Connection to a database
Enable the Database Tools and SQL plugin
This functionality relies on the Database Tools and SQL plugin, which is bundled and enabled in PyCharm 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 then select.
Open the Installed tab, find the Database Tools and SQL plugin, and select the checkbox next to the plugin name.
To connect to a database, PyCharm requires connection details (for example, host, port, password, SSH configuration settings, and so on). For every database, the connection details are stored in a dedicated connection configuration — data source.
For a data source, connections to the database are established in special wrappers — sessions. Each session is a wrapper over a single connection, and it stores the connection's information (for example, whether it is active or not, transaction control mode, and other settings).
Sessions can have clients — files, whose queries are sent via the connection that the session holds. Data editor can also be a client for a session.
Depending on the way you create a new session, it can be connected either automatically, or after a certain action. Green dot in the corner of session's icon indicates the connected status.
You can create a new session by doing either of the following:
Open a query console or view database object's data in data editor.
As a result, under the data source node in the Services tool window, the new session node appears with a client node under it.
For a query console, the session will be connected once you perform an action that requires interaction with the database. For example, once you run a query.
For a table, the session is connected automatically, as PyCharm requires an active connection to request the table data from the database, receive it, and display it in the data editor.
As a result, the new connected session node appears under the data source node in the Services tool window.