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Session: Querying: How to stream query results?

Query results can be streamed using stream method from advanced() session operations.

Syntax

public <T> CloseableIterator<StreamResult<T>> stream(IRavenQueryable<T> query);

public <T> CloseableIterator<StreamResult<T>> stream(IRavenQueryable<T> query, Reference<QueryHeaderInformation> queryHeaderInformation);

public <T> CloseableIterator<StreamResult<T>> stream(IDocumentQuery<T> query);

public <T> CloseableIterator<StreamResult<T>> stream(IDocumentQuery<T> query, Reference<QueryHeaderInformation> queryHeaderInformation);

Parameters
query IQueryable or IDocumentQuery Query to stream results for.
queryHeaderInformation QueryHeaderInformation Information about performed query.
Return Value
CloseableIterator<StreamResult<T>> Iterator with entities.
QueryHeaderInformation Information about performed query.

Example I

QEmployee e = QEmployee.employee;
IRavenQueryable<Employee> query = session
  .query(Employee.class)
  .where(e.firstName.eq("Robert"));

try (CloseableIterator<StreamResult<Employee>> results = session.advanced().stream(query)) {
  while (results.hasNext()) {
    StreamResult<Employee> employee = results.next();
  }
}

Example II

QEmployee e = QEmployee.employee;
IDocumentQuery<Employee> query = session
  .advanced()
  .documentQuery(Employee.class)
  .whereEquals(e.firstName, "Robert");

Reference<QueryHeaderInformation> queryHeaderInfoRef = new Reference<>();
try (CloseableIterator<StreamResult<Employee>> results = session.advanced().stream(query, queryHeaderInfoRef)) {
  while (results.hasNext()) {
    StreamResult<Employee> employee = results.next();
  }
}