/**
* A DocumentDB stored procedure that bulk deletes documents for a given query.
* 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:
* deleted - contains a count of documents deleted
* 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();
}
}
}
db = client.CreateDatabaseQuery().Where(o => o.Id == "MyDocDb").ToList().First();
Sample Code For Deleting All Documents in a DocumentDB Instance with a Single Database and a Single Collection:
using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Util
{
class Program
{
private Uri _docDbUri = new Uri("https://<nameofyourdocdb>.documents.azure.com:443/");
private string _docDbKey = "<your primary key>";
private async Task DeleteDocsAsync()
{
using (var client = new DocumentClient(_docDbUri, _docDbKey))
{
try
{
var db = client.CreateDatabaseQuery().ToList().First();
var coll = client.CreateDocumentCollectionQuery(db.CollectionsLink).ToList().First();
var docs = client.CreateDocumentQuery(coll.DocumentsLink);
foreach (var doc in docs)
{
await client.DeleteDocumentAsync(doc.SelfLink);
}
}
catch (Exception ex)
{
Trace.WriteLine(ex);
throw;
}
}
}
static void Main(string[] args)
{
try
{
Program p = new Program();
p.DeleteDocsAsync().Wait();
}
catch (Exception)
{
throw;
}
}
}
}
2 回答
你're correct that deleting documents require a reference to the document' s
_self链接 .如果您要删除集合中的所有文档 - 删除和重新创建集合可能更简单，更快捷 . 唯一需要注意的是，服务器端脚本（例如sprocs，udfs，triggers）也属于集合，可能也需要重新创建 .
Update: 我编写了一个快速存储过程，在给定查询的情况下执行批量删除 . 这允许您在较少的网络请求中执行批量删除操作 .
这是使用C＃SDK删除文档的解决方案 . 下面的代码假定一个数据库和一个集合 . 它将迭代集合中的所有文档，并一次删除一个 . 要删除特定数据库，集合或文档，请修改相应的“CreateQuery”方法以包含SQL select语法 . 例如，要选择特定数据库，
db = client.CreateDatabaseQuery().Where(o => o.Id == "MyDocDb").ToList().First();Sample Code For Deleting All Documents in a DocumentDB Instance with a Single Database and a Single Collection: