Supprimer un élément d'une table DynamoDB - Amazon DynamoDB

Supprimer un élément d'une table DynamoDB

Vous pouvez supprimer des éléments des tables DynamoDB à l'aide de l'AWS Management Console, de l'AWS CLI, ou d'un kit AWS SDK. Pour plus d'informations sur les éléments, consultez Principaux composants d'Amazon DynamoDB.

Supprimer un élément d'une table DynamoDB à l'aide d'un kit AWS SDK

Les exemples de code suivants montrent comment supprimer un élément d'une table DynamoDB à l'aide d'un kit AWS SDK.

.NET
AWS SDK for .NET

/// <summary> /// Deletes a single item from a DynamoDB table. /// </summary> /// <param name="client">The initialized DynamoDB client object.</param> /// <param name="tableName">The name of the table from which the item /// will be deleted.</param> /// <param name="movieToDelete">A movie object containing the title and /// year of the movie to delete.</param> /// <returns>A Boolean value indicating the success or failure of the /// delete operation.</returns> public static async Task<bool> DeleteItemAsync( AmazonDynamoDBClient client, string tableName, Movie movieToDelete) { var key = new Dictionary<string, AttributeValue> { ["title"] = new AttributeValue { S = movieToDelete.Title }, ["year"] = new AttributeValue { N = movieToDelete.Year.ToString() }, }; var request = new DeleteItemRequest { TableName = tableName, Key = key, }; var response = await client.DeleteItemAsync(request); return response.HttpStatusCode == System.Net.HttpStatusCode.OK; }
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, consultez DeleteItem dans la référence d'API AWS SDK for .NET.

Go
Kit SDK for Go V2

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples. // It contains a DynamoDB service client that is used to act on the specified table. type TableBasics struct { DynamoDbClient *dynamodb.Client TableName string } // DeleteMovie removes a movie from the DynamoDB table. func (basics TableBasics) DeleteMovie(movie Movie) error { _, err := basics.DynamoDbClient.DeleteItem(context.TODO(), &dynamodb.DeleteItemInput{ TableName: aws.String(basics.TableName), Key: movie.GetKey(), }) if err != nil { log.Printf("Couldn't delete %v from the table. Here's why: %v\n", movie.Title, err) } return err }
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, consultez DeleteItem dans la référence d'API AWS SDK for Go.

Java
SDK pour Java 2.x

public static void deleteDymamoDBItem(DynamoDbClient ddb, String tableName, String key, String keyVal) { HashMap<String,AttributeValue> keyToGet = new HashMap<>(); keyToGet.put(key, AttributeValue.builder() .s(keyVal) .build()); DeleteItemRequest deleteReq = DeleteItemRequest.builder() .tableName(tableName) .key(keyToGet) .build(); try { ddb.deleteItem(deleteReq); } catch (DynamoDbException e) { System.err.println(e.getMessage()); System.exit(1); } }
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, consultez DeleteItem dans la référence d'API AWS SDK for Java 2.x.

JavaScript
SDK pour JavaScript V3

Créez le client.

// Create the DynamoDB service client module using ES6 syntax. import { DynamoDBClient } from "@aws-sdk/client-dynamodb"; // Set the AWS Region. export const REGION = "REGION"; // For example, "us-east-1". // Create an Amazon DynamoDB service client object. export const ddbClient = new DynamoDBClient({ region: REGION });

Créez le client de document.

// Create a service client module using ES6 syntax. import { DynamoDBDocumentClient } from "@aws-sdk/lib-dynamodb"; import { ddbClient } from "./ddbClient.js"; // Set the AWS Region. const REGION = "REGION"; // For example, "us-east-1". const marshallOptions = { // Whether to automatically convert empty strings, blobs, and sets to `null`. convertEmptyValues: false, // false, by default. // Whether to remove undefined values while marshalling. removeUndefinedValues: false, // false, by default. // Whether to convert typeof object to map attribute. convertClassInstanceToMap: false, // false, by default. }; const unmarshallOptions = { // Whether to return numbers as a string instead of converting them to native JavaScript numbers. wrapNumbers: false, // false, by default. }; const translateConfig = { marshallOptions, unmarshallOptions }; // Create the DynamoDB document client. const ddbDocClient = DynamoDBDocumentClient.from(ddbClient, translateConfig); export { ddbDocClient };

Supprimez un élément d'une table à l'aide du client de document DynamoDB.

import { DeleteCommand } from "@aws-sdk/lib-dynamodb"; import { ddbDocClient } from "../libs/ddbDocClient.js"; // Set the parameters. export const params = { TableName: "TABLE_NAME", Key: { primaryKey: "VALUE_1", sortKey: "VALUE_2", }, }; export const deleteItem = async () => { try { const data = await ddbDocClient.send(new DeleteCommand(params)); console.log("Success - item deleted"); } catch (err) { console.log("Error", err); } }; deleteItem();

Supprimez un élément d'une table à l'aide de PartiQL.

// Import required AWS SDK clients and commands for Node.js. import { ExecuteStatementCommand } from "@aws-sdk/client-dynamodb"; import { ddbDocClient } from "../libs/ddbDocClient.js"; const tableName = process.argv[2]; const movieYear1 = process.argv[3]; const movieTitle1 = process.argv[4]; export const run = async (tableName, movieYear1, movieTitle1) => { const params = { Statement: "DELETE FROM " + tableName + " where title=? and year=?", Parameters: [{ S: movieTitle1 }, { N: movieYear1 }], }; try { const data = await ddbDocClient.send(new ExecuteStatementCommand(params)); console.log("Success. Item deleted."); return "Run successfully"; // For unit tests. } catch (err) { console.error(err); } }; run(tableName, movieYear1, movieTitle1);

Supprimez un élément d'une table par lot à l'aide de PartiQL.

// Import required AWS SDK clients and commands for Node.js. import { BatchExecuteStatementCommand } from "@aws-sdk/client-dynamodb"; import { ddbDocClient } from "../libs/ddbDocClient.js"; const tableName = process.argv[2]; const movieYear1 = process.argv[3]; const movieTitle1 = process.argv[4]; const movieYear2 = process.argv[5]; const movieTitle2 = process.argv[6]; export const run = async ( tableName, movieYear1, movieTitle1, movieYear2, movieTitle2 ) => { try { const params = { Statements: [ { Statement: "DELETE FROM " + tableName + " where year=? and title=?", Parameters: [{ N: movieYear1 }, { S: movieTitle1 }], }, { Statement: "DELETE FROM " + tableName + " where year=? and title=?", Parameters: [{ N: movieYear2 }, { S: movieTitle2 }], }, ], }; const data = await ddbDocClient.send( new BatchExecuteStatementCommand(params) ); console.log("Success. Items deleted.", data); return "Run successfully"; // For unit tests. } catch (err) { console.error(err); } }; run(tableName, movieYear1, movieTitle1, movieYear2, movieTitle2);
Kit SDK pour JavaScript V2

Supprimez un élément d'une table .

// Load the AWS SDK for Node.js var AWS = require('aws-sdk'); // Set the region AWS.config.update({region: 'REGION'}); // Create the DynamoDB service object var ddb = new AWS.DynamoDB({apiVersion: '2012-08-10'}); var params = { TableName: 'TABLE', Key: { 'KEY_NAME': {N: 'VALUE'} } }; // Call DynamoDB to delete the item from the table ddb.deleteItem(params, function(err, data) { if (err) { console.log("Error", err); } else { console.log("Success", data); } });

Supprimez un élément d'une table à l'aide du client de document DynamoDB.

