/wp-content/uploads/2015/03/create_678260.pngPrerequisites


You should have done the following steps:


#1 – OData CRUD Crash Course – Query

#1 – OData CRUD Crash Course – Read


Step-by-Step Procedure


– Building Create operation

1. In SAP transaction SEGW, expand a project folder and open TravelAgencySet. Click on Create and choose Go to ABAP Workbench. As the first implementation, you’ll see the popup.

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2. Click on the *_DPC_EXT folder. The right pane should show the Class Interface shown in the next step. You’ll see the list of the methods. Scroll down – click and focus on the “…_CREATE_ENTITY” and press the Redefine icon.

Tip: Make sure if your editor is in edit mode with the /wp-content/uploads/2015/03/edit_674199.pngicon. Redefine icon is /wp-content/uploads/2015/03/redefine_674200.png.

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3. Delete the commented out lines of code. You have an empty implementation. If you click “Signature” text, you’ll see the in & out parameters of this method. We’ll implement so that it returns “ER_ENTITY” parameter.

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Here’s implementation:

   Naming convention:
   l - local scope
   t - table
   s - structure
   v - variable

01 method TRAVELAGENCYSET_CREATE_ENTITY.
02
03   DATA: ls_entityset    TYPE stravelag,
04         ls_key_tab      TYPE /iwbep/s_mgw_name_value_pair,
05         lv_error_entity TYPE string.
06
07   io_data_provider->read_entry_data( IMPORTING es_data = ls_entityset ).
08
09   ls_key_tab-value = ls_entityset-agencynum.
10
11   INSERT into stravelag values ls_entityset.
12
13   IF ( sy-subrc = 0 ).
14 * entity inserted
15     er_entity = ls_entityset.
16   ELSE.
17 * entity alredy exists
18     CONCATENATE iv_entity_name
19                 '('''
20                 ls_key_tab-value
21                 ''')'
22       INTO lv_error_entity.
23     RAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception
24       EXPORTING
25         textid      = /iwbep/cx_mgw_busi_exception=>resource_duplicate
26         entity_type = lv_error_entity.
27   ENDIF.
28
29 endmethod.

#05 declares a variable which can have the error message if the Create operation failed. #07 picks up the entity value which comes in from the OData client. #09 sets the key value “agancynum” in a local key-value table (this will be helpful in other enhancement H2G later). #11 does a simple insert command to store a new entity value in the TravelAgency table. If the command goes successful, the sy-subrc value should be 0. #18 – #26 sets the user-friendly error message saying the key value already exists in the TravelAgency table.

Make sure you activate it by /wp-content/uploads/2015/03/activate_675699.pngicon.


– Testing Create operation

1. Do the Query operation. In the query step, set the two HTTP Header parameters – these are required to do any data modification (either Create/Update/Delete) against OData services in SAP Gateway.

X-CSRF-Token = Fetch

Content-Type = application/atom+xml; charset=UTF-8

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2. In a response header, you’ll find the token value in X-CSRF-Token. Copy it. (Note: the token will keep valid until the browser gets closed)

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3. Replace the copied value with “Fetch” string. Now your REST client is ready for Create operation via HTTP POST.

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4. Choose one of the entities in the returned Query operation – in <id> tag.

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5. Run the Read operation.

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6. You should obtain the entity value in a response body. Copy it.

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7. And paste it in the Body payload.

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8. By making use of this body content, we’ll create a new entity. For this case just change the <d:Agencynum> value to a new one which doesn’t yet exist on the TravelAgency table. You can change other values if you like – but make sure the XML tag is well formed by a set of opening and closing tags.

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9. Let’s issue by HTTP POST. The URL is /TravelAgencySet without any key value.

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10. You should receive HTTP 201 Created. The Create operation executed successfully!

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What’s next? You can choose either of:

Update operation

Delete operation



List of H2Gs

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1 Comment

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  1. paul thompson

    If you find you don’t have any test data for this service please go to the ABAP Editor (SE38) and execute the SAPBC_DATA_GENERATOR program.

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