To implement simple CRUD (Create, Read, Update, Delete) operations in Adobe Campaign Classic via an internal application, the best approach is to use Data Schema Methods. Data Schema Methods allow real-time interaction with Adobe Campaign’s database by exposing a set of predefined APIs for managing data entities directly. These methods are suitable for synchronous operations, which are typical for real-time applications.

In Adobe Campaign Classic, Data Schema Methods are part of the API suite, enabling the external system to perform data manipulations, such as creating, updating, or deleting records in real-time, by leveraging the data schema definitions. These methods provide a direct and efficient way to interact with the Campaign Classic database while respecting data integrity and avoiding the complexity of creating custom workflows or scripts.

Other options, like Workflows or SQL Scripts, are generally suited for batch operations or specific backend processes, not for real-time operations that require immediate feedback. Therefore, Data Schema Methods offer the most direct and reliable solution for CRUD operations in Adobe Campaign Classic in a real-time context.