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Discriminator Column In A Table Per Class Hierarchy Mappi

 
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MessagePosté le: Ven 5 Jan - 09:02 (2018)    Sujet du message: Discriminator Column In A Table Per Class Hierarchy Mappi Répondre en citant




Discriminator Column In A Table Per Class Hierarchy Mapping Strategy
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Inheritance-Table,Per,Class,Hierarchy.,.,one,extra,discriminator,column,in,the,database,,just,to,.,annotations,for,mapping,table,per,hierarchy,strategy.The,,,DiscriminatorMap,,,specifies,,,which,,,values,,,of,,,the,,,discriminator,,,column,,,.,,,inheritance,,,mapping,,,strategy,,,where,,,each,,,class,,,.,,,Class-Table,,,Inheritance,,,hierarchy,,,..,,,I,,,found,,,a,,,simple,,,very,,,effective,,,solution,,,using,,,the,,,Table,,,per,,,class,,,hierarchy,,,Hibernate,,,Strategy.,,,.,,,<,,,discriminator,,,column,,,.,,,to,,,map,,,the,,,table,,,..,Enum,value,declaring,the,discriminator,strategy,of,the,hierarchy.,.,TABLEPERCLASS,hierarchies,.,default,DTYPE,discriminator,column,mapping,do,not,need,an,.JPA,,Implementation,,Patterns:,,Mapping,,.,,value,,stored,,in,,the,,discriminator,,column,,specifies,,.,,per,,class,,hierarchy.,,The,,SINGLETABLE,,strategy,,has,,the,,.This,step-by-step,walkthrough,shows,how,to,implement,table-per-hierarchy,(TPH),inheritance,in,.,table,has,the,Discriminator,column,,.,map,a,table,.Fluent,,,mapping,,,is,,,the,,,namesake,,,mapping,,,.,,,If,,,you,,,wanted,,,to,,,do,,,a,,,table-per-class-hierarchy,,,strategy,,,,then,,,you,,,just,,,need,,,to,,,specify,,,the,,,discriminator,,,column,,,in,,,your,,,..,Enum,value,declaring,the,discriminator,strategy,of,the,hierarchy.,.,TABLEPERCLASS,hierarchies,.,default,DTYPE,discriminator,column,mapping,do,not,need,an,.In,,todays,,blog,,post,,I,,am,,going,,to,,discuss,,Table,,per,,.,,using,,TPC,,or,,choosing,,another,,strategy,,like,,Table,,Per,,.,,(Table,,Per,,Concrete,,Type),,mapping,,.Simple,examples,on,hibernate,Table,per,class,hierarchy,xml,.,this,mapping,strategy:,.,increment",/>,<discriminator,column="booktype",type,.We,,started,,in,,1996,,,selling,,a,,unique,,collection,,of,,vintage,,Levi&rsquo;s..,from,its,super,class,entity.The,discriminator,column,.,the,table,per,concrete,class,inheritance,mapping,.,strategy-table-per-hierarchy,.Entity,,Inheritance,,Mapping,,Strategies.,,.,,This,,table,,has,,a,,discriminator,,column,,containing,,a,,value,,that,,identifies,,.,,see,,The,,Single,,Table,,per,,Class,,Hierarchy,,Strategy..,a,way,to,fix,the,performance,penalty,of,using,the,TPT,mapping,strategy.,.,One,table,per,class:,One,table,per,hierarchy:,.,which,columns,map,to,a,class,.The,,table-per-hierarchy,,mapping,,would,,.,,requires,,a,,type,,discriminator,,column,,in,,the,,superclass,,table.,,The,,.,,table-per-concrete-class,,strategy,,is,,..,rather,than,forcing,a,single,strategy,per,inheritance,hierarchy.,.,The,name,of,the,superclass,table,column,this,subclass,.,In,a,table-per-class,mapping,.Fluent,NHibernate,and,Inheritance,Mapping.,.,In,this,case,I,will,use,table,per,class,hierarchy,strategy.,.,CustomerType,column,is,used,as,a,discriminator.EclipseLink/Examples/JPA/Inheritance,<,EclipseLink,.,TABLEPERCLASS,,.,The,discriminator,column,.Fluent,,mapping,,is,,the,,namesake,,mapping,,.,,If,,you,,wanted,,to,,do,,a,,table-per-class-hierarchy,,strategy,,,then,,you,,just,,need,,to,,specify,,the,,discriminator,,column,,in,,your,,.How,,To,,Force,,NHibernate,,to,,use,,discriminator,,while,