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// Copyright 2019 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.
// [START spanner_quickstart]
// Sample spanner_quickstart is a basic program that uses Cloud Spanner.
package main
import (
"context"
"fmt"
"log"
"cloud.google.com/go/spanner"
"google.golang.org/api/iterator"
)
func main() {
ctx := context.Background()
// This database must exist.
databaseName := "projects/your-project-id/instances/your-instance-id/databases/your-database-id"
client, err := spanner.NewClient(ctx, databaseName)
if err != nil {
log.Fatalf("Failed to create client %v", err)
}
defer client.Close()
stmt := spanner.Statement{SQL: "SELECT 1"}
iter := client.Single().Query(ctx, stmt)
defer iter.Stop()
for {
row, err := iter.Next()
if err == iterator.Done {
fmt.Println("Done")
return
}
if err != nil {
log.Fatalf("Query failed with %v", err)
}
var i int64
if row.Columns(&i) != nil {
log.Fatalf("Failed to parse row %v", err)
}
fmt.Printf("Got value %v\n", i)
}
}
// [END spanner_quickstart]
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