Question

我正在尝试在 Lambda中为DynamoDB表创建查询。

我遵循了aws开发人员手册中的说明和示例，但仍然出现错误

//+++++++++++++++++++++++++++++++++++++++++++
//The database Structure

 "Table": {
    "AttributeDefinitions": [
      {
        "AttributeName": "Score",
        "AttributeType": "N"
      },
      {
        "AttributeName": "gtin_RecBook",
        "AttributeType": "S"
      },
      {
        "AttributeName": "gtin_RefBook",
        "AttributeType": "S"
      }
    ],
    "TableName": "Recommendation_test_2",
    "KeySchema": [
      {
        "AttributeName": "gtin_RefBook",
        "KeyType": "HASH"
      },
      {
        "AttributeName": "gtin_RecBook",
        "KeyType": "RANGE"
      }
    ]
}

//+++++++++++++++++++++++++++++++++++++++++++
// The Lambda Code

const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB({region:'eu-central-1', apiVersion:'2012-08-10'});

exports.handler = (event, context, callback) => {
    const params = {
        TableName: "Recommendation_test_2",
        KeyConditionExpression: "gtin_RefBook = :a",
        ExpressionAttributeValues: {
            ":a": "9783453471092"
        }
    };
    dynamodb.query(params, function(err, data){
      if (err) {
          console.log(err);
          callback(err);
      }  else{
          console.log(data);
          callback(null, data);
      }
    });
};

该数据库已填充，应该会提供一些结果。

但是Lambda会引发以下错误： “ errorMessage”：“存在14个验证错误：\ n * InvalidParameterType：预期的params.ExpressionAttributeValues ['：a']为结构”

能否请您告诉我要进行哪些更改以使查询正常工作？

Answer 1

您需要使用DynamoDB Document Client或将ExpresionAttributeValue更改为

ExpressionAttributeValues: {
  ":a": {
    "S": "9783453471092"
  }
}

DynamoDB查询显示UnepectedParameter

1 个答案: