Download Completed Project. In this tutorial, I'll walk through creating a client application that calls an OData service. The OData service exposes the following entities:. You don't need to read them to understand this tutorial, however.
The first step is to generate a service proxy. The service proxy is a. NET class that defines methods for accessing the OData service.
The proxy translates method calls into HTTP requests. Start by opening the OData service project in Visual Studio. Note the local address, including the port number that Visual Studio assigns. You will need this address when you create the proxy.
Next, open another instance of Visual Studio and create a console application project. The console application will be our OData client application. You can also add the project to the same solution as the service.
Create ODATA service and implement CRUD methods using ABAP 7.4
For Namespacetype "ProductService". This option defines the namespace of the proxy class. Click Go. Visual Studio reads the OData metadata document to discover the entities in the service.
Again, use the actual port number where your service is running. When you deploy your service, you will use the URI of the live service.It supports following Visual Studio:. For full documentation, please refere to " How to use OData client generator to generate client proxy file ". The following part will mainly focus on how to use the OData Connected Service by Microsoft to generate client proxy file. See How To. You can install this extension by this link from vs gallery. Or, you can install it in Visual Studio In the Configure endpoint dialog, input the service name and the OData service endpoint, then click Next button.
In the Settings dialog, enter the file name without extension of the proxy file and click Finish. In the Settings dialog, You also can configure some other settings by click AdvancedSettings link. Then you can set the related code generation settings. Once you finished all those settings, click Finish. This tool will begin to install the related NuGet packages and generate the client proxy file into your project.
Skip to main content. Exit focus mode. Click Download. Click Close once the installation finishes. You need to restart the visual studio in order for the installation to take effect. Generate Client Proxy Create a new project Create your project.
Here, we take "Console Application" project as an example. GetValue ; Console. WriteLine me. Related Articles Is this page helpful? Yes No. Any additional feedback? Skip Submit. Is this page helpful?OData provides a uniform way to query and manipulate data sets through CRUD operations create, read, update, and delete.
You can even have a v4 endpoint that runs side-by-side with a v3 endpoint. NET Web Application. NET Framework template. Name the project "ProductService". Select the Empty template. Select OK.
OData service development options
In the Package Manager Console window, type:. In Solution Explorer, right-click the Models folder. By convention, model classes are placed in the Models folder, but you don't have to follow this convention in your own projects. Name the class Product. In the Product. The Id property is the entity key.
Clients can query entities by key. The Id property will also be the primary key in the back-end database. Use any data-access layer that can translate database entities into models. First, install the NuGet package for EF. Open the Web. This setting adds a connection string for a LocalDB database. This database will be used when you run the app locally.
An EDM is an abstract model of the data. The EDM is used to create the service metadata document. This approach requires the least code.
If your application has multiple OData endpoints, create a separate route for each. Give each route a unique route name and prefix. A controller is a class that handles HTTP requests.
You create a separate controller for each entity set in your OData service. In this tutorial, you will create one controller, for the Product entity. Name the class ProductsController. The version of this tutorial for OData v3 uses the Add Controller scaffolding.
Currently, there is no scaffolding for OData v4. The controller uses the ProductsContext class to access the database using EF.However, in a few cases, some SharePoint objects include properties that are very resource intensive to retrieve; to optimize REST service performance, these properties are not included in the default query, and must be explicitly requested. For example, the SPWeb. You can also specify that the request returns projected fields from other lists and the values of lookups.
Calling an OData Service From a .NET Client (C#)
For example:. Single value lookup fields are represented by two separate fields in the SharePoint REST service: one field representing the actual field value, and another representing the field name. You can execute queries against the lookup field value as you would any other field of that data type. For example, if the lookup field value is a string, you can use string comparison options in your query.
Therefore, you must construct user queries against users' friendly names. Membership-based user queries are not supported. Usage of the Current operator to do queries using the ID of the current user isn't supported. Because multi-value lookup fields are returned as a string of multiple values, there's no way to query for them for example, the equivalent of an Includes element or NotIncludes element isn't supported.
To sort by multiple fields, specify a comma-separated list of fields. You can also specify whether to sort the items in ascending or descending order by appending the asc or desc keyword to your query.
