通过门户从Azure Cosmos DB中删除所有/多个文档 [英] Delete all/multiple documents from Azure Cosmos DB through the portal
本文介绍了通过门户从Azure Cosmos DB中删除所有/多个文档的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否可以通过Azure门户、Azure COSMOS SQL查询或POWER shell脚本删除集合中的所有/多个文档?
推荐答案
根据我的经验,删除所有文档的最快方法是将容器上的"生存时间"设置为1秒。这将删除所有文档。但请注意,此过程需要一些时间,因此如果您过早地将"生存时间"设置回"无限制",则尚未删除的文档将重新出现。
您可以在容器的"刻度和设置"下设置"生存时间":url->https://docs.microsoft.com/en-us/azure/cosmos-db/how-to-time-to-live
您还可以在容器中创建一个存储过程并运行该存储过程。.url->https://github.com/Azure/azure-cosmosdb-js-server/blob/master/samples/stored-procedures/bulkDelete.js
存储过程:
/**
* A Cosmos DB stored procedure that bulk deletes documents for a given query.<br/>
* Note: You may need to execute this stored procedure multiple times (depending whether the stored procedure 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 c._self FROM c WHERE c.founded_year = 2008"). Note: For best performance, reduce the # of properties returned per document in the query to only what's required (e.g. prefer SELECT c._self over SELECT * )
* @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 stored procedure again (true if there are more documents to delete; false otherwise).
*/
function bulkDeleteStoredProcedure(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();
}
}
}
然后您可以编写powershellscript来运行该存储过程。
更新
我相信设置"生存时间"的另一个好处是它不会消耗任何RU,但是使用存储过程删除就可以了。
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