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spanner_create_client_with_query_options.go
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spanner_create_client_with_query_options.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_create_client_with_query_options]
import (
"context"
"fmt"
"io"
"time"
"cloud.google.com/go/spanner"
sppb "cloud.google.com/go/spanner/apiv1/spannerpb"
"google.golang.org/api/iterator"
)
func createClientWithQueryOptions(w io.Writer, database string) error {
ctx := context.Background()
queryOptions := spanner.QueryOptions{
Options: &sppb.ExecuteSqlRequest_QueryOptions{
OptimizerVersion: "1",
// The list of available statistics packages can be found by
// querying the "INFORMATION_SCHEMA.SPANNER_STATISTICS" table.
OptimizerStatisticsPackage: "latest",
},
}
client, err := spanner.NewClientWithConfig(
ctx, database, spanner.ClientConfig{QueryOptions: queryOptions},
)
if err != nil {
return err
}
defer client.Close()
stmt := spanner.Statement{SQL: `SELECT VenueId, VenueName, LastUpdateTime FROM Venues`}
iter := client.Single().Query(ctx, stmt)
defer iter.Stop()
for {
row, err := iter.Next()
if err == iterator.Done {
return nil
}
if err != nil {
return err
}
var venueID int64
var venueName string
var lastUpdateTime time.Time
if err := row.Columns(&venueID, &venueName, &lastUpdateTime); err != nil {
return err
}
fmt.Fprintf(w, "%d %s %s\n", venueID, venueName, lastUpdateTime)
}
}
// [END spanner_create_client_with_query_options]