In some situations query execution must be delayed. To cover such scenario lazily and many others query extensions has been introduced.
Lazily
public Lazy<List<T>> lazily();
public Lazy<List<T>> lazily(Action1<List<T>> onEval);
| Parameters |
|
|
| onEval |
Action1<List<T>> |
Action that will be performed on query results. |
| Return Value |
|
| Lazy<List<TResult>> |
Lazy query initializer returning query results. |
Example
QEmployee e = QEmployee.employee;
Lazy<List<Employee>> employeesLazy = session
.query(Employee.class)
.where(e.firstName.eq("Robert"))
.lazily();
List<Employee> employees = employeesLazy.getValue(); // query will be executed here
CountLazily
public Lazy<Integer> countLazily();
| Return Value |
|
| Lazy<List<TResult>> |
Lazy query initializer returning count of matched documents. |
Example
QEmployee e = QEmployee.employee;
Lazy<Integer> countLazy = session
.query(Employee.class)
.where(e.firstName.eq("Robert"))
.countLazily();
Integer count = countLazy.getValue(); // query will be executed here
SuggestLazy
public Lazy<SuggestionQueryResult> suggestLazy();
public Lazy<SuggestionQueryResult> suggestLazy(SuggestionQuery query);
| Parameters |
|
|
| query |
SuggestionQuery |
A suggestion query definition containing all information required to query a specified index. |
| Return Value |
|
| Lazy<SuggestionQueryResult> |
Lazy query initializer containing array of all suggestions for executed query. |
Example
Lazy<SuggestionQueryResult> suggestLazy = session
.query(Employee.class)
.suggestLazy();
SuggestionQueryResult suggest = suggestLazy.getValue(); // query will be executed here
String[] suggestions = suggest.getSuggestions();
ToFacetsLazy
public Lazy<FacetResults> toFacetsLazy(List<Facet> facets);
public Lazy<FacetResults> toFacetsLazy(List<Facet> facets, int start);
public Lazy<FacetResults> toFacetsLazy(List<Facet> facets, int start, Integer pageSize);
public Lazy<FacetResults> toFacetsLazy(String facetSetupDoc);
public Lazy<FacetResults> toFacetsLazy(String facetSetupDoc, int start);
public Lazy<FacetResults> toFacetsLazy(String facetSetupDoc, int start, Integer pageSize);
| Parameters |
|
|
| facets |
List<Facet> |
List of facets required to perform a facet query (mutually exclusive with facetSetupDoc). |
| facetSetupDoc |
String |
Document key that contains predefined FacetSetup (mutually exclusive with facets). |
| start |
int |
number of results that should be skipped. Default: 0. |
| pageSize |
int |
maximum number of results that will be retrieved. Default: null. |
| Return Value |
|
| Lazy<FacetResults> |
Lazy query initializer containing Facet query results with query Duration and list of Results - one entry for each term/range as specified in [FacetSetup] document or passed in parameters. |
Example
QEmployee e = QEmployee.employee;
Lazy<FacetResults> facetsLazy = session
.query(Camera.class, "Camera/Costs")
.toFacetsLazy("facets/CameraFacets");
FacetResults facets = facetsLazy.getValue(); // query will be executed here
Map<String, FacetResult> results = facets.getResults();
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