vAttachDatabase: Add a database table to a GRASS attribute table
In fasterRaster: Faster Raster and Spatial Vector Processing Using 'GRASS GIS'

.vAttachDatabase

R Documentation

Add a database table to a GRASS attribute table

Description

.vAttachDatabase() adds a table to a GRASS vector. This table is meant to be "invisible" to most users–they should use interact with attribute tables using the GVector slot ⁠@table⁠. Some functions require tables (e.g., extract() and spatSample()). This function is mostly of use to developers.

Usage

.vAttachDatabase(x, table = NULL, replace = TRUE, cats = NULL)

Arguments

`x`	A `GVector` or the name of a vector in GRASS.
`table`	Either `NULL` (default), or a `data.frame` or `data.table`, or a numeric or integer vector: If `NULL`, then a bare minimal table will be created with a column named `cat`, holding sequential integer values. If a `data.frame` or `data.table` and no column is named `cat`, one will be created with sequential integer values. If the table does have a column named `cat`, then it should have integer (not just numeric) values. If a `vector`, then these are coerced to type `integer` and used to define the `cat` column. There should be one row/value per geometry in `x`.
`replace`	Logical: If `TRUE`, replace the existing database connection.
`cats`	Either `NULL` (default), or an integer vector: This is provided as a means to save time by passing `cats` to this function if it has already been generated by a calling function.