使用 DynamoDB table 的 IN 查询不工作

Question

列表字段中带有 IN 的 ScanRequest 与 DynamoDB 中的条目不匹配。代码：

                Map<String, AttributeValue> userAttributeValues = new HashMap<>();
                userAttributeValues.put(":topic1", new AttributeValue().withS("5"));
                userAttributeValues.put(":topic2", new AttributeValue().withS("11"));

                ScanRequest scanRequest = new ScanRequest()
                .withTableName("user")
                .withFilterExpression("subscribedTopics IN (:topic1, :topic2)")
                .withProjectionExpression("userId")
                .withExpressionAttributeValues(userAttributeValues);

                ScanResult result = dynamoDBClient.scan(scanRequest);

                System.out.println("Number of results: " + result.getCount());

                for (Map<String, AttributeValue> userItemsMap : result.getItems()) {
                    AttributeValue userIdAttributeValue = userItemsMap.get("userId");
                    String userId = userIdAttributeValue.getS();
                }

具有有效条目的用户项目

{ "subscribedTopics": [ "2", "5", "8", "1", "3", "4", "6", "7", "11" ], "userId": "Andrew.Green" }

Answer 1

使用了 CONTAINS 和 OR 的组合并且有效。

ScanRequest scanRequest = new ScanRequest()
.withTableName("user")
.withFilterExpression("contains(subscribedTopics, :topic1) or contains(subscribedTopics, :topic2)")
.withProjectionExpression("userId")
.withExpressionAttributeValues(userAttributeValues);enter code here

使用 DynamoDB table 的 IN 查询不工作

IN query with DynamoDB table is not working

java

amazon-dynamodb

dynamodb-queries