java - Querying Mapped Superclasses or Equivalent -

-

i have 3 classes subclasses of abstract superclass automobile. i'm using single table inheritance model , @mappedsuperclass automobile class. subclasses car, truck, , van.

i want query automobile class, have different subclasses returned. i've written couple queries , done research, seems not possible query against mappedsuperclasses. have tried nativesqlqueries, can't seem able figure out how specifiy multiple resultsetmappings.

is there anyway accomplish this?

you cannot use mapped-superclass in query. if want use automobile in query, don't mark mapped-superclass, instead mark entity.

following jpa 2.0 spec, second paragraph what's relevant in case -

2.11.2 mapped superclasses

an entity may inherit superclass provides persistent entity state , mapping information, not entity. typically, purpose of such mapped superclass define state , mapping information common multiple entity classes.

a mapped superclass, unlike entity, not queryable , must not passed argument entitymanager or query operations. persistent relationships defined mapped superclass must unidirectional.


Comments

Post a Comment

Popular posts from this blog

c++ - How to add Crypto++ library to Qt project -

-
Image
i downloaded crypto++ source , compiled cryptlib project in visual studio 2013, , added generated .lib file qt project, made .pro file this: qt += core gui qt += sql greaterthan(qt_major_version, 4):qt += widgets target = untitled template = app sources += main.cpp\ mainwindow.cpp headers += mainwindow.h \ databasecontrol.h \ test.h forms += mainwindow.ui win32:config(release, debug|release): libs += -l$$pwd/ -lcryptlib else:win32:config(debug, debug|release): libs += -l$$pwd/ -lcryptlibd else:unix: libs += -l$$pwd/ -lcryptlib includepath += $$pwd/ dependpath += $$pwd/ win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/libcryptlib.a else:win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/libcryptlibd.a else:win32:!win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/cryptlib.lib else:win32:!win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/cryptlibd.lib else:unix: pre_targetdeps += $$pw
Read more

jQuery Mobile app not scrolling in Firefox -

-
i have mobile app built in jquery mobile. scrolling fine in chrome & safari, fails scroll in firefox on desktop. have other instances of same app, different features, , works across browsers. life of me, cannot figure this, please help! located here: http://re-brand.us/dsus/index.html seems bug in firefox: bug log . able scroll using keyboard not trackpad on mac. are using mac? i'll keep looking see if can find way around it.
Read more

How to use vim as editor in Matlab GUI -

-
i using matlab r2013b. using gui, command windows , editor in split screen. in matlab preferences > editor/debugger > editor. there option set custom editor instead of matlab editor. set local editor /usr/bin/vim , not able open files @ anymore. there possibility use vim editor in split screen mode? i aware of !vim file.m , not solution looking for, works satisfactory in -nodisplay mode. rather want keep split screen mode. i did not find solution 100% satisfying, using tmux intermediate solution. allows 2 use split screen 2 terminals. in 1 of can open matlab -nodesktop in terminal mode, , in other 1 vim . possible switch between both split screens. you can use functionality of gui matlab typing things commandhistory , who et cetera.
Read more