de.minee.jpa

Class AbstractJoinClause<S,T>

java.lang.Object

de.minee.jpa.AbstractQuery

de.minee.jpa.AbstractStatement<S>

de.minee.jpa.AbstractJoinClause<S,T>

Type Parameters:

S - The class that should be joined

T - The base class of the From clause

Direct Known Subclasses:

BackwardJoinClause, ForwardJoinClause

public abstract class AbstractJoinClause<S,T>
extends AbstractStatement<S>

Joins the class S to T for additional where conditions.

Method Summary

Modifier and Type	Method and Description
protected String	assembleQuery() Assembles the restriction part of the the query.
protected S	byId(UUID id, Map<Object,Object> handledObjects) Selects an Object directly by its Id or returns a cached Object of the current session.
<U extends AbstractStatement<T>> InitialQueryConnection<T,U>	end()
List<S>	execute()
List<S>	execute(Collection<?> args)
protected <U extends AbstractStatement<T>> InitialQueryConnection<T,U>	getQueryConnection()

Methods inherited from class de.minee.jpa.AbstractStatement

add, add, and, assembleFullSelectQuery, byId, getType, or, query, toString

Methods inherited from class de.minee.jpa.AbstractQuery

executeQuery, executeQuery, getConnection

Methods inherited from class java.lang.Object

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

Method Detail

getQueryConnection

protected <U extends AbstractStatement<T>> InitialQueryConnection<T,U> getQueryConnection()

end

public <U extends AbstractStatement<T>> InitialQueryConnection<T,U> end()

assembleQuery

protected String assembleQuery()

Description copied from class: AbstractStatement

Assembles the restriction part of the the query. This can be for example the part of where excluding the 'WHERE' keyword

Overrides:

assembleQuery in class AbstractStatement<S>

Returns:

The 'WHERE' part of the statement

execute

public List<S> execute()

Specified by:

execute in class AbstractStatement<S>

execute

public List<S> execute(Collection<?> args)

Specified by:

execute in class AbstractStatement<S>

byId

protected S byId(UUID id,
                 Map<Object,Object> handledObjects)

Description copied from class: AbstractStatement

Selects an Object directly by its Id or returns a cached Object of the current session. The cache improves performance, ensures object references and avoids endless cycles.

Specified by:

byId in class AbstractStatement<S>

Parameters:

id - Id of the entry

handledObjects - Object cache of fetched entries in the same session

Returns:

Object with Id id or null if no entry can be found @ SQLException in case of an error