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Introduction We have substantially explored the CDS views with major functionalities.

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CDS provides another magical strength to the users to expose the views as OData services. There is a conventional way to create a service in SEGW importing the view you created.

This article presents a technique to expose a view as a gateway service just by maintaining a cool annotation. No need to create service through SEGW. Sounds amazing?

sap odata annotations example

OData version 2 has been used for gateway application. A left outer join between two will allow you to select any fields from these two tables.

For simplicity, we took only the fields mentioned in the key. Step — II : Create a second view with Association. Associations in CDS views are more like associations in Gateways. You create an association to conceptually join or associate one data source to a target data source on a condition provided. If data sources can be envisaged as Entities of OData service then associations are joining two entities conceptually. Take special note of the Annotation at the 6th line: OData.

This is the magic spell for our article today. Step — III : Now our view is ready. Step — VI : Once the service is found, click on the service to register and save it in the appropriate package. Note we have not used SEGW to create any service. This service got a utomatically generated due to OData Annotation maintained.

Limitations Please also be informed that this service can only provide GET operation. It might seem insignificant, but it helps more than you might think.

Thanks for the course :. Dear Venkat — Technically no difference. If you want to write and edit, you might need to look for other ways. I can able to perform the read operation. Pleas help me. I am facing difficulty in finding information on the ODATA V4, there is not much information present on internet regarding this.

Dear Aman — We would try to put something soon. Thank you for visiting and leaving your comment. Dear Vijay — Thank you for visiting our page and leaving your feedback.

How to add annotations to an OData service using code based implementation

Were you able to get the icon on your first CDS view? Is the issue only with the 2nd CDS View? Hi, Thanks for quick response.

sap odata annotations example

This question indeed pointed out an important aspect of this entire article. This annotation is only available in ABAP I should have mentioned this in my document.The intention of this tutorial is to show how to generate a UI5 application based on Smart-Templates. Basically, it means to create an ABAP class and overwrite the corresponding base-class-method to define the annotation model.

Annotations are helpful to add semantic information to metadata. For example, the metadata can declare that a property contains data as string. But with an annotation, we can declare that this data is always an eMail address.

They can be added directly in the corresponding xml element, like an attribute, but they can also be collected in a separate section of the metadata document. They can even be located in a separate xml document, which then has to point to the OData service, which should be enriched.

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In our example, the annotation model declares UI elements and binds them to properties of the OData service. Yes, the model belongs to an OData service, although it is defined outside of the service. As such, any existing OData service can be enriched with detailed information about how it should be represented in the UI. This is possible because the used annotations are based on a common public definition, which is stored in a so-called vocabulary.

As such, these annotations can be understood by a UI technology, and that UI technology will render the UI according to the annotations. In our example, the UI technology used to create applications based on annotations is UI5 with its feature called Smart-Templates. That guarantees a unified look at feel, because all applications that are based on those annotations will look similar.

However, the annotation model is not restricted to annotations relevant for UI. It can contain any annotations that are provided by any vocabulary. Create the annotation model using Service Builder tool and verify the xml representation of the annotation model via OData service next blog. Please refer to the Links section at the end of the tutorial for more info about the service.

Imagine that there might be different tools that are use the data that is delivered by that service and those different tools display a different subset of the data, for example. We invoke the Service to see if it is running and we invoke the SalesOrder collection on which our future application will be based.

SAPUI5 Smart features controlled by OData Annotations

Carlos Roggan.In this blog, I will tell how to create basic annotation, odata service which will hold the annotations and then consume it into a smart template application. I have but dont see the import option for Annotations. Gopal Anand. Posted on July 21, 5 minute read.

sap odata annotations example

Follow RSS feed Like. Introduction: In this blog, I will tell how to create basic annotation, odata service which will hold the annotations and then consume it into a smart template application. Now we have table with four fields. So now we are going to define the model defination. So we created a project. Once the Entry type is set.

Hello world to annotations and smart templates with SEGW SAP Gateway

You can see its child. Double click the property under entryType The insert row in yellow will be used to define the properties. The name will be name you give to particular column. ABAP field name will be field name from your table.

