server-tools/base_external_dbsource/views/base_external_dbsource.xml

<?xml version="1.0"?>
<odoo>
    <!-- DBSource -->

        <record model="ir.ui.view" id="view_dbsource_tree">
            <field name="name">base.external.dbsource.tree</field>
            <field name="model">base.external.dbsource</field>
            <field name="type">tree</field>
            <field name="arch" type="xml">
                <tree string="External DB Sources">
                    <field name="name"/>
                    <field name="connector"/>
                    <field name="conn_string"/>
                </tree>
            </field>
        </record>

        <record model="ir.ui.view" id="view_dbsource_form">
            <field name="name">base.external.dbsource.form</field>
            <field name="model">base.external.dbsource</field>
            <field name="arch" type="xml">
                <form string="External DB Source">
                    <sheet>
                        <group>
                            <group>
                                <field name="name"/>
                            </group>
                            <group>
                                <field name="password" password="True"/>
                            </group>
                        </group>
                        <group col="1">
                            <field name="connector"/>
                            <field name="conn_string"
                                   placeholder="Please check the tooltip for connection string examples"/>
                            <button name="connection_test" string="Test Connection" type="object" icon="fa-refresh"/>
                        </group>
                    </sheet>
                </form>
            </field>
        </record>

        <record model="ir.actions.act_window" id="action_dbsource">
            <field name="name">External Database Sources</field>
            <field name="res_model">base.external.dbsource</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
            <field name="view_id" ref="view_dbsource_tree"/>
        </record>

        <menuitem name="Database Sources" id="menu_dbsource" parent="base.next_id_9" action="action_dbsource"/>
</odoo>