Win a copy of Murach's MySQL this week in the JDBC and Relational Databases forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
  • Mikalai Zaikin

Composite Foreign Key that maps to Unique Constraint

Posts: 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • 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!

    Bookmark Topic Watch Topic
  • New Topic