我想弄清楚如何在源数据包含映射值的项目上执行原子更新,并且这些映射的键是动态的。DynamoDB,使用AWS Lambda(NodeJS运行时)映射值的动态原子更新
如果你看看下面的示例数据,我想知道如何在同一个项目上对BSSentDestIp和BSRecvDestIp中的值进行原子更新。我正在阅读文档,但我能找到的唯一东西是list_append,这将给我留下一个附加键/值列表,我将需要遍历和总结。输入数据的
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html
实施例:
{
"RecordId": 31,
"UUID": "170ae748-f8cf-4df9-6e08-c0c8a5f029d4",
"UserId": "username",
"DeviceId": "e0:cb:4e:53:ae:ff",
"ExpireTime": 1501445446,
"StartTime": 1501441846,
"EndTime": 1501441856,
"MinuteId": 10,
"PacketCount": 1028,
"ByteSum": 834111,
"BSSent": 98035,
"BSRecv": 736076,
"BSSentDestIp": {
"151.101.129.69": 2518,
"192.168.1.254": 4780,
"192.168.1.80": 14089,
"192.33.31.162": 2386,
"54.239.30.232": 21815,
"54.239.31.129": 6423,
"54.239.31.69": 3255,
"54.239.31.83": 18447,
"98.138.253.109": 3020
},
"BSRecvDestIp": {
"151.101.129.69": 42414,
"151.101.57.174": 20792,
"192.230.66.108": 130175,
"192.33.31.162": 56398,
"23.194.140.100": 26209,
"54.239.26.209": 57210,
"54.239.31.129": 188747,
"54.239.31.69": 41115,
"98.138.253.109": 111775
}
}
经由LAMBDA执行更新手摇
的NodeJS功能:
function updateItem(UserIdValue, MinuteIdValue) {
var UpdateExpressionString = "set PacketCount = PacketCount + :PacketCount, \
ByteSum = ByteSum + :ByteSum, \
BSSent = BSSent + :BSSent, \
BSRecv = BSRecv + :BSRecv";
var params = {
TableName: gDynamoTable,
Key: {
"UserId": UserIdValue,
"MinuteId": MinuteIdValue
},
UpdateExpression: UpdateExpressionString,
ExpressionAttributeValues: {
":PacketCount": gRecordObject.PacketCount,
":ByteSum": gRecordObject.ByteSum,
":BSSent": gRecordObject.BSSent,
":BSRecv": gRecordObject.BSRecv
},
ReturnValues: "UPDATED_NEW"
};
dynamo.updateItem(params, function(err, data) {
if (err) {
console.log("updateItem Error: " + err);
} else {
console.log("updateItem Success: " + JSON.stringify(data));
}
});
}