SingleQueryable (Java2DB 5.1.1 API)

All Known Subinterfaces:

AsyncQueryable<T>, AsyncSingleQueryable<T>, Queryable<T>

All Known Implementing Classes:

AsyncEntityProjectionQuery, AsyncEntityQuery, AsyncSingleEntityProjectionQuery, AsyncSingleEntityQuery, EntityProjectionQuery, EntityQuery, SingleEntityProjectionQuery, SingleEntityQuery
```
public interface SingleQueryable<T>
```
Author:

Collin Alpert

Method Summary

Modifier and Type	Method	Description
`Optional<T>`	`first()`	Gets the first value from the database result.
`String`	`getQuery()`	Responsible for building and returning the individual DQL statement.

- Method Detail
  - first
```
Optional<T> first()
```
    Gets the first value from the database result. This method should be used when only one result is expected.
    
    Returns:
    
    The first row as an entity wrapped in an Optional if there is at least one row. Otherwise Optional.empty() is returned. If the value from the database is null, an empty Optional is also returned.
  - getQuery
```
String getQuery()
```
    Responsible for building and returning the individual DQL statement.
    
    Returns:
    
    The DQL statement which fetches data from the database.