dbCanConnect {DBI}

Check if a connection to a DBMS can be established

Description

Like dbConnect(), but only checks validity without actually returning a connection object. The default implementation opens a connection and disconnects on success, but individual backends might implement a lighter-weight check.

Usage

dbCanConnect(drv, ...)

Arguments

drv

an object that inherits from DBIDriver, or an existing DBIConnection object (in order to clone an existing connection).

...

authentication arguments needed by the DBMS instance; these typically include user, password, host, port, dbname, etc. For details see the appropriate DBIDriver.

Value

A scalar logical. If FALSE, the "reason" attribute indicates a reason for failure.

See Also

Other DBIDriver generics: DBIDriver-class, dbConnect(), dbDataType(), dbDriver(), dbGetInfo(), dbIsReadOnly(), dbIsValid(), dbListConnections()

Examples

# SQLite only needs a path to the database. (Here, ":memory:" is a special
# path that creates an in-memory database.) Other database drivers
# will require more details (like user, password, host, port, etc.)
dbCanConnect(RSQLite::SQLite(), ":memory:")