Example usage for com.amazonaws.services.dynamodbv2.model GetItemRequest GetItemRequest

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.model GetItemRequest GetItemRequest.

Prototype

public GetItemRequest() 

Source Link

Document

Default constructor for GetItemRequest object.

Usage

From source file:DynamoDB.java

License:Open Source License

public boolean getItem(Map<String, AttributeValue> item, String id, String message) {
    //GetItemResult result = dynamoDB.getItem(tableName, item);       
    GetItemRequest getItemRequest = new GetItemRequest().withTableName(tableName).withKey(item);
    GetItemResult result = dynamoDB.getItem(getItemRequest);
    if (result.getItem() != null) {
        //addItem(id,message);
        System.out.println("item present");
        return true;
    }//from   ww w .jav  a 2s  . co  m
    //System.out.println(result.getItem());
    else {
        return false;
    }
}

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From source file:VideoServlet.java

private static String getItem(String keyVal) {

    Map<String, AttributeValue> key = new HashMap<String, AttributeValue>();
    key.put("ID", new AttributeValue(keyVal));

    GetItemRequest getItemRequest = new GetItemRequest().withTableName(TABLENAME).withKey(key);

    GetItemResult item = dynamoDBClient.getItem(getItemRequest);

    System.out.println("Get Result: " + item);
    return item.toString();
}

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From source file:amazon.dynamodb.model.GetPointRequest.java

License:Open Source License

public GetPointRequest(GeoPunto geoPoint, AttributeValue rangeKeyValue) {
    getItemRequest = new GetItemRequest();
    getItemRequest.setKey(new HashMap<String, AttributeValue>());

    this.geoPoint = geoPoint;
    this.rangeKeyValue = rangeKeyValue;
}

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From source file:aws.example.dynamodb.GetItem.java

License:Open Source License

public static void main(String[] args) {
    final String USAGE = "\n" + "Usage:\n" + "    GetItem <table> <name> [projection_expression]\n\n"
            + "Where:\n" + "    table - the table to get an item from.\n" + "    name  - the item to get.\n\n"
            + "You can add an optional projection expression (a quote-delimited,\n"
            + "comma-separated list of attributes to retrieve) to limit the\n"
            + "fields returned from the table.\n\n" + "Example:\n" + "    GetItem HelloTable World\n"
            + "    GetItem SiteColors text \"default, bold\"\n";

    if (args.length < 2) {
        System.out.println(USAGE);
        System.exit(1);// w  w w  .ja va  2 s.co m
    }

    String table_name = args[0];
    String name = args[1];
    String projection_expression = null;

    // if a projection expression was included, set it.
    if (args.length == 3) {
        projection_expression = args[2];
    }

    System.out.format("Retrieving item \"%s\" from \"%s\"\n", name, table_name);

    HashMap<String, AttributeValue> key_to_get = new HashMap<String, AttributeValue>();

    key_to_get.put("Name", new AttributeValue(name));

    GetItemRequest request = null;
    if (projection_expression != null) {
        request = new GetItemRequest().withKey(key_to_get).withTableName(table_name)
                .withProjectionExpression(projection_expression);
    } else {
        request = new GetItemRequest().withKey(key_to_get).withTableName(table_name);
    }

    final AmazonDynamoDBClient ddb = new AmazonDynamoDBClient();

    try {
        Map<String, AttributeValue> returned_item = ddb.getItem(request).getItem();
        if (returned_item != null) {
            Set<String> keys = returned_item.keySet();
            for (String key : keys) {
                System.out.format("%s: %s\n", key, returned_item.get(key).toString());
            }
        } else {
            System.out.format("No item found with the key %s!\n", name);
        }
    } catch (AmazonServiceException e) {
        System.err.println(e.getErrorMessage());
        System.exit(1);
    }
}

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From source file:com.amazon.janusgraph.diskstorage.dynamodb.AbstractDynamoDbStore.java

License:Open Source License

protected GetItemRequest createGetItemRequest() {
    return new GetItemRequest().withTableName(tableName).withConsistentRead(forceConsistentRead)
            .withReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL);
}

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From source file:com.amediamanager.dao.DynamoDbUserDaoImpl.java

