This week's book giveaways are in the Refactoring and Agile forums.
We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line!
See this thread and this one for details.
Win a copy of Re-engineering Legacy Software this week in the Refactoring forum
or Docker in Action in the Cloud/Virtualization forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

Composite Foreign Key that maps to Unique Constraint

Gir Dus
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi I have 2 tables (table1 & table2). Table 1 has 2 columns(table1ColA & table1ColB) which are unique. Table2 has 2 similar columns which I define as foreign keys of Table1.

So Table2 (table2ColA & table2ColB) == foreign key reference to Table1(table1ColA & table1ColB)

When I try to generate the Hibernate Mapping Files, this is the error I get

"org.hibernate.MappingException: Foreign key (FKCB773E2441174225:table2 [table2ColA,table2ColB])) must have same number of columns as the referenced primary key (table1 [id])"

Why is hibernate trying to pick table1's primary key as the referenced primary key when in mySQL the foreign key is defined as (table1ColA & table1ColB) which have unique constraint on them? How do I tell Hibernate to use the foreign key defined in mySQL as the foreign key and not assume that the primary key of the referenced table is the foreign key? Table definition can be found below. Thanks!

  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic