Check if a connection to a DBMS can be established
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.
dbCanConnect(drv, ...)
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 |
A scalar logical. If FALSE, the "reason" attribute indicates
a reason for failure.
Other DBIDriver generics:
DBIDriver-class,
dbConnect(),
dbDataType(),
dbDriver(),
dbGetInfo(),
dbIsReadOnly(),
dbIsValid(),
dbListConnections()
# 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:")
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