License:Apache License

@Override
public User find(String email) throws DataSourceTableDoesNotExistException {
    try {/* ww  w . j a  v a2 s  .c  om*/

        User user = null;

        // Create a request to find a User by email address
        GetItemRequest getItemRequest = new GetItemRequest()
                .withTableName(config.getProperty(ConfigurationSettings.ConfigProps.DDB_USERS_TABLE))
                .addKeyEntry(HASH_KEY_NAME, new AttributeValue(email));

        // Issue the request to find the User in DynamoDB
        GetItemResult getItemResult = dynamoClient.getItem(getItemRequest);

        // If an item was found
        if (getItemResult.getItem() != null) {
            // Marshal the Map<String, AttributeValue> structure returned in
            // the
            // GetItemResult to a User object
            user = getUserFromMap(getItemResult.getItem());
        }

        return user;

    } catch (ResourceNotFoundException rnfe) {

        // The ResourceNotFoundException method is thrown by the getItem()
        // method
        // if the DynamoDB table doesn't exist. This exception is re-thrown
        // as a
        // custom, more specific DataSourceTableDoesNotExistException that
        // users
        // of this DAO understand.
        throw new DataSourceTableDoesNotExistException(
                config.getProperty(ConfigurationSettings.ConfigProps.DDB_USERS_TABLE));
    }
}

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From source file:com.github.sdmcraft.slingdynamo.demo.App.java

License:Open Source License

/**
 * Main2.//w w  w  . j  a  v a 2  s .  co  m
 *
 * @param args the args
 */
public static void main2(String[] args) {
    init();

    Map<String, AttributeValue> key = new HashMap<String, AttributeValue>();
    key.put("name", new AttributeValue().withS("Airplane"));

    GetItemRequest getItemRequest = new GetItemRequest().withTableName("my-favorite-movies-table").withKey(key)
            .withAttributesToGet(Arrays.asList("name", "fans", "rating", "year"));

    GetItemResult result = dynamoDB.getItem(getItemRequest);

    // Check the response.
    System.out.println("Printing item after retrieving it....");
    printItem(result.getItem());
}

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From source file:com.grublr.geo.model.GetPointRequest.java

License:Open Source License

public GetPointRequest(GeoPoint geoPoint, AttributeValue rangeKeyValue) {
    getItemRequest = new GetItemRequest();
    getItemRequest.setKey(new HashMap<String, AttributeValue>());

    this.geoPoint = geoPoint;
    this.rangeKeyValue = rangeKeyValue;
}

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From source file:com.lvl6.mobsters.dynamo.setup.TransactionExamples.java

License:Open Source License

/**
 * This example demonstrates two transactions attempting to write to the same item.  
 * Only one transaction will go through.
 *///from ww  w  .j a v a  2s . c  o m
public void conflictingTransactions() {
    print("\n*** conflictingTransactions() ***\n");
    // Start transaction t1
    Transaction t1 = txManager.newTransaction();

    // Construct a primary key of an item that will overlap between two transactions.
    Map<String, AttributeValue> item1Key = new HashMap<String, AttributeValue>();
    item1Key.put(EXAMPLE_TABLE_HASH_KEY, new AttributeValue("conflictingTransactions_Item1"));
    item1Key = Collections.unmodifiableMap(item1Key);

    // Add a new PutItem request to the transaction object (instead of on the AmazonDynamoDB client)
    // This will eventually get rolled back when t2 tries to work on the same item
    Map<String, AttributeValue> item1T1 = new HashMap<String, AttributeValue>(item1Key);
    item1T1.put("WhichTransaction?", new AttributeValue("t1"));
    print("T1 - Put item: " + item1T1);
    t1.putItem(new PutItemRequest().withTableName(EXAMPLE_TABLE_NAME).withItem(item1T1));
    print("T1 - At this point Item1 is in the table, but is not yet committed");

    Map<String, AttributeValue> item2T1 = new HashMap<String, AttributeValue>();
    item2T1.put(EXAMPLE_TABLE_HASH_KEY, new AttributeValue("conflictingTransactions_Item2"));
    print("T1 - Put a second, non-overlapping item: " + item2T1);
    t1.putItem(new PutItemRequest().withTableName(EXAMPLE_TABLE_NAME).withItem(item2T1));
    print("T1 - At this point Item2 is also in the table, but is not yet committed");

