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main.go
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main.go
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// Copyright 2023 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
//
// http://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 main
import (
"errors"
"fmt"
spannergorm "github.com/googleapis/go-gorm-spanner"
"github.com/googleapis/go-gorm-spanner/samples"
_ "github.com/googleapis/go-sql-spanner"
"gorm.io/gorm"
)
// Simple sample application that shows how to use GORM with Cloud Spanner.
//
// Execute the sample with the command `go run main.go` from this directory.
func helloWorld(projectId, instanceId, databaseId string) error {
db, err := gorm.Open(spannergorm.New(spannergorm.Config{
DriverName: "spanner",
DSN: fmt.Sprintf("projects/%s/instances/%s/databases/%s", projectId, instanceId, databaseId),
}), &gorm.Config{PrepareStmt: true})
if err != nil {
return fmt.Errorf("failed to open database connection: %v\n", err)
}
var msg []string
if err := db.Raw("SELECT 'Hello World!'").Scan(&msg).Error; err != nil {
return fmt.Errorf("failed to execute query: %v", err)
}
if len(msg) == 0 {
return errors.New("failed to execute query")
}
for _, m := range msg {
fmt.Printf("%s\n", m)
}
return nil
}
func main() {
samples.RunSampleOnEmulator(helloWorld)
}