从 Hibernate 实体生成 er 图

Question

I would like to generate ER diagram from Hibernate entities or Hibernate mapping. I have selected visual paradigm tool which provides this feature. I would like to know your feedback about visual paradigm or some other tools if you know which supports the above feature.

Answer 1

If you are using IntelliJ Idea (Ultimate) you can use Persistence Tool Window. In order to use this feature, you have to add Java EE Persistence Framework Support to your project or module. ( Note: To do that, go to Project Tool Window: right-click a module folder and select Add Framework Support.)

For the tool window to be available, there must be a JPA- or Hibernate-enabled module in your project, ie a module with a JPA or Hibernate facet.

To open the tool window, do one of the following:

• Select View > Tool Windows > Persistence
• If the tool window bars are currently shown, click the Persistence button (normally located at the lower-left part of the workspace).

After that, you can generate persistence mapping. Then Right-click on the generated persistence unit and select “ER Diagram”.

References:

• https://www.jetbrains.com/help/idea/persistence-tool-window.html
• https://nixmash.com/post/using-intellij-persistence-view-and-er-diagram-mapping-tools

Answer 2

Single version of truth

Please do not use the entitys to modify the structure of the database:

1. if you add a non-null non-default column to a entity the database can not be changed if there are rows in that table because the initial value of that column can not be calculated.
2. If you add a fk to a table some values might have illegal references. You do not like to have this problems in deployment.

Use the tools of db managers instead please and calculate the entitys from the db.