4. Implementation Guide for GET_ENTITYSET Method of SAP ABAP OData Service Data Provider Class

In the three steps of this tutorial so far, we have not seen the book information stored on the SAP ABAP server through OData service consumption, read and returned to the browser. Many beginners may haveI feel no sense of achievement.

It doesn't matter, this article will start to implement the read operation of the book management OData service, that is, by redefining the OData data provider class, the GET_ENTITYSET method of the Data Provider Class (referred to as DPC), to return book information.

After this step is completed, we execute the test tool of the SAP ABAP OData service, the transaction code /IWFND/GW_CLIENT, can return the following results:

The highlighted area in the above picture is a book data in the system.

This article will detail how to return this data to the consumer of the OData service through the GET_ENTITYSET method of DPC_EXT.

Open the transaction code SEGW, find the OData project we created in the previous steps, and you can also see the full name of the Metadata Provider Class (MPC) here.

We use SE24 or SE80 to open the GET_ENTITYSET method of ZCL_ZBOOK_MANAGE_DPC_EXT, click the menu Goto -> Method Definition, and view the interface definition of this method, that is, the definition of input parameters and output parameters.