HSQLDB
Enable the Database tools and SQL plugin
This functionality relies on the Database tools and SQL plugin, which is bundled and enabled in IntelliJ IDEA by default. If the relevant features aren't available, make sure that you didn't disable the plugin.
Press Control+Alt+S to open the IDE settings and select .
Open the Installed tab, find the Database tools and SQL plugin, and select the checkbox next to the plugin name.
HSQLDB
In the Database tool window ( ) , click the Data Source Properties icon
.On the Data Sources tab in the Data Sources and Drivers dialog, click the Add icon (
) and select HSQLDB.Check if there is a Download missing driver files link at the bottom of the data source settings area. As you click this link, IntelliJ IDEA downloads drivers that are required to interact with a database. The IDE does not include bundled drivers in order to have a smaller size of the installation package and to keep driver versions up-to-date for each IDE version.
You can specify your drivers for the data source if you do not want to download the provided drivers. For more information about creating a database connection with your driver, see Add a user driver to an existing connection.
Specify database connection details. Alternatively, paste the JDBC URL in the URL field.
To delete a password, right-click the Password field and select Set Empty.
To ensure that the connection to the data source is successful, click the Test Connection link.
(Optional) If you are connecting to a data source that contains a lot of databases and schemas, in the Schemas tab, select the schemas that you need to work with.
Click OK to create the data source.