Adding and deleting from the database

17 Nov '12, 11:24 AM
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Hi to all!

I'm using the derby database in my project and I have some problems with it.

I've synchronized my database three times now and I have three tables for each model/relation. I was wandering how can I delete the old tables and how to synchronize changing the current tables and not adding new ones.

I was trying with 'Execute SQL' to delete things but there where some problems with the 'user' table too.

Thanks for the responses,

Enric Sangrà

 
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Hi,

to get the desired result, I suggest you to create a new database such as:

jdbc:derby://localhost:50102/Acme2;create=true

You should remove the duplicate tables from the Data Model, if any. When the Data Model is correct and it contains the needed tables, you can synchronize your Data Model with the database. During the synchronization process, you only have to Export the entities and relationships to the database. At the end, the tables will be created in the database and they will be mapped with the Data Model elements.

For more details, you can refer to this wiki article:

The Data Model Mapping

The User, Group and Module entities cannot be removed from the Data Model, because they are needed for the user profiling and the user authentication.

The problem that you get while executing the delete command could be related to the dependencies among the tables. For example, you cannot delete the User table if other existing tables, such as the Group table, depends on it.

   
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