hibernate-mapping

I have a class AbstractEntity that is extended by all the entities in my application and basically acts as an Identifier provider. @MappedSuperclass public class AbstractEntity implements DomainEntity { private static final long serialVersionUID = 1L; /** This object's id */ @Id @GeneratedValue(strategy = GenerationType.AUTO) protected long id; @Temporal(TemporalType.TIMESTAMP) @Column(name="creation_date", nullable = false, updatable=false) private Date creationDate = new Date(); /** * @return the id */ public long getId() { return this.id; } /** * @param id the id to set */ public void setId

I'm configuring Hibernate via the mapping configuration file. <class name="Person" table="person"> <id name="id" column="id" type="long"/> <property name="name" column="name" type="string"/> <property name="age" column="age" type="integer"/> </class> How do I set age to be nullable and default to null? <property name="age" type="integer"> <column name="age" not-null="false" default="null" /> </property> 来源： https://stackoverflow.com/questions/10610211/specify-default-value-in-hibernates-xml-configuration-file

I would like to intercept persistence operations over collection properties, decide by myself if it can be synchronized with database, and call a procedure when a persistence is decided to occur over all collection at once and not by each element. How to do that ? These collection properties are usually mapped with one-to-many or many-to-many associations. So, when we have something like this: myEntity.List.Add(new Item()); myEntity.List.Add(new Item()); ... session.Save(myEntity); For a mapping having two classes (entities) and an unidirectional many-to-many association, I would like to have

I use Hibernate 3.6 and I have something like this: @Entity public class Parent { @OnyToMany( fetch = FetchType.LAZY, cascade = { ascadeType.ALL } ) @Cascade( { org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.DELETE ) @JoinColumn( name="Parent_ID" ) public List<Child> getChildren() { return children; } public void setChildren( List<Child> children ) { this.children = children; } private transient List<TitleMetadataCategory> children; ... } @Entity public class Child { .... } Association is unidirectional for several reasons and I don't want to change it

I have declared the fallowing mapping with NHibernate3: with FluentNHibernate public class ActivityMap : ClassMap<Activity> { public ActivityMap() { this.Table("Activity"); this.Cache.ReadWrite(); this.Version(x => x.ObjectVersion); this.Id(x => x.Id).GeneratedBy.Assigned(); // snipp this.HasOne(x => x.AppointmentRecurrence).Cascade.Delete(); } } public class AppointmentRecurrenceMap : ClassMap<AppointmentRecurrence> { public AppointmentRecurrenceMap() { this.Table("AppointmentRecurrence"); this.Cache.ReadWrite(); this.Version(x => x.ObjectVersion); this.Id(x => x.Id).GeneratedBy.Foreign(

Is @JoinColum implicitly specified when we use any association type annotation like @OneToOne , @OneToMany , etc. Here is snippet from Student entity in association with Laptop entity Case 1) Without using explicit @JoinColum @OneToMany(cascade=CascadeType.ALL) private List<Laptop> laptops=new ArrayList<Laptop>(); Case 2) Using explicit @JoinColum @OneToMany(cascade=CascadeType.ALL) @JoinColumn private List<Laptop> laptops=new ArrayList<Laptop>(); When I check DEBUG both cases have "almost" similar Binding , i.e something like below. 1) So could I assume @JoinColum is implicitly specified when

This is what I would like to do, map an object to another table that has the same primary keys. The below is an example, basically I have one object with a composite key that has a composite key for ANOTHER table, but I don't know how to include both in order to create the proper object key. I highlighted the row that is wrong, it only includes one of the properties for the key. <class name="BusinessRuleObject" table="BUSINESS_RULE_OBJECTS" schema="DB"> <composite-id name="businessRuleObjectId" class="BusinessRuleObjectId"> <key-property name="sameIdCode" column="ID_CD" /> **<key-many-to-one

Using following code I can successfully retrieve address fields of a user, to do that I need to define all its fields using Projection. Imagine address has 100 fields, in this case I have to define all of them. I am wondering if I can return just address object of customer without defining all its fields in Proposition? I know I can retrieve id of address and use that to retrieve its object, but I am wondering if there is ano other method rather than this or defining all its fields. Hibernate ..... Criteria cre = session.createCriteria(User.class, "user") .createAlias("user.address", "addr");