java - 如何在基于 Java 的 DynamoDB 应用程序中设置 TTL

Question

您好，我需要通过 AWS Java SDK 以编程方式为 DynamoDB 中的表设置时间。是否可以？我知道最近引入了 TTL 功能 - http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html

更新: 没有特殊的注释，但是我们可以手动完成:

@DynamoDBAttribute
private long ttl;

并在 AWS 中将其配置为 ttl - http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/time-to-live-ttl-how-to.html

long now = Instant.now().getEpochSecond(); // unix time
long ttl = 60 * 60 * 24; // 24 hours in sec
setTtl(ttl + now); // when object will be expired

Answer 1

http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/time-to-live-ttl-how-to.html

    public void function(final AmazonDynamoDB client, final String tableName, final String ttlField){

        //table created now enabling TTL
        final UpdateTimeToLiveRequest req = new UpdateTimeToLiveRequest();
        req.setTableName(tableName);

        final TimeToLiveSpecification ttlSpec = new TimeToLiveSpecification();
        ttlSpec.setAttributeName(ttlField);
        ttlSpec.setEnabled(true);
        req.withTimeToLiveSpecification(ttlSpec);

        client.updateTimeToLive(req);
    }