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)

        }
        return parallelScanRequests;
    }


    private <T> QueryRequest  createQueryRequestFromExpression(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        QueryRequest queryRequest = new QueryRequest();
        queryRequest.setConsistentRead(queryExpression.isConsistentRead());
        queryRequest.setTableName(getTableName(clazz, config));
        queryRequest.setIndexName(queryExpression.getIndexName());


        Map<String, Condition> keyConditions = getHashKeyEqualsConditions(queryExpression.getHashKeyValues());


        Map<String, Condition> rangeKeyConditions = queryExpression.getRangeKeyConditions();
        if (null != rangeKeyConditions) {
            processRangeKeyConditions(clazz, queryRequest, rangeKeyConditions);
            keyConditions.putAll(rangeKeyConditions);
        }


        queryRequest.setKeyConditions(keyConditions);
        queryRequest.setScanIndexForward(queryExpression.isScanIndexForward());
        queryRequest.setLimit(queryExpression.getLimit());
        queryRequest.setExclusiveStartKey(queryExpression.getExclusiveStartKey());


        return queryRequest;
    }

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     * @see PaginatedQueryList
     */
    public <T> PaginatedQueryList<T> query(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        QueryRequest queryRequest = createQueryRequestFromExpression(clazz, queryExpression, config);


        QueryResult queryResult = db.query(applyUserAgent(queryRequest));
        return new PaginatedQueryList<T>(this, clazz, db, queryRequest, queryResult);
    }

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     *         item data.
     */
    public <T> int count(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        QueryRequest queryRequest = createQueryRequestFromExpression(clazz, queryExpression, config);
        queryRequest.setSelect(Select.COUNT);


        // Count queries can also be truncated for large datasets
        int count = 0;
        QueryResult queryResult = null;
        do {
            queryResult = db.query(applyUserAgent(queryRequest));
            count += queryResult.getCount();
            queryRequest.setExclusiveStartKey(queryResult.getLastEvaluatedKey());
        } while (queryResult.getLastEvaluatedKey() != null);


        return count;
    }

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        return scanRequest;
    }


    private <T> QueryRequest  createQueryRequestFromExpression(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        QueryRequest queryRequest = new QueryRequest();
        queryRequest.setConsistentRead(queryExpression.isConsistentRead());
        queryRequest.setTableName(getTableName(clazz, config));
        queryRequest.setIndexName(queryExpression.getIndexName());
                
        Map<String, Condition> keyConditions = getHashKeyEqualsConditions(queryExpression.getHashKeyValues());
        
        Map<String, Condition> rangeKeyConditions = queryExpression.getRangeKeyConditions();
        if (null != rangeKeyConditions) {
          processRangeKeyConditions(clazz, queryRequest, rangeKeyConditions);
          keyConditions.putAll(rangeKeyConditions);
        }
        
        queryRequest.setKeyConditions(keyConditions);
        queryRequest.setScanIndexForward(queryExpression.isScanIndexForward());
        queryRequest.setLimit(queryExpression.getLimit());
        queryRequest.setExclusiveStartKey(queryExpression.getExclusiveStartKey());


        return queryRequest;
    }

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                      : new LinkedHashMap<String, AttributeValue>(startKey);
    }


    @Override
    public Page<Item, QueryOutcome> firstPage() {
        QueryRequest request = spec.getRequest();
        request.setExclusiveStartKey(startKey);
        request.setLimit(InternalUtils.minimum(
                spec.getMaxResultSize(),
                spec.getMaxPageSize()));
        QueryResult result = client.query(request);
        QueryOutcome outcome = new QueryOutcome(result);
        setLastLowLevelResult(outcome);

