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Provides a list of available database connections, optionally limiting to a given list.

• name (mandatory) is the unique name of the parameter.
• type (mandatory) must be databaseconnection.
• label (mandatory) (translatable) is the descriptive title of the field.
• description (optional) (translatable) tooltip for the form field.

Example XML Definition:

<field name="dbtype" type="databaseconnection"
	label="COM_CONFIG_FIELD_DATABASE_TYPE_LABEL"
	description="COM_CONFIG_FIELD_DATABASE_TYPE_DESC"
	supported="mysql,mysqli,postgresql,sqlsrv,sqlazure"
	filter="string" />