Sharing databases between projects within Intellij

Go to the Database tool window and click on the Data Source Properties button. Select the data source you want to make global. Click on the Make Global button in the tool bar above.

The Make Global button looks like this:

Now you can use the data source from all your projects. However a global data source is not stored in the project files, so any other developers working on the same project will need to define their own data source.

The Make Global button is no longer green (Intellij Ultimate 2018.02).

It's located above the datasource list, as in the (crappy) screenshot.

In Intellij 2020.1, click on the Database view, then click on "Data Source Properties" (database with wrench icon). On the dialog that opens, click on "Make global", which is the 5th icon (screenshot below).