCommit($onoff = false)
+ {
+ // XXX if $this->transaction_opcount > 0, we should probably
+ // issue a warning here.
+ $this->autocommit = $onoff ? true : false;
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ commit()
+
+ /**
+ * Commits the current transaction
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function commit()
+ {
+ if ($this->transaction_opcount > 0) {
+ if ($this->_db) {
+ if (!@mysql_select_db($this->_db, $this->connection)) {
+ return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
+ }
+ }
+ $result = @mysql_query('COMMIT', $this->connection);
+ $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
+ $this->transaction_opcount = 0;
+ if (!$result) {
+ return $this->mysqlRaiseError();
+ }
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ rollback()
+
+ /**
+ * Reverts the current transaction
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function rollback()
+ {
+ if ($this->transaction_opcount > 0) {
+ if ($this->_db) {
+ if (!@mysql_select_db($this->_db, $this->connection)) {
+ return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
+ }
+ }
+ $result = @mysql_query('ROLLBACK', $this->connection);
+ $result = @mysql_query('SET AUTOCOMMIT=1', $this->connection);
+ $this->transaction_opcount = 0;
+ if (!$result) {
+ return $this->mysqlRaiseError();
+ }
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ affectedRows()
+
+ /**
+ * Determines the number of rows affected by a data maniuplation query
+ *
+ * 0 is returned for queries that don't manipulate data.
+ *
+ * @return int the number of rows. A DB_Error object on failure.
+ */
+ function affectedRows()
+ {
+ if (DB::isManip($this->last_query)) {
+ return @mysql_affected_rows($this->connection);
+ } else {
+ return 0;
+ }
+ }
+
+ // }}}
+ // {{{ nextId()
+
+ /**
+ * Returns the next free id in a sequence
+ *
+ * @param string $seq_name name of the sequence
+ * @param boolean $ondemand when true, the seqence is automatically
+ * created if it does not exist
+ *
+ * @return int the next id number in the sequence.
+ * A DB_Error object on failure.
+ *
+ * @see DB_common::nextID(), DB_common::getSequenceName(),
+ * DB_mysql::createSequence(), DB_mysql::dropSequence()
+ */
+ function nextId($seq_name, $ondemand = true)
+ {
+ $seqname = $this->getSequenceName($seq_name);
+ do {
+ $repeat = 0;
+ $this->pushErrorHandling(PEAR_ERROR_RETURN);
+ $result = $this->query("UPDATE ${seqname} ".
+ 'SET id=LAST_INSERT_ID(id+1)');
+ $this->popErrorHandling();
+ if ($result === DB_OK) {
+ // COMMON CASE
+ $id = @mysql_insert_id($this->connection);
+ if ($id != 0) {
+ return $id;
+ }
+ // EMPTY SEQ TABLE
+ // Sequence table must be empty for some reason, so fill
+ // it and return 1 and obtain a user-level lock
+ $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+ if ($result == 0) {
+ // Failed to get the lock
+ return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
+ }
+
+ // add the default value
+ $result = $this->query("REPLACE INTO ${seqname} (id) VALUES (0)");
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+
+ // Release the lock
+ $result = $this->getOne('SELECT RELEASE_LOCK('
+ . "'${seqname}_lock')");
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+ // We know what the result will be, so no need to try again
+ return 1;
+
+ } elseif ($ondemand && DB::isError($result) &&
+ $result->getCode() == DB_ERROR_NOSUCHTABLE)
+ {
+ // ONDEMAND TABLE CREATION
+ $result = $this->createSequence($seq_name);
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ } else {
+ $repeat = 1;
+ }
+
+ } elseif (DB::isError($result) &&
+ $result->getCode() == DB_ERROR_ALREADY_EXISTS)
+ {
+ // BACKWARDS COMPAT
+ // see _BCsequence() comment
+ $result = $this->_BCsequence($seqname);
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+ $repeat = 1;
+ }
+ } while ($repeat);
+
+ return $this->raiseError($result);
+ }
+
+ // }}}
+ // {{{ createSequence()
+
+ /**
+ * Creates a new sequence
+ *
+ * @param string $seq_name name of the new sequence
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ *
+ * @see DB_common::createSequence(), DB_common::getSequenceName(),
+ * DB_mysql::nextID(), DB_mysql::dropSequence()
+ */
+ function createSequence($seq_name)
+ {
+ $seqname = $this->getSequenceName($seq_name);
+ $res = $this->query('CREATE TABLE ' . $seqname
+ . ' (id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'
+ . ' PRIMARY KEY(id))');
+ if (DB::isError($res)) {
+ return $res;
+ }
+ // insert yields value 1, nextId call will generate ID 2
+ $res = $this->query("INSERT INTO ${seqname} (id) VALUES (0)");
+ if (DB::isError($res)) {
+ return $res;
+ }
+ // so reset to zero
+ return $this->query("UPDATE ${seqname} SET id = 0");
+ }
+
+ // }}}
+ // {{{ dropSequence()
+
+ /**
+ * Deletes a sequence
+ *
+ * @param string $seq_name name of the sequence to be deleted
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ *
+ * @see DB_common::dropSequence(), DB_common::getSequenceName(),
+ * DB_mysql::nextID(), DB_mysql::createSequence()
+ */
+ function dropSequence($seq_name)
+ {
+ return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
+ }
+
+ // }}}
+ // {{{ _BCsequence()
+
+ /**
+ * Backwards compatibility with old sequence emulation implementation
+ * (clean up the dupes)
+ *
+ * @param string $seqname the sequence name to clean up
+ *
+ * @return bool true on success. A DB_Error object on failure.
