content {PivotalR} | R Documentation |
db.obj
object
A db.data.frame
object's content is the table/view name that it
points to. A db.Rquery
object's content is the SQL query that
represents the operations applied on an existing
db.data.frame
. This function is mainly for debugging. Normal
user who is not familiar with SQL does not need to use it.
content(x)
x |
A |
A string, the content of db.obj
object x
. A
db.data.frame
object's content is the table/view name that it
points to. A db.Rquery
object's content is the SQL query that
represents the operations applied on an existing db.data.frame
.
Author: Predictive Analytics Team at Pivotal Inc.
Maintainer: Frank McQuillan, Pivotal Inc. fmcquillan@pivotal.io
db.obj
, db.data.frame
,
db.table
, db.view
,
db.Rquery
explain the definitions of the class
hierarchy of this package.
## Not run: ## set up the database connection ## Assume that .port is port number and .dbname is the database name cid <- db.connect(port = .port, dbname = .dbname, verbose = FALSE) delete("abalone", conn.id = cid) y <- as.db.data.frame(abalone, "abalone", conn.id = cid) # create a table x <- db.data.frame("abalone", conn.id = cid, key = "id") ## actually, x and y are pointing the same table eql(x, y) # returns TRUE content(x) content(x$id) content(x$id < 10) content(x[,1:5]) content(x == y) # this is different from eql(x, y) content(sort(x, INDICES = x$id)) content(x[x$id<10,]) content(x[1:10,]) content(colSums(x)) content(by(x, NULL, sum)) content(by(x, x$sex, sum)) db.disconnect(cid, verbose = FALSE) ## End(Not run)