For example, the following URI requests that only the first 10 items in the prospective return set actually be returned:. When using these query options, take into account that paging in OData is ordinal. For example, suppose you are implementing a next page button to display SharePoint list items. You use the REST service to enable the button to return items 1 through 20 when clicked, and then items 21 through 40, and so on. However, suppose another user deletes items 4 and 18 between clicks of the next button.
In such a case, the ordinal positioning of the remaining items is reset, and displaying items 21 through 40 actually skips over two items.
You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Note Membership-based user queries are not supported. Note When using these query options, take into account that paging in OData is ordinal. Is this page helpful? Yes No. Any additional feedback? Skip Submit. Send feedback about This product This page. This page.
Submit feedback. There are no open issues. View on GitHub.
Client code gen tool
Arithmetic operators add, sub, mul, div, mod Basic math functions round, floor, ceiling.Here it is important to know that using the new programming model it is perfectly fine to stick to the OData V2 protocol which is supported endend out of the box and wait for the upcoming OData V4 support since the service implementation is already protocol agnostic in general and agnostic to the OData version in particular.
The first OData service implementations used the Service Builder to design the OData Model and a code based implementation of the methods of the data provider extension class. With the planned endend support of the OData V4 protocol by the new ABAP progamming model we expect that code based implementation of the OData protocol specifics in the OData provider class becomes the exception.
This is because the BO implementation and CDS implementation are both OData protocol agnostic and do not require any deep knowledge of any version of the OData protocol. The following two blogs provide comprehensive how-to guides for the implementation of such a service.
By implementing the create, update and delete methods it is for example possible to call a BAPI to update a business object such as a sales order as described in my following two blogs. By simply adding the annotation OData. Beside the option to use a code based implementation it is planned to offer also support by the new ABAP programming model. OData V4 code based implementation — Overview. OData V4 code based implementation I basic interface, read access. Yes, and I will publish a how to guide how to implement the same very soon.
See my following blog that I will update accordingly. Thanks Andre for writing this very comprehensive reference. One to bookmark! Do you know when UI5 will offer full support for v4? Please find the attached metadata screen shot. Hi andre. When I tested the above have been getting an error saying entity not found where the name of the entity on the error provided is same as the mapped CDS name.
Very helpful blog. Are you able to show me the documentation around this or an example of this implementation. I assume this means my system is not up-to-date to perform this.
On top of that different deployment options are possible.
I see how much less effort it is if I compare to my manual implementation of sorting, paging and filtering from before. Following the recommendations, CDS views are the way to go. I would be great to see SAP providing completely implemented BOPF model at least for the most common standard objects like business partnerso they can be mapped directly to OData service.An attempt to show how we can reduce code lines using ABAP 7.
In the next screen enter below inputs to create Soheaderdata entitytype and SoheaderdataSet entityset. Specify association name, principal entity type name, dependent entity type name, Cardinality and Navigation Property in below window. Specify referential constraints between Soheaderdata and Soitemdata and specify key relation in below window. Now create association and navigation property between Soitemdata and ProductHeaderdata similar way.
In the next steps, we will implement data provider class methods to retrieve data. In service implementation folder, for SoheaderdataSet entity set, we will implement method for GetEntitySet Query to retrieve all sales orders header data. Get Filter and orderby URI parameter values. Filter or selection URI parameters can retrieved using below method. We can use below URL:. In the above code using sales order number and item number, getting corresponding product number. However, for the scenario stated above, it would never have a product and we should deduce the product from the information specified in the navigation path.
Former Member. Posted on March 8, 10 minute read. Follow RSS feed Like. Press Finish button to create entitytype and entityset. And Then save project. Finish setup in next window to create association and navigation property Now create association and navigation property between Soitemdata and ProductHeaderdata similar way.Introduction to OData
This book deals with common OData programming cases over the Microsoft. NET Framework platform and eases the learning curve for a. NET developer to start incorporating OData in data service development. This book provides a collection of recipes that help.
NET developers to get familiar with OData programming in a quick and efficient manner. In addition, all the sample cases here are based on real-world scenarios and issues that. NET developers might come across when programming with OData in application development. This book will be your handy guide with basic to advanced walkthroughs of common OData programming cases for the Microsoft.
NET Framework platform. You will learn quick solutions to necessary tasks to integrate the power of OData at both server-side and client-side. This book will help you master the use of OData with. NET Framework by taking you through hands-on and practical recipes. It starