javascript - 如何从 node.js 访问 dynamodb

Question

我想根据特定的主键值从 Node.js 访问 Amazon Data 服务器的数据。数据以以下形式提供:

{
  "Count": 9862,
  "Items": [
    {
      "Admin": {
        "S": "false"
      },
      "UserId": {
        "S": "e9633477-978e-4956-ab34-cc4b8bbe4adf"
      },
      "Age": {
        "N": "76.24807963806055"
      },
      "Promoted": {
        "S": "true"
      },
      "UserName": {
        "S": "e9633477"
      },
      "Registered": {
        "S": "true"
      }
    },
    {
      "Admin": {
        "S": "false"
      },
      "UserId": {
        "S": "acf3eff7-36d6-4c3f-81dd-76f3a8071bcf"
      },
      "Age": {
        "N": "64.79224276370684"
      },
      "Promoted": {
        "S": "true"
      },
      "UserName": {
        "S": "acf3eff7"
      },
      "Registered": {
        "S": "true"
      }
    },

每当我用代码发出请求时:

app.get('/Mydetails/:tablename/:id', function(req, res){
console.log('Table is ' + req.params.tablename);


var element = {TableName: req.params.tablename, Key:{UserID:{"S": '"'+req.params.id+'"' }}};
 console.log('Id is "' + req.params.id + '"');
dynamodb.getItem(element, function(err, data){
    if(err){
        console.log('Error occurred: '+err);
    }else{
     console.log('succeed');
        res.json(data);
    }
});

然后它给出了以下错误:

**ValidationException: The provided key element does not match the schema.**

不过我也试过这个-

var element = {TableName: req.params.tablename, Key:{UserId:{"S": +req.params.id}}};

有什么想法吗？任何帮助将不胜感激。

Answer 1

如果范围键存在于“Key”中，您还必须为参数传递范围键

例子 应该是

Key:{'thePrimaryKey':{ "S": 'primaryKey' }, 'theRangeKey': {'S': 'rangeKey'} }

希望这对您有所帮助!