public async Task LazyGqlQueryAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryLazilyAsync(GqlQuery,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
GqlQuery gqlQuery = new GqlQuery
{
QueryString = "SELECT * FROM book WHERE author = @author",
NamedBindings = { { "author", new GqlQueryParameter {
Value = "Jane Austen"
} } },
};
AsyncLazyDatastoreQuery results = db.RunQueryLazilyAsync(gqlQuery);
// AsyncLazyDatastoreQuery implements IAsyncEnumerable<Entity>, but you can
// call AsResponses() to see the raw RPC responses, or
// GetAllResultsAsync() to get all the results into memory, complete with
// the end cursor and the reason for the query finishing.
await results.ForEachAsync(entity =>
{
Console.WriteLine(entity);
});
// End snippet
// This will run the query again, admittedly...
List <Entity> entities = await results.ToList();
Assert.Equal(1, entities.Count);
Entity book = entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public async Task LazyStructuredQueryAsync()
{
string projectId = _fixture.ProjectId;
string namespaceId = _fixture.NamespaceId;
// Snippet: RunQueryLazilyAsync(Query,*,*)
DatastoreDb db = DatastoreDb.Create(projectId, namespaceId);
Query query = new Query("book")
{
Filter = Filter.Equal("author", "Jane Austen")
};
AsyncLazyDatastoreQuery results = db.RunQueryLazilyAsync(query);
// AsyncLazyDatastoreQuery implements IAsyncEnumerable<Entity>, but you can
// call AsResponses() to see the raw RPC responses, or
// GetAllResultsAsync() to get all the results into memory, complete with
// the end cursor and the reason for the query finishing.
await results.ForEachAsync(entity =>
{
Console.WriteLine(entity);
});
// End snippet
// This will run the query again, admittedly...
List <Entity> entities = await results.ToListAsync();
Assert.Equal(1, entities.Count);
Entity book = entities[0];
Assert.Equal("Jane Austen", (string)book["author"]);
Assert.Equal("Pride and Prejudice", (string)book["title"]);
}
public async Task GetAllResultsAsync()
{
var query = new AsyncLazyDatastoreQuery(_responses.Select(r => r.Clone()).ToAsyncEnumerable());
var results = await query.GetAllResultsAsync();
Assert.Equal(_entities, results.Entities.ToArray());
Assert.Equal(MoreResultsType.MoreResultsAfterLimit, results.MoreResults);
Assert.Equal(ByteString.CopyFromUtf8("after-batch-4"), results.EndCursor);
}
public async Task AsResponses()
{
var query = new AsyncLazyDatastoreQuery(_responses.Select(r => r.Clone()).ToAsyncEnumerable());
Assert.Equal(_responses, await query.AsResponses().ToListAsync());
}
