MDB2.php

 * @package     MDB2
 * @category    Database
 * @author Stig Bakken <ssb@fast.no>
 */
class MDB2_Error extends PEAR_Error
{
    // {{{ constructor: function MDB2_Error($code = MDB2_ERROR, $mode = PEAR_ERROR_RETURN, $level = E_USER_NOTICE, $debuginfo = null)

    /**
     * MDB2_Error constructor.
     *
     * @param   mixed   MDB2 error code, or string with error message.
     * @param   int     what 'error mode' to operate in
     * @param   int     what error level to use for $mode raPEAR_ERROR_TRIGGER
     * @param   mixed   additional debug info, such as the last query
     */
    function MDB2_Error($code = MDB2_ERROR, $mode = PEAR_ERROR_RETURN,
              $level = E_USER_NOTICE, $debuginfo = null, $dummy = null)
    {
        if (is_null($code)) {
            $code = MDB2_ERROR;
        }
        $this->PEAR_Error('MDB2 Error: '.MDB2::errorMessage($code), $code,
            $mode, $level, $debuginfo);
    }

    // }}}
}

// }}}
// {{{ class MDB2_Driver_Common extends PEAR

/**
 * MDB2_Driver_Common: Base class that is extended by each MDB2 driver
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Driver_Common extends PEAR
{
    // {{{ Variables (Properties)

    /**
     * index of the MDB2 object within the $GLOBALS['_MDB2_databases'] array
     * @var     int
     * @access  public
     */
    var $db_index = 0;

    /**
     * DSN used for the next query
     * @var     array
     * @access  protected
     */
    var $dsn = array();

    /**
     * DSN that was used to create the current connection
     * @var     array
     * @access  protected
     */
    var $connected_dsn = array();

    /**
     * connection resource
     * @var     mixed
     * @access  protected
     */
    var $connection = 0;

    /**
     * if the current opened connection is a persistent connection
     * @var     bool
     * @access  protected
     */
    var $opened_persistent;

    /**
     * the name of the database for the next query
     * @var     string
     * @access  protected
     */
    var $database_name = '';

    /**
     * the name of the database currently selected
     * @var     string
     * @access  protected
     */
    var $connected_database_name = '';

    /**
     * server version information
     * @var     string
     * @access  protected
     */
    var $connected_server_info = '';

    /**
     * list of all supported features of the given driver
     * @var     array
     * @access  public
     */
    var $supported = array(
        'sequences' => false,
        'indexes' => false,
        'affected_rows' => false,
        'summary_functions' => false,
        'order_by_text' => false,
        'transactions' => false,
        'savepoints' => false,
        'current_id' => false,
        'limit_queries' => false,
        'LOBs' => false,
        'replace' => false,
        'sub_selects' => false,
        'triggers' => false,
        'auto_increment' => false,
        'primary_key' => false,
        'result_introspection' => false,
        'prepared_statements' => false,
        'identifier_quoting' => false,
        'pattern_escaping' => false,
        'new_link' => false,
    );

