# S4 method for PqResult
dbColumnInfo(res, ...)# S4 method for PqResult
dbGetRowCount(res, ...)
# S4 method for PqResult
dbGetRowsAffected(res, ...)
# S4 method for PqResult
dbGetStatement(res, ...)
# S4 method for PqDriver
dbIsValid(dbObj, ...)
# S4 method for PqResult
dbIsValid(dbObj, ...)