dbApply-methods | R Documentation |
Applies R/S-Plus functions to groups of remote DBMS rows without bringing an entire result set all at once. The result set is expected to be sorted by the grouping field.
a PostgreSQL result set (see dbSendQuery
).
any additional arguments to be passed to FUN
.
See the Database Interface definition document
DBI.pdf
in the base directory of this package
or
https://cran.r-project.org/package=DBI.
PostgreSQL
postgresqlDBApply
dbSendQuery
fetch
## Not run: ## compute quanitiles for each network agent con <- dbConnect(PostgreSQL(), user="user", password="passwd",dbname="dbname") rs <- dbSendQuery(con, "select Agent, ip_addr, DATA from pseudo_data order by Agent") out <- dbApply(rs, INDEX = "Agent", FUN = function(x, grp) quantile(x$DATA, names=FALSE)) ## End(Not run)
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