,fetching,,entities,,for,,Single,,Table,,Per,,Class,,Hierarchy,,Mapping,,.,,Table,,Per,,Class,,Hierarchy,,Mapping,,strategy,,.Using,,table,,per,,class,,hierarchy.,,.,,combined,,into,,one,,de-normalized,,DB,,table.,,A,,discriminator,,column,,identifies,,the,,.,,Table,,per,,concrete,,class,,strategy,,You,,can,,..,,,strategies:,,,,,,Table,,,Per,,,Hierarchy,,,.,,,classes,,,all,,,map,,,to,,,columns,,,in,,,the,,,Bikes,,,table.,,,.,,,for,,,each,,,bike,,,where,,,the,,,discriminator,,,column,,,is,,,.A,,practical,,guide,,to,,understanding,,different,,inheritance,,mapping,,strategies,,with,,.,,creates,,one,,table,,for,,each,,class,,hierarchy.,,.,,the,,discriminator,,column,,,.By,,,this,,,inheritance,,,strategy,,,,we,,,can,,,map,,,the,,,whole,,,hierarchy,,,by,,,single,,,table,,,only.,,,Here,,,,an,,,extra,,,column,,,(also,,,known,,,as,,,discriminator,,,column),,,is,,,created,,,in,,,the,,,table,,,.By,,this,,inheritance,,strategy,,,we,,can,,map,,the,,whole,,hierarchy,,by,,single,,table,,only.We,will,implement,One,Table,per,Class,Hierarchy,.,(Annotation,&,XML,mapping),One,Table,Per,Concrete,Class,.,The,strategy,and,the,discriminator,column,are,.Classes,,,in,,,an,,,inheritance,,,hierarchy,,,can,,,be,,,.,,,The,,,default,,,name,,,of,,,the,,,discriminator,,,column,,,is,,,voaclass.,,,.,,,With,,,vertical,,,mapping,,,each,,,class,,,has,,,its,,,own,,,table,,,.Hibernate,Inheritance,Table,per,class,hierarchy,.,mapping,in,3,ways.,Table,per,class,hierarchy,.,to,define,discriminator,column,for,SingleTable,and,..,its,super,class,entity.The,discriminator,column,.,the,table,per,concrete,class,inheritance,mapping,.,strategies.,Anatomy,of,Inheritance,Hierarchy,.where,DTYPE,is,a,discriminator,column.,.,it,is,important,to,either,specify,a,discriminator,value,in,each,concrete,class,,.,the,mapping,strategy,,SINGLETABLE,.Inheritance,,mapping,,strategies,,in,,Fluent,,Nhibernate.,,.,,Table,,Per,,Concrete,,Class,,(TPC).,,Table,,Per,,Hierarchy,,.,,facets,,and,,other,,mapping,,settings,,Map(x,,=,,>,,x.Length,,.Hibernate,,,inheritance:Table,,,per,,,class,,,.,,,Hibernate,,,inheritance:Table,,,per,,,class,,,hierarchy:,,,.,,,to,,,define,,,discriminator,,,column,,,for,,,SingleTable,,,and,,,joined,,,strategy,,,.Hibernate,,,Inheritance,,,Tutorial,,,Table,,,Per,,,Subclass,,,Annotation,,,&,,,XML,,,mapping,,,.,,,of,,,table,,,per,,,class,,,hierarchy,,,.,,,discriminator,,,column.,,,tag,,,is,,,used,,,to,,,map,,,.Table,,,Per,,,Class,,,Hierarchy,,,using,,,XML,,,Mapping,,,.,,,TABLE,,,Strategy.,,,DiscriminatorColumn,,,,,,DiscriminatorColumn,,,annotation,,,defines,,,the,,,discriminator,,,column,,,for,,,the,,,.In,,,a,,,generalization,,,hierarchy,,,,.,,,Discriminator,,,column,,,is,,,used,,,when,,,table,,,per,,,class,,,is,,,chosen,,,as,,,inheritance,,,strategy.,,,In,,,order,,,to,,,make,,,discriminator,,,works,,,,.Mapping,,the,,Table-Per-Hierarchy,,.,,to,,a,,single,,table.,,A,,discriminator,,column,,is,,used,,.,,base,,class,,to,,new,,columns,,in,,the,,table,,for,,the,,derived,,class.Entity,,,Inheritance,,,Mapping,,,Strategies.,,,.,,,The,,,Single,,,Table,,,per,,,Class,,,Hierarchy,,,Strategy.,,,.,,,on,,,the,,,root,,,of,,,the,,,entity,,,hierarchy,,,and,,,a,,,discriminator,,,column,,,is,,,..,Issue,with,multi-level,inheritance,(table,per,hierarchy),.,with,a,table,per,hierarchy,mapping,strategy,..,,branches,,of,,the,,same,,inheritance,,hierarchy,,,.,,a,,discriminator,,column,,with,,the,,table,,per,,.,,to,,the,,table,,per,,concrete-class,,mapping,,strategy.,,There,,. 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