Now we will import the annotation library we call it vocabulary. Now comes the part where we need to take care and keep in mind what we are going to make. In our entry type Expand it and find annotations folder.

So with this our annotation definition is completed. Now we need to do something so that our data definition starts getting data from table and show somewhere along with the annotation we gave. The time has come when we will register whatever we made as a service.

We are going to register it and guess what, after registering we will be having our odata service. Steps : we will create the runtime artificat. Well we are done here. Click on maintain to maintain the service in our gateway A new window will openchoose the SAP gateway client form left side corner. It will lead to following tab. Note : we only defined anntotations for our tablenot yet got the data for our odata service. What happens when we try to get our entry type.

We did the data definition in MPC the previous steps. But have not done anything to fetch data from tableso we are getting this error. To read data we need to implement data provider class DPC.

We will redifine our dpc to read data note we will ne changing the get entity set to read all data, for specific data we can choose get entity. I used the following code. Hey we did it.

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Now the time to see what we did to convert into a result. We will create our first smart template project.In this post I want to give an insight into metadata based UI development. I will showcase some of the Smart component features controlled by metadata annotations.

With the use of annotations and Smart components like SmartTable you can minimize the UI View code to be written for conventional scenarios like listing and filtering data. To select columns for smartTable, use LineItem annotation. It applies to EntityTypes, and it is a collection of data fields for representation in a table or list: for documentations see Appendix1: Annotationson how to add annotations see Appendix2: Adding annotations to metadata.

Data fields are value paths pointing to properties of our entityType, navigationProperties can be used as path too. By default, the framework recognizes CategoryID type as described in the metadata model: Int Pressing Value Help icon displays value help popup where filter conditions can be defined for CategoryID as Int32 number: equal to, between, less than, ….

To list an entitySet as possible values for a property, use ValueList annotation. It applies to property or parameter, and specifies how to get a list of acceptable values for such property or parameter: for documentations see Appendix1: Annotationson how to add annotations see Appendix2: Adding annotations to metadata.

The list of allowed values is provided as a separate entity set that can be found by interpreting the V4-style annotation Common. ValueList on the same property. To display a human readable text value instead of ID, a reference can be defined for entityType properties.

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Notice that this is just a display option, in the background CategoryID property will be sent to server not the Name property when filtering Products, which is the desired behaviour. Example: edm:Property. Can be placed into the same metadata. In the UI client, the server side metadata descriptor can be extended with OData 4. Annotation file then needs to be referenced in manifest:. Annotation file and the reference to the OData service in manifest will be created:.

CDS Annotations. With the use of Smart components UI behaviour can be controlled by metadata annotations without modifing the UI View code. We saw examples of smart features, and ways to extend metadata with annotations. Technical Articles. Posted on March 10, 9 minute read. Follow RSS feed Like. Hi, In this post I want to give an insight into metadata based UI development.

Resolution: To select columns for smartTable, use LineItem annotation. With annotations added filtering again in the UI will list items successfully: Notice that no additional View code had to be written, only adding annotations to our model. Pressing Value Help icon displays value help popup where filter conditions can be defined for CategoryID as Int32 number: equal to, between, less than, … Resolution: To list an entitySet as possible values for a property, use ValueList annotation.

Annotation file then needs to be referenced in manifest: "sap. Regards, Peter.

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Alert Moderator.As a format and protocol, OData has many features. OData already comes with the concept of metadata, in the form of the metadata document. However, that information can be enriched through the addition of annotations, which can be managed in layers. Annotations allow you to define additional characteristics that have meaning beyond the basic technical aspects in the metadata document:.

Metadata annotations can be provided in different ways: directly within the entity type definitions, outside of the entity type definitions but still within a metadata document, or separate to the metadata document entirely.

Open the following URL:. Find the definition of the Supplier entity type, and look at the attributes in the XML. These are basic annotations that are already part of the metadata document, built directly into this entity type definition.

Rather than being directly embedded within the entity type definition, these annotations are separately defined, but are still within the metadata document. In the next step in the wizard, Data Connectionyou get to specify an OData service upon which the app is to be based. It can then present the available OData services in a list for you to select from. This time, select the Suppliers entity set, and in the entity set details shown, notice the Annotations tab that shows which data processing operations are supported.

In the next step, Annotation Selectionthe wizard queries the catalog service for the chosen OData service to see if any external annotations exist. This is done in the Template Customization step of the wizard. To keep things simple, just choose the Suppliers entity set for the main mandatory OData collection and leave the other fields as they are. You can run the app immediately, by using the context menu on the new SupplierData project in your workspace:.

Once the app is displayed, selecting the Go button reveals empty lines of data, showing that there are not enough annotations to properly drive this app.

sap odata annotations example

Have a look for yourself by expanding the folders within the SupplierData project in your workspace. Leave the values for the fields in the wizard as they are, and follow the wizard through to completion. In other words, this will be an external set of annotations to enhance the metadata of the OData service.

Open up the annotation0. Use the plus symbol on the right to add a local annotation, specifically the LineItem annotation from the UI vocabulary:. Now create a node within the UI. LineItem by using its plus symbol and choosing DataFieldWithUrl from the dialog box that appears — the dialog box will be similar to the previous one, but with different choices.

This UI. In addition, at the UI. Specify the property FormattedAddress in the Property field. Save the annotations and run the app again to see the effect. Fix this by adding another local annotation, in the same way you did in the previous step. PresentationVariant annotation.

Then using the plus symbol at this new UI. PresentationVariant level, add a SortOrder property. Within that using the plus symbol at that level you must then add a SortOrderType. Once you do this, and then also specify the property Name for the property within the SortOrderType node, this is what it should look like:. Rerun or refresh the app and you should see the same display as before, but with the entries sorted by company name. The final annotations you will add are ones that will adorn the app display with appropriate header information.

In a similar way to the previous two steps, add a UI.In UI view smartfield control is used for Customer field. Notice Postal Code and City fields below. For UI to use labels for columns and filter input we will have to define labels in class.

Create a class and defined text symbols in that class.

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Refer code below. Read more about soft state. After this value help button appears next to input. Check the code below. And this request is handled well by helper class. Note that search is working on all columns. Also, value help dialog working with filters. This search based on filter values execute below query to the backend.

Have you found a way to use the ValueList annotation for a Value Help that is dependent on another property? The Value Help for the Region property should be limited to only those regions within the selected Country, and the same goes for the Value Help of the City property.

So far, I have not had any luck. Assign text symbol to all fields which you plan to use in value help. Read more about soft state Explanation of what is what. After above code, if you check metadata you should see annotation. Search help is now fully functional in UI. Classical Dynpro — Placing checkbox right way. Having trouble accessing OData service following Single Sign-on implementation. Leave a Reply Cancel reply. We use cookies and similar technologies "cookies" to help give you the best experience on our site and to show you relevant advertising.Details on OData.

Create, Update and Delete actions are shown on the custom transparent table data just to simplify the article and do not move focus from OData Service creation to business process requirements implementation. Let us assume that we have any data table probably in the custom namespace, just to simplify the demo case and get focused on OData service only, and not on SAP functional modules and class usage.

Let us assume that we have any data table probably in custom namespace, just to simplify demo case and get focused on OData service only, and not on SAP functional modules and class usage. Please consider that in this case there is no OData annotation in use. Let us assume that we have any data table probably in custom namespace, just to simplify the demo case and get focused on OData service only, and not on SAP functional modules and class usage.

If you are using complex CDS with associations for Master-Details view, for example you should additionally create Associations and Navigation Properties. This section will be added. Nice Blog. There is one more way, where you can directly bind the CDS view to the entity. So we dont need to write the code to fetch the data. SADL layer will fetch the data for us with top, skip, filters. In the service implementation, right click on the entity and map to data source, here map the same to CDS view.

Hello, Mahesh kumar palavalli. You can even map a database table or view. I try to call method to include more data in entity while GET request is initiated for the entity. If the service is not generated from the CDS view then yes it is possible as you will be doing it via the reference odata source or entity set binding to individual cds view.

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Yes I do. You confirmed something I only could guess about. Thank you very much for your valuable response! Is it possible to access data from a database table of another system in this method?