获取集合CosmosDb中的所有文档

Question

I would like to return all documents in a collection for CosmosDb

My code is as follows

 client.CreateDocumentQuery(UriFactory.CreateDocumentUri(dbName, colName,"id")).ToList();

It is not working. I can find a specific document but not all

Thanks

Answer 1

UriFactory.CreateDocumentUri creates a Uri for a document specific query.

What you want is all documents in a collection so what you need to create is to create a collection Uri. You can do that by using UriFactory.CreateDocumentCollectionUri(DatabaseName, CollectionName);

Just a note on your practice however. For operations that return a lot of documents you are recommended to use the .AsDocumentQuery() method and then do ExecuteNextAsync while query.HasMoreResults .

You should do it that way because the CosmosDB SDK does make trips over the wire synchronously if you just use .ToList() on the IQueryable and this will be bad for your application's performance.

Here is an example from MSDN on how you can do that.

using (var queryable = client.CreateDocumentQuery<Book>(
    collectionLink,
    new FeedOptions { MaxItemCount = 10 })
    .Where(b => b.Title == "War and Peace")
    .AsDocumentQuery())
{
    while (queryable.HasMoreResults) 
    {
        foreach(Book b in await queryable.ExecuteNextAsync<Book>())
        {
            // Iterate through books
        }
    }
}