    // Start a new transaction t2
    Transaction t2 = txManager.newTransaction();

    Map<String, AttributeValue> item1T2 = new HashMap<String, AttributeValue>(item1Key);
    item1T1.put("WhichTransaction?", new AttributeValue("t2 - I win!"));
    print("T2 - Put item: " + item1T2);
    t2.putItem(new PutItemRequest().withTableName(EXAMPLE_TABLE_NAME).withItem(item1T2));
    print("T2 - At this point Item1 from t2 is in the table, but is not yet committed. t1 was rolled back.");

    // To prove that t1 will have been rolled back by this point, attempt to commit it.
    try {
        print("Attempting to commit t1 (this will fail)");
        t1.commit();
        throw new RuntimeException("T1 should have been rolled back. This is a bug.");
    } catch (TransactionRolledBackException e) {
        print("Transaction t1 was rolled back, as expected");
        t1.delete(); // Delete it, no longer needed
    }

    // Now put a second item as a part of t2
    Map<String, AttributeValue> item3T2 = new HashMap<String, AttributeValue>();
    item3T2.put(EXAMPLE_TABLE_HASH_KEY, new AttributeValue("conflictingTransactions_Item3"));
    print("T2 - Put item: " + item3T2);
    t2.putItem(new PutItemRequest().withTableName(EXAMPLE_TABLE_NAME).withItem(item3T2));
    print("T2 - At this point Item3 is in the table, but is not yet committed");

    print("Committing and deleting t2");
    t2.commit();

    t2.delete();

    // Now to verify, get the items Item1, Item2, and Item3.
    // More on read operations later. 
    GetItemResult result = txManager.getItem(
            new GetItemRequest().withTableName(EXAMPLE_TABLE_NAME).withKey(item1Key),
            IsolationLevel.UNCOMMITTED);
    print("Notice that t2's write to Item1 won: " + result.getItem());

    result = txManager.getItem(new GetItemRequest().withTableName(EXAMPLE_TABLE_NAME).withKey(item3T2),
            IsolationLevel.UNCOMMITTED);
    print("Notice that t2's write to Item3 also went through: " + result.getItem());

    result = txManager.getItem(new GetItemRequest().withTableName(EXAMPLE_TABLE_NAME).withKey(item2T1),
            IsolationLevel.UNCOMMITTED);
    print("However, t1's write to Item2 did not go through (since Item2 is null): " + result.getItem());
}

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From source file:com.lvl6.mobsters.dynamo.setup.TransactionExamples.java

License:Open Source License

/**
 * This example shows that reads can be performed in a transaction, and read locks can be upgraded to write locks. 
 *//* w w  w.j  a v a 2s.  c  om*/
public void readThenWrite() {
    print("\n*** readThenWrite() ***\n");

    Transaction t1 = txManager.newTransaction();

    // Perform a GetItem request on the transaction
    print("Reading Item1");
    Map<String, AttributeValue> key1 = new HashMap<String, AttributeValue>();
    key1.put(EXAMPLE_TABLE_HASH_KEY, new AttributeValue("Item1"));

    Map<String, AttributeValue> item1 = t1
            .getItem(new GetItemRequest().withKey(key1).withTableName(EXAMPLE_TABLE_NAME)).getItem();
    print("Item1: " + item1);

    // Now call UpdateItem to add a new attribute.
    // Notice that the library supports ReturnValues in writes
    print("Updating Item1");
    Map<String, AttributeValueUpdate> updates = new HashMap<String, AttributeValueUpdate>();
    updates.put("Color",
            new AttributeValueUpdate().withAction(AttributeAction.PUT).withValue(new AttributeValue("Green")));

    item1 = t1.updateItem(new UpdateItemRequest().withKey(key1).withTableName(EXAMPLE_TABLE_NAME)
            .withAttributeUpdates(updates).withReturnValues(ReturnValue.ALL_NEW)).getAttributes();
    print("Item1 is now: " + item1);

    t1.commit();

    t1.delete();
}

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