aRTdb {aRT}R Documentation

Class aRTdb

Description

Class that manipulates a database. Data is stored in layers (geometries and their attributes) or external tables (attributes not directly connected to any geometry). aRTdb objects use more memory than any other object of this package because it stores the definitions of all themes, layers, and tables. Objects of these three classes store only a pointer to its “father”, the database. We recommend to work with only one object of this class per time.

Objects from the Class

Objects can be created by using createDb or openDb, methods of aRTconn.

Extends

Class aRTcomponent, directly.

Methods

createLayer:
Creates a new layer returns it.
createTable:
Creates an empty table in the database.
createView:
Creates an empty View in the database.
deleteLayer:
Deletes a layer of the database.
deleteTable:
Deletes a table of the database.
deleteTheme:
Deletes a theme of the database.
deleteView:
Deletes a view in the database.
importMif:
Imports a MID/MIF file to the database.
importShape:
Imports a shapefile to the database.
importSpData:
Imports data in the sp format to the database.
importTable:
Imports a data.frame to a database table.
openLayer:
Opens an existent layer.
openTheme:
Opens an existent theme. (Themes can be created only from layers.)
reload:
Reloads the data about themes and layers. It is useful when something has been changed from outside R.
showLayers:
Shows all the available layers.
showThemes:
Shows all the available themes.
showViews:
Show all the available views.
summary:
Returns some information about the database.

Author(s)

Marcos Aurelio Carrero, Pedro Ribeiro de Andrade

See Also

See aRTdb-METHOD for a method of this class or CLASSNAME-class for links to other classes.


[Package aRT version 1.6-1 Index]