Verwenden Sie mit BatchExecuteStatement einem AWS SDKoder CLI

Die folgenden Codebeispiele zeigen die VerwendungBatchExecuteStatement.

Beispiele für Aktionen sind Codeauszüge aus größeren Programmen und müssen im Kontext ausgeführt werden. Im folgenden Codebeispiel können Sie diese Aktion im Kontext sehen:

• Abfragen einer Tabelle mithilfe von Stapeln von PartiQL-Anweisungen

.NET

AWS SDK for .NET

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

Verwenden Sie Stapel von INSERT Anweisungen, um Elemente hinzuzufügen.

        /// <summary>
        /// Inserts movies imported from a JSON file into the movie table by
        /// using an Amazon DynamoDB PartiQL INSERT statement.
        /// </summary>
        /// <param name="tableName">The name of the table into which the movie
        /// information will be inserted.</param>
        /// <param name="movieFileName">The name of the JSON file that contains
        /// movie information.</param>
        /// <returns>A Boolean value that indicates the success or failure of
        /// the insert operation.</returns>
        public static async Task<bool> InsertMovies(string tableName, string movieFileName)
        {
            // Get the list of movies from the JSON file.
            var movies = ImportMovies(movieFileName);

            var success = false;

            if (movies is not null)
            {
                // Insert the movies in a batch using PartiQL. Because the
                // batch can contain a maximum of 25 items, insert 25 movies
                // at a time.
                string insertBatch = $"INSERT INTO {tableName} VALUE {{'title': ?, 'year': ?}}";
                var statements = new List<BatchStatementRequest>();

                try
                {
                    for (var indexOffset = 0; indexOffset < 250; indexOffset += 25)
                    {
                        for (var i = indexOffset; i < indexOffset + 25; i++)
                        {
                            statements.Add(new BatchStatementRequest
                            {
                                Statement = insertBatch,
                                Parameters = new List<AttributeValue>
                                {
                                    new AttributeValue { S = movies[i].Title },
                                    new AttributeValue { N = movies[i].Year.ToString() },
                                },
                            });
                        }

                        var response = await Client.BatchExecuteStatementAsync(new BatchExecuteStatementRequest
                        {
                            Statements = statements,
                        });

                        // Wait between batches for movies to be successfully added.
                        System.Threading.Thread.Sleep(3000);

                        success = response.HttpStatusCode == System.Net.HttpStatusCode.OK;

                        // Clear the list of statements for the next batch.
                        statements.Clear();
                    }
                }
                catch (AmazonDynamoDBException ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }

            return success;
        }

        /// <summary>
        /// Loads the contents of a JSON file into a list of movies to be
        /// added to the DynamoDB table.
        /// </summary>
        /// <param name="movieFileName">The full path to the JSON file.</param>
        /// <returns>A generic list of movie objects.</returns>
        public static List<Movie> ImportMovies(string movieFileName)
        {
            if (!File.Exists(movieFileName))
            {
                return null!;
            }

            using var sr = new StreamReader(movieFileName);
            string json = sr.ReadToEnd();
            var allMovies = JsonConvert.DeserializeObject<List<Movie>>(json);

            if (allMovies is not null)
            {
                // Return the first 250 entries.
                return allMovies.GetRange(0, 250);
            }
            else
            {
                return null!;
            }
        }

Verwenden Sie Stapel von SELECT Anweisungen, um Elemente abzurufen.

        /// <summary>
        /// Gets movies from the movie table by
        /// using an Amazon DynamoDB PartiQL SELECT statement.
        /// </summary>
        /// <param name="tableName">The name of the table.</param>
        /// <param name="title1">The title of the first movie.</param>
        /// <param name="title2">The title of the second movie.</param>
        /// <param name="year1">The year of the first movie.</param>
        /// <param name="year2">The year of the second movie.</param>
        /// <returns>True if successful.</returns>
        public static async Task<bool> GetBatch(
            string tableName,
            string title1,
            string title2,
            int year1,
            int year2)
        {
            var getBatch = $"SELECT FROM {tableName} WHERE title = ? AND year = ?";
            var statements = new List<BatchStatementRequest>
            {
                new BatchStatementRequest
                {
                    Statement = getBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = title1 },
                        new AttributeValue { N = year1.ToString() },
                    },
                },

