com.github.collinalpert.java2db.queries.SingleEntityProjectionQuery<E,R>

Direct Known Subclasses:: AsyncSingleEntityProjectionQuery, EntityProjectionQuery

public class SingleEntityProjectionQuery<E extends BaseEntity,R>
extends Object
implements SingleQueryable<R>

Method Summary

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

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- returnType
  
  protected final Class<R> returnType
- originalQuery
  
  protected final SingleEntityQuery<E extends BaseEntity> originalQuery
Constructor Details
- SingleEntityProjectionQuery
  
  public SingleEntityProjectionQuery(com.github.collinalpert.lambda2sql.functions.SqlFunction<E,R> projection, SingleEntityQuery<E> originalQuery)
Method Details
- first
  
  public Optional<R> first()
  
  Description copied from interface: SingleQueryable
  
  Gets the first value from the database result. This method should be used when only one result is expected.
  
  Specified by:
  
  first in interface SingleQueryable<E extends BaseEntity>
  
  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
  
  public String getQuery()
  
  Description copied from interface: SingleQueryable
  
  Responsible for building and returning the individual DQL statement.
  
  Specified by:
  
  getQuery in interface SingleQueryable<E extends BaseEntity>
  
  Returns:
  
  The DQL statement which fetches data from the database.

Modifier and Type	Field	Description
`protected SingleEntityQuery<E>`	`originalQuery`
`protected Class<R>`	`returnType`

Class SingleEntityProjectionQuery<E extends BaseEntity,​R>