dsAggregate-OpalConnection-method: Aggregate data

In datashield/DSOpal: 'DataSHIELD' Implementation for 'Opal'

Aggregate data

Description

Aggregate some data from the DataSHIELD R session using a valid R expression. The aggregation expression must satisfy the data repository's DataSHIELD configuration.

Usage

## S4 method for signature 'OpalConnection'
dsAggregate(conn, expr, async = TRUE)

Arguments

conn	OpalConnection-class object.
expr	Expression to evaluate.
async	Whether the result of the call should be retrieved asynchronously. When TRUE (default) the calls are parallelized over the connections, when the connection supports that feature, with an extra overhead of requests.

Examples

## Not run: 
con <- dbConnect(DSOpal::Opal(), "username", "password", "https://opal.example.org")
dsAssignTable(con, "D", "test.CNSIM")
dsAggregate(con, as.symbol("meanDS(D$WEIGHT)"))
dsDisconnect(con)

## End(Not run)

datashield/DSOpal documentation built on Oct. 11, 2022, 2:49 a.m.