forked from awsdocs/aws-doc-sdk-examples
/
DynamoDBReadItem.go
87 lines (72 loc) · 2.19 KB
/
DynamoDBReadItem.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[dynamodb.go.read_item]
package main
// snippet-start:[dynamodb.go.read_item.imports]
import (
"errors"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
"fmt"
"log"
)
// snippet-end:[dynamodb.go.read_item.imports]
// snippet-start:[dynamodb.go.read_item.struct]
// Create struct to hold info about new item
type Item struct {
Year int
Title string
Plot string
Rating float64
}
// snippet-end:[dynamodb.go.read_item.struct]
func main() {
// snippet-start:[dynamodb.go.read_item.session]
// Initialize a session that the SDK will use to load
// credentials from the shared credentials file ~/.aws/credentials
// and region from the shared configuration file ~/.aws/config.
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
// Create DynamoDB client
svc := dynamodb.New(sess)
// snippet-end:[dynamodb.go.read_item.session]
// snippet-start:[dynamodb.go.read_item.call]
tableName := "Movies"
movieName := "The Big New Movie"
movieYear := "2015"
result, err := svc.GetItem(&dynamodb.GetItemInput{
TableName: aws.String(tableName),
Key: map[string]*dynamodb.AttributeValue{
"Year": {
N: aws.String(movieYear),
},
"Title": {
S: aws.String(movieName),
},
},
})
if err != nil {
log.Fatalf("Got error calling GetItem: %s", err)
}
// snippet-end:[dynamodb.go.read_item.call]
// snippet-start:[dynamodb.go.read_item.unmarshall]
if result.Item == nil {
msg := "Could not find '" + *title + "'"
return nil, errors.New(msg)
}
item := Item{}
err = dynamodbattribute.UnmarshalMap(result.Item, &item)
if err != nil {
panic(fmt.Sprintf("Failed to unmarshal Record, %v", err))
}
fmt.Println("Found item:")
fmt.Println("Year: ", item.Year)
fmt.Println("Title: ", item.Title)
fmt.Println("Plot: ", item.Plot)
fmt.Println("Rating:", item.Rating)
// snippet-end:[dynamodb.go.read_item.unmarshall]
}
// snippet-end:[dynamodb.go.read_item]