    /**
     * Array of supported options that can be passed to the MDB2 instance.
     * 
     * The options can be set during object creation, using
     * MDB2::connect(), MDB2::factory() or MDB2::singleton(). The options can 
     * also be set after the object is created, using MDB2::setOptions() or 
     * MDB2_Driver_Common::setOption().
     * The list of available option includes:
     * <ul>
     *  <li>$options['ssl'] -> boolean: determines if ssl should be used for connections</li>
     *  <li>$options['field_case'] -> CASE_LOWER|CASE_UPPER: determines what case to force on field/table names</li>
     *  <li>$options['disable_query'] -> boolean: determines if queries should be executed</li>
     *  <li>$options['result_class'] -> string: class used for result sets</li>
     *  <li>$options['buffered_result_class'] -> string: class used for buffered result sets</li>
     *  <li>$options['result_wrap_class'] -> string: class used to wrap result sets into</li>
     *  <li>$options['result_buffering'] -> boolean should results be buffered or not?</li>
     *  <li>$options['fetch_class'] -> string: class to use when fetch mode object is used</li>
     *  <li>$options['persistent'] -> boolean: persistent connection?</li>
     *  <li>$options['debug'] -> integer: numeric debug level</li>
     *  <li>$options['debug_handler'] -> string: function/method that captures debug messages</li>
     *  <li>$options['debug_expanded_output'] -> bool: BC option to determine if more context information should be send to the debug handler</li>
     *  <li>$options['default_text_field_length'] -> integer: default text field length to use</li>
     *  <li>$options['lob_buffer_length'] -> integer: LOB buffer length</li>
     *  <li>$options['log_line_break'] -> string: line-break format</li>
     *  <li>$options['idxname_format'] -> string: pattern for index name</li>
     *  <li>$options['seqname_format'] -> string: pattern for sequence name</li>
     *  <li>$options['savepoint_format'] -> string: pattern for auto generated savepoint names</li>
     *  <li>$options['statement_format'] -> string: pattern for prepared statement names</li>
     *  <li>$options['seqcol_name'] -> string: sequence column name</li>
     *  <li>$options['quote_identifier'] -> boolean: if identifier quoting should be done when check_option is used</li>
     *  <li>$options['use_transactions'] -> boolean: if transaction use should be enabled</li>
     *  <li>$options['decimal_places'] -> integer: number of decimal places to handle</li>
     *  <li>$options['portability'] -> integer: portability constant</li>
     *  <li>$options['modules'] -> array: short to long module name mapping for __call()</li>
     *  <li>$options['emulate_prepared'] -> boolean: force prepared statements to be emulated</li>
     *  <li>$options['datatype_map'] -> array: map user defined datatypes to other primitive datatypes</li>
     *  <li>$options['datatype_map_callback'] -> array: callback function/method that should be called</li>
     *  <li>$options['bindname_format'] -> string: regular expression pattern for named parameters</li>
     *  <li>$options['multi_query'] -> boolean: determines if queries returning multiple result sets should be executed</li>
     *  <li>$options['max_identifiers_length'] -> integer: max identifier length</li>
     *  <li>$options['default_fk_action_onupdate'] -> string: default FOREIGN KEY ON UPDATE action ['RESTRICT'|'NO ACTION'|'SET DEFAULT'|'SET NULL'|'CASCADE']</li>
     *  <li>$options['default_fk_action_ondelete'] -> string: default FOREIGN KEY ON DELETE action ['RESTRICT'|'NO ACTION'|'SET DEFAULT'|'SET NULL'|'CASCADE']</li>
     * </ul>
     *
     * @var     array
     * @access  public
     * @see     MDB2::connect()
     * @see     MDB2::factory()
     * @see     MDB2::singleton()
     * @see     MDB2_Driver_Common::setOption()
     */
    var $options = array(
        'ssl' => false,
        'field_case' => CASE_LOWER,
        'disable_query' => false,
        'result_class' => 'MDB2_Result_%s',
        'buffered_result_class' => 'MDB2_BufferedResult_%s',
        'result_wrap_class' => false,
        'result_buffering' => true,
        'fetch_class' => 'stdClass',
        'persistent' => false,
        'debug' => 0,
        'debug_handler' => 'MDB2_defaultDebugOutput',
        'debug_expanded_output' => false,
        'default_text_field_length' => 4096,
        'lob_buffer_length' => 8192,
        'log_line_break' => "\n",
        'idxname_format' => '%s_idx',
        'seqname_format' => '%s_seq',
        'savepoint_format' => 'MDB2_SAVEPOINT_%s',
        'statement_format' => 'MDB2_STATEMENT_%1$s_%2$s',
        'seqcol_name' => 'sequence',
        'quote_identifier' => false,
        'use_transactions' => true,
        'decimal_places' => 2,
        'portability' => MDB2_PORTABILITY_ALL,
        'modules' => array(
            'ex' => 'Extended',
            'dt' => 'Datatype',
            'mg' => 'Manager',
            'rv' => 'Reverse',
            'na' => 'Native',
            'fc' => 'Function',
        ),
        'emulate_prepared' => false,
        'datatype_map' => array(),
        'datatype_map_callback' => array(),
        'nativetype_map_callback' => array(),
        'lob_allow_url_include' => false,
        'bindname_format' => '(?:\d+)|(?:[a-zA-Z][a-zA-Z0-9_]*)',
        'max_identifiers_length' => 30,
        'default_fk_action_onupdate' => 'RESTRICT',
        'default_fk_action_ondelete' => 'RESTRICT',
    );

