如何使用AWS DynamoDB DocumentClient将项目写入DynamoDb？ [英] How do I write an item to a DynamoDb with the AWS DynamoDB DocumentClient?

问题描述

我在使用AWS DynamoDb JS SDK v2.4.9时遇到了麻烦。我想使用DocumentClient类，而不是较低级的DynamoDb类，但无法使其正常工作。

I'm having trouble with the AWS DynamoDb JS SDK v2.4.9. I want to use the DocumentClient class as opposed to the lower level DynamoDb class, but can't get it working.

这可行：

function testPutItem( callback ) {

    var tableName = 'todos';

    var params = {
        TableName: tableName,
        Item: {
            user_id: { S : userId },
            id: { N : msFromEpoch },        // ms from epoch
            title: { S : makeRandomStringWithLength(16) },
            completed: { BOOL: false }
        }
    };

    var dynamodb = new AWS.DynamoDB();
    dynamodb.putItem(params, function(err, data) {
      if (err) console.log(err, err.stack); // an error occurred
      else {
            console.log(data);           // successful response
            if (callback) callback(data);
        }
    });
}

这不起作用，并给出错误 InvalidParameterType：期望params.Item [attribute]是每个属性的结构-就像DocumentClient期望的输入与DynamoDb一样：

This does not work and gives the error InvalidParameterType: Expected params.Item[attribute] to be a structure for each attribute--as if DocumentClient is expecting the same input as DynamoDb:

function testPutItem( callback ) {

    var tableName = 'todos';

    var params = {
        TableName: tableName,
        Item: {
            user_id: userId,
            id: msFromEpoch,
            title: makeRandomStringWithLength(16),
            completed: false
        }
    };
    console.log(params);

    var docClient = new AWS.DynamoDB.DocumentClient({region: 'us-east-1'});
    docClient.put(params, function(err, data) {
      if (err) console.log(err, err.stack); // an error occurred
      else {
            console.log(data);           // successful response
            if (callback) callback(data);
        }
    });
}

有人知道我在做什么错吗？

Does anyone have any idea what I am doing wrong?

推荐答案

我曾经遇到过同样的问题，

I used to have the same issue,

请先尝试使用一个简单的对象，因为它是由于属性中的某些特殊字符引起的，请参见我的示例：

please try with a simple object first, cause it's due to some special characters in your attributes, see my example :

这会产生错误

InvalidParameterType：期望的params.Item [attribute]为结构

InvalidParameterType: Expected params.Item[attribute] to be a structure

 var Item = {
  domain: "knewtone.com",
  categorie: "<some HTML Object stuff>",
  title: "<some HTML stuff>",
  html: "<some HTML stuff>""
};

当我将HTML内容替换为格式化的HTML（简单字符）后，它起作用了

but when i replace the HTML stuff with a formated Html, simple characters , it works

var Item = {
  domain: "knewtone.com",
  categorie: $(categorie).html(),
  title: $(title).html(),
  html: $(html).html()
};

这篇关于如何使用AWS DynamoDB DocumentClient将项目写入DynamoDb？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！