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// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
syntax = "proto3";
package google.datastore.v1;
import "google/api/annotations.proto";
import "google/datastore/v1/entity.proto";
import "google/protobuf/wrappers.proto";
import "google/type/latlng.proto";
option csharp_namespace = "Google.Cloud.Datastore.V1";
option go_package = "google.golang.org/genproto/googleapis/datastore/v1;datastore";
option java_multiple_files = true;
option java_outer_classname = "QueryProto";
option java_package = "com.google.datastore.v1";
// The result of fetching an entity from Datastore.
message EntityResult {
// Specifies what data the 'entity' field contains.
// A `ResultType` is either implied (for example, in `LookupResponse.missing`
// from `datastore.proto`, it is always `KEY_ONLY`) or specified by context
// (for example, in message `QueryResultBatch`, field `entity_result_type`
// specifies a `ResultType` for all the values in field `entity_results`).
enum ResultType {
// Unspecified. This value is never used.
RESULT_TYPE_UNSPECIFIED = 0;
// The key and properties.
FULL = 1;
// A projected subset of properties. The entity may have no key.
PROJECTION = 2;
// Only the key.
KEY_ONLY = 3;
}
// The resulting entity.
Entity entity = 1;
// The version of the entity, a strictly positive number that monotonically
// increases with changes to the entity.
//
// This field is set for [`FULL`][google.datastore.v1.EntityResult.ResultType.FULL] entity
// results.
//
// For [missing][google.datastore.v1.LookupResponse.missing] entities in `LookupResponse`, this
// is the version of the snapshot that was used to look up the entity, and it
// is always set except for eventually consistent reads.
int64 version = 4;
// A cursor that points to the position after the result entity.
// Set only when the `EntityResult` is part of a `QueryResultBatch` message.
bytes cursor = 3;
}
// A query for entities.
message Query {
// The projection to return. Defaults to returning all properties.
repeated Projection projection = 2;
// The kinds to query (if empty, returns entities of all kinds).
// Currently at most 1 kind may be specified.
repeated KindExpression kind = 3;
// The filter to apply.
Filter filter = 4;
// The order to apply to the query results (if empty, order is unspecified).
repeated PropertyOrder order = 5;
// The properties to make distinct. The query results will contain the first
// result for each distinct combination of values for the given properties
// (if empty, all results are returned).
repeated PropertyReference distinct_on = 6;
// A starting point for the query results. Query cursors are
// returned in query result batches and
// [can only be used to continue the same query](https://cloud.google.com/datastore/docs/concepts/queries#cursors_limits_and_offsets).
bytes start_cursor = 7;
// An ending point for the query results. Query cursors are
// returned in query result batches and
// [can only be used to limit the same query](https://cloud.google.com/datastore/docs/concepts/queries#cursors_limits_and_offsets).
bytes end_cursor = 8;
// The number of results to skip. Applies before limit, but after all other
// constraints. Optional. Must be >= 0 if specified.
int32 offset = 10;
// The maximum number of results to return. Applies after all other
// constraints. Optional.
// Unspecified is interpreted as no limit.
// Must be >= 0 if specified.
google.protobuf.Int32Value limit = 12;
}
// A representation of a kind.
message KindExpression {
// The name of the kind.
string name = 1;
}
// A reference to a property relative to the kind expressions.
message PropertyReference {
// The name of the property.
// If name includes "."s, it may be interpreted as a property name path.
string name = 2;
}
// A representation of a property in a projection.
message Projection {
// The property to project.
PropertyReference property = 1;
}
// The desired order for a specific property.
message PropertyOrder {
// The sort direction.
enum Direction {
// Unspecified. This value must not be used.
DIRECTION_UNSPECIFIED = 0;
// Ascending.
ASCENDING = 1;
// Descending.
DESCENDING = 2;
}
// The property to order by.
PropertyReference property = 1;
// The direction to order by. Defaults to `ASCENDING`.
Direction direction = 2;
}
// A holder for any type of filter.
message Filter {
// The type of filter.
oneof filter_type {
// A composite filter.
CompositeFilter composite_filter = 1;
// A filter on a property.
PropertyFilter property_filter = 2;
}
}
// A filter that merges multiple other filters using the given operator.
message CompositeFilter {
// A composite filter operator.
enum Operator {
// Unspecified. This value must not be used.
OPERATOR_UNSPECIFIED = 0;
// The results are required to satisfy each of the combined filters.
AND = 1;
}
// The operator for combining multiple filters.
Operator op = 1;
// The list of filters to combine.
// Must contain at least one filter.
repeated Filter filters = 2;
}
// A filter on a specific property.
message PropertyFilter {
// A property filter operator.
enum Operator {
// Unspecified. This value must not be used.
OPERATOR_UNSPECIFIED = 0;
// Less than.
LESS_THAN = 1;
// Less than or equal.
LESS_THAN_OR_EQUAL = 2;
// Greater than.
GREATER_THAN = 3;
// Greater than or equal.
GREATER_THAN_OR_EQUAL = 4;
// Equal.
EQUAL = 5;
// Has ancestor.
HAS_ANCESTOR = 11;
}
// The property to filter by.
PropertyReference property = 1;
// The operator to filter by.
Operator op = 2;
// The value to compare the property to.
Value value = 3;
}
// A [GQL query](https://cloud.google.com/datastore/docs/apis/gql/gql_reference).
message GqlQuery {
// A string of the format described
// [here](https://cloud.google.com/datastore/docs/apis/gql/gql_reference).
string query_string = 1;
// When false, the query string must not contain any literals and instead must
// bind all values. For example,
// `SELECT * FROM Kind WHERE a = 'string literal'` is not allowed, while
// `SELECT * FROM Kind WHERE a = @value` is.
bool allow_literals = 2;
// For each non-reserved named binding site in the query string, there must be
// a named parameter with that name, but not necessarily the inverse.
//
// Key must match regex `[A-Za-z_$][A-Za-z_$0-9]*`, must not match regex
// `__.*__`, and must not be `""`.
map<string, GqlQueryParameter> named_bindings = 5;
// Numbered binding site @1 references the first numbered parameter,
// effectively using 1-based indexing, rather than the usual 0.
//
// For each binding site numbered i in `query_string`, there must be an i-th
// numbered parameter. The inverse must also be true.
repeated GqlQueryParameter positional_bindings = 4;
}
// A binding parameter for a GQL query.
message GqlQueryParameter {
// The type of parameter.
oneof parameter_type {
// A value parameter.
Value value = 2;
// A query cursor. Query cursors are returned in query
// result batches.
bytes cursor = 3;
}
}
// A batch of results produced by a query.
message QueryResultBatch {
// The possible values for the `more_results` field.
enum MoreResultsType {
// Unspecified. This value is never used.
MORE_RESULTS_TYPE_UNSPECIFIED = 0;
// There may be additional batches to fetch from this query.
NOT_FINISHED = 1;
// The query is finished, but there may be more results after the limit.
MORE_RESULTS_AFTER_LIMIT = 2;
// The query is finished, but there may be more results after the end
// cursor.
MORE_RESULTS_AFTER_CURSOR = 4;
// The query has been exhausted.
NO_MORE_RESULTS = 3;
}
// The number of results skipped, typically because of an offset.
int32 skipped_results = 6;
// A cursor that points to the position after the last skipped result.
// Will be set when `skipped_results` != 0.
bytes skipped_cursor = 3;
// The result type for every entity in `entity_results`.
EntityResult.ResultType entity_result_type = 1;
// The results for this batch.
repeated EntityResult entity_results = 2;
// A cursor that points to the position after the last result in the batch.
bytes end_cursor = 4;
// The state of the query after the current batch.
MoreResultsType more_results = 5;
// The version number of the snapshot this batch was returned from.
// This applies to the range of results from the query's `start_cursor` (or
// the beginning of the query if no cursor was given) to this batch's
// `end_cursor` (not the query's `end_cursor`).
//
// In a single transaction, subsequent query result batches for the same query
// can have a greater snapshot version number. Each batch's snapshot version
// is valid for all preceding batches.
// The value will be zero for eventually consistent queries.
int64 snapshot_version = 7;
}