java - How to map weak entity hibernate -

-

i have following relation in database: image

i have 1 strong table.

i have 1 weak table has 1 one relation strong table. it's 0 1 relation, because strong table doesn't have 1 line in weak table. identify weak table enough id of strong table.

and have weak table, manytoone relation first weak entity. needs id of onetooneweakentity (that id of strong table), , own id. it's historical of onetooneweaktable.

i want map in hibernate, don't know how it.

now have following code:

@entity @table(name="table") public class table {      @id     @generatedvalue(strategy = generationtype.auto)     @column(name="id_table")     private integer idtable;     private string otheratributes;      .... }   @entity @table(name="onetooneweaktable") public class onetooneweakentity {         @onetoone(cascade = cascadetype.all, optional=false)      @id     @joincolumn(name="table_id_table")     private table table;     private string otheratributes;      .... }   @entity @table(name="onetomanyweaktable") @idclass(entitypk.class) public class onetomanyweaktable {      @id     @manytoone     @joincolumn(name="table_id_table")     private onetooneweakentity onetooneweakentity;     @id     @column(name="own_id")     private string ownid;     private string otheratributes;      .... }  class entitypk {      @id     @manytoone     @joincolumn(name="table_id_table")     private onetooneweakentity onetooneweakentity;     @id     @column(name="own_id")     private string ownid;     private string otheratributes;      ....

}

my problem when try run application, because have deployment error:

caused by: org.hibernate.annotationexception: foreign key refering package.onetooneweakentity package.onetomanyweaktable has wrong number of column. should 0 @ org.hibernate.cfg.annotations.tablebinder.bindfk(tablebinder.java:502) @ org.hibernate.cfg.toonefksecondpass.dosecondpass(toonefksecondpass.java:117) @ org.hibernate.cfg.configuration.processfksecondpassinorder(configuration.java:1518) @ org.hibernate.cfg.configuration.secondpasscompile(configuration.java:1422) @ org.hibernate.cfg.configuration.buildsessionfactory(configuration.java:1846) @ org.hibernate.cfg.configuration.buildsessionfactory(configuration.java:1930)

how can map relation??

thanks!

edit: try map onetooneweaktable:

@onetoone(cascade = cascadetype.all, optional=false)  @primarykeyjoincolumn @id @joincolumn(name="table_id_table") private table table;

in case, have error when try deploy, different exception:

caused by: java.lang.nullpointerexception @ org.hibernate.cfg.ejb3joincolumn.checkreferencedcolumnstype(ejb3joincolumn.java:568) @ org.hibernate.cfg.binderhelper.createsyntheticpropertyreference(binderhelper.java:258) @ org.hibernate.cfg.toonefksecondpass.dosecondpass(toonefksecondpass.java:116) @ org.hibernate.cfg.configuration.processfksecondpassinorder(configuration.java:1518) @ org.hibernate.cfg.configuration.secondpasscompile(configuration.java:1422) @ org.hibernate.cfg.configuration.buildsessionfactory(configuration.java:1846)

you don't have repeat annotations in entitypk class, need match simple primitive attribute represent compound key of onetomanyweaktable, should (note insertable , updatable attributes, has no sense modify association because part of entity instance's pk),

@entity @table(name="onetomanyweaktable") @idclass(entitypk.class) public class onetomanyweaktable {      @id     @column(name="table_id_table")     private long weakentity      @manytoone     @joincolumn(name="table_id_table", insertable=false, updatable=false)     private onetooneweakentity onetooneweakentity;      @id     @column(name="own_id")     private string ownid;      private string otheratributes;      .... }  class entitypk {      private long weakentity;      private string ownid;     .... }  @entity @table(name="onetooneweaktable") public class onetooneweakentity {         @onetoone     @id     @joincolumn(name="table_id_table")     private table table;      private string otheratributes;      .... }

also take @ official doc of compound primary keys

edit: add onetooneweaktable assuming using jpa 2, in edit mixing annotation. check id fileds , attribute share entities, must same type (note use long weakentity attribute example).


Comments

Post a Comment

Popular posts from this blog

yii2 - Yii 2 Running a Cron in the basic template -

-
i have seen instructions on running cron in advanced template, cant figure out how on basic template. have following controller in basic controllers folder. <?php namespace app\controllers; use yii\console\controller; /** * cron controller */ class croncontroller extends controller { public function actionindex() { echo "cron service runnning"; } public function actionmail($to) { echo "sending mail " . $to; } } i have navigated root of application , tried these comands yii cron php yii cron im getting unknown comand "cron" i know old question failed find actual answer this. if @ code yii exec file you'll notice requires /common/config/aliases.php file console/config/main.php. can naturally change these or copy on these advanced template. hope solves problem wanting same thing.
Read more

asp.net - 'System.Web.HttpContext' does not contain a definition for 'GetOwinContext' Mystery -

-
i realize question might seem trivial some, it's these types of things find myself fighting quite bit , want make sense of despite seeming losing battle in .net (for me anyway). so, if following: using system.web; ... applicationuser user = system.web.httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); that produces error in title , red getowincontext() , error cannot resolve symbol 'getowincontext()' however, if following (remove system.web in front of httpcontext ), works expected (or @ least no errors): using system.web; ... applicationuser user = httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); however, if (same line that's working using system.web commented out): //using system.web; ... applicationuser user = httpcontext.getowincontext().getusermana...
Read more

mercurial graft feature, can it copy? -

-
there new feature in mercurial 3, called 'graft' (graft local). job of moving change-set different branch. is there way "copy" change-set branch? i interested in in moving stuff qa branch production branch, still need code reside in qa. want copy. found , have tried few things, maybe it'll become clear more tinkering , reading... does have better way of 'cherry picking' change-sets move cross branch (or trunk)??? graft copies changesets, doesn't move them. hg graft (emphasis mine): this command uses mercurial's merge logic copy individual changes other branches without merging branches in history graph. known 'backporting' or 'cherry-picking' . default, graft copy user, date, , description source changesets.
Read more