Support function that verifies that an object holding a reference to a
foreign object is still valid for communicating with the RDBMS.
isIdCurrent will be deprecated in the near future; please use
dbIsValid() generic instead.
isIdCurrent(obj) ## S4 method for signature 'MySQLDriver' dbIsValid(dbObj) ## S4 method for signature 'MySQLConnection' dbIsValid(dbObj) ## S4 method for signature 'MySQLResult' dbIsValid(dbObj)
dbObjects are R/S-Plus remote references to foreign objects. This
introduces differences to the object's semantics such as persistence (e.g.,
connections may be closed unexpectedly), thus this function provides a
minimal verification to ensure that the foreign object being referenced can
a logical scalar.
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