如何从CosmosDB特定日期删除记录

问题描述

我有一个集合 activity ，其中包含一个字段 activityDate ，其中包含日期，如 2017-02-24T19:04:18Z

I have a collection activities it contains a field activityDate which contain date like 2017-02-24T19:04:18Z

我想从此集合中删除所有早于 numberOfDays 的记录.

I want to delete all record from this collection which are older that numberOfDays.

我正在通过编写cosmosdb存储过程来执行此任务

I am performing this task by writing cosmosdb stored procedure

我尝试

var query = 'SELECT * FROM activities a WHERE a.activityDate > = "' + numberOfDays+ '"';

我在执行查询时遇到问题，因为它在语法上不正确

I am facing problem executing the query as it's not syntactically correct

或者可以有另一种方式.

Or there can be some another way of doing it.

先谢谢了.

推荐答案

以下是我的问题的解决方案:

Here is the solution for my problem:

// SAMPLE STORED PROCEDURE
function deleteActivitiesBackDate(numberOfDays) {
  var context = getContext();
  var collection = context.getCollection();
  var link = collection.getSelfLink();
  var response = context.getResponse();

 //validate inputs
  if(!numberOfDays || (typeof numberOfDays != "string")){
    return errorResponse(400, (!numberOfDays) ? "numberOfDays is Undefined":"String type is expected for numberOfDays.");
  }

 var targetDate = new Date();

 targetDate.setDate(targetDate.getDate() - numberOfDays);
 console.log("targetDate is "+targetDate);


  var query = 'SELECT * FROM activities a WHERE a.activityDate < "' + targetDate+ '"';
  var run = collection.queryDocuments(link, query, {}, callback);
  function callback(err, docs) {
    if (err){
        return errorResponse(400, err.message);
    }
    if (docs.length > 0){
        deleteDoc(docs);
    }else {
        return errorResponse(400, "The document was not found.");
    }
  }

  if (!run) {
      return errorResponse(400, "The document could not be deleted.");
  }

  function deleteDoc(document) {
    var docDeleted = collection.deleteDocument(document._self, function(err, result){
        if (err){
            return errorResponse(400, err.message);
        }
        response.setBody(result);
    });

    if (!docDeleted) {
      return errorResponse(400, "The document could not be deleted.");
    }
  };

  function errorResponse(code,message){
    var errorObj = {};
    errorObj.code = code;
    errorObj.message = message;
    errorObj.date = getDateTime();
    return response.setBody(errorObj);
  }

  function getDateTime(){
    var currentdate = new Date();
    var dateTime = currentdate.getFullYear() + "-" +(currentdate.getMonth()+1)+ "-" +     currentdate.getDate()+ " "  +currentdate.getHours()+":"+currentdate.getMinutes()+":"+currentdate.getSeconds();
      return dateTime;
    }
}

与此同时，还需要启用分区以执行(<，>，< =，> =，！=)

With that you also need to enable partitions to execute (<,>,<=,>=,!=)

所以尝试:

也在 custom 内也有以下JSON

also inside custom have following JSON

{
  "indexingMode": "consistent",
  "automatic": true,
  "includedPaths": [
    {
      "path": "/*",
      "indexes": [
        {
          "kind": "Range",
          "dataType": "String",
          "precision": -1
        },
        {
          "kind": "Range",
          "dataType": "Number",
          "precision": -1
        },
        {
          "kind": "Spatial",
          "dataType": "Point"
        },
        {
          "kind": "Spatial",
          "dataType": "Polygon"
        }
      ]
    }
  ],
  "excludedPaths": []
}

谢谢

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