Check whether a database handle object is valid or not

Support function that verifies that an object holding a reference to a foreign object is still valid for communicating with the RDBMS

Usage

isPostgresqlIdCurrent(obj)

Arguments

obj

any dbObject (e.g., dbDriver, dbConnection, dbResult).

Value

a logical scalar.

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.

See also

dbDriver dbConnect dbSendQuery fetch

Examples

if (FALSE) { # \dontrun{
cursor <- dbSendQuery(con, sql.statement)
isIdCurrent(cursor)
} # }