如何通过复合键获取项？

Question

const dynamoDB = new AWS.DynamoDB.DocumentClient();
    var params: any = {};
    params.TableName = 'StockDailyCandles';
    var key = { 'symbol': 'AAPL', 'datetime': '640590008898' }; // example timestamp
    params.Key = key;

    var x = await dynamoDB.get(params).promise();
    return (x.Item ? true : false);

表的复合键是symbol和“datetime”（它只是一个时间戳）。这两列在dynamodb中都设置为字符串。

我收到的错误是：提供的键元素与模式不匹配

Answer 1

请像这样尝试：

const AWS = require("aws-sdk");

AWS.config.update({ region: "us-west-2" });

const documentClient = new AWS.DynamoDB.DocumentClient();

async function getItem() {
  const params = {
    TableName: "RetailDatabase",
    Key: {
      pk: "[e-mail]",
      sk: "metadata",
    },
  };

  const response = await documentClient.get(params).promise();
  return response;
}

getItem()
  .then((data) =>
    console.log("GetItem succeeded:", JSON.stringify(data, null, 2))
  )
  .catch((error) => console.error(JSON.stringify(error, null, 2)));