1·You would do that here, for example, if the message processor needs to make a datasource lookup or other expensive resource connection.
如果消息处理器需要进行一个数据源查询或其他昂贵的资源连接，那么您需要在这里那样做。
2·Bind the resource reference to the deployed datasource.
将资源引用绑定到部署的数据源。
3·This is needed, since there are situations in which the runtime might need to access the federated repository when no datasource is available; in such a situation, direct JDBC access will be used.
之所以必需设置该项，是因为存在以下情况：即当不存在任何数据源时，运行时可能需要访问联合存储库；在此情况下，将使用直接 JDBC 访问。
4·It is also necessary to change some datasource Settings.
更改某些数据源设置也是有必要的。
5·Application scoped datasource: This is used by one or more modules of the same application.
应用程序范围的数据源：它用于同一个应用程序的一个或多个模块。