+ *
+ * @access private
+ */
+ function _BCsequence($seqname)
+ {
+ // Obtain a user-level lock... this will release any previous
+ // application locks, but unlike LOCK TABLES, it does not abort
+ // the current transaction and is much less frequently used.
+ $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
+ if (DB::isError($result)) {
+ return $result;
+ }
+ if ($result == 0) {
+ // Failed to get the lock, can't do the conversion, bail
+ // with a DB_ERROR_NOT_LOCKED error
+ return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
+ }
+
+ $highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
+ if (DB::isError($highest_id)) {
+ return $highest_id;
+ }
+ // This should kill all rows except the highest
+ // We should probably do something if $highest_id isn't
+ // numeric, but I'm at a loss as how to handle that...
+ $result = $this->query('DELETE FROM ' . $seqname
+ . " WHERE id <> $highest_id");
+ if (DB::isError($result)) {
+ return $result;
+ }
+
+ // If another thread has been waiting for this lock,
+ // it will go thru the above procedure, but will have no
+ // real effect
+ $result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
+ if (DB::isError($result)) {
+ return $result;
+ }
+ return true;
+ }
+
+ // }}}
+ // {{{ quoteIdentifier()
+
+ /**
+ * Quotes a string so it can be safely used as a table or column name
+ *
+ * MySQL can't handle the backtick character (<kbd>`</kbd>) in
+ * table or column names.
+ *
+ * @param string $str identifier name to be quoted
+ *
+ * @return string quoted identifier string
+ *
+ * @see DB_common::quoteIdentifier()
+ * @since Method available since Release 1.6.0
+ */
+ function quoteIdentifier($str)
+ {
+ return '`' . $str . '`';
+ }
+
+ // }}}
+ // {{{ quote()
+
+ /**
+ * @deprecated Deprecated in release 1.6.0
+ */
+ function quote($str)
+ {
+ return $this->quoteSmart($str);
+ }
+
+ // }}}
+ // {{{ escapeSimple()
+
+ /**
+ * Escapes a string according to the current DBMS's standards
+ *
+ * @param string $str the string to be escaped
+ *
+ * @return string the escaped string
+ *
+ * @see DB_common::quoteSmart()
+ * @since Method available since Release 1.6.0
+ */
+ function escapeSimple($str)
+ {
+ if (function_exists('mysql_real_escape_string')) {
+ return @mysql_real_escape_string($str, $this->connection);
+ } else {
+ return @mysql_escape_string($str);
+ }
+ }
+
+ // }}}
+ // {{{ modifyQuery()
+
+ /**
+ * Changes a query string for various DBMS specific reasons
+ *
+ * This little hack lets you know how many rows were deleted
+ * when running a "DELETE FROM table" query. Only implemented
+ * if the DB_PORTABILITY_DELETE_COUNT portability option is on.
+ *
+ * @param string $query the query string to modify
+ *
+ * @return string the modified query string
+ *
+ * @access protected
+ * @see DB_common::setOption()
+ */
+ function modifyQuery($query)
+ {
+ if ($this->options['portability'] & DB_PORTABILITY_DELETE_COUNT) {
+ // "DELETE FROM table" gives 0 affected rows in MySQL.
+ // This little hack lets you know how many rows were deleted.
+ if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $query)) {
+ $query = preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/',
+ 'DELETE FROM \1 WHERE 1=1', $query);
+ }
+ }
+ return $query;
+ }
+
+ // }}}
+ // {{{ modifyLimitQuery()
+
+ /**
+ * Adds LIMIT clauses to a query string according to current DBMS standards
+ *
+ * @param string $query the query to modify
+ * @param int $from the row to start to fetching (0 = the first row)
+ * @param int $count the numbers of rows to fetch
+ * @param mixed $params array, string or numeric data to be used in
+ * execution of the statement. Quantity of items
+ * passed must match quantity of placeholders in
+ * query: meaning 1 placeholder for non-array
+ * parameters or 1 placeholder per array element.
