Hey there

im just starting to use Hibernate and im having trouble understanding how to embedd an object in my class:


for eg:

Basically you need to map Pet with an id, and then use a many-to-one in Person. The generated Person table should have a foreign key to Pet.

@Entity
public Class Person{

long id;
Pet pet;

@Id
public long getId()
{
return id;
}

public void setId(long id)
{
this.id = id;
}

@ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
public Pet getPet()
{
return pet;
}

public void setPet(Pet pet)
{
this.pet = pet;
}

}

@Entity
public Class Pet{

long id;
String petName

@Id
public long getId()
{
return id;
}

public void setId(long id)
{
this.id = id;
}

public String getPetName()
{
return petName;
}

public void setPetName(String petName)
{
this.petName = petName;
}
}

thankx

thanks for that. However, does using annotations imply that the DB table has to be physically created as opposed to parsing the XML config, hbm files which in turn automatically generate the DB relation

yep got it working

Annotations are just an alternative to using hbm.xml mapping files. In either case you can still have Hibernate generate the database schema for you. The hbm.xml mapping files have the advantage of being more widely used, thus you'll see more examples using these.

yeah but its quite horrible to have to continually make changes every time something within the class changes, hence, if the project is very large then the xml files can slow things down