forked from awsdocs/aws-doc-sdk-examples
/
update_item.go
93 lines (76 loc) · 2.68 KB
/
update_item.go
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// snippet-comment:[These are tags for the AWS doc team's sample catalog. Do not remove.]
// snippet-sourceauthor:[Doug-AWS]
// snippet-sourcedescription:[Updates an item in an Amazon DynamoDB table.]
// snippet-keyword:[Amazon DynamoDB]
// snippet-keyword:[UpdateItem function]
// snippet-keyword:[Go]
// snippet-sourcesyntax:[go]
// snippet-service:[dynamodb]
// snippet-keyword:[Code Sample]
// snippet-sourcetype:[full-example]
// snippet-sourcedate:[2019-03-12]
/*
Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
This file is licensed under the Apache License, Version 2.0 (the "License").
You may not use this file except in compliance with the License. A copy of
the License is located at
http://aws.amazon.com/apache2.0/
This file 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 (
"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"
)
// ItemInfo holds info to update
type ItemInfo struct {
Rating float64 `json:"rating"`
}
// Item identifies the item in the table
type Item struct {
Year int `json:"year"`
Title string `json:"title"`
}
func main() {
// Initialize a session in us-west-2 that the SDK will use to load
// credentials from the shared credentials file ~/.aws/credentials.
sess, err := session.NewSession(&aws.Config{
Region: aws.String("us-west-2")},
)
// Create DynamoDB client
svc := dynamodb.New(sess)
info := ItemInfo{
Rating: 0.5,
}
item := Item{
Year: 2015,
Title: "The Big New Movie",
}
expr, err := dynamodbattribute.MarshalMap(info)
if err != nil {
log.Fatalf("Got error marshalling info: %s", err)
}
key, err := dynamodbattribute.MarshalMap(item)
if err != nil {
log.Fatalf("Got error marshalling item: %s", err)
}
// Update item in table Movies
input := &dynamodb.UpdateItemInput{
ExpressionAttributeValues: expr,
TableName: aws.String("Movies"),
Key: key,
ReturnValues: aws.String("UPDATED_NEW"),
UpdateExpression: aws.String("set info.rating = :r"),
}
_, err = svc.UpdateItem(input)
if err != nil {
log.Fatalf("Got error calling UpdateItem: %s", err)
}
fmt.Println("Successfully updated 'The Big New Movie' (2015) rating to 0.5")
}