aRTquerier {aRT} | R Documentation

## Class aRTquerier

### Description

Class that manipulates the result of a database query. It returns the objects one by one, and can slide a temporal `aRTtheme`.

### Objects from the Class

Objects can be created by calling `openQuerier()` from `aRTlayer` or from `aRTtheme`.

### Extends

Class `aRTcomponent`, directly.

### Methods

getData:
  Returns the next element of the query result in the actual slide.
nextFrame:
  Loads the next frame, if there is a temporal sliding. A temporal query needs to load one slide before using `getData` for getting its elements. Non-temporal queries can't use this function. Note that you can do a non-temporal query in a temporal layer.

### Author(s)

Pedro Ribeiro de Andrade

[Package aRT version 1.7-1 Index]