The SqlEngine class represents a SQL engine that performs SQL queries on an eXtremeDB database, either local or remote (or distributed). It provides the following methods:
open(params) Open the database and create SqlEngine using the parameters specified in an instance of exdb class SqlOpenParameters
registerFunction(return_type, function_name, function, n_arguments) Register a function to be accessible to this SqlEngine
unregisterFunction(function_name) Unregister the function from this SqlEngine