Hello everyone.
Lest pretend I have:
Table A with A Entity
Table B with B Entity
JoinTable C between A and B which contain FK on A and B tables also.
So on, I also will have the table and Entity class the name for examle Alphabet:
So Between class Alphabet and A Entity and B Entity I will have an Undirectional, JoinTable, OneToMany relationships.That's mean that Classes A and B will know about Alphabet class, but Alphabet will not know about A and B. When I will try to enset data to my database from A side to class B and class Alphabet I will have an exception like this:
Hibernate: insert into C (A_ID, Alphabet_ID) values (?, ?) ERROR: org.hibernate.util.JDBCExceptionReporter - Field 'B_ID' doesn't have a default value ERROR: org.hibernate.event.def.AbstractFlushingEventListe ner - Could not synchronize database state with session
If I will do this from B side I will have an error like this:
Hibernate: insert into C (B_ID, Alphabet_ID) values (?, ?) ERROR: org.hibernate.util.JDBCExceptionReporter - Field 'A_ID' doesn't have a default value ERROR: org.hibernate.event.def.AbstractFlushingEventListe ner - Could not synchronize database state with session
That's meant that some of my foreign keys an JoinTable C did not get an ID because I'm inserting it from side which is can not to generate or insert data to this jointable C, I don't know why? If I will add to my JoinTable database schema for some of my foreign key like A_ID or B_ID the DEFAULT "number" than it is works, it's inser data, but it will always insert the same Number by DEFAULT which I put in "number". But What I want, is to give for one of my problem foreign key's in joinTable C the same value as in parient table A or B!!! Maybe I can use some of the @Generator annotation from Hibernate for my JoinTable in my Entity class.
Thank you.
Lest pretend I have:
Table A with A Entity
Code:
@Entity
@Column(name="A")
public class A{
@ManyToMany
@Cascade(org.hibernate.annotations.CascadeType.ALL)
@JoinTable(name="C",
joinColumns=@JoinColumn(name="A_ID"),
inverseJoinColumns=@JoinColumn(name="B_ID"))
public B b;
//set and get methods
}Code:
@Entity
@Column(name="B")
public class B{
@ManyToMany
@Cascade(org.hibernate.annotations.CascadeType.ALL)
@JoinTable(name="C",
joinColumns=@JoinColumn(name="B_ID"),
inverseJoinColumns=@JoinColumn(name="A_ID"))
public A a;
//set and get methods
}So on, I also will have the table and Entity class the name for examle Alphabet:
Code:
@Entity
@Column(name="Alphabet")
public class Alphabet{
private Data anydata;
//set and get methods
}Quote:
Hibernate: insert into C (A_ID, Alphabet_ID) values (?, ?) ERROR: org.hibernate.util.JDBCExceptionReporter - Field 'B_ID' doesn't have a default value ERROR: org.hibernate.event.def.AbstractFlushingEventListe ner - Could not synchronize database state with session
Quote:
Hibernate: insert into C (B_ID, Alphabet_ID) values (?, ?) ERROR: org.hibernate.util.JDBCExceptionReporter - Field 'A_ID' doesn't have a default value ERROR: org.hibernate.event.def.AbstractFlushingEventListe ner - Could not synchronize database state with session
Thank you.