View source: R/ds.testObjExists.R
ds.testObjExists | R Documentation |
This function checks that a specified data object exists or has been correctly created on a specified set of data servers.
ds.testObjExists(test.obj.name = NULL, datasources = NULL)
test.obj.name |
a character string specifying the name of the object to search. |
datasources |
a list of |
Close copies of the code in this function
are embedded into other functions that create an object and you then wish to test whether it has successfully
been created e.g. ds.make
or ds.asFactor
.
Server function called: testObjExistsDS
ds.testObjExists
returns a list of messages specifying that the object exists
on the server-side.
If the specified object does not exist in at least one
of the specified data sources or it exists but is of
class NULL, the function returns an error message specifying that
the object does not exist in all data sources.
DataSHIELD Development Team
## Not run:
## Version 6, for version 5 see the Wiki
# connecting to the Opal servers
require('DSI')
require('DSOpal')
require('dsBaseClient')
builder <- DSI::newDSLoginBuilder()
builder$append(server = "study1",
url = "http://192.168.56.100:8080/",
user = "administrator", password = "datashield_test&",
table = "CNSIM.CNSIM1", driver = "OpalDriver")
builder$append(server = "study2",
url = "http://192.168.56.100:8080/",
user = "administrator", password = "datashield_test&",
table = "CNSIM.CNSIM2", driver = "OpalDriver")
builder$append(server = "study3",
url = "http://192.168.56.100:8080/",
user = "administrator", password = "datashield_test&",
table = "CNSIM.CNSIM3", driver = "OpalDriver")
logindata <- builder$build()
connections <- DSI::datashield.login(logins = logindata, assign = TRUE, symbol = "D")
#Check if D object exists on the server-side
ds.testObjExists(test.obj.name = "D",
datasources = connections)
# Clear the Datashield R sessions and logout
datashield.logout(connections)
## End(Not run)
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