    /**
     * string array
     * @var     string
     * @access  protected
     */
    var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => false, 'escape_pattern' => false);

    /**
     * identifier quoting
     * @var     array
     * @access  protected
     */
    var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');

    /**
     * sql comments
     * @var     array
     * @access  protected
     */
    var $sql_comments = array(
        array('start' => '--', 'end' => "\n", 'escape' => false),
        array('start' => '/*', 'end' => '*/', 'escape' => false),
    );

    /**
     * comparision wildcards
     * @var     array
     * @access  protected
     */
    var $wildcards = array('%', '_');

    /**
     * column alias keyword
     * @var     string
     * @access  protected
     */
    var $as_keyword = ' AS ';

    /**
     * warnings
     * @var     array
     * @access  protected
     */
    var $warnings = array();

    /**
     * string with the debugging information
     * @var     string
     * @access  public
     */
    var $debug_output = '';

    /**
     * determine if there is an open transaction
     * @var     bool
     * @access  protected
     */
    var $in_transaction = false;

    /**
     * the smart transaction nesting depth
     * @var     int
     * @access  protected
     */
    var $nested_transaction_counter = null;

    /**
     * the first error that occured inside a nested transaction
     * @var     MDB2_Error|bool
     * @access  protected
     */
    var $has_transaction_error = false;

    /**
     * result offset used in the next query
     * @var     int
     * @access  protected
     */
    var $offset = 0;

    /**
     * result limit used in the next query
     * @var     int
     * @access  protected
     */
    var $limit = 0;

    /**
     * Database backend used in PHP (mysql, odbc etc.)
     * @var     string
     * @access  public
     */
    var $phptype;

    /**
     * Database used with regards to SQL syntax etc.
     * @var     string
     * @access  public
     */
    var $dbsyntax;

    /**
     * the last query sent to the driver
     * @var     string
     * @access  public
     */
    var $last_query;

    /**
     * the default fetchmode used
     * @var     int
     * @access  protected
     */
    var $fetchmode = MDB2_FETCHMODE_ORDERED;

    /**
     * array of module instances
     * @var     array
     * @access  protected
     */
    var $modules = array();

    /**
     * determines of the PHP4 destructor emulation has been enabled yet
     * @var     array
     * @access  protected
     */
    var $destructor_registered = true;

    // }}}
    // {{{ constructor: function __construct()

    /**
     * Constructor
     */
    function __construct()
    {
        end($GLOBALS['_MDB2_databases']);
        $db_index = key($GLOBALS['_MDB2_databases']) + 1;
        $GLOBALS['_MDB2_databases'][$db_index] = &$this;
        $this->db_index = $db_index;
    }


    // }}}
    // {{{ destructor: function __destruct()

    /**
     *  Destructor
     */
    function __destruct()
    {
        $this->disconnect(false);
    }

    // }}}
    // {{{ function free()

    /**
     * Free the internal references so that the instance can be destroyed
     *
     * @return  bool    true on success, false if result is invalid
     *
     * @access  public
     */
    function free()
    {
        unset($GLOBALS['_MDB2_databases'][$this->db_index]);
        unset($this->db_index);
        return MDB2_OK;
    }

    // }}}
    // {{{ function __toString()

    /**
     * String conversation
     *
     * @return  string representation of the object
     *
     * @access  public
     */
    function __toString()
    {
        $info = get_class($this);
        $info.= ': (phptype = '.$this->phptype.', dbsyntax = '.$this->dbsyntax.')';
        if ($this->connection) {
            $info.= ' [connected]';
        }
        return $info;
    }

    // }}}
    // {{{ function errorInfo($error = null)

    /**
     * This method is used to collect information about an error
     *
     * @param   mixed   error code or resource
     *
     * @return  array   with MDB2 errorcode, native error code, native message
     *
     * @access  public
     */
    function errorInfo($error = null)
    {
        return array($error, null, null);
    }