                new BatchStatementRequest
                {
                    Statement = getBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = title2 },
                        new AttributeValue { N = year2.ToString() },
                    },
                }
            };

            var response = await Client.BatchExecuteStatementAsync(new BatchExecuteStatementRequest
            {
                Statements = statements,
            });

            if (response.Responses.Count > 0)
            {
                response.Responses.ForEach(r =>
                {
                    Console.WriteLine($"{r.Item["title"]}\t{r.Item["year"]}");
                });
                return true;
            }
            else
            {
                Console.WriteLine($"Couldn't find either {title1} or {title2}.");
                return false;
            }

        }

Verwenden Sie Stapel von UPDATE Kontoauszügen, um Elemente zu aktualisieren.

        /// <summary>
        /// Updates information for multiple movies.
        /// </summary>
        /// <param name="tableName">The name of the table containing the
        /// movies to be updated.</param>
        /// <param name="producer1">The producer name for the first movie
        /// to update.</param>
        /// <param name="title1">The title of the first movie.</param>
        /// <param name="year1">The year that the first movie was released.</param>
        /// <param name="producer2">The producer name for the second
        /// movie to update.</param>
        /// <param name="title2">The title of the second movie.</param>
        /// <param name="year2">The year that the second movie was released.</param>
        /// <returns>A Boolean value that indicates the success of the update.</returns>
        public static async Task<bool> UpdateBatch(
            string tableName,
            string producer1,
            string title1,
            int year1,
            string producer2,
            string title2,
            int year2)
        {

            string updateBatch = $"UPDATE {tableName} SET Producer=? WHERE title = ? AND year = ?";
            var statements = new List<BatchStatementRequest>
            {
                new BatchStatementRequest
                {
                    Statement = updateBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = producer1 },
                        new AttributeValue { S = title1 },
                        new AttributeValue { N = year1.ToString() },
                    },
                },

                new BatchStatementRequest
                {
                    Statement = updateBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = producer2 },
                        new AttributeValue { S = title2 },
                        new AttributeValue { N = year2.ToString() },
                    },
                }
            };

            var response = await Client.BatchExecuteStatementAsync(new BatchExecuteStatementRequest
            {
                Statements = statements,
            });

            return response.HttpStatusCode == System.Net.HttpStatusCode.OK;
        }

Verwenden Sie Stapel von DELETE Kontoauszügen, um Elemente zu löschen.

        /// <summary>
        /// Deletes multiple movies using a PartiQL BatchExecuteAsync
        /// statement.
        /// </summary>
        /// <param name="tableName">The name of the table containing the
        /// moves that will be deleted.</param>
        /// <param name="title1">The title of the first movie.</param>
        /// <param name="year1">The year the first movie was released.</param>
        /// <param name="title2">The title of the second movie.</param>
        /// <param name="year2">The year the second movie was released.</param>
        /// <returns>A Boolean value indicating the success of the operation.</returns>
        public static async Task<bool> DeleteBatch(
            string tableName,
            string title1,
            int year1,
            string title2,
            int year2)
        {

            string updateBatch = $"DELETE FROM {tableName} WHERE title = ? AND year = ?";
            var statements = new List<BatchStatementRequest>
            {
                new BatchStatementRequest
                {
                    Statement = updateBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = title1 },
                        new AttributeValue { N = year1.ToString() },
                    },
                },

                new BatchStatementRequest
                {
                    Statement = updateBatch,
                    Parameters = new List<AttributeValue>
                    {
                        new AttributeValue { S = title2 },
                        new AttributeValue { N = year2.ToString() },
                    },
                }
            };

            var response = await Client.BatchExecuteStatementAsync(new BatchExecuteStatementRequest
            {
                Statements = statements,
            });

            return response.HttpStatusCode == System.Net.HttpStatusCode.OK;
        }

• APIEinzelheiten finden Sie unter BatchExecuteStatementAWS SDK for .NET APIReferenz.

C++

SDKfür C++

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

Verwenden Sie Stapel von INSERT Anweisungen, um Elemente hinzuzufügen.

    // 2. Add multiple movies using "Insert" statements. (BatchExecuteStatement)
    Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfiguration);

    std::vector<Aws::String> titles;
    std::vector<float> ratings;
    std::vector<int> years;
    std::vector<Aws::String> plots;
    Aws::String doAgain = "n";
    do {
        Aws::String aTitle = askQuestion(
                "Enter the title of a movie you want to add to the table: ");
        titles.push_back(aTitle);
        int aYear = askQuestionForInt("What year was it released? ");
        years.push_back(aYear);
        float aRating = askQuestionForFloatRange(
                "On a scale of 1 - 10, how do you rate it? ",
                1, 10);
        ratings.push_back(aRating);
        Aws::String aPlot = askQuestion("Summarize the plot for me: ");
        plots.push_back(aPlot);

        doAgain = askQuestion(Aws::String("Would you like to add more movies? (y/n) "));
    } while (doAgain == "y");

    std::cout << "Adding " << titles.size()
              << (titles.size() == 1 ? " movie " : " movies ")
              << "to the table using a batch \"INSERT\" statement." << std::endl;

    {
        Aws::Vector<Aws::DynamoDB::Model::BatchStatementRequest> statements(
                titles.size());

        std::stringstream sqlStream;
        sqlStream << "INSERT INTO \"" << MOVIE_TABLE_NAME << "\" VALUE {'"
                  << TITLE_KEY << "': ?, '" << YEAR_KEY << "': ?, '"
                  << INFO_KEY << "': ?}";

        std::string sql(sqlStream.str());

        for (size_t i = 0; i < statements.size(); ++i) {
            statements[i].SetStatement(sql);

            Aws::Vector<Aws::DynamoDB::Model::AttributeValue> attributes;
            attributes.push_back(
                    Aws::DynamoDB::Model::AttributeValue().SetS(titles[i]));
            attributes.push_back(Aws::DynamoDB::Model::AttributeValue().SetN(years[i]));

            // Create attribute for the info map.
            Aws::DynamoDB::Model::AttributeValue infoMapAttribute;

            std::shared_ptr<Aws::DynamoDB::Model::AttributeValue> ratingAttribute = Aws::MakeShared<Aws::DynamoDB::Model::AttributeValue>(
                    ALLOCATION_TAG.c_str());
            ratingAttribute->SetN(ratings[i]);
            infoMapAttribute.AddMEntry(RATING_KEY, ratingAttribute);

            std::shared_ptr<Aws::DynamoDB::Model::AttributeValue> plotAttribute = Aws::MakeShared<Aws::DynamoDB::Model::AttributeValue>(
                    ALLOCATION_TAG.c_str());
            plotAttribute->SetS(plots[i]);
            infoMapAttribute.AddMEntry(PLOT_KEY, plotAttribute);
            attributes.push_back(infoMapAttribute);
            statements[i].SetParameters(attributes);
        }

        Aws::DynamoDB::Model::BatchExecuteStatementRequest request;

        request.SetStatements(statements);

        Aws::DynamoDB::Model::BatchExecuteStatementOutcome outcome = dynamoClient.BatchExecuteStatement(
                request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to add the movies: " << outcome.GetError().GetMessage()
                      << std::endl;
            return false;
        }
    }

Verwenden Sie Stapel von SELECT Anweisungen, um Elemente abzurufen.

    // 3. Get the data for multiple movies using "Select" statements. (BatchExecuteStatement)
    {
        Aws::Vector<Aws::DynamoDB::Model::BatchStatementRequest> statements(
                titles.size());
        std::stringstream sqlStream;
        sqlStream << "SELECT * FROM  \"" << MOVIE_TABLE_NAME << "\" WHERE "
                  << TITLE_KEY << "=? and " << YEAR_KEY << "=?";

        std::string sql(sqlStream.str());

        for (size_t i = 0; i < statements.size(); ++i) {
            statements[i].SetStatement(sql);
            Aws::Vector<Aws::DynamoDB::Model::AttributeValue> attributes;
            attributes.push_back(
                    Aws::DynamoDB::Model::AttributeValue().SetS(titles[i]));
            attributes.push_back(Aws::DynamoDB::Model::AttributeValue().SetN(years[i]));
            statements[i].SetParameters(attributes);
        }

        Aws::DynamoDB::Model::BatchExecuteStatementRequest request;

        request.SetStatements(statements);

        Aws::DynamoDB::Model::BatchExecuteStatementOutcome outcome = dynamoClient.BatchExecuteStatement(
                request);
        if (outcome.IsSuccess()) {
            const Aws::DynamoDB::Model::BatchExecuteStatementResult &result = outcome.GetResult();

            const Aws::Vector<Aws::DynamoDB::Model::BatchStatementResponse> &responses = result.GetResponses();

            for (const Aws::DynamoDB::Model::BatchStatementResponse &response: responses) {
                const Aws::Map<Aws::String, Aws::DynamoDB::Model::AttributeValue> &item = response.GetItem();

                printMovieInfo(item);
            }
        }
        else {
            std::cerr << "Failed to retrieve the movie information: "
                      << outcome.GetError().GetMessage() << std::endl;
            return false;
        }
    }

Verwenden Sie Stapel von UPDATE Kontoauszügen, um Elemente zu aktualisieren.

    // 4. Update the data for multiple movies using "Update" statements. (BatchExecuteStatement)

    for (size_t i = 0; i < titles.size(); ++i) {
        ratings[i] = askQuestionForFloatRange(
                Aws::String("\nLet's update your the movie, \"") + titles[i] +
                ".\nYou rated it  " + std::to_string(ratings[i])
                + ", what new rating would you give it? ", 1, 10);
    }

    std::cout << "Updating the movie with a batch \"UPDATE\" statement." << std::endl;

    {
        Aws::Vector<Aws::DynamoDB::Model::BatchStatementRequest> statements(
                titles.size());

        std::stringstream sqlStream;
        sqlStream << "UPDATE \"" << MOVIE_TABLE_NAME << "\" SET "
                  << INFO_KEY << "." << RATING_KEY << "=? WHERE "
                  << TITLE_KEY << "=? AND " << YEAR_KEY << "=?";


        std::string sql(sqlStream.str());

        for (size_t i = 0; i < statements.size(); ++i) {
            statements[i].SetStatement(sql);

            Aws::Vector<Aws::DynamoDB::Model::AttributeValue> attributes;
            attributes.push_back(
                    Aws::DynamoDB::Model::AttributeValue().SetN(ratings[i]));
            attributes.push_back(
                    Aws::DynamoDB::Model::AttributeValue().SetS(titles[i]));
            attributes.push_back(Aws::DynamoDB::Model::AttributeValue().SetN(years[i]));
            statements[i].SetParameters(attributes);
        }

        Aws::DynamoDB::Model::BatchExecuteStatementRequest request;

        request.SetStatements(statements);
        Aws::DynamoDB::Model::BatchExecuteStatementOutcome outcome = dynamoClient.BatchExecuteStatement(
                request);
        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to update movie information: "
                      << outcome.GetError().GetMessage() << std::endl;
            return false;
        }
    }

Verwenden Sie Stapel von DELETE Kontoauszügen, um Elemente zu löschen.

