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Hibernate Self Join Many to Many Mapping using self set of id's

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1

I'm trying to create a new hibernate self many-to-many mapping using a set of Long Id's (self id's) what is the correct mapping for it?

I trying to create a mapping between Person and his friends(Persons off course)
I have a Person class map to a tbl_person table.

Person.java

public class Person 
 private Long personId;
 private String name;
 //much more properties in here make this object huge
 private Set<Person> friends= new HashSet<Person>();

hibernate Person.hbm.xml mapping:

<set name="friends" table="friends" cascade="none" lazy="false">
 <key column="friend_id"/>
 <many-to-many column="person_id" class="com.kruders.model.bean.Person"/>
</set>

consider Person class extremely big.
Instead of doing:

 Set<Person> friends

I want to use a set of Person Ids:

 Set<Long> friendsIds

this way I won't be able to hold the entire Person object(again, very big) in memory.

hibernate xml mapping:

Expected results is a mapping table personId (foreign key to tbl_person) to friend (foreign key to tbl_person)
The id of that table is a composite of both columns.

tbl_friends

personId|friend
1 |2
1 |3
2 |1

Thank you.

java hibernate hibernate-mapping

share|improve this question

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  why don't you use lazy true?
  
  – Syed Mehtab Hassan
  Mar 28 at 16:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your answer. I will use lazy='true' but do you know how the correct mapping should be look like?
  
  – Maor Shetrit
  Mar 31 at 7:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no way in my knowledge that keep only ids through mapping physically only id is stored but it referes to whole object
  
  – Syed Mehtab Hassan
  Mar 31 at 7:49
  

  
  
  
  

add a comment
 | 

1

I'm trying to create a new hibernate self many-to-many mapping using a set of Long Id's (self id's) what is the correct mapping for it?

I trying to create a mapping between Person and his friends(Persons off course)
I have a Person class map to a tbl_person table.

Person.java

public class Person 
 private Long personId;
 private String name;
 //much more properties in here make this object huge
 private Set<Person> friends= new HashSet<Person>();

hibernate Person.hbm.xml mapping:

<set name="friends" table="friends" cascade="none" lazy="false">
 <key column="friend_id"/>
 <many-to-many column="person_id" class="com.kruders.model.bean.Person"/>
</set>

consider Person class extremely big.
Instead of doing:

 Set<Person> friends

I want to use a set of Person Ids:

 Set<Long> friendsIds

this way I won't be able to hold the entire Person object(again, very big) in memory.

hibernate xml mapping:

Expected results is a mapping table personId (foreign key to tbl_person) to friend (foreign key to tbl_person)
The id of that table is a composite of both columns.

tbl_friends

personId|friend
1 |2
1 |3
2 |1

Thank you.

java hibernate hibernate-mapping

share|improve this question

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  why don't you use lazy true?
  
  – Syed Mehtab Hassan
  Mar 28 at 16:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your answer. I will use lazy='true' but do you know how the correct mapping should be look like?
  
  – Maor Shetrit
  Mar 31 at 7:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no way in my knowledge that keep only ids through mapping physically only id is stored but it referes to whole object
  
  – Syed Mehtab Hassan
  Mar 31 at 7:49
  

  
  
  
  

add a comment
 | 

I'm trying to create a new hibernate self many-to-many mapping using a set of Long Id's (self id's) what is the correct mapping for it?

I trying to create a mapping between Person and his friends(Persons off course)
I have a Person class map to a tbl_person table.

Person.java

public class Person 
 private Long personId;
 private String name;
 //much more properties in here make this object huge
 private Set<Person> friends= new HashSet<Person>();

hibernate Person.hbm.xml mapping:

<set name="friends" table="friends" cascade="none" lazy="false">
 <key column="friend_id"/>
 <many-to-many column="person_id" class="com.kruders.model.bean.Person"/>
</set>

consider Person class extremely big.
Instead of doing:

 Set<Person> friends

I want to use a set of Person Ids:

 Set<Long> friendsIds

this way I won't be able to hold the entire Person object(again, very big) in memory.

hibernate xml mapping:

Expected results is a mapping table personId (foreign key to tbl_person) to friend (foreign key to tbl_person)
The id of that table is a composite of both columns.

tbl_friends

personId|friend
1 |2
1 |3
2 |1

Thank you.

java hibernate hibernate-mapping

share|improve this question

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

public class Person 
 private Long personId;
 private String name;
 //much more properties in here make this object huge
 private Set<Person> friends= new HashSet<Person>();

<set name="friends" table="friends" cascade="none" lazy="false">
 <key column="friend_id"/>
 <many-to-many column="person_id" class="com.kruders.model.bean.Person"/>
</set>

 Set<Person> friends

 Set<Long> friendsIds

personId|friend
1 |2
1 |3
2 |1

share|improve this question

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

share|improve this question

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

edited Mar 28 at 14:35

roeygol

4,79855 gold badges3131 silver badges6262 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges

asked Mar 28 at 14:10

Maor ShetritMaor Shetrit

5511 silver badge66 bronze badges