c# - 如何通过c#代码删除DocumentDB中的所有文档

Question

我正在使用 Microsoft 的一个新数据库，称为 DocumentDB。现在我想按 ID 删除文档，但我不知道该怎么做。 DocumentDB 中的删除操作需要自链接，它们与我自己的 id 不同。但是我查询一次文档，然后我将获得 self 链接。通过该 self 链接，我将删除文档。

现在我想删除我收藏中大约 50000 多个文档的所有文档。

需要获取每个文档然后删除或任何简单的方法来做同样的事情？

这可能吗？

Answer 1

您是正确的，删除​​文档需要引用文档的 _self 链接。

如果您要删除集合中的 ALL 文档 - 删除并重新创建集合可能更简单、更快速。唯一需要注意的是，服务器端脚本(例如存储过程、udfs、触发器)也属于该集合，可能也需要重新创建。

更新:我编写了一个快速存储过程，用于执行给定查询的批量删除。这使您可以在更少的网络请求中执行批量删除操作。

/**
 * A DocumentDB stored procedure that bulk deletes documents for a given query.<br/>
 * Note: You may need to execute this sproc multiple times (depending whether the sproc is able to delete every document within the execution timeout limit).
 *
 * @function
 * @param {string} query - A query that provides the documents to be deleted (e.g. "SELECT * FROM c WHERE c.founded_year = 2008")
 * @returns {Object.<number, boolean>} Returns an object with the two properties:<br/>
 *   deleted - contains a count of documents deleted<br/>
 *   continuation - a boolean whether you should execute the sproc again (true if there are more documents to delete; false otherwise).
 */
function bulkDeleteSproc(query) {
    var collection = getContext().getCollection();
    var collectionLink = collection.getSelfLink();
    var response = getContext().getResponse();
    var responseBody = {
        deleted: 0,
        continuation: true
    };

    // Validate input.
    if (!query) throw new Error("The query is undefined or null.");

    tryQueryAndDelete();

    // Recursively runs the query w/ support for continuation tokens.
    // Calls tryDelete(documents) as soon as the query returns documents.
    function tryQueryAndDelete(continuation) {
        var requestOptions = {continuation: continuation};

        var isAccepted = collection.queryDocuments(collectionLink, query, requestOptions, function (err, retrievedDocs, responseOptions) {
            if (err) throw err;

            if (retrievedDocs.length > 0) {
                // Begin deleting documents as soon as documents are returned form the query results.
                // tryDelete() resumes querying after deleting; no need to page through continuation tokens.
                //  - this is to prioritize writes over reads given timeout constraints.
                tryDelete(retrievedDocs);
            } else if (responseOptions.continuation) {
                // Else if the query came back empty, but with a continuation token; repeat the query w/ the token.
                tryQueryAndDelete(responseOptions.continuation);
            } else {
                // Else if there are no more documents and no continuation token - we are finished deleting documents.
                responseBody.continuation = false;
                response.setBody(responseBody);
            }
        });

        // If we hit execution bounds - return continuation: true.
        if (!isAccepted) {
            response.setBody(responseBody);
        }
    }

    // Recursively deletes documents passed in as an array argument.
    // Attempts to query for more on empty array.
    function tryDelete(documents) {
        if (documents.length > 0) {
            // Delete the first document in the array.
            var isAccepted = collection.deleteDocument(documents[0]._self, {}, function (err, responseOptions) {
                if (err) throw err;

                responseBody.deleted++;
                documents.shift();
                // Delete the next document in the array.
                tryDelete(documents);
            });

            // If we hit execution bounds - return continuation: true.
            if (!isAccepted) {
                response.setBody(responseBody);
            }
        } else {
            // If the document array is empty, query for more documents.
            tryQueryAndDelete();
        }
    }
}