javascript - 在 dynamodb 中使用 batchWriteItem

Question

我的 dynamo 数据库中有两个表，一个是候选表，另一个是用户表我想在 dynamo 数据库中使用 batchWriteItem 以便将数据添加到表中。

我格式化后的查询如下

var user = {
        userid: usrid,
        role: 'candidate',
        password: vucrypt.encryptpass(pass)
      };

      var canduser = {
        fname: req.body.fname,
        lname: req.body.lname,
        location: req.body.location,
        phone: req.body.phone,
        ccode: req.body.ccode,
        grad: req.body.grad,
        pgrad: req.body.pgrad,
        ograd: req.body.ograd,
        experience: exp,
        linkedin: req.body.linkedin,
        terms: tandc
      };
      canduser = vutools.fixcanduser(canduser);
      canduser.userid = usrid;

      var writes = {
        'users': [{put: user}],
        'candidate': [{put: canduser}],
      };

但如果我使用
dynamodb.batchWriteItem(写入，函数(错误，regdata){
}

它以错误结束。我怎样才能写出正确的查询？我得到的错误是这个。

MultipleValidationErrors: There were 3 validation errors:
* MissingRequiredParameter: Missing required key 'RequestItems' in params
* UnexpectedParameter: Unexpected key 'users' found in params
* UnexpectedParameter: Unexpected key 'candidate' found in params

Answer 1

要在DynamoDB中批量写入，数据必须以dynamodb的方式进行格式化。如果你想用标准的 json 来做，那就去 documentclient。您在下面有一个示例，请记住，dynamobb batchwrite 仅根据请求接受 25 个元素的 mawimum。

所以根据doc你必须有:

<强>1。属性

"ATTRIBUTE_1": { "S": "ATTRIBUTE_1_VALUE" }

根据你的例子:

"role": {"S":"candidate"}

<强>2。元素

每个项目必须有这种格式

      PutRequest: {
        Item: {
            ...,
            "ATTRIBUTE_1": { "S": "ATTRIBUTE_1_VALUE" },
            ...
        }
      }

<强>3。要添加的项目数组

创建一个不超过 25 个元素的项目数组(这是 batchwrite 的 dynamodb 限制)

<强>4。您的请求参数

放在一起

var params = {
  RequestItems: {
    "TABLE_NAME": [
        //the array you just created in step 3
     ]
   }
}

<强>5。要求

ddb.batchWriteItem(params, function(err, data) {
  if (err) {
    console.log("Error", err);
  } else {
    console.log("Success", data);
  }
});

更新

你的例子将是这样的:

var params = {
  "RequestItems": {
    "TABLE_NAME": [
      {
        "PutRequest": {
          Item: {
            "userid": { "N": "usrid" },
            "role": { "S": 'candidate' },
            "password": { "S": vucrypt.encryptpass(pass) }
          }
        }
      }
    ],
    "TABLE_NAME2": [
      {
        "PutRequest": {
          Item: {
            "fname": {
              "S": req.body.fname
            },
            "lname": {
              "S": req.body.lname
            },
            "location": {
              "S": req.body.location
            },
            "phone": {
              "S": req.body.phone
            },
            "ccode": {
              "S": req.body.ccode
            },
            "grad": {
              "S": req.body.grad
            },
            "pgrad": {
              "S": req.body.pgrad
            },
            "ograd": {
              "S": req.body.ograd
            },
            "experience": {
              "S": exp
            },
            "linkedin": {
              "S": req.body.linkedin
            },
            "terms": {
              "S": tandc
            }
          }
        }
      }
    ]
  }
}