我正在尝试利用 aws 和 dynamo db 的异步/等待功能。下面是如何在 async wait 之前放置对象的示例,正如您在回调中看到的,您可以访问包含放置对象的数据。然而,在使用 async 和 Promise 的第二个代码块中,结果是一个空对象,有什么想法吗?
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStarted.NodeJs.03.html https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStarted.NodeJs.03.html
无承诺版本
var docClient = new AWS.DynamoDB.DocumentClient();
var table = "Movies";
var year = 2015;
var title = "The Big New Movie";
var params = {
TableName:table,
Item:{
"year": year,
"title": title,
"info":{
"plot": "Nothing happens at all.",
"rating": 0
}
}
};
console.log("Adding a new item...");
docClient.put(params, function(err, data) {
if (err) {
console.error("Unable to add item. Error JSON:", JSON.stringify(err, null, 2));
} else {
console.log("Added item:", JSON.stringify(data, null, 2));
}
});
Promise 异步版本 - 假设包装函数被标记为异步
var docClient = new AWS.DynamoDB.DocumentClient();
var table = "Movies";
var year = 2015;
var title = "The Big New Movie";
var params = {
TableName:table,
Item:{
"year": year,
"title": title,
"info":{
"plot": "Nothing happens at all.",
"rating": 0
}
}
};
const result: any = await dynamoDb.put(params).promise()
console.log(result)