// Load the AWS SDK for Node.js var AWS = require('aws-sdk'); // Set the region AWS.config.update({region: 'REGION'}); // Create DynamoDB document client var docClient = new AWS.DynamoDB.DocumentClient({apiVersion: '2012-08-10'}); var params = { Key: { 'HASH_KEY': VALUE }, TableName: 'TABLE' }; docClient.delete(params, function(err, data) { if (err) { console.log("Error", err); } else { console.log("Success", data); } });
Kotlin
Kits SDK pour Kotlin
Note

Ceci est une documentation préliminaire pour une fonctionnalité en version de prévisualisation. Elle est susceptible d'être modifiée.

suspend fun deleteDymamoDBItem(tableNameVal: String, keyName: String, keyVal: String) { val keyToGet = mutableMapOf<String, AttributeValue>() keyToGet[keyName] = AttributeValue.S(keyVal) val request = DeleteItemRequest { tableName = tableNameVal key = keyToGet } DynamoDbClient { region = "us-east-1" }.use { ddb -> ddb.deleteItem(request) println("Item with key matching $keyVal was deleted") } }
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour obtenir plus de détails sur l'API, consultez DeleteItem dans la référence d'API du kit AWS SDK pour Kotlin.

Python
SDK pour Python (Boto3)

class Movies: """Encapsulates an Amazon DynamoDB table of movie data.""" def __init__(self, dyn_resource): """ :param dyn_resource: A Boto3 DynamoDB resource. """ self.dyn_resource = dyn_resource self.table = None def delete_movie(self, title, year): """ Deletes a movie from the table. :param title: The title of the movie to delete. :param year: The release year of the movie to delete. """ try: self.table.delete_item(Key={'year': year, 'title': title}) except ClientError as err: logger.error( "Couldn't delete movie %s. Here's why: %s: %s", title, err.response['Error']['Code'], err.response['Error']['Message']) raise

Vous pouvez spécifier une condition pour qu'un élément soit supprimé uniquement lorsqu'il répond à certains critères.

class UpdateQueryWrapper: def __init__(self, table): self.table = table def delete_underrated_movie(self, title, year, rating): """ Deletes a movie only if it is rated below a specified value. By using a condition expression in a delete operation, you can specify that an item is deleted only when it meets certain criteria. :param title: The title of the movie to delete. :param year: The release year of the movie to delete. :param rating: The rating threshold to check before deleting the movie. """ try: self.table.delete_item( Key={'year': year, 'title': title}, ConditionExpression="info.rating <= :val", ExpressionAttributeValues={":val": Decimal(str(rating))}) except ClientError as err: if err.response['Error']['Code'] == "ConditionalCheckFailedException": logger.warning( "Didn't delete %s because its rating is greater than %s.", title, rating) else: logger.error( "Couldn't delete movie %s. Here's why: %s: %s", title, err.response['Error']['Code'], err.response['Error']['Message']) raise
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, veuillez consulter DeleteItem dans la référence d'API du kit AWS SDK pour Python (Boto3).

Ruby
Kit SDK for Ruby

# Deletes a movie from the table. # # @param title [String] The title of the movie to delete. # @param year [Integer] The release year of the movie to delete. def delete_movie(title, year) @table.delete_item(key: {"year" => year, "title" => title}) rescue Aws::Errors::ServiceError => e puts("Couldn't delete movie #{title}. Here's why:") puts("\t#{e.code}: #{e.message}") raise end
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, consultez DeleteItem dans la référence d'API AWS SDK for Ruby.

Rust
Kit SDK pour Rust
Note

Cette documentation concerne un kit SDK en prévisualisation préliminaire. Le kit SDK est susceptible d'être modifié et ne doit pas être utilisé en production.

async fn delete_item(client: &Client, table: &str, key: &str, value: &str) -> Result<(), Error> { match client .delete_item() .table_name(table) .key(key, AttributeValue::S(value.into())) .send() .await { Ok(_) => println!("Deleted item from table"), Err(e) => { println!("Got an error deleting item from table:"); println!("{}", e); process::exit(1); } }; Ok(()) }
  • Trouvez des instructions et plus de code sur GitHub.

  • Pour plus d'informations sur l'API, consultez DeleteItemt dans la référence d'API du kit AWS SDK pour Rust.

Pour obtenir plus d'exemples avec DynamoDB, consultez Exemples de code pour Amazon S3 utilisant des kits AWS SDK.