Add `AppendRows` helper

rows.go

@@ -417,12 +417,10 @@ type CollectableRow interface {
 // RowToFunc is a function that scans or otherwise converts row to a T.
 type RowToFunc[T any] func(row CollectableRow) (T, error)
 
-// CollectRows iterates through rows, calling fn for each row, and collecting the results into a slice of T.
+// AppendRows iterates through rows, calling fn for each row, and appending the results into a slice of T.
-func CollectRows[T any](rows Rows, fn RowToFunc[T]) ([]T, error) {
+func AppendRows[T any, S ~[]T](slice S, rows Rows, fn RowToFunc[T]) (S, error) {
 	defer rows.Close()
 
-	slice := []T{}
-
 	for rows.Next() {
 		value, err := fn(rows)
 		if err != nil {
@@ -438,6 +436,11 @@ func CollectRows[T any](rows Rows, fn RowToFunc[T]) ([]T, error) {
 	return slice, nil
 }
 
+// CollectRows iterates through rows, calling fn for each row, and collecting the results into a slice of T.
+func CollectRows[T any](rows Rows, fn RowToFunc[T]) ([]T, error) {
+	return AppendRows([]T(nil), rows, fn)
+}
+
 // CollectOneRow calls fn for the first row in rows and returns the result. If no rows are found returns an error where errors.Is(ErrNoRows) is true.
 // CollectOneRow is to CollectRows as QueryRow is to Query.
 func CollectOneRow[T any](rows Rows, fn RowToFunc[T]) (T, error) {