mysql.php

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            if ($this->_changed_db) {
                if (!@mysql_select_db($this->_changed_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()

    /**
     * Roll back (undo) the current transaction.
     */
    function rollback()
    {
        if ($this->transaction_opcount > 0) {
            if ($this->_changed_db) {
                if (!@mysql_select_db($this->_changed_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()

    /**
     * Gets the number of rows affected by the data manipulation
     * query.  For other queries, this function returns 0.
     *
     * @return number of rows affected by the last query
     */

    function affectedRows()
    {
        if (DB::isManip($this->last_query)) {
            $result = @mysql_affected_rows($this->connection);
        } else {
            $result = 0;
        }
        return $result;
     }

    // }}}
    // {{{ errorNative()

    /**
     * Get the native error code of the last error (if any) that
     * occured on the current connection.
     *
     * @access public
     *
     * @return int native MySQL error code
     */

    function errorNative()
    {
        return mysql_errno($this->connection);
    }

    // }}}
    // {{{ nextId()

    /**
     * Get the next value in a sequence.  We emulate sequences
     * for MySQL.  Will create the sequence if it does not exist.
     *
     * @access public
     *
     * @param $seq_name the name of the sequence
     *
     * @param $ondemand whether to create the sequence table on demand
     * (default is true)
     *
     * @return a sequence integer, or a DB error
     */
    function nextId($seq_name, $ondemand = true)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        $repeat = 0;
        do {
            // XXX HACK: temporarily force error mode to "return"
            $tmp = $this->_default_error_mode;
            $this->_default_error_mode = PEAR_ERROR_RETURN;
            $result = $this->query("UPDATE ${sqn}_seq ".
                                   'SET id=LAST_INSERT_ID(id+1)');
            $this->_default_error_mode = $tmp;
            if ($ondemand && DB::isError($result) &&
                $result->getCode() == DB_ERROR_NOSUCHTABLE) {
                $repeat = 1;
                $result = $this->createSequence($seq_name);
                // Since createSequence initializes the ID to be 1,
                // we do not need to retrieve the ID again (or we will get 2)
                if (DB::isError($result)) {
                    return $result;
                } else {
                    // First ID of a newly created sequence is 1
                    return 1;
                }
            } elseif (DB::isError($result) &&
                $result->getCode() == DB_ERROR_ALREADY_EXISTS) {
                // Must be using old sequence emulation implementation,
                // we need to clean up the dupes.

                // 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 = $this->getOne("SELECT GET_LOCK('${sqn}_seq_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(1100);
                }

                $highest_id = $this->getOne("SELECT MAX(id) FROM ${sqn}_seq");
                if (DB::isError($highest_id)) {
                    return $highest_id;
                }
                // 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 ${sqn}_seq ".
                                       "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 = $this->getOne("SELECT RELEASE_LOCK('${sqn}_seq_lock')");
                if (DB::isError($result)) {
                    return $result;
                }

                // This should kill all rows except the highest, now we
                // can try again
                $repeat = 1;
            } else {
                $repeat = 0;
            }
        } while ($repeat);
        if (DB::isError($result)) {
            return $result;
        }
        return mysql_insert_id($this->connection);
    }

    // }}}
    // {{{ createSequence()

    function createSequence($seq_name)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        $res = $this->query("CREATE TABLE ${sqn}_seq ".
                            '(id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'.
                            ' PRIMARY KEY(id))');
        if (DB::isError($res)) {
            return $res;
        }
        // insert yields value 1, nextId call will generate ID 2
        return $this->query("INSERT INTO ${sqn}_seq VALUES(0)");
    }

    // }}}
    // {{{ dropSequence()

    function dropSequence($seq_name)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        return $this->query("DROP TABLE ${sqn}_seq");
    }

    // }}}
    // {{{ quote()
    /**
    * Quote the given string so it can be safely used within string delimiters
    * in a query.
    * @param $string mixed Data to be quoted
    * @return mixed "NULL" string, quoted string or original data
    */
    function quote($str = null)
    {
        switch (strtolower(gettype($str))) {
            case 'null':
                return 'NULL';
            case 'integer':
                return $str;
            case 'string':
            default:
                return "'".mysql_escape_string($str)."'";
        }
    }
    // }}}
    // {{{ modifyQuery()

    function modifyQuery($query, $subject = null)
    {
        if ($this->options['optimize'] == 'portability') {
            // "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()

    function modifyLimitQuery($query, $from, $count)
    {
        $query = $query . " LIMIT $from, $count";
        return $query;
    }

    // }}}
    // {{{ mysqlRaiseError()

    function mysqlRaiseError($errno = null)
    {
        if ($errno === null) {
            $errno = $this->errorCode(mysql_errno($this->connection));
        }
        return $this->raiseError($errno, null, null, null,
                        @mysql_error($this->connection));
    }

    // }}}
    // {{{ tableInfo()

    function tableInfo($result, $mode = null) {
        $count = 0;
        $id    = 0;
        $res   = array();

        /*
         * depending on $mode, metadata returns the following values:
         *
         * - mode is false (default):
         * $result[]:
         *   [0]["table"]  table name
         *   [0]["name"]   field name
         *   [0]["type"]   field type
         *   [0]["len"]    field length
         *   [0]["flags"]  field flags
         *
         * - mode is DB_TABLEINFO_ORDER
         * $result[]:
         *   ["num_fields"] number of metadata records
         *   [0]["table"]  table name
         *   [0]["name"]   field name
         *   [0]["type"]   field type
         *   [0]["len"]    field length
         *   [0]["flags"]  field flags
         *   ["order"][field name]  index of field named "field name"
         *   The last one is used, if you have a field name, but no index.
         *   Test:  if (isset($result['meta']['myfield'])) { ...
         *
         * - mode is DB_TABLEINFO_ORDERTABLE
         *    the same as above. but additionally
         *   ["ordertable"][table name][field name] index of field
         *      named "field name"
         *
         *      this is, because if you have fields from different
         *      tables with the same field name * they override each
         *      other with DB_TABLEINFO_ORDER
         *
         *      you can combine DB_TABLEINFO_ORDER and
         *      DB_TABLEINFO_ORDERTABLE with DB_TABLEINFO_ORDER |
         *      DB_TABLEINFO_ORDERTABLE * or with DB_TABLEINFO_FULL
         */

        // if $result is a string, then we want information about a
        // table without a resultset
        if (is_string($result)) {
            $id = @mysql_list_fields($this->dsn['database'],
                                     $result, $this->connection);
            if (empty($id)) {
                return $this->mysqlRaiseError();
            }
        } else { // else we want information about a resultset
            $id = $result;
            if (empty($id)) {
                return $this->mysqlRaiseError();
            }
        }

        $count = @mysql_num_fields($id);

        // made this IF due to performance (one if is faster than $count if's)
        if (empty($mode)) {
            for ($i=0; $i<$count; $i++) {
                $res[$i]['table'] = @mysql_field_table ($id, $i);
                $res[$i]['name']  = @mysql_field_name  ($id, $i);
                $res[$i]['type']  = @mysql_field_type  ($id, $i);
                $res[$i]['len']   = @mysql_field_len   ($id, $i);
                $res[$i]['flags'] = @mysql_field_flags ($id, $i);
            }
        } else { // full
            $res['num_fields']= $count;

            for ($i=0; $i<$count; $i++) {
                $res[$i]['table'] = @mysql_field_table ($id, $i);
                $res[$i]['name']  = @mysql_field_name  ($id, $i);
                $res[$i]['type']  = @mysql_field_type  ($id, $i);
                $res[$i]['len']   = @mysql_field_len   ($id, $i);
                $res[$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 (is_string($result)) {
            @mysql_free_result($id);
        }
        return $res;
    }

    // }}}
    // {{{ getTablesQuery()

    /**
    * Returns the query needed to get some backend info
    * @param string $type What kind of info you want to retrieve
    * @return string The SQL query string
    */
    function getSpecialQuery($type)
    {
        switch ($type) {
            case 'tables':
                $sql = "SHOW TABLES";
                break;
            case 'views':
                return DB_ERROR_NOT_CAPABLE;
            case 'users':
                $sql = "select distinct User from user";
                if($this->dsn['database'] != 'mysql') {
                    $dsn = $this->dsn;
                    $dsn['database'] = 'mysql';
                    if (DB::isError($db = DB::connect($dsn))) {
                        return $db;
                    }
                    $sql = $db->getCol($sql);
                    $db->disconnect();
                    // XXX Fixme the mysql driver should take care of this
                    if (!@mysql_select_db($this->dsn['database'], $this->connection)) {
                        return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
                    }
                }
                return $sql;
                break;
            case 'databases':
                $sql = "SHOW DATABASES";
                break;
            default:
                return null;
        }
        return $sql;
    }

    // }}}

    // TODO/wishlist:
    // longReadlen
    // binmode
}

?>