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    }


    protected ItemCollection<QueryOutcome> doQuery(QuerySpec spec) {
        // set the table name
        String tableName = getTable().getTableName();
        QueryRequest req = spec.getRequest().withTableName(tableName);
        // hash key
        final KeyAttribute hashKey = spec.getHashKey();
        req.addKeyConditionsEntry(hashKey.getName(),
                new Condition()
                .withComparisonOperator(ComparisonOperator.EQ)
                .withAttributeValueList(InternalUtils.toAttributeValue(hashKey.getValue()))
        );
        // range key condition
        RangeKeyCondition rangeKeyCond = spec.getRangeKeyCondition();
        if (rangeKeyCond != null) {
            KeyConditions keyCond = rangeKeyCond.getKeyCondition();
            if (keyCond == null)
                throw new IllegalArgumentException("key condition not specified in range key condition");
            Object[] values = rangeKeyCond.getValues();
            if (values == null)
                throw new IllegalArgumentException("key condition values not specified in range key condition");
            req.addKeyConditionsEntry(rangeKeyCond.getAttrName(),
                    new Condition()
                    .withComparisonOperator(keyCond.toComparisonOperator())
                    .withAttributeValueList(InternalUtils.toAttributeValues(values))
            );
        }
        // query filters;
        Collection<QueryFilter> filters = spec.getQueryFilters();
        if (filters != null) {
            req.setQueryFilter(InternalUtils.toAttributeConditionMap(filters));
        }


        // set up the start key, if any
        Collection<KeyAttribute> startKey = spec.getExclusiveStartKey();
        if (startKey != null)
            req.setExclusiveStartKey(InternalUtils.toAttributeValueMap(startKey));


        // set up the value map, if any (when expression API is used)
        final Map<String,AttributeValue> attrValMap = InternalUtils.fromSimpleMap(spec.getValueMap());
        // set up expressions, if any
        req.withConditionalOperator(spec.getConditionalOperator())
            .withFilterExpression(spec.getFilterExpression())
            .withProjectionExpression(spec.getProjectionExpression())
            .withExpressionAttributeNames(spec.getNameMap())
            .withExpressionAttributeValues(attrValMap)
            ;

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     * @see PaginationLoadingStrategy
     */
    public <T> PaginatedQueryList<T> query(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        QueryRequest queryRequest = createQueryRequestFromExpression(clazz, queryExpression, config);


        QueryResult queryResult = db.query(applyUserAgent(queryRequest));
        return new PaginatedQueryList<T>(this, clazz, db, queryRequest, queryResult, config.getPaginationLoadingStrategy(), config);
    }

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     *            default provided at object construction.
     */
    public <T> QueryResultPage<T> queryPage(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        QueryRequest queryRequest = createQueryRequestFromExpression(clazz, queryExpression, config);


        QueryResult scanResult = db.query(applyUserAgent(queryRequest));
        QueryResultPage<T> result = new QueryResultPage<T>();
        List<AttributeTransformer.Parameters<T>> parameters =
            toParameters(scanResult.getItems(), clazz, config);

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     *         item data.
     */
    public <T> int count(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        QueryRequest queryRequest = createQueryRequestFromExpression(clazz, queryExpression, config);
        queryRequest.setSelect(Select.COUNT);


        // Count queries can also be truncated for large datasets
        int count = 0;
        QueryResult queryResult = null;
        do {
            queryResult = db.query(applyUserAgent(queryRequest));
            count += queryResult.getCount();
            queryRequest.setExclusiveStartKey(queryResult.getLastEvaluatedKey());
        } while (queryResult.getLastEvaluatedKey() != null);


        return count;
    }

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        }
        return parallelScanRequests;
    }


    private <T> QueryRequest createQueryRequestFromExpression(Class<T> clazz, DynamoDBQueryExpression<T> queryExpression, DynamoDBMapperConfig config) {
        QueryRequest queryRequest = new QueryRequest();
        queryRequest.setConsistentRead(queryExpression.isConsistentRead());
        queryRequest.setTableName(getTableName(clazz, config));
        queryRequest.setIndexName(queryExpression.getIndexName());


        // Hash key (primary or index) conditions
        Map<String, Condition> hashKeyConditions = getHashKeyEqualsConditions(queryExpression.getHashKeyValues());
        // Range key (primary or index) conditions
        Map<String, Condition> rangeKeyConditions = queryExpression.getRangeKeyConditions();
        processKeyConditions(clazz, queryRequest, hashKeyConditions, rangeKeyConditions);


        queryRequest.setScanIndexForward(queryExpression.isScanIndexForward());
        queryRequest.setLimit(queryExpression.getLimit());
        queryRequest.setExclusiveStartKey(queryExpression.getExclusiveStartKey());
        queryRequest.setQueryFilter(queryExpression.getQueryFilter());
        queryRequest.setConditionalOperator(queryExpression.getConditionalOperator());
        queryRequest.setRequestMetricCollector(config.getRequestMetricCollector());


        return queryRequest;
    }

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