View source: R/download_resources.R
fhir_next_bundle_url | R Documentation |
fhir_next_bundle_url() gives the link to the next available bundle, either of the bundle
you provided in the argument bundle
or of the last call to fhir_search()
, if bundle=NULL
(the default).
This function is useful when you don't have a lot of memory available or when a download of bundles was
interrupted for some reason. In case of small memory, you can use fhir_next_bundle_url
together with the
max_bundle
argument from fhir_search()
to download bundles in smaller batches in a loop.
See details in the example.
fhir_next_bundle_url(bundle = NULL)
bundle |
The bundle from which you wish to extract the next link. If this is |
A fhir_url object referencing next bundle available on the FHIR server. Empty fhir_url / character vector, if no further bundle is available.
#' #the try({}, silent = TRUE) statement is only there to catch errors when the server is down #you can skip it when the server is reachable try({ # workflow for small memory environments, downloading small batches of bundles # for really small memory environments consider also using the `_count` option in # your FHIR search request. # You can iteratively download, crack and save the bundles until all bundles are processed or the # desired number of bundles is reached. url <- fhir_url("https://server.fire.ly/Patient") count <- 0 obs <- fhir_table_description(resource = "Patient") design <- fhir_design(obs) while(length(url)>0 && count < 5){ bundles <- fhir_search(url, max_bundles = 2) tables <- fhir_crack(bundles, design) save(tables, file = paste0(tempdir(),"/table_", count, ".RData")) count <- count + 1 url <- fhir_next_bundle_url() } #you can see the saved tables here: dir(tempdir()) }, silent = TRUE)
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