Class AggregationQuery (2.31.4)
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publicclass AggregationQueryextendsQuery<AggregationResults>An implementation of a Google Cloud Datastore Query that returns AggregationResults, It can be constructed by providing a nested query (StructuredQuery or GqlQuery) to run the aggregations on and a set of Aggregation.
StructuredQuery example:
EntityQueryselectAllQuery=Query.newEntityQueryBuilder()
.setKind("Task")
.build();
AggregationQueryaggregationQuery=Query.newAggregationQueryBuilder()
.addAggregation(count().as("total_count"))
.over(selectAllQuery)
.build();
AggregationResultsaggregationResults=datastore.runAggregation(aggregationQuery);
for(AggregationResultaggregationResult:aggregationResults){
System.out.println(aggregationResult.get("total_count"));
}
GqlQuery example:
GqlQueryselectAllGqlQuery=Query.newGqlQueryBuilder(
"AGGREGATE COUNT(*) AS total_count, COUNT_UP_TO(100) AS count_upto_100 OVER(SELECT * FROM Task)"
)
.setAllowLiteral(true)
.build();
AggregationQueryaggregationQuery=Query.newAggregationQueryBuilder()
.over(selectAllGqlQuery)
.build();
AggregationResultsaggregationResults=datastore.runAggregation(aggregationQuery);
for(AggregationResultaggregationResult:aggregationResults){
System.out.println(aggregationResult.get("total_count"));
System.out.println(aggregationResult.get("count_upto_100"));
}
See Also: Datastore queries
Inherited Members
Methods
getAggregations()
publicSet<Aggregation>getAggregations()Returns the Aggregation(s) for this Query.
| Returns | |
|---|---|
| Type | Description |
Set<Aggregation> |
|
getMode()
publicAggregationQuery.ModegetMode()Returns the Mode for this query.
| Returns | |
|---|---|
| Type | Description |
AggregationQuery.Mode |
|
getNestedGqlQuery()
publicGqlQuery<?>getNestedGqlQuery()Returns the underlying for this Query. Returns null if created with StructuredQuery
| Returns | |
|---|---|
| Type | Description |
GqlQuery<?> |
|
getNestedStructuredQuery()
publicStructuredQuery<?>getNestedStructuredQuery()Returns the underlying for this Query. Returns null if created with GqlQuery
| Returns | |
|---|---|
| Type | Description |
StructuredQuery<?> |
|