    // }}}
    // {{{ function &raiseError($code = null, $mode = null, $options = null, $userinfo = null)

    /**
     * This method is used to communicate an error and invoke error
     * callbacks etc.  Basically a wrapper for PEAR::raiseError
     * without the message string.
     *
     * @param mixed  $code     integer error code, or a PEAR error object (all 
     *                         other parameters are ignored if this parameter is
     *                         an object
     * @param int    $mode     error mode, see PEAR_Error docs
     * @param mixed  $options  If error mode is PEAR_ERROR_TRIGGER, this is the
     *                         error level (E_USER_NOTICE etc). If error mode is
     *                         PEAR_ERROR_CALLBACK, this is the callback function,
     *                         either as a function name, or as an array of an
     *                         object and method name. For other error modes this
     *                         parameter is ignored.
     * @param string $userinfo Extra debug information. Defaults to the last
     *                         query and native error code.
     * @param string $method   name of the method that triggered the error
     * @param string $dummy1   not used
     * @param bool   $dummy2   not used
     *
     * @return PEAR_Error instance of a PEAR Error object
     * @access public
     * @see    PEAR_Error
     */
    function raiseError($code = null,
                         $mode = null,
                         $options = null,
                         $userinfo = null,
                         $method = null,
                         $dummy1 = null,
                         $dummy2 = false
    ) {
        $userinfo = "[Error message: $userinfo]\n";
        // The error is yet a MDB2 error object
        if (PEAR::isError($code)) {
            // because we use the static PEAR::raiseError, our global
            // handler should be used if it is set
            if (is_null($mode) && !empty($this->_default_error_mode)) {
                $mode    = $this->_default_error_mode;
                $options = $this->_default_error_options;
            }
            if (is_null($userinfo)) {
                $userinfo = $code->getUserinfo();
            }
            $code = $code->getCode();
        } elseif ($code == MDB2_ERROR_NOT_FOUND) {
            // extension not loaded: don't call $this->errorInfo() or the script
            // will die
        } elseif (isset($this->connection)) {
            if (!empty($this->last_query)) {
                $userinfo.= "[Last executed query: {$this->last_query}]\n";
            }
            $native_errno = $native_msg = null;
            list($code, $native_errno, $native_msg) = $this->errorInfo($code);
            if (!is_null($native_errno) && $native_errno !== '') {
                $userinfo.= "[Native code: $native_errno]\n";
            }
            if (!is_null($native_msg) && $native_msg !== '') {
                $userinfo.= "[Native message: ". strip_tags($native_msg) ."]\n";
            }
            echo $userinfo;
            if (!is_null($method)) {
                $userinfo = $method.': '.$userinfo;
            }
        }

        $err = PEAR::raiseError(null, $code, $mode, $options, $userinfo, 'MDB2_Error', true);
        if ($err->getMode() !== PEAR_ERROR_RETURN
            && isset($this->nested_transaction_counter) && !$this->has_transaction_error) {
            $this->has_transaction_error =$err;
        }
        return $err;
    }

    // }}}
    // {{{ function resetWarnings()

    /**
     * reset the warning array
     *
     * @return void
     *
     * @access  public
     */
    function resetWarnings()
    {
        $this->warnings = array();
    }

    // }}}
    // {{{ function getWarnings()

    /**
     * Get all warnings in reverse order.
     * This means that the last warning is the first element in the array
     *
     * @return  array   with warnings
     *
     * @access  public
     * @see     resetWarnings()
     */
    function getWarnings()
    {
        return array_reverse($this->warnings);
    }

    // }}}
    // {{{ function setFetchMode($fetchmode, $object_class = 'stdClass')

    /**
     * Sets which fetch mode should be used by default on queries
     * on this connection
     *
     * @param   int     MDB2_FETCHMODE_ORDERED, MDB2_FETCHMODE_ASSOC
     *                               or MDB2_FETCHMODE_OBJECT
     * @param   string  the class name of the object to be returned
     *                               by the fetch methods when the
     *                               MDB2_FETCHMODE_OBJECT mode is selected.
     *                               If no class is specified by default a cast
     *                               to object from the assoc array row will be
     *                               done.  There is also the possibility to use
     *                               and extend the 'MDB2_row' class.
     *
     * @return  mixed   MDB2_OK or MDB2 Error Object
     *
     * @access  public
     * @see     MDB2_FETCHMODE_ORDERED, MDB2_FETCHMODE_ASSOC, MDB2_FETCHMODE_OBJECT
     */
    function setFetchMode($fetchmode, $object_class = 'stdClass')
    {
        switch ($fetchmode) {
        case MDB2_FETCHMODE_OBJECT:
            $this->options['fetch_class'] = $object_class;
        case MDB2_FETCHMODE_ORDERED:
        case MDB2_FETCHMODE_ASSOC:
            $this->fetchmode = $fetchmode;
            break;
        default:
            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
                'invalid fetchmode mode', __FUNCTION__);
        }

        return MDB2_OK;
    }

    // }}}
    // {{{ function setOption($option, $value)

    /**
     * set the option for the db class
     *
     * @param   string  option name
     * @param   mixed   value for the option
     *
     * @return  mixed   MDB2_OK or MDB2 Error Object
     *
     * @access  public
     */
    function setOption($option, $value)
    {
        if (array_key_exists($option, $this->options)) {
            $this->options[$option] = $value;
            return MDB2_OK;
        }
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            "unknown option $option", __FUNCTION__);
    }

    // }}}
    // {{{ function getOption($option)

    /**
     * Returns the value of an option
     *
     * @param   string  option name
     *
     * @return  mixed   the option value or error object
     *
     * @access  public
     */
    function getOption($option)
    {
        if (array_key_exists($option, $this->options)) {
            return $this->options[$option];
        }
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            "unknown option $option", __FUNCTION__);
    }

    // }}}
    // {{{ function debug($message, $scope = '', $is_manip = null)

    /**
     * set a debug message
     *
     * @param   string  message that should be appended to the debug variable
     * @param   string  usually the method name that triggered the debug call:
     *                  for example 'query', 'prepare', 'execute', 'parameters',
     *                  'beginTransaction', 'commit', 'rollback'
     * @param   array   contains context information about the debug() call
     *                  common keys are: is_manip, time, result etc.
     *
     * @return void
     *
     * @access  public
     */
    function debug($message, $scope = '', $context = array())
    {
        if ($this->options['debug'] && $this->options['debug_handler']) {
            if (!$this->options['debug_expanded_output']) {
                if (!empty($context['when']) && $context['when'] !== 'pre') {
                    return null;
                }
                $context = empty($context['is_manip']) ? false : $context['is_manip'];
            }
            return call_user_func_array($this->options['debug_handler'], array(&$this, $scope, $message, $context));
        }
        return null;
    }

    // }}}
    // {{{ function getDebugOutput()

    /**
     * output debug info
     *
     * @return  string  content of the debug_output class variable
     *
     * @access  public
     */
    function getDebugOutput()
    {
        return $this->debug_output;
    }

    // }}}
    // {{{ function escape($text)

    /**
     * Quotes a string so it can be safely used in a query. It will quote
     * the text so it can safely be used within a query.
     *
     * @param   string  the input string to quote
     * @param   bool    escape wildcards
     *
     * @return  string  quoted string
     *
     * @access  public
     */
    function escape($text, $escape_wildcards = false)
    {
        if ($escape_wildcards) {
            $text = $this->escapePattern($text);
        }

        $text = str_replace($this->string_quoting['end'], $this->string_quoting['escape'] . $this->string_quoting['end'], $text);
        return $text;
    }

    // }}}
    // {{{ function escapePattern($text)

    /**
     * Quotes pattern (% and _) characters in a string)
     *
     * @param   string  the input string to quote
     *
     * @return  string  quoted string
     *
     * @access  public
     */
    function escapePattern($text)
    {
        if ($this->string_quoting['escape_pattern']) {
            $text = str_replace($this->string_quoting['escape_pattern'], $this->string_quoting['escape_pattern'] . $this->string_quoting['escape_pattern'], $text);
            foreach ($this->wildcards as $wildcard) {
                $text = str_replace($wildcard, $this->string_quoting['escape_pattern'] . $wildcard, $text);
            }
        }
        return $text;
    }

