mysql.php

This is the script which used on 10minutemail.com for temporary email.

    /**
     * return version information about the server
     *
     * @param string     $native  determines if the raw version string should be returned
     * @return mixed array/string with version information or MDB2 error object
     * @access public
     */
    function getServerVersion($native = false)
    {
        $connection = $this->getConnection();
        if (PEAR::isError($connection)) {
            return $connection;
        }
        if ($this->connected_server_info) {
            $server_info = $this->connected_server_info;
        } else {
            $server_info = @mysql_get_server_info($connection);
        }
        if (!$server_info) {
            return $this->raiseError(null, null, null,
                'Could not get server information', __FUNCTION__);
        }
        // cache server_info
        $this->connected_server_info = $server_info;
        if (!$native) {
            $tmp = explode('.', $server_info, 3);
            if (isset($tmp[2]) && strpos($tmp[2], '-')) {
                $tmp2 = explode('-', @$tmp[2], 2);
            } else {
                $tmp2[0] = isset($tmp[2]) ? $tmp[2] : null;
                $tmp2[1] = null;
            }
            $server_info = array(
                'major' => isset($tmp[0]) ? $tmp[0] : null,
                'minor' => isset($tmp[1]) ? $tmp[1] : null,
                'patch' => $tmp2[0],
                'extra' => $tmp2[1],
                'native' => $server_info,
            );
        }
        return $server_info;
    }

    // }}}
    // {{{ prepare()

    /**
     * Prepares a query for multiple execution with execute().
     * With some database backends, this is emulated.
     * prepare() requires a generic query as string like
     * 'INSERT INTO numbers VALUES(?,?)' or
     * 'INSERT INTO numbers VALUES(:foo,:bar)'.
     * The ? and :[a-zA-Z] and  are placeholders which can be set using
     * bindParam() and the query can be send off using the execute() method.
     *
     * @param string $query the query to prepare
     * @param mixed   $types  array that contains the types of the placeholders
     * @param mixed   $result_types  array that contains the types of the columns in
     *                        the result set or MDB2_PREPARE_RESULT, if set to
     *                        MDB2_PREPARE_MANIP the query is handled as a manipulation query
     * @param mixed   $lobs   key (field) value (parameter) pair for all lob placeholders
     * @return mixed resource handle for the prepared query on success, a MDB2
     *        error on failure
     * @access public
     * @see bindParam, execute
     */
    function &prepare($query, $types = null, $result_types = null, $lobs = array())
    {
        if ($this->options['emulate_prepared']
            || $this->supported['prepared_statements'] !== true
        ) {
            $obj =& parent::prepare($query, $types, $result_types, $lobs);
            return $obj;
        }
        $is_manip = ($result_types === MDB2_PREPARE_MANIP);
        $offset = $this->offset;
        $limit = $this->limit;
        $this->offset = $this->limit = 0;
        $query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
        $result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));
        if ($result) {
            if (PEAR::isError($result)) {
                return $result;
            }
            $query = $result;
        }
        $placeholder_type_guess = $placeholder_type = null;
        $question = '?';
        $colon = ':';
        $positions = array();
        $position = 0;
        while ($position < strlen($query)) {
            $q_position = strpos($query, $question, $position);
            $c_position = strpos($query, $colon, $position);
            if ($q_position && $c_position) {
                $p_position = min($q_position, $c_position);
            } elseif ($q_position) {
                $p_position = $q_position;
            } elseif ($c_position) {
                $p_position = $c_position;
            } else {
                break;
            }
            if (is_null($placeholder_type)) {
                $placeholder_type_guess = $query[$p_position];
            }
            
            $new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);
            if (PEAR::isError($new_pos)) {
                return $new_pos;
            }
            if ($new_pos != $position) {
                $position = $new_pos;
                continue; //evaluate again starting from the new position
            }
            
            if ($query[$position] == $placeholder_type_guess) {
                if (is_null($placeholder_type)) {
                    $placeholder_type = $query[$p_position];
                    $question = $colon = $placeholder_type;
                }
                if ($placeholder_type == ':') {
                    $parameter = preg_replace('/^.{'.($position+1).'}([a-z0-9_]+).*$/si', '\\1', $query);
                    if ($parameter === '') {
                        $err =& $this->raiseError(MDB2_ERROR_SYNTAX, null, null,
                            'named parameter with an empty name', __FUNCTION__);
                        return $err;
                    }
                    $positions[$p_position] = $parameter;
                    $query = substr_replace($query, '?', $position, strlen($parameter)+1);
                } else {
                    $positions[$p_position] = count($positions);
                }
                $position = $p_position + 1;
            } else {
                $position = $p_position;
            }
        }
        $connection = $this->getConnection();
        if (PEAR::isError($connection)) {
            return $connection;
        }
        $statement_name = sprintf($this->options['statement_format'], $this->phptype, md5(time() + rand()));
        $query = "PREPARE $statement_name FROM ".$this->quote($query, 'text');
        $statement =& $this->_doQuery($query, true, $connection);
        if (PEAR::isError($statement)) {
            return $statement;
        }

        $class_name = 'MDB2_Statement_'.$this->phptype;
        $obj =& new $class_name($this, $statement_name, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);
        $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'post', 'result' => $obj));
        return $obj;
    }

    // }}}
    // {{{ replace()

    /**
     * Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
     * query, except that if there is already a row in the table with the same
     * key field values, the REPLACE query just updates its values instead of
     * inserting a new row.
     *
     * The REPLACE type of query does not make part of the SQL standards. Since
     * practically only MySQL implements it natively, this type of query is
     * emulated through this method for other DBMS using standard types of
     * queries inside a transaction to assure the atomicity of the operation.
     *
     * @access public
     *
     * @param string $table name of the table on which the REPLACE query will
     *  be executed.
     * @param array $fields associative array that describes the fields and the
     *  values that will be inserted or updated in the specified table. The
     *  indexes of the array are the names of all the fields of the table. The
     *  values of the array are also associative arrays that describe the
     *  values and other properties of the table fields.
     *
     *  Here follows a list of field properties that need to be specified:
     *
     *    value:
     *          Value to be assigned to the specified field. This value may be
     *          of specified in database independent type format as this
     *          function can perform the necessary datatype conversions.
     *
     *    Default:
     *          this property is required unless the Null property
     *          is set to 1.
     *
     *    type
     *          Name of the type of the field. Currently, all types Metabase
     *          are supported except for clob and blob.
     *
     *    Default: no type conversion
     *
     *    null
     *          Boolean property that indicates that the value for this field
     *          should be set to null.
     *
     *          The default value for fields missing in INSERT queries may be
     *          specified the definition of a table. Often, the default value
     *          is already null, but since the REPLACE may be emulated using
     *          an UPDATE query, make sure that all fields of the table are
     *          listed in this function argument array.
     *
     *    Default: 0
     *
     *    key
     *          Boolean property that indicates that this field should be
     *          handled as a primary key or at least as part of the compound
     *          unique index of the table that will determine the row that will
     *          updated if it exists or inserted a new row otherwise.
     *
     *          This function will fail if no key field is specified or if the
     *          value of a key field is set to null because fields that are
     *          part of unique index they may not be null.
     *
     *    Default: 0
     *
     * @return mixed MDB2_OK on success, a MDB2 error on failure
     */
    function replace($table, $fields)
    {
        $count = count($fields);
        $query = $values = '';
        $keys = $colnum = 0;
        for (reset($fields); $colnum < $count; next($fields), $colnum++) {
            $name = key($fields);
            if ($colnum > 0) {
                $query .= ',';
                $values.= ',';
            }
            $query.= $name;
            if (isset($fields[$name]['null']) && $fields[$name]['null']) {
                $value = 'NULL';
            } else {
                $type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
                $value = $this->quote($fields[$name]['value'], $type);
            }
            $values.= $value;
            if (isset($fields[$name]['key']) && $fields[$name]['key']) {
                if ($value === 'NULL') {
                    return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
                        'key value '.$name.' may not be NULL', __FUNCTION__);
                }
                $keys++;
            }
        }
        if ($keys == 0) {
            return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
                'not specified which fields are keys', __FUNCTION__);
        }

        $connection = $this->getConnection();
        if (PEAR::isError($connection)) {
            return $connection;
        }

        $query = "REPLACE INTO $table ($query) VALUES ($values)";
        $result =& $this->_doQuery($query, true, $connection);
        if (PEAR::isError($result)) {
            return $result;
        }
        return $this->_affectedRows($connection, $result);
    }

    // }}}
    // {{{ nextID()

    /**
     * Returns the next free id of a sequence
     *
     * @param string $seq_name name of the sequence
     * @param boolean $ondemand when true the sequence is
     *                          automatic created, if it
     *                          not exists
     *
     * @return mixed MDB2 Error Object or id
     * @access public
     */
    function nextID($seq_name, $ondemand = true)
    {
        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
        $seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
        $query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (NULL)";
        $this->expectError(MDB2_ERROR_NOSUCHTABLE);
        $result =& $this->_doQuery($query, true);
        $this->popExpect();
        if (PEAR::isError($result)) {
            if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
                $this->loadModule('Manager', null, true);
                $result = $this->manager->createSequence($seq_name);
                if (PEAR::isError($result)) {
                    return $this->raiseError($result, null, null,
                        'on demand sequence '.$seq_name.' could not be created', __FUNCTION__);
                } else {
                    return $this->nextID($seq_name, false);
                }
            }
            return $result;
        }
        $value = $this->lastInsertID();
        if (is_numeric($value)) {
            $query = "DELETE FROM $sequence_name WHERE $seqcol_name < $value";
            $result =& $this->_doQuery($query, true);
            if (PEAR::isError($result)) {
                $this->warnings[] = 'nextID: could not delete previous sequence table values from '.$seq_name;
            }
        }
        return $value;
    }

    // }}}
    // {{{ lastInsertID()

    /**
     * Returns the autoincrement ID if supported or $id or fetches the current
     * ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
     *
     * @param string $table name of the table into which a new row was inserted
     * @param string $field name of the field into which a new row was inserted
     * @return mixed MDB2 Error Object or id
     * @access public
     */
    function lastInsertID($table = null, $field = null)
    {
        // not using mysql_insert_id() due to http://pear.php.net/bugs/bug.php?id=8051
        return $this->queryOne('SELECT LAST_INSERT_ID()', 'integer');
    }

    // }}}
    // {{{ currID()

    /**
     * Returns the current id of a sequence
     *
     * @param string $seq_name name of the sequence
     * @return mixed MDB2 Error Object or id
     * @access public
     */
    function currID($seq_name)
    {
        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
        $seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
        $query = "SELECT MAX($seqcol_name) FROM $sequence_name";
        return $this->queryOne($query, 'integer');
    }
}

/**
 * MDB2 MySQL result driver