appengine-java8/spanner/src/main/java/com/example/appengine/spanner/SpannerTasks.java [126:151]:
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  private static void writeExampleData(PrintWriter pw) {
    List<Mutation> mutations = new ArrayList<>();
    for (Singer singer : SINGERS) {
      mutations.add(
          Mutation.newInsertBuilder("Singers")
              .set("SingerId")
              .to(singer.singerId)
              .set("FirstName")
              .to(singer.firstName)
              .set("LastName")
              .to(singer.lastName)
              .build());
    }
    for (Album album : ALBUMS) {
      mutations.add(
          Mutation.newInsertBuilder("Albums")
              .set("SingerId")
              .to(album.singerId)
              .set("AlbumId")
              .to(album.albumId)
              .set("AlbumTitle")
              .to(album.albumTitle)
              .build());
    }
    SpannerClient.getDatabaseClient().write(mutations);
  }
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appengine-java11/spanner/src/main/java/com/example/appengine/spanner/SpannerTasks.java [126:151]:
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  private static void writeExampleData(PrintWriter pw) {
    List<Mutation> mutations = new ArrayList<>();
    for (Singer singer : SINGERS) {
      mutations.add(
          Mutation.newInsertBuilder("Singers")
              .set("SingerId")
              .to(singer.singerId)
              .set("FirstName")
              .to(singer.firstName)
              .set("LastName")
              .to(singer.lastName)
              .build());
    }
    for (Album album : ALBUMS) {
      mutations.add(
          Mutation.newInsertBuilder("Albums")
              .set("SingerId")
              .to(album.singerId)
              .set("AlbumId")
              .to(album.albumId)
              .set("AlbumTitle")
              .to(album.albumTitle)
              .build());
    }
    SpannerClient.getDatabaseClient().write(mutations);
  }
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