    // }}}
    // {{{ function quoteIdentifier($str, $check_option = false)

    /**
     * Quote a string so it can be safely used as a table or column name
     *
     * Delimiting style depends on which database driver is being used.
     *
     * NOTE: just because you CAN use delimited identifiers doesn't mean
     * you SHOULD use them.  In general, they end up causing way more
     * problems than they solve.
     *
     * NOTE: if you have table names containing periods, don't use this method
     * (@see bug #11906)
     *
     * Portability is broken by using the following characters inside
     * delimited identifiers:
     *   + backtick (<kbd>`</kbd>) -- due to MySQL
     *   + double quote (<kbd>"</kbd>) -- due to Oracle
     *   + brackets (<kbd>[</kbd> or <kbd>]</kbd>) -- due to Access
     *
     * Delimited identifiers are known to generally work correctly under
     * the following drivers:
     *   + mssql
     *   + mysql
     *   + mysqli
     *   + oci8
     *   + pgsql
     *   + sqlite
     *
     * InterBase doesn't seem to be able to use delimited identifiers
     * via PHP 4.  They work fine under PHP 5.
     *
     * @param   string  identifier name to be quoted
     * @param   bool    check the 'quote_identifier' option
     *
     * @return  string  quoted identifier string
     *
     * @access  public
     */
    function quoteIdentifier($str, $check_option = false)
    {
        if ($check_option && !$this->options['quote_identifier']) {
            return $str;
        }
        $str = str_replace($this->identifier_quoting['end'], $this->identifier_quoting['escape'] . $this->identifier_quoting['end'], $str);
        $parts = explode('.', $str);
        foreach (array_keys($parts) as $k) {
            $parts[$k] = $this->identifier_quoting['start'] . $parts[$k] . $this->identifier_quoting['end'];
        }
        return implode('.', $parts);
    }

    // }}}
    // {{{ function getAsKeyword()

    /**
     * Gets the string to alias column
     *
     * @return string to use when aliasing a column
     */
    function getAsKeyword()
    {
        return $this->as_keyword;
    }

    // }}}
    // {{{ function getConnection()

    /**
     * Returns a native connection
     *
     * @return  mixed   a valid MDB2 connection object,
     *                  or a MDB2 error object on error
     *
     * @access  public
     */
    function getConnection()
    {
        $result = $this->connect();
        if (PEAR::isError($result)) {
            return $result;
        }
        return $this->connection;
    }

     // }}}
    // {{{ function _fixResultArrayValues(&$row, $mode)

    /**
     * Do all necessary conversions on result arrays to fix DBMS quirks
     *
     * @param   array   the array to be fixed (passed by reference)
     * @param   array   bit-wise addition of the required portability modes
     *
     * @return  void
     *
     * @access  protected
     */
    function _fixResultArrayValues(&$row, $mode)
    {
        switch ($mode) {
        case MDB2_PORTABILITY_EMPTY_TO_NULL:
            foreach ($row as $key => $value) {
                if ($value === '') {
                    $row[$key] = null;
                }
            }
            break;
        case MDB2_PORTABILITY_RTRIM:
            foreach ($row as $key => $value) {
                if (is_string($value)) {
                    $row[$key] = rtrim($value);
                }
            }
            break;
        case MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES:
            $tmp_row = array();
            foreach ($row as $key => $value) {
                $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
            }
            $row = $tmp_row;
            break;
        case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_EMPTY_TO_NULL):
            foreach ($row as $key => $value) {
                if ($value === '') {
                    $row[$key] = null;
                } elseif (is_string($value)) {
                    $row[$key] = rtrim($value);
                }
            }
            break;
        case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES):
            $tmp_row = array();
            foreach ($row as $key => $value) {
                if (is_string($value)) {
                    $value = rtrim($value);
                }
                $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
            }
            $row = $tmp_row;
            break;
        case (MDB2_PORTABILITY_EMPTY_TO_NULL + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES):
            $tmp_row = array();
            foreach ($row as $key => $value) {
                if ($value === '') {
                    $value = null;
                }
                $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
            }
            $row = $tmp_row;
            break;
        case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_EMPTY_TO_NULL + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES):
            $tmp_row = array();
            foreach ($row as $key => $value) {
                if ($value === '') {
                    $value = null;
                } elseif (is_string($value)) {
                    $value = rtrim($value);
                }
                $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
            }
            $row = $tmp_row;
            break;
        }
    }

    // }}}
    // {{{ function &loadModule($module, $property = null, $phptype_specific = null)

    /**
     * loads a module
     *
     * @param   string  name of the module that should be loaded
     *                  (only used for error messages)
     * @param   string  name of the property into which the class will be loaded
     * @param   bool    if the class to load for the module is specific to the
     *                  phptype
     *
     * @return  object  on success a reference to the given module is returned
     *                  and on failure a PEAR error
     *
     * @access  public
     */
    function &loadModule($module, $property = null, $phptype_specific = null)
    {
        if (!$property) {
            $property = strtolower($module);
        }

        if (!isset($this->{$property})) {
            $version = $phptype_specific;
            if ($phptype_specific !== false) {
                $version = true;
                $class_name = 'MDB2_Driver_'.$module.'_'.$this->phptype;
                $file_name = str_replace('_', DIRECTORY_SEPARATOR, $class_name).'.php';
            }
            if ($phptype_specific === false
                || (!MDB2::classExists($class_name) && !MDB2::fileExists($file_name))
            ) {
                $version = false;
                $class_name = 'MDB2_'.$module;
                $file_name = str_replace('_', DIRECTORY_SEPARATOR, $class_name).'.php';
            }

            $err = MDB2::loadClass($class_name, $this->getOption('debug'));
            if (PEAR::isError($err)) {
                return $err;
            }
            // load module in a specific version
            if ($version) {
                if (method_exists($class_name, 'getClassName')) {
                    $class_name_new = call_user_func(array($class_name, 'getClassName'), $this->db_index);
                    if ($class_name != $class_name_new) {
                        $class_name = $class_name_new;
                        $err = MDB2::loadClass($class_name, $this->getOption('debug'));
                        if (PEAR::isError($err)) {
                            return $err;
                        }
                    }
                }
            }

            if (!MDB2::classExists($class_name)) {
                $err =$this->raiseError(MDB2_ERROR_LOADMODULE, null, null,
                    "unable to load module '$module' into property '$property'", __FUNCTION__);
                return $err;
            }
            $this->{$property} = new $class_name($this->db_index);
            $this->modules[$module] =$this->{$property};
            if ($version) {
                // this will be used in the connect method to determine if the module
                // needs to be loaded with a different version if the server
                // version changed in between connects
                $this->loaded_version_modules[] = $property;
            }
        }

        return $this->{$property};
    }

    // }}}
    // {{{ function __call($method, $params)

    /**
     * Calls a module method using the __call magic method
     *
     * @param   string  Method name.
     * @param   array   Arguments.
     *
     * @return  mixed   Returned value.
     */
    function __call($method, $params)
    {
        $module = null;
        if (preg_match('/^([a-z]+)([A-Z])(.*)$/', $method, $match)
            && isset($this->options['modules'][$match[1]])
        ) {
            $module = $this->options['modules'][$match[1]];
            $method = strtolower($match[2]).$match[3];
            if (!isset($this->modules[$module]) || !is_object($this->modules[$module])) {
                $result =& $this->loadModule($module);
                if (PEAR::isError($result)) {
                    return $result;
                }
            }
        } else {
            foreach ($this->modules as $key => $foo) {
                if (is_object($this->modules[$key])
                    && method_exists($this->modules[$key], $method)
                ) {
                    $module = $key;
                    break;
                }
            }
        }
        if (!is_null($module)) {
            return call_user_func_array(array(&$this->modules[$module], $method), $params);
        }
        trigger_error(sprintf('Call to undefined function: %s::%s().', get_class($this), $method), E_USER_ERROR);
    }

    // }}}