Fix Values when there is a null

query.go

@@ -258,6 +258,11 @@ func (rows *Rows) Values() ([]interface{}, error) {
 	for _, _ = range rows.fields {
 		vr, _ := rows.nextColumn()
 
+		if vr.Len() == -1 {
+			values = append(values, nil)
+			continue
+		}
+
 		switch vr.Type().DataType {
 		case BoolOid:
 			values = append(values, decodeBool(vr))

query_test.go

@@ -50,7 +50,7 @@ func TestConnQueryValues(t *testing.T) {
 
 	var rowCount int32
 
-	rows, err := conn.Query("select 'foo', n from generate_series(1,$1) n", 10)
+	rows, err := conn.Query("select 'foo', n, null from generate_series(1,$1) n", 10)
 	if err != nil {
 		t.Fatalf("conn.Query failed: ", err)
 	}
@@ -63,8 +63,8 @@ func TestConnQueryValues(t *testing.T) {
 		if err != nil {
 			t.Fatalf("rows.Values failed: %v", err)
 		}
-		if len(values) != 2 {
-			t.Errorf("Expected rows.Values to return 2 values, but it returned %d", len(values))
+		if len(values) != 3 {
+			t.Errorf("Expected rows.Values to return 3 values, but it returned %d", len(values))
 		}
 		if values[0] != "foo" {
 			t.Errorf(`Expected values[0] to be "foo", but it was %v`, values[0])
@@ -76,6 +76,10 @@ func TestConnQueryValues(t *testing.T) {
 		if values[1] != rowCount {
 			t.Errorf(`Expected values[1] to be %d, but it was %d`, rowCount, values[1])
 		}
+
+		if values[2] != nil {
+			t.Errorf(`Expected values[2] to be %d, but it was %d`, nil, values[2])
+		}
 	}
 
 	if rows.Err() != nil {