    // 6. Delete multiple movies using "Delete" statements. (BatchExecuteStatement)
    {
        Aws::Vector<Aws::DynamoDB::Model::BatchStatementRequest> statements(
                titles.size());
        std::stringstream sqlStream;
        sqlStream << "DELETE FROM  \"" << MOVIE_TABLE_NAME << "\" WHERE "
                  << TITLE_KEY << "=? and " << YEAR_KEY << "=?";

        std::string sql(sqlStream.str());

        for (size_t i = 0; i < statements.size(); ++i) {
            statements[i].SetStatement(sql);
            Aws::Vector<Aws::DynamoDB::Model::AttributeValue> attributes;
            attributes.push_back(
                    Aws::DynamoDB::Model::AttributeValue().SetS(titles[i]));
            attributes.push_back(Aws::DynamoDB::Model::AttributeValue().SetN(years[i]));
            statements[i].SetParameters(attributes);
        }

        Aws::DynamoDB::Model::BatchExecuteStatementRequest request;

        request.SetStatements(statements);

        Aws::DynamoDB::Model::BatchExecuteStatementOutcome outcome = dynamoClient.BatchExecuteStatement(
                request);

        if (!outcome.IsSuccess()) {
            std::cerr << "Failed to delete the movies: "
                      << outcome.GetError().GetMessage() << std::endl;
            return false;
        }
    }

• APIEinzelheiten finden Sie unter BatchExecuteStatementAWS SDK for C++ APIReferenz.

Go

SDKfür Go V2

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

Verwenden Sie Stapel von INSERT Anweisungen, um Elemente hinzuzufügen.

// AddMovieBatch runs a batch of PartiQL INSERT statements to add multiple movies to the
// DynamoDB table.
func (runner PartiQLRunner) AddMovieBatch(movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year, movie.Info})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(fmt.Sprintf(
				"INSERT INTO \"%v\" VALUE {'title': ?, 'year': ?, 'info': ?}", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(context.TODO(), &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't insert a batch of items with PartiQL. Here's why: %v\n", err)
	}
	return err
}

Verwenden Sie Stapel von SELECT Anweisungen, um Elemente abzurufen.

// GetMovieBatch runs a batch of PartiQL SELECT statements to get multiple movies from
// the DynamoDB table by title and year.
func (runner PartiQLRunner) GetMovieBatch(movies []Movie) ([]Movie, error) {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("SELECT * FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	output, err := runner.DynamoDbClient.BatchExecuteStatement(context.TODO(), &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	var outMovies []Movie
	if err != nil {
		log.Printf("Couldn't get a batch of items with PartiQL. Here's why: %v\n", err)
	} else {
		for _, response := range output.Responses {
			var movie Movie
			err = attributevalue.UnmarshalMap(response.Item, &movie)
			if err != nil {
				log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
			} else {
				outMovies = append(outMovies, movie)
			}
		}
	}
	return outMovies, err
}

Verwenden Sie Stapel von UPDATE Kontoauszügen, um Elemente zu aktualisieren.

// UpdateMovieBatch runs a batch of PartiQL UPDATE statements to update the rating of
// multiple movies that already exist in the DynamoDB table.
func (runner PartiQLRunner) UpdateMovieBatch(movies []Movie, ratings []float64) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{ratings[index], movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("UPDATE \"%v\" SET info.rating=? WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(context.TODO(), &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't update the batch of movies. Here's why: %v\n", err)
	}
	return err
}

Verwenden Sie Stapel von DELETE Kontoauszügen, um Elemente zu löschen.

// DeleteMovieBatch runs a batch of PartiQL DELETE statements to remove multiple movies
// from the DynamoDB table.
func (runner PartiQLRunner) DeleteMovieBatch(movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("DELETE FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(context.TODO(), &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't delete the batch of movies. Here's why: %v\n", err)
	}
	return err
}

Definieren Sie eine Movie-Struktur, die in diesem Beispiel verwendet wird.

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}

• APIEinzelheiten finden Sie BatchExecuteStatementunter AWS SDK for Go APIReferenz.

JavaScript

SDKfür JavaScript (v3)

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

Erstellen Sie mithilfe von PartiQL einen Stapel von Elementen.

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

import {
  DynamoDBDocumentClient,
  BatchExecuteStatementCommand,
} from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({});
const docClient = DynamoDBDocumentClient.from(client);

export const main = async () => {
  const breakfastFoods = ["Eggs", "Bacon", "Sausage"];
  const command = new BatchExecuteStatementCommand({
    Statements: breakfastFoods.map((food) => ({
      Statement: `INSERT INTO BreakfastFoods value {'Name':?}`,
      Parameters: [food],
    })),
  });

  const response = await docClient.send(command);
  console.log(response);
  return response;
};

Rufen Sie mithilfe von PartiQL einen Stapel von Elementen ab.

