• 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 ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

"type" in mapping

 
Ranch Hand
Posts: 115
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi all....i am new to hibernate as well as to this forum...
please clarify me:
what is the need to mention hibernate-type in mapping as we have already declared type in class attributes and columns of the table.

thanks for your support.
 
Ranch Hand
Posts: 1258
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
The "type" attribute is used in a variety of scenarios ... such as mapping custom data types you've created. Also, some times can be mapped to many different SQL types (consider java.util.Date being mapped to either "date" or "timestamp"). Etc ....
 
ranger
Posts: 17347
11
Mac IntelliJ IDE Spring
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
A little more detail is that that type is just a String for Hibernate to use to map the Java Type to the Database Type. So when you say type="date" there is a mapping file for Hibernate to see what database you are using and it tells how to convert a Java type to that database type that matches. So for different databases, the database type for the same java type might be different, but they are all using the same hibernate type.

For instance a type



So the type you use in your mapping file is "date" but the Java Type and the Database type might need to be different for different database.

The example above is made up to demonstrate what we mean and are not the exact mappings that Hibernate does.

Mark
 
Liar, liar, pants on fire! refreshing plug:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic