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spanner_read_data_with_index.go
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/
spanner_read_data_with_index.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package spanner
// [START spanner_read_data_with_index]
import (
"context"
"fmt"
"io"
"cloud.google.com/go/spanner"
"google.golang.org/api/iterator"
)
func readUsingIndex(w io.Writer, db string) error {
ctx := context.Background()
client, err := spanner.NewClient(ctx, db)
if err != nil {
return err
}
defer client.Close()
iter := client.Single().ReadUsingIndex(ctx, "Albums", "AlbumsByAlbumTitle", spanner.AllKeys(),
[]string{"AlbumId", "AlbumTitle"})
defer iter.Stop()
for {
row, err := iter.Next()
if err == iterator.Done {
return nil
}
if err != nil {
return err
}
var albumID int64
var albumTitle string
if err := row.Columns(&albumID, &albumTitle); err != nil {
return err
}
fmt.Fprintf(w, "%d %s\n", albumID, albumTitle)
}
}
// [END spanner_read_data_with_index]