如何在基于Java的DynamoDB应用程序中设置TTL

Question

您好，我需要设置时间以编程方式通过AWS Java SDK为DynamoDB中的表生活。可能吗？我知道，TTL功能近期推出 - http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html

UPDATE： 没有特殊annotaion，但我们可以做手工：

@DynamoDBAttribute 
private long ttl; 

并将其配置为在AWS 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

AmazonDynamoDBClient.updateTimeToLive记录here

Answer 2

代码示例here。

//Then set ttl field like below for days in java 
    //ttl 60 days 
    Calendar cal = Calendar.getInstance(); //current date and time  
    cal.add(Calendar.DAY_OF_MONTH, 60); //add days 
    double ttl = (cal.getTimeInMillis()/1000L); 

Answer 3

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); 
 
    }