+ *
+ * @return string the query string with LIMIT clauses added
+ *
+ * @access protected
+ */
+ function modifyLimitQuery($query, $from, $count, $params = array())
+ {
+ if (DB::isManip($query)) {
+ return $query . " LIMIT $count";
+ } else {
+ return $query . " LIMIT $from, $count";
+ }
+ }
+
+ // }}}
+ // {{{ mysqlRaiseError()
+
+ /**
+ * Produces a DB_Error object regarding the current problem
+ *
+ * @param int $errno if the error is being manually raised pass a
+ * DB_ERROR* constant here. If this isn't passed
+ * the error information gathered from the DBMS.
+ *
+ * @return object the DB_Error object
+ *
+ * @see DB_common::raiseError(),
+ * DB_mysql::errorNative(), DB_common::errorCode()
+ */
+ function mysqlRaiseError($errno = null)
+ {
+ if ($errno === null) {
+ if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
+ $this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
+ $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
+ $this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
+ } else {
+ // Doing this in case mode changes during runtime.
+ $this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
+ $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
+ $this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
+ }
+ $errno = $this->errorCode(mysql_errno($this->connection));
+ }
+ return $this->raiseError($errno, null, null, null,
+ @mysql_errno($this->connection) . ' ** ' .
+ @mysql_error($this->connection));
+ }
+
+ // }}}
+ // {{{ errorNative()
+
+ /**
+ * Gets the DBMS' native error code produced by the last query
+ *
+ * @return int the DBMS' error code
+ */
+ function errorNative()
+ {
+ return @mysql_errno($this->connection);
+ }
+
+ // }}}
+ // {{{ tableInfo()
+
+ /**
+ * Returns information about a table or a result set
+ *
+ * @param object|string $result DB_result object from a query or a
+ * string containing the name of a table.
+ * While this also accepts a query result
+ * resource identifier, this behavior is
+ * deprecated.
+ * @param int $mode a valid tableInfo mode
+ *
+ * @return array an associative array with the information requested.
+ * A DB_Error object on failure.
+ *
+ * @see DB_common::tableInfo()
+ */
+ function tableInfo($result, $mode = null)
+ {
+ if (is_string($result)) {
+ /*
+ * Probably received a table name.
+ * Create a result resource identifier.
+ */
+ $id = @mysql_list_fields($this->dsn['database'],
+ $result, $this->connection);
+ $got_string = true;
+ } elseif (isset($result->result)) {
+ /*
+ * Probably received a result object.
+ * Extract the result resource identifier.
+ */
+ $id = $result->result;
+ $got_string = false;
+ } else {
+ /*
+ * Probably received a result resource identifier.
+ * Copy it.
+ * Deprecated. Here for compatibility only.
+ */
+ $id = $result;
+ $got_string = false;
+ }
+
+ if (!is_resource($id)) {
+ return $this->mysqlRaiseError(DB_ERROR_NEED_MORE_DATA);
+ }
+
+ if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
+ $case_func = 'strtolower';
+ } else {
+ $case_func = 'strval';
+ }
+
+ $count = @mysql_num_fields($id);
+ $res = array();
+
+ if ($mode) {
+ $res['num_fields'] = $count;
+ }
+
+ for ($i = 0; $i < $count; $i++) {
+ $res[$i] = array(
+ 'table' => $case_func(@mysql_field_table($id, $i)),
+ 'name' => $case_func(@mysql_field_name($id, $i)),
+ 'type' => @mysql_field_type($id, $i),
+ 'len' => @mysql_field_len($id, $i),
+ 'flags' => @mysql_field_flags($id, $i),
+ );
+ if ($mode & DB_TABLEINFO_ORDER) {
+ $res['order'][$res[$i]['name']] = $i;
+ }
+ if ($mode & DB_TABLEINFO_ORDERTABLE) {
+ $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
+ }
+ }
+
+ // free the result only if we were called on a table
+ if ($got_string) {
+ @mysql_free_result($id);
+ }
+ return $res;
+ }
+
+ // }}}
+ // {{{ getSpecialQuery()
+
+ /**
+ * Obtains the query string needed for listing a given type of objects
+ *
+ * @param string $type the kind of objects you want to retrieve
+ *
+ * @return string the SQL query string or null if the driver doesn't
+ * support the object type requested
+ *
+ * @access protected
+ * @see DB_common::getListOf()
+ */
+ function getSpecialQuery($type)
+ {
+ switch ($type) {
+ case 'tables':
+ return 'SHOW TABLES';
+ case 'users':
+ return 'SELECT DISTINCT User FROM mysql.user';
+ case 'databases':
+ return 'SHOW DATABASES';
+ default:
+ return null;
+ }
+ }
+
+ // }}}
+
+}
+
+/*
+ * Local variables:
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ */
+
+?>