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* The {{Code|execute()}} method is called to launch a database command. It returns the result or throws an exception with the received error message.
* The {{Code|query()}} method creates a query instance. Variables and the context item can be bound to that object, and the result can either be requested via {{Code|execute()}}, or in an iterative manner with the {{Code|more()}} and {{Code|next()}} functions. If an error occurs, an exception will be thrown.
* The {{Code|create()}}, {{Code|add()}}, {{Code|replace()}} and {{Code|store()}} method pass on input streams to the corresponding database commands.
