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
the dbIsValid() generic instead.
Usage
isIdCurrent(obj)
# S4 method for MySQLDriver
dbIsValid(dbObj)
# S4 method for MySQLConnection
dbIsValid(dbObj)
# S4 method for MySQLResult
dbIsValid(dbObj)
Value
a logical scalar.
Arguments
dbObj, obj
A MysqlDriver, MysqlConnection,
MysqlResult.
Details
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
be contacted.