I'm using a new database from Microsoft called DocumentDB. Now I want to delete a document by ID, but I cannot figure out, how to do this. Delete operation in DocumentDB requires self-links and they are different from my own ids. However I am querying once for document, then I will get the self link. With that self link I am deleting the document.
Now I want to delete all documents around 50000+ documents in my collection.
Need to get each document and then delete or any simple method to do the same?
Can it be possible?
You're correct that deleting documents require a reference to the document's _self
link.
If you are looking to delete ALL documents in your collection - it may be simpler and faster to delete and re-create the collection. The only caveat is that server-side scripts (e.g. sprocs, udfs, triggers) also belong to the collection and may need to be re-created as well.
Update: I wrote a quick stored procedure that performs a bulk-delete given a query. This allows you to perform bulk delete operations in fewer network requests.
/**
* 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();
}
}
}
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