Add additional methods to Batch similar to what exists on Queryx

batchx.go

@@ -1,6 +1,8 @@
 package gocqlx
 
 import (
+	"fmt"
+
 	"github.com/gocql/gocql"
 )
 
@@ -27,6 +29,38 @@ func (b *Batch) BindStruct(qry *Queryx, arg interface{}) error {
 	return nil
 }
 
+// Bind binds query parameters to values from args.
+// If value cannot be found an error is reported.
+func (b *Batch) Bind(qry *Queryx, args ...interface{}) error {
+	if len(qry.Names) != len(args) {
+		return fmt.Errorf("query requires %d arguments, but %d provided", len(qry.Names), len(args))
+	}
+	b.Query(qry.Statement(), args...)
+	return nil
+}
+
+// BindMap binds query named parameters to values from arg using a mapper.
+// If value cannot be found an error is reported.
+func (b *Batch) BindMap(qry *Queryx, arg map[string]interface{}) error {
+	args, err := qry.bindMapArgs(arg)
+	if err != nil {
+		return err
+	}
+	b.Query(qry.Statement(), args...)
+	return nil
+}
+
+// BindStructMap binds query named parameters to values from arg0 and arg1 using a mapper.
+// If value cannot be found an error is reported.
+func (b *Batch) BindStructMap(qry *Queryx, arg0 interface{}, arg1 map[string]interface{}) error {
+	args, err := qry.bindStructArgs(arg0, arg1)
+	if err != nil {
+		return err
+	}
+	b.Query(qry.Statement(), args...)
+	return nil
+}
+
 // ExecuteBatch executes a batch operation and returns nil if successful
 // otherwise an error describing the failure.
 func (s *Session) ExecuteBatch(batch *Batch) error {

batchx_test.go

@@ -52,32 +52,112 @@ func TestBatch(t *testing.T) {
 		SongID: mustParseUUID("60fc234a-8481-4343-93bb-72ecab404863"),
 	}
 
+	t.Run("batch inserts", func(t *testing.T) {
+		t.Parallel()
+
+		tcases := []struct {
+			name           string
+			methodSong     func(*gocqlx.Batch, *gocqlx.Queryx, Song) error
+			methodPlaylist func(*gocqlx.Batch, *gocqlx.Queryx, PlaylistItem) error
+		}{
+			{
+				name: "BindStruct",
+				methodSong: func(b *gocqlx.Batch, q *gocqlx.Queryx, song Song) error {
+					return b.BindStruct(q, song)
+				},
+				methodPlaylist: func(b *gocqlx.Batch, q *gocqlx.Queryx, playlist PlaylistItem) error {
+					return b.BindStruct(q, playlist)
+				},
+			},
+			{
+				name: "BindMap",
+				methodSong: func(b *gocqlx.Batch, q *gocqlx.Queryx, song Song) error {
+					return b.BindMap(q, map[string]interface{}{
+						"id":     song.ID,
+						"title":  song.Title,
+						"album":  song.Album,
+						"artist": song.Artist,
+						"tags":   song.Tags,
+						"data":   song.Data,
+					})
+				},
+				methodPlaylist: func(b *gocqlx.Batch, q *gocqlx.Queryx, playlist PlaylistItem) error {
+					return b.BindMap(q, map[string]interface{}{
+						"id":      playlist.ID,
+						"title":   playlist.Title,
+						"album":   playlist.Album,
+						"artist":  playlist.Artist,
+						"song_id": playlist.SongID,
+					})
+				},
+			},
+			{
+				name: "Bind",
+				methodSong: func(b *gocqlx.Batch, q *gocqlx.Queryx, song Song) error {
+					return b.Bind(q, song.ID, song.Title, song.Album, song.Artist, song.Tags, song.Data)
+				},
+				methodPlaylist: func(b *gocqlx.Batch, q *gocqlx.Queryx, playlist PlaylistItem) error {
+					return b.Bind(q, playlist.ID, playlist.Title, playlist.Album, playlist.Artist, playlist.SongID)
+				},
+			},
+			{
+				name: "BindStructMap",
+				methodSong: func(b *gocqlx.Batch, q *gocqlx.Queryx, song Song) error {
+					in := map[string]interface{}{
+						"title": song.Title,
+						"album": song.Album,
+					}
+					return b.BindStructMap(q, struct {
+						ID     gocql.UUID
+						Artist string
+						Tags   []string
+						Data   []byte
+					}{
+						ID:     song.ID,
+						Artist: song.Artist,
+						Tags:   song.Tags,
+						Data:   song.Data,
+					}, in)
+				},
+				methodPlaylist: func(b *gocqlx.Batch, q *gocqlx.Queryx, playlist PlaylistItem) error {
+					in := map[string]interface{}{
+						"title": playlist.Title,
+						"album": playlist.Album,
+					}
+					return b.BindStructMap(q, struct {
+						ID     gocql.UUID
+						Artist string
+						SongID gocql.UUID
+					}{
+						ID:     playlist.ID,
+						Artist: playlist.Artist,
+						SongID: playlist.SongID,
+					},
+						in,
+					)
+				},
+			},
+		}
+		for _, tcase := range tcases {
+			t.Run(tcase.name, func(t *testing.T) {
 				insertSong := qb.Insert("batch_test.songs").
 					Columns("id", "title", "album", "artist", "tags", "data").Query(session)
 				insertPlaylist := qb.Insert("batch_test.playlists").
 					Columns("id", "title", "album", "artist", "song_id").Query(session)
 				selectSong := qb.Select("batch_test.songs").Where(qb.Eq("id")).Query(session)
 				selectPlaylist := qb.Select("batch_test.playlists").Where(qb.Eq("id")).Query(session)
-
+				deleteSong := qb.Delete("batch_test.songs").Where(qb.Eq("id")).Query(session)
-	t.Run("batch inserts", func(t *testing.T) {
+				deletePlaylist := qb.Delete("batch_test.playlists").Where(qb.Eq("id")).Query(session)
-		t.Parallel()
-
-		type batchQry struct {
-			qry *gocqlx.Queryx
-			arg interface{}
-		}
-
-		qrys := []batchQry{
-			{qry: insertSong, arg: song},
-			{qry: insertPlaylist, arg: playlist},
-		}
 
 				b := session.NewBatch(gocql.LoggedBatch)
-		for _, qry := range qrys {
+
-			if err := b.BindStruct(qry.qry, qry.arg); err != nil {
+				if err = tcase.methodSong(b, insertSong, song); err != nil {
-				t.Fatal("BindStruct failed:", err)
+					t.Fatal("insert song:", err)
 				}
+				if err = tcase.methodPlaylist(b, insertPlaylist, playlist); err != nil {
+					t.Fatal("insert playList:", err)
 				}
+
 				if err := session.ExecuteBatch(b); err != nil {
 					t.Fatal("batch execution:", err)
 				}
@@ -94,10 +174,18 @@ func TestBatch(t *testing.T) {
 				// verify playlist item was inserted
 				var gotPlayList PlaylistItem
 				if err := selectPlaylist.BindStruct(playlist).Get(&gotPlayList); err != nil {
-			t.Fatal("select song:", err)
+					t.Fatal("select playList:", err)
 				}
 				if diff := cmp.Diff(gotPlayList, playlist); diff != "" {
 					t.Errorf("expected %v playList, got %v, diff: %q", playlist, gotPlayList, diff)
 				}
+				if err = deletePlaylist.BindStruct(playlist).Exec(); err != nil {
+					t.Error("delete playlist:", err)
+				}
+				if err = deleteSong.BindStruct(song).Exec(); err != nil {
+					t.Error("delete song:", err)
+				}
+			})
+		}
 	})
 }