16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 1/7

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volker.drees

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Thanksforstickingtothismultipartstepbystepguide.

Lookingintothispart(3)meansthatyouhavesuccessfullycompletedthe firstpart(1)andthe secondpart(2)andyouarenowcurioustoseehowourEPMODataServicewillbeextendedwithanAssociationandaNavigationProperty.Thiswillallowus tonavigate from theSalesOrder to the relatedSalesOrderLine Itemsbyusinga linkinsteadofmanuallyputtingafiltertogether.Furthermorethisalsoallowsustousethe$expandstatementtofetchtheSalesOrdertogetherwithallSalesOrderLineItemsinonehttpcall.

WearestillintheServiceBuilderandenhancingourprojectthatwecreatedinpart1andextendedinpart2.

1.DoubleclickAssociations:

2.ChoosetheCreatepushbutton:

3.EnterthefollowingvaluesfortheAssociationandchooseEnter:Name SalesOrderSalesOrderItems

PrincipalEntity* SalesOrder

PrincipalEntityCardinality* 1

DependentEntity* SalesOrderItem

DependentEntityCardinality* M

*)ThisfieldhasaninputhelpNowwewillCreateareferentialconstraintfortheassociation

1.ExpandtheAssociationsnodeandtheSalesOrderSalesOrderItemsnodeanddoubleclickReferentialConstraints:

StepbystepguidetobuildanODataServicebasedonRFCsPart3PostedbyVolkerDreesinvolker.dreeson26Oct201211:45:07

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16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 2/7

2.ChoosetheCreatepushbutton:

3.EnterthefollowingvaluesandchooseEnter:PrincipalKey* SoId

DependentProperty* SoId

*)Thisfieldhasaninputhelp

Nowwecreateanassociationsetfortheassociation

1.DoubleclickAssociationSets:

2.ChoosetheCreatepushbutton:

3.EnterthevaluesandchooseEnter:

16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 3/7

Name SalesOrderSalesOrderItems

Association* SalesOrderSalesOrderItems

*)Thisfieldhasaninputhelp

Andfinallywecreateanavigationpropertybasedonthereferentialconstraint

1.ExpandDataModel>EntityTypes>SalesOrderanddoubleclickNavigationProperties:

2.ChoosetheCreatepushbutton:

3.EnterthefollowingvaluesandchooseEnter:Name SalesOrderItems

RelationshipName* SalesOrderSalesOrderItems

*)ThisfieldhasaninputhelpNowweneedtoregeneratetheruntimeobjectsandwerethenreadytotesttheservice

1.ChoosetheGeneratepushbutton:

2.Verifythattheruntimeobjectshavebeengeneratedsuccessfully:

16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 4/7

3.StarttheGatewayClient(Transaction/IWFND/GW_CLIENT) inaseparatewindowtoruntheservice.ProvidethefollowingURItogetthemetadatafortheservice:/sap/opu/odata/sap/ZGW100_XX_SO_SRV/$metadata

TheSalesOrdercollectionnowincludesanavigationproperty.4.Whenyounowselectasalesorderentryusing/sap/opu/odata/sap/ZGW100_XX_SO_SRV/SalesOrderCollection('0500000001'), for example, you can simply addthenavigationlink/SalesOrderItemstonavigatetothelineitemswithouthavingtosetafilteryourself:

5.Andfinallyyoucanuse$expandtoreadallsalesorderitemsforagivensalesorderinasinglehttpcall.SimplyprovidethefollowingURI:/sap/opu/odata/sap/ZGW100_XX_SO_SRV/SalesOrderCollection('0500000001')/?$expand=SalesOrderItems

16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 5/7

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The$expandstatementishandledbytheframework(noadditionalimplementationisrequired).SincetheframeworkdoesnotknowthatbothentitiescanbeobtainedusingasingleRFCcall,itexecutestwocallstotheunderlyingBAPI.Thiscanbeimprovedbymanuallyimplementing(redefining)theGET_EXPANDED_ENTITYmethod.Sowearedone.TheServiceisupandrunning.

IhopeyouenjoyedcreatingandconsuminganODataServicethatisbasedonRFCmodules.

11050Views Products:sap_netweaver_gatewayTopics:mobileTags:gateway,odata,netweaver_gateway,service_builder

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WouterPeeters06Oct201313:42

HiVolker,Thx,theseareagreattutorialseriestogetstartedwithGateway.ButI'mhavingsometroublesaddinganavigationtorwardstheProductDetail,fromtheSalesOrderItementity.Doyouhaveanypointers?Maybethisisagoodideaforapart4.Regards,wouter

VolkerDrees08Oct201310:32(inresponsetoWouterPeeters)

HiWouter,thanksforthefeedback.NavigatingfromaLineItemtotherelatedProductisalittletrickier.ThisisbecausetheURIthatyouuse(e.g.".../SalesOrderItemCollection(SoItemPos=...,SoID=...)/ToProduct")onlyhasthekeyinformationoftheLineItem.InordertobeabletonavigatetotheproductentryyoufirstneedtoreadtheLineItemdetailtofetchtherelatedProductId,andfromtherefetchtheentireproduct.LuckilythisistakencareofbytheServiceBuilderaswell.YoujustneedtomakesuretomaintaintheAssociationandtheReferentialConstraintbetweentheLineItemandtheProduct.

16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

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hth.Regards,Volker

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WouterPeeters08Oct201312:04(inresponsetoVolkerDrees)

HiVolker,Thanksforthereply,formoreinformationthere'satopiconthematter:

http://scn.sap.com/thread/3434085Regards,Wouter

VijayDudla13May201413:05(inresponsetoVolkerDrees)

HiVolker,Ididthesamestepsbutunabletousethenavigationorexpandoption?whatwastheissue.Belowisthemetadataformyservice.

16/04/2015 StepbystepguidetobuildanODataServiceba...|SCN

http://scn.sap.com/people/volker.drees/blog/2012/10/26/stepbystepguidetobuildanodataservicebasedonrfcspart3 7/7

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ThanksVijay

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ShakeeluddinKhaja24Nov201413:47

Veryusefulinfo.ThanksVolker

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StarletAbraham08Dec201410:52

HiVolker,YourTutorialhasbeenveryhelpful.IamlearningWebservicesfromscratch.Ihaveadoubt.IcantfindtheASSOCIATIONSETSblockinmySEGWProject.Wouldtherebeareasonforthis?ThanksAbraham

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VolkerDrees08Dec201416:25(inresponsetoStarletAbraham)

HiAbraham,IassumeyouareusinganewerversionofSAPNetWeaverGateway(theblogwaswrittenforSP5)?TheGatewayFrameworkisautomaticallygeneratingtheAssociationSetsbasedonthedefinedAssociations.That'sthereasonwhytheServiceBuilderisnotshowingtheminthenavigationtreeanymore.ButyoucanstillcreateownAssociationSetsifyouwant(RightClickonDataModelandchooseCreate>AssociationSet).BestRegards,Volker