R/get_veg_other_from_MT_veg_db.R

In ncss-tech/soilDB: Soil Database Interface

#' Get cover composition data from a Montana RangeDB database
#' 
#' Get cover composition data from a Montana RangeDB database.
#' 
#' @param dsn The name of the Montana RangeDB front-end database connection
#' (see details).
#' @return A data.frame.
#' @author Jay M. Skovlin
#' @seealso \code{\link{get_veg_from_MT_veg_db}},
#' \code{\link{get_veg_species_from_MT_veg_db}}
#' @keywords manip
#' @export get_veg_other_from_MT_veg_db
get_veg_other_from_MT_veg_db <- function(dsn) {
  # must have odbc installed
  if(!requireNamespace('odbc'))
    stop('please install the `odbc` package', call.=FALSE)
  
	#pull site and plot data and total production value
	q <- "SELECT tblESD_DK.PlotKey, tblESD_DK.DKKey, tblSites.SiteID AS site_id, tblESD_DK.SpeciesSymbol, tblESD_DK.LPIPercentBasal, tblESD_DK.CanopyCoverPercent
FROM tblSites LEFT JOIN ((tblPlots LEFT JOIN tblESD_DK ON tblPlots.PlotKey = tblESD_DK.PlotKey) LEFT JOIN (SELECT * FROM tblSpecies)  AS Spec ON tblESD_DK.SpeciesSymbol = Spec.SpeciesCode) ON tblSites.SiteKey = tblPlots.SiteKey
	WHERE (((tblESD_DK.PlotKey) Is Not Null) AND ((tblESD_DK.SpeciesSymbol) Like 'shrub canopy' Or (tblESD_DK.SpeciesSymbol) Like 'tree canopy' Or (tblESD_DK.SpeciesSymbol) Like 'bare ground' Or (tblESD_DK.SpeciesSymbol) Like 'rock or logs' Or (tblESD_DK.SpeciesSymbol) Like 'clubmoss' Or (tblESD_DK.SpeciesSymbol) Like 'basal vegetation') AND ((tblESD_DK.DKClass) Is Null))
	ORDER BY tblESD_DK.PlotKey, tblESD_DK.SpeciesSymbol;"

	# setup connection to our pedon database
	channel <- dbConnect(odbc::odbc(), .connection_string = paste0("Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=", dsn))
	
	# exec query
	d <- DBI::dbGetQuery(channel, q)
	
	# close connection
	DBI::dbDisconnect(channel)
	
	# done
	return(d)
}