Examples of com.amazonaws.services.dynamodbv2.model.QueryRequest

Package com.amazonaws.services.dynamodbv2.model

Examples of com.amazonaws.services.dynamodbv2.model.QueryRequest

com.amazonaws.services.dynamodbv2.model.QueryRequest
Container for the parameters to the {@link com.amazonaws.services.dynamodbv2.AmazonDynamoDB#query(QueryRequest) Query operation}.
A Query operation directly accesses items from a table using the table primary key, or from an index using the index key. You must provide a specific hash key value. You can narrow the scope of the query by using comparison operators on the range key value, or on the index key. You can use the ScanIndexForward parameter to get results in forward or reverse order, by range key or by index key.

Queries that do not return results consume the minimum read capacity units according to the type of read.

If the total number of items meeting the query criteria exceeds the result set size limit of 1 MB, the query stops and results are returned to the user with a LastEvaluatedKey to continue the query in a subsequent operation. Unlike a Scan operation, a Query operation never returns an empty result set and a LastEvaluatedKey . The LastEvaluatedKey is only provided if the results exceed 1 MB, or if you have used Limit .

To request a strongly consistent result, set ConsistentRead to true.
@see com.amazonaws.services.dynamodbv2.AmazonDynamoDB#query(QueryRequest)

        getClient().updateItem(update);


        inProcessClient.save(PERSISTENCE_PATH);
        createNewInProcessClient().restore(PERSISTENCE_PATH);


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;
        QueryResult result = getClient().query(request);
        Assert.assertNotNull(result.getItems());

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        getClient().updateItem(update);


        inProcessClient.save(PERSISTENCE_PATH);
        createNewInProcessClient().restore(PERSISTENCE_PATH);


        QueryRequest request = new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey));
        QueryResult result = getClient().query(request);


        assertNotNull(result.getItems());

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        getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));


        inProcessClient.save(PERSISTENCE_PATH);
        createNewInProcessClient().restore(PERSISTENCE_PATH);


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;
        QueryResult result = getClient().query(request);
        Assert.assertNotNull(result.getItems());

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        AttributeValue hashKey = setupTableWithSeveralItems();


        inProcessClient.save(PERSISTENCE_PATH);
        createNewInProcessClient().restore(PERSISTENCE_PATH);


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;


        Condition rangeKeyCondition = new Condition();
        List<AttributeValue> attributeValueList = new ArrayList<AttributeValue>();
        attributeValueList.add(createStringAttribute("Range2"));
        rangeKeyCondition.setAttributeValueList(attributeValueList);
        rangeKeyCondition.setComparisonOperator(ComparisonOperator.EQ);
        request.getKeyConditions().put("range", rangeKeyCondition);


        QueryResult result = getClient().query(request);


        Assert.assertNotNull("Null result.", result);
        Assert.assertNotNull("No items returned.", result.getItems());

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    getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));
    getClient().putItem(new PutItemRequest().withItem(createGenericItem(hashKey)).withTableName(tableName));
    getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));
    getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;
    QueryResult result = getClient().query(request);

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        AttributeValue hashKey = createStringAttribute();
        getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));
        getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));
        getClient().putItem(new PutItemRequest().withItem(createGenericItem()).withTableName(tableName));


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;
        Assert.assertNotNull(request);

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    @Test
  public void queryWithHashKeyAndAttributesToGetTest() {
        AttributeValue hashKey = setupTableWithSeveralItems();


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;


    List<String> attrToGet = new ArrayList<String>();
    attrToGet.add("range");
    attrToGet.add("attr1");
    attrToGet.add("bogusAttr");
    request.setAttributesToGet(attrToGet);


        QueryResult result = getClient().query(request);


        Assert.assertNotNull(result);
    Assert.assertNotNull(result.getItems());

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  @Test
  public void queryWithHashKeyAndRangeKeyConditionEQTest() {
        AttributeValue hashKey = setupTableWithSeveralItems();


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;


    Condition rangeKeyCondition = new Condition();
    List<AttributeValue> attributeValueList = new ArrayList<AttributeValue>();
//    attributeValueList.add(new AttributeValue().withN("1"));
    attributeValueList.add(createStringAttribute("Range2"));
    rangeKeyCondition.setAttributeValueList(attributeValueList);
    rangeKeyCondition.setComparisonOperator(ComparisonOperator.EQ);
    request.getKeyConditions().put("range", rangeKeyCondition);


        QueryResult result = getClient().query(request);


        Assert.assertNotNull("Null result.", result);
    Assert.assertNotNull("No items returned.", result.getItems());

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  @Test
  public void queryWithHashKeyAndRangeKeyConditionLTTest() {
        AttributeValue hashKey = setupTableWithSeveralItems();


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;


    Condition rangeKeyCondition = new Condition();
    List<AttributeValue> attributeValueList = new ArrayList<AttributeValue>();
//    attributeValueList.add(new AttributeValue().withN("1"));
    attributeValueList.add(createStringAttribute("Range2"));
    rangeKeyCondition.setAttributeValueList(attributeValueList);
    rangeKeyCondition.setComparisonOperator(ComparisonOperator.LT);
    request.getKeyConditions().put("range", rangeKeyCondition);


        QueryResult result = getClient().query(request);


        Assert.assertNotNull("Null result.", result);
    Assert.assertNotNull("No items returned.", result.getItems());

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  @Test
  public void queryWithHashKeyAndRangeKeyConditionLETest() {
        AttributeValue hashKey = setupTableWithSeveralItems();


        QueryRequest request =
            new QueryRequest()
                .withTableName(tableName)
                .withKeyConditions(createHashKeyCondition("id", hashKey))
                ;


    Condition rangeKeyCondition = new Condition();
    List<AttributeValue> attributeValueList = new ArrayList<AttributeValue>();
//    attributeValueList.add(new AttributeValue().withN("1"));
    attributeValueList.add(createStringAttribute("Range2"));
    rangeKeyCondition.setAttributeValueList(attributeValueList);
    rangeKeyCondition.setComparisonOperator(ComparisonOperator.LE);
    request.getKeyConditions().put("range", rangeKeyCondition);


        QueryResult result = getClient().query(request);


        Assert.assertNotNull("Null result.", result);
    Assert.assertNotNull("No items returned.", result.getItems());

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