Question

如果多个列相似（posts_by和location），我有一个文档，我想转向is_approved = false。

我无法编写可以获得多个重复列的查询。

function Prop() {
    var collection = getContext().getCollection();
    var collectionLink = collection.getSelfLink();
    var response = getContext().getResponse();
    var counter = 0;
    var responseBody = {
        updated: 0,
        continuation: true,
        error: "",
        log: ""
    };

    // Validate input.
    getFullListOfPosts();

    // Recursively queries for a document by id w/ support for continuation tokens.
    // Calls findDuplicates(document) as soon as the query returns a document.
    function getFullListOfPosts(continuation) {
        var query = {
            query: "select * from root r ORDER BY r.created.epoch DESC"
        };

        var requestOptions = {
            continuation: continuation
        };

        var isAccepted = collection.queryDocuments(collectionLink, query, requestOptions, proccessFullListOfPosts);

        // If we hit execution bounds - throw an exception.
        if (!isAccepted) {
            responseBody.log += "Query not accepted";
            response.setBody(responseBody);
        }
    }

    function proccessFullListOfPosts(err, documents, responseOptions) {
        if (err) {
            responseBody.error = err;
            throw err;
        }

        if (documents.length > 0) {
            // If documents are found, update them.
            responseBody.log += "Found documents: " + documents.length;
            findDuplicates(documents);
        }
    }
    // Updates the supplied document according to the update object passed in to the sproc.
    function findDuplicates(documents) {
        if (documents.length > 0) {
            responseBody.log += "Updating documents " + documents.length;
            //for (var i = 0; i < documents.length; i++) {
                var first = documents[0];
                //The below query is not right. I want the above query to fetch all records with same posted_by and location and turn its is_approved to false
                var query = 'select * from root r WHERE r.is_approved = true AND  r.posted_by =  "' + first.posted_by + '"'; 
                var requestOptions = {
                    etag: first._etag
                };
                var isAccepted = collection.queryDocuments(collectionLink, query, requestOptions, identifyRecordsToDisable);

                // Update the document.                     // If we hit execution bounds - throw an exception.
                if (!isAccepted) {
                    responseBody.log += "Update not accepted";
                    response.setBody(responseBody);
                } 
        } else {
            getFullListOfPosts();
        }
    }

    function identifyRecordsToDisable(err, documents, responseOptions) {
        if (err) {
            responseBody.error = err;
            throw err;
        }

        if (documents.length > 0) {
            // If documents are found, update them.

            responseBody.log += "Found documents: " + documents.length;
            for (var i = 0; i < documents.length; i++) { 
                var j = documents[i];
                j.is_approved = false;
                responseBody.log += "^Updated" + j.id + j.is_approved + ""
                var requestOptions = {
                    etag: j._etag
                };
                var isAccepted = collection.replaceDocument(j._self, j, requestOptions, onReplaced);

                responseBody.log += "*" + j.id + j.is_approved + "*"
            }
            findDuplicates(documents);
        }
    }

    function onReplaced(err, updatedDocument, responseOptions) {
        if (err) {
            responseBody.error = err;
            //throw err;
        }
        counter++;
        response.setBody("Updated " + counter + " documents");
    }
}

在上面的代码中，在函数'findDuplicates'中，我无法编写正确的查询，通过它我可以获得所有重复的记录。
我试过使用distinct，group by。有。我认为有记录不支持他们

Answer 1

以下查询可帮助您查找与两个属性值匹配的文档。

from django.db import IntegrityError
from rest_framework import status
from rest_framework.generics import ListCreateAPIView
from rest_framework.response import Response

class MyListCreateAPIView(ListCreateAPIView):
    def create(self, request, *args, **kwargs):
        try:
            return super(ListCreateAPIView, self).create(request, *args, **kwargs)
        except IntegrityError:
            content = {'error': 'IntegrityError'}
            return Response(content, status=status.HTTP_400_BAD_REQUEST)

DocumentDB：更新包含多列的列表的问题

1 个答案: