RPostgreSQL (version 0.7-5)

isPostgresqlIdCurrent: Check whether a database handle object is valid or not

Description

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)

Value

a logical scalar.

Arguments

obj

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

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) {
cursor <- dbSendQuery(con, sql.statement)
isIdCurrent(cursor)
}