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

import {
  DynamoDBDocumentClient,
  BatchExecuteStatementCommand,
} from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({});
const docClient = DynamoDBDocumentClient.from(client);

export const main = async () => {
  const command = new BatchExecuteStatementCommand({
    Statements: [
      {
        Statement: "SELECT * FROM PepperMeasurements WHERE Unit=?",
        Parameters: ["Teaspoons"],
        ConsistentRead: true,
      },
      {
        Statement: "SELECT * FROM PepperMeasurements WHERE Unit=?",
        Parameters: ["Grams"],
        ConsistentRead: true,
      },
    ],
  });

  const response = await docClient.send(command);
  console.log(response);
  return response;
};

Aktualisieren Sie mithilfe von PartiQL einen Stapel von Elementen.

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

import {
  DynamoDBDocumentClient,
  BatchExecuteStatementCommand,
} from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({});
const docClient = DynamoDBDocumentClient.from(client);

export const main = async () => {
  const eggUpdates = [
    ["duck", "fried"],
    ["chicken", "omelette"],
  ];
  const command = new BatchExecuteStatementCommand({
    Statements: eggUpdates.map((change) => ({
      Statement: "UPDATE Eggs SET Style=? where Variety=?",
      Parameters: [change[1], change[0]],
    })),
  });

  const response = await docClient.send(command);
  console.log(response);
  return response;
};

Löschen Sie mithilfe von PartiQL einen Stapel von Elementen.

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

import {
  DynamoDBDocumentClient,
  BatchExecuteStatementCommand,
} from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({});
const docClient = DynamoDBDocumentClient.from(client);

export const main = async () => {
  const command = new BatchExecuteStatementCommand({
    Statements: [
      {
        Statement: "DELETE FROM Flavors where Name=?",
        Parameters: ["Grape"],
      },
      {
        Statement: "DELETE FROM Flavors where Name=?",
        Parameters: ["Strawberry"],
      },
    ],
  });

  const response = await docClient.send(command);
  console.log(response);
  return response;
};

• APIEinzelheiten finden Sie BatchExecuteStatementunter AWS SDK for JavaScript APIReferenz.

PHP

SDK für PHP

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

    public function getItemByPartiQLBatch(string $tableName, array $keys): Result
    {
        $statements = [];
        foreach ($keys as $key) {
            list($statement, $parameters) = $this->buildStatementAndParameters("SELECT", $tableName, $key['Item']);
            $statements[] = [
                'Statement' => "$statement",
                'Parameters' => $parameters,
            ];
        }

        return $this->dynamoDbClient->batchExecuteStatement([
            'Statements' => $statements,
        ]);
    }

    public function insertItemByPartiQLBatch(string $statement, array $parameters)
    {
        $this->dynamoDbClient->batchExecuteStatement([
            'Statements' => [
                [
                    'Statement' => "$statement",
                    'Parameters' => $parameters,
                ],
            ],
        ]);
    }

    public function updateItemByPartiQLBatch(string $statement, array $parameters)
    {
        $this->dynamoDbClient->batchExecuteStatement([
            'Statements' => [
                [
                    'Statement' => "$statement",
                    'Parameters' => $parameters,
                ],
            ],
        ]);
    }

    public function deleteItemByPartiQLBatch(string $statement, array $parameters)
    {
        $this->dynamoDbClient->batchExecuteStatement([
            'Statements' => [
                [
                    'Statement' => "$statement",
                    'Parameters' => $parameters,
                ],
            ],
        ]);
    }

• APIEinzelheiten finden Sie BatchExecuteStatementunter AWS SDK for PHP APIReferenz.

Python

SDKfür Python (Boto3)

Anmerkung

Es gibt noch mehr dazu. GitHub Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

class PartiQLBatchWrapper:
    """
    Encapsulates a DynamoDB resource to run PartiQL statements.
    """

    def __init__(self, dyn_resource):
        """
        :param dyn_resource: A Boto3 DynamoDB resource.
        """
        self.dyn_resource = dyn_resource


    def run_partiql(self, statements, param_list):
        """
        Runs a PartiQL statement. A Boto3 resource is used even though
        `execute_statement` is called on the underlying `client` object because the
        resource transforms input and output from plain old Python objects (POPOs) to
        the DynamoDB format. If you create the client directly, you must do these
        transforms yourself.

        :param statements: The batch of PartiQL statements.
        :param param_list: The batch of PartiQL parameters that are associated with
                           each statement. This list must be in the same order as the
                           statements.
        :return: The responses returned from running the statements, if any.
        """
        try:
            output = self.dyn_resource.meta.client.batch_execute_statement(
                Statements=[
                    {"Statement": statement, "Parameters": params}
                    for statement, params in zip(statements, param_list)
                ]
            )
        except ClientError as err:
            if err.response["Error"]["Code"] == "ResourceNotFoundException":
                logger.error(
                    "Couldn't execute batch of PartiQL statements because the table "
                    "does not exist."
                )
            else:
                logger.error(
                    "Couldn't execute batch of PartiQL statements. Here's why: %s: %s",
                    err.response["Error"]["Code"],
                    err.response["Error"]["Message"],
                )
            raise
        else:
            return output

• APIEinzelheiten finden Sie BatchExecuteStatementunter AWS SDKfür Python (Boto3) API -Referenz.

Ruby

SDKfür Ruby

Anmerkung

Es gibt noch mehr dazu GitHub. Finden Sie das vollständige Beispiel und erfahren Sie, wie Sie es einrichten und ausführen in der AWS Repository mit Codebeispielen.

Lesen Sie einen Stapel von Elementen mithilfe von PartiQL.

class DynamoDBPartiQLBatch

  attr_reader :dynamo_resource
  attr_reader :table

  def initialize(table_name)
    client = Aws::DynamoDB::Client.new(region: "us-east-1")
    @dynamodb = Aws::DynamoDB::Resource.new(client: client)
    @table = @dynamodb.table(table_name)
  end

  # Selects a batch of items from a table using PartiQL
  #
  # @param batch_titles [Array] Collection of movie titles
  # @return [Aws::DynamoDB::Types::BatchExecuteStatementOutput]
  def batch_execute_select(batch_titles)
    request_items = batch_titles.map do |title, year|
      {
        statement: "SELECT * FROM \"#{@table.name}\" WHERE title=? and year=?",
        parameters: [title, year]
      }
    end
    @dynamodb.client.batch_execute_statement({statements: request_items})
  end

Löschen Sie mithilfe von PartiQL einen Stapel von Elementen.

class DynamoDBPartiQLBatch

  attr_reader :dynamo_resource
  attr_reader :table

  def initialize(table_name)
    client = Aws::DynamoDB::Client.new(region: "us-east-1")
    @dynamodb = Aws::DynamoDB::Resource.new(client: client)
    @table = @dynamodb.table(table_name)
  end

  # Deletes a batch of items from a table using PartiQL
  #
  # @param batch_titles [Array] Collection of movie titles
  # @return [Aws::DynamoDB::Types::BatchExecuteStatementOutput]
  def batch_execute_write(batch_titles)
    request_items = batch_titles.map do |title, year|
      {
        statement: "DELETE FROM \"#{@table.name}\" WHERE title=? and year=?",
        parameters: [title, year]
      }
    end
    @dynamodb.client.batch_execute_statement({statements: request_items})
  end

• APIEinzelheiten finden Sie BatchExecuteStatementunter AWS SDK for Ruby APIReferenz.

Für eine vollständige Liste von AWS SDKEntwicklerhandbücher und Codebeispiele finden Sie unterVerwenden von DynamoDB mit einem AWS SDK. Dieses Thema enthält auch Informationen zu den ersten Schritten und Details zu früheren SDK Versionen.