Java Code Examples for com.amazonaws.services.dynamodbv2.document.Table#getItem()

void getItemTest(String tableName, DynamoDB client, int pk, int sk, int iterations) {
    long startTime, endTime;
    System.out.println("GetItem test - partition key " + pk + " and sort keys 1-" + sk);
    Table table = client.getTable(tableName);

    for (int i = 0; i < iterations; i++) {
        startTime = System.nanoTime();
        try {
            for (Integer ipk = 1; ipk <= pk; ipk++) {
                for (Integer isk = 1; isk <= sk; isk++) {
                    table.getItem("pk", ipk, "sk", isk);
                }
            }
        } catch (Exception e) {
            System.err.println("Unable to get item:");
            e.printStackTrace();
        }
        endTime = System.nanoTime();
        printTime(startTime, endTime, pk * sk);
    }
}
 

private static void retrieveItem() {
    Table table = dynamoDB.getTable(tableName);

    try {

        Item item = table.getItem("Id", 120, "Id, ISBN, Title, Authors", null);

        System.out.println("Printing item after retrieving it....");
        System.out.println(item.toJSONPretty());

    }
    catch (Exception e) {
        System.err.println("GetItem failed.");
        System.err.println(e.getMessage());
    }

}
 

public static void retrieveItem(String threadId, String replyDateTime) throws IOException {
    
    Table table = dynamoDB.getTable(tableName);
    
    GetItemSpec spec = new GetItemSpec()
        .withPrimaryKey("Id", threadId, "ReplyDateTime", replyDateTime)
        .withConsistentRead(true);

    Item item = table.getItem(spec);
    
    
 // Uncompress the reply message and print
    String uncompressed = uncompressString(ByteBuffer.wrap(item.getBinary("ExtendedMessage")));
    
    System.out.println("Reply message:\n"
        + " Id: " + item.getString("Id") + "\n" 
        + " ReplyDateTime: " + item.getString("ReplyDateTime") + "\n" 
        + " PostedBy: " + item.getString("PostedBy") + "\n"
        + " Message: " + item.getString("Message") + "\n"
        + " ExtendedMessage (uncompressed): " + uncompressed + "\n");
}
 

private DefaultInstalledAppContext readFromDb(String installedAppId) {
    Table table = dynamoDB.getTable(tableName);
    Item item = table.getItem("installedAppId", installedAppId);

    if (item == null) {
        if (log.isInfoEnabled()) {
            log.info("could not find installed app " + installedAppId);
        }
        return null;
    }

    return contextFromItem(item);
}
 

@Override
public final Response getItem(final Request request) {

    Table table = dynamoDB.getTable(request.getTableName());

    Item item = table.getItem(new PrimaryKey()
            .addComponent(request.getPartitionKey(), request.getPartitionKeyValue())
            .addComponent(request.getSortKey(), Integer.parseInt(request.getSortKeyValue())));

    return new Response("PK of item read using get-item (V1): " + prepareKeyStr(item, request), null);
}
 

public long readLatestVersion() {
    Table table = dynamoDB.getTable(tableName);

    Item item = table.getItem("namespace", blobNamespace,
            "version, pin_version", null);

    if (item.isPresent("pin_version") && !item.isNull("pin_version"))
        return item.getLong("pin_version");

    return item.getLong("version");
}
 

public static void main(String[] args) throws Exception {

        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
            .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("http://localhost:8000", "us-west-2"))
            .build();

        DynamoDB dynamoDB = new DynamoDB(client);

        Table table = dynamoDB.getTable("Movies");

        int year = 2015;
        String title = "The Big New Movie";

        GetItemSpec spec = new GetItemSpec().withPrimaryKey("year", year, "title", title);

        try {
            System.out.println("Attempting to read the item...");
            Item outcome = table.getItem(spec);
            System.out.println("GetItem succeeded: " + outcome);

        }
        catch (Exception e) {
            System.err.println("Unable to read item: " + year + " " + title);
            System.err.println(e.getMessage());
        }

    }
 

public static void retrieveItem(String threadId, String replyDateTime) throws IOException {

        Table table = dynamoDB.getTable(tableName);

        GetItemSpec spec = new GetItemSpec().withPrimaryKey("Id", threadId, "ReplyDateTime", replyDateTime)
            .withConsistentRead(true);

        Item item = table.getItem(spec);

        // Uncompress the reply message and print
        String uncompressed = uncompressString(ByteBuffer.wrap(item.getBinary("ExtendedMessage")));

        System.out.println("Reply message:\n" + " Id: " + item.getString("Id") + "\n" + " ReplyDateTime: "
            + item.getString("ReplyDateTime") + "\n" + " PostedBy: " + item.getString("PostedBy") + "\n" + " Message: "
            + item.getString("Message") + "\n" + " ExtendedMessage (uncompressed): " + uncompressed + "\n");
    }
 

private static void retrieveItem() {
    Table table = dynamoDB.getTable(tableName);

    try {

        Item item = table.getItem("Id", 120,  "Id, ISBN, Title, Authors", null);

        System.out.println("Printing item after retrieving it....");
        System.out.println(item.toJSONPretty());

    } catch (Exception e) {
        System.err.println("GetItem failed.");
        System.err.println(e.getMessage());
    }   

}
 

private static void getBook(int id, String tableName) {

        Table table = dynamoDB.getTable(tableName);

        Item item = table.getItem("Id", // attribute name
            id, // attribute value
            "Id, ISBN, Title, Authors", // projection expression
            null); // name map - don't need this

        System.out.println("GetItem: printing results...");
        System.out.println(item.toJSONPretty());

    }
 

private static void getBook(int id, String tableName) {

        Table table = dynamoDB.getTable(tableName);

        Item item = table.getItem("Id", // attribute name
                id, // attribute value
                "Id, ISBN, Title, Authors", // projection expression
                null); // name map - don't need this

        System.out.println("GetItem: printing results...");
        System.out.println(item.toJSONPretty());

    }