public String getConnectionID() {
        return connectionID;
    }
Returns the connection ID of the in-progress connection as determined by
guacd, not to be confused with the connection identifier determined by
the database. This is the ID that must be supplied to guacd if joining
this connection. If the in-progress connection is joining another
connection, this will be the ID of the connection being joined, NOT the
ID of the connection directly represented by this record.

@return
    The ID of the in-progress connection, as determined by guacd.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/tunnel/ActiveConnectionRecord.java