When you execute the DESC DATASOURCE_JDBC <Datasource> command from the VQL Shell of the Administration Tool instead of a JDBC client, it will return information that should only be used for debugging purposes and can change between updates of the Denodo Platform.
instead of using the DESC DATASOURCE JDBC <DataSource> command you can create a view using the DESC VQL DATASOURCE JDBC <DataSource> command which will return the VQL information of your Data Source, including testOnBorrow. As this VQL information is included in a single Text column, you will need to parse the Text to get your information.
You can find more information on how to parse Text with Denodo Functions in Section [Text Functions](https://community.denodo.com/docs/html/browse/8.0/en/vdp/vql/functions/text_functions/text_functions) of the Virtual Dataport VQL Guide.
Hope this Helps!