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A thin wrapper around datastore query RPC calls.
This provides wrappers around the internal only datastore_pb library and is designed to be the lowest-level API to be used by all Python datastore client libraries for executing queries. It provides a layer of protection so the actual RPC syntax can change without affecting client libraries.
Any class, function, field or argument starting with an '_' is for INTERNAL use only and should not be used by developers!
Classes
class Batch: A batch of results returned by a query.
class Batcher: A class that implements the Iterator interface for Batches.
class CompositeFilter: An immutable filter predicate that combines other predicates.
class CompositeOrder: An immutable class that represents a sequence of Orders.
class CorrelationFilter: A filter that isolates correlated values and applies a sub-filter on them.
class Cursor: An immutable class that represents a relative position in a query.
class FetchOptions: An immutable class that contains all options for fetching results.
class FilterPredicate: An abstract base class for all query filters.
class Order: A base class that represents a sort order on a query.
class PropertyFilter: An immutable filter predicate that constrains a single property.
class PropertyOrder: An immutable class that represents a sort order for a single property.
class Query: An immutable class that represents a query signature.
class QueryOptions: An immutable class that contains all options for running a query.
class ResultsIterator: An iterator over the results from Batches obtained from a Batcher.
Functions
apply_query(...): Performs the given query on a set of in-memory results.
inject_results(...): Creates a query object that will inject changes into results.
make_filter(...): Constructs a FilterPredicate from the given name, op and values.