func newResult(res *C.PGresult) *driverRows {
ncols := int(C.PQnfields(res))
nrows := int(C.PQntuples(res))
result := &driverRows{res: res, nrows: nrows, currRow: -1, ncols: ncols, cols: nil}
runtime.SetFinalizer(result, (*driverRows).Close)
return result
}
func newResult(res *C.PGresult) *Result {
ncols := int(C.PQnfields(res))
nrows := int(C.PQntuples(res))
result := &Result{res: res, nrows: nrows, currRow: -1, ncols: ncols, cols: nil}
runtime.SetFinalizer(result, (*Result).Clear)
return result
}
func (s *libpqStmt) Query(args []driver.Value) (driver.Rows, error) {
// execute prepared statement
cres, err := s.exec(args)
if err != nil {
return nil, err
}
// check to see if this was a "LISTEN"
if C.GoString(C.PQcmdStatus(cres)) == "LISTEN" {
C.PQclear(cres)
return &libpqListenRows{s.c}, nil
}
return &libpqRows{
s: s,
res: cres,
ncols: int(C.PQnfields(cres)),
nrows: int(C.PQntuples(cres)),
currRow: 0,
cols: nil,
}, nil
}
func next(r *PgRows, dest []driver.Value) error {
if r.cur >= int(C.PQntuples(r.result)) {
return io.EOF
}
// TODO: cache oids
// TODO: extendibility
for i := 0; i < len(dest); i++ {
if 0 == int(C.PQgetisnull(r.result, C.int(r.cur), C.int(i))) {
oid := int(C.PQftype(r.result, C.int(i)))
data := C.PQgetvalue(r.result, C.int(r.cur), C.int(i))
length := C.PQgetlength(r.result, C.int(r.cur), C.int(i))
var err error
dest[i], err = typecast(oid, data, length, r)
if err != nil {
return err
}
} else {
dest[i] = nil
}
}
r.cur++
return nil
}