Step by Step Odata Part 3

7/24/2019 Step by Step Odata Part 3

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volker.drees

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Thanks for sticking to this multi-part step-by-step guide.

Looking into this part (3) means that you have successfully completed the first part (1)and the second part (2)

and you are now curious to see how our EPM OData Service will be e xtended with an Association and a Navigation

Property. This will allow us to navigate from the Sales Order to the related Sales Order Line Items by using a linkinstead of manually putting a filter together. Furthermore this also allows us to use the $expand statement to fetch the

Sales Order together with all Sales Order Line Items in one http call.

We are still in the Service Builder and enhancing our project that we created in part 1 and extended in part 2.

1. Double-clickAssociations:

2. Choose the Create pushbutton:

3. Enter the following values for the Association and choose Enter:

Name SalesOrderSalesOrderItems

Principal Entity* SalesOrder

Principal Entity Cardinali ty* 1

Dependent Entity* SalesOrderItem

Dependent Entity Cardinali ty* M

*) This field has an input help

Now we will Create a referential constraint for the association

1. Expand theAssociationsnode and the SalesOrderSalesOrderItemsnode and double-click Referential Constraints:

Step-by-step guide to build an OData Service basedon RFCs Part 3

Posted by Volker Dreesin volker.dreeson Oct 26, 2012 11:45:07 AM

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Step-by-step guide to build an OData Service based onRFCs Part 3



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2. Choose the Createpushbutton:

3. Enter the following values and choose Enter:

Principal Key* SoId

Dependent Property* SoId


Now we create an association set for the association

1. Double-clickAssociation Sets:


3. Enter the values and choose Enter:

Name SalesOrderSalesOrderItems

Association* SalesOrderSalesOrderItems


Re: expand query option in OData

Consuming an External RESTful Web Servicewith ABAP in Gateway

Re: Not able to fetch data using OdataGet_Entityset in SEGW

Re: Input Parameters for Odata Service

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And finally we create a navigation property based on the referential constraint

1. Expand Data Model -> Entity Types -> SalesOrderand double-click Navigation Properties:


3. Enter the following values and choose Enter:

Name SalesOrderItemsRelationship Name* SalesOrderSalesOrderItems


Now we need to re-generate the runtime objects and were then ready to test the service

1. Choose the Generatepushbutton:

2. Verify that the runtime objects have been generated successfully:

3. Start the Gateway Client (Transaction/IWFND/GW_CLIENT) in a separate window to run the service. Provide the

following URI to get the metadata for the service:

/sap/opu/odata/sap/ZGW100_XX_SO_SRV/$metadata

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The Sales Order collection now includes a navigation property.

4. When you now select a sales order entry using

/sap/opu/odata/sap/ZGW100_XX_SO_SRV/SalesOrderCollection('0500000001'), for example, you can simply add

the navigation link/SalesOrderItemsto navigate to the line items without having to set a filter yourself:

5. And finally you can use$expand to read all sales order items for a given sales order in a single http call.

Simply provide the following URI:

/sap/opu/odata/sap/ZGW100_XX_SO_SRV/SalesOrderCollection('0500000001')/?$expand=SalesOrderItems

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does not know that both entities can be obtained using a single RFC call, it executes two calls to the underlying BAPI.

This can be improved by manually implementing (re-defining) the GET_EXPANDED_ENTITYmethod.

So we are done. The Service is up and running.

I hope you enjoyed creating and consuming an OData Service that is based on RFC modules.

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Products: sap_netweaver_gatewayTopics: mobileTags: gateway, odata, netweaver_gateway, service_builder

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Wouter PeetersOct 6, 2013 1:42 PM

Hi Volker,

Thx, these are a great tutorial series to get started with Gateway.But I'm having some troubles adding a navigation torwards the Product Detail, from the Sales OrderItem entity. Do you have any pointers? Maybe this is a good idea for a part 4.

Regards,wouter

Like (1)

Volker DreesOct 8, 2013 10:32 AM(in response to Wouter Peeters)

Hi Wouter,

thanks for the feedback.Navigating from a Line Item to the related Product is a little trickier. This is because the URIthat you use (e.g. ".../SalesOrderItemCollection( SoItemPos=..., SoID=...)/ToProduct" ) onlyhas the key information of the Line Item. In order to be able to navigate to the product entryyou first need to read the Line Item detail to fetch the related Product-Id, and from there fetchthe entire product.Luckily this is taken care of by the Service Builder as well. You just need to make sure tomaintain the Association and the Referential Constraint between the Line Item and theProduct.hth.Regards, Volker

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Wouter PeetersOct 8, 2013 12:04 PM(in response to Volker Drees)

Hi Volker,

Thanks for the reply, for more information there's a topic on the matter:http://scn.sap.com/thread/3434085

Regards,Wouter

Vijay DudlaMay 13, 2014 1:05 PM(in response to Volker Drees)

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Hi Volker,I did the same steps but unable to use the navigation or expand option? what wasthe issue.Below is the metadata for my service.-------------ThanksVijay

http://www.web2pdfconvert.com/?ref=PDFhttp://www.web2pdfconvert.com/?ref=PDFhttp://www.w3.org/2005/Atomhttp://sapcis01.citrite.net:8080/sap/opu/odata/sap/ZDEMO09_SRV/$metadatahttp://www.w3.org/2005/Atomhttp://sapcis01.citrite.net:8080/sap/opu/odata/sap/ZDEMO09_SRV/$metadatahttp://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://schemas.microsoft.com/ado/2008/09/edmhttp://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22http://www.sap.com/Protocols/SAPDatahttp://schemas.microsoft.com/ado/2007/08/dataservices/metadatahttp://schemas.microsoft.com/ado/2007/06/edmxhttp://scn.sap.com/people/volker.drees/blog/2012/10/26//l%20%22%22


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Shakeeluddin KhajaNov 24, 2014 1:47 PM

Very useful info . Thanks Volker

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Starlet AbrahamDec 8, 2014 10:52 AM

Hi Volker,Your Tutorial has been very helpful. I am learning Webservices from scratch.

I have a doubt.I cant find the ASSOCIATION SETSblock in my SEGW Project. Would there be a reason for this?ThanksAbraham

Like (0)

Volker DreesDec 8, 2014 4:25 PM(in response to Starlet Abraham)

Hi Abraham,I assume you are using a newer version of SAP NetWeaver Gateway (the blog was writtenfor SP5)?The Gateway Framework is automatically generating the Association Sets based on thedefined Associations. That's the reason why the Service Builder is not showing them in thenavigation tree anymore. But you can still create own Association Sets i f you want (Right-Click on Data Model and choose Create -> Association Set).

Best Regards, Volker

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Rahul KeshavMay 25, 2015 10:28 AM

It worked for me...Thanks Volker......

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Amber BadamMay 26, 2015 1:55 PM

very illustrative. nice blog. appreciate it.

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Kavitha FredrickJul 3, 2015 9:32 AM

Very Informative..Thanks.

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Sara ZhangSep 24, 2015 5:26 AM

Hi Volker,

It is a wonderful doc, I can not tell you how much I appreciate your work, thanks.
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Step by Step Odata Part 3