BaseService (QDDT API)

All Known Subinterfaces:

AgencyService, AuthorityService, AuthorService, BaseArchivedService<T>, CategoryService, ChangeFeedService, CommentService, ConceptService, ControlConstructService, InstructionService, InstrumentService, PublicationService, PublicationStatusService, QuestionItemService, ResponseDomainService, StudyService, SurveyProgramService, TopicGroupService, UniverseService, UserService

All Known Implementing Classes:

AuthorServiceImpl, ChangeFeedServiceImpl, PublicationServiceImpl, PublicationStatusServiceImpl
```
public interface BaseService<T,ID>
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`count()`
`void`	`delete(ID id)`	Deletes object with id ID from backstore, exception raised by failure.
`void`	`delete(java.util.List<T> instances)`	Deletes object with these IDs from backstore, exception raised by failure.
`boolean`	`exists(ID id)`
`<S extends T> S`	`findOne(ID id)`	Return a entity based on its ID.
`<S extends T> S`	`save(S instance)`	Store object T to backstore

- Method Detail
  - count
```
long count()
```
    Returns:
    
    number of entities
  - exists
```
boolean exists(ID id)
```
    Parameters:
    
    id - ID of entity
    
    Returns:
    
    true if exists
  - findOne
```
<S extends T> S findOne(ID id)
```
    Return a entity based on its ID.
    
    Parameters:
    
    id - ID of entity
    
    Returns:
    
    Entity
  - save
```
<S extends T> S save(S instance)
```
    Store object T to backstore
    
    Parameters:
    
    instance - object T
    
    Returns:
    
    saved instance T (may have fields updated by backstore)
  - delete
```
void delete(ID id)
     throws org.springframework.dao.DataAccessException
```
    Deletes object with id ID from backstore, exception raised by failure.
    
    Parameters:
    
    id - ID of entity
    
    Throws:
    
    org.springframework.dao.DataAccessException
  - delete
```
void delete(java.util.List<T> instances)
     throws org.springframework.dao.DataAccessException
```
    Deletes object with these IDs from backstore, exception raised by failure.
    
    Parameters:
    
    instances - list of entity IDs
    
    Throws:
    
    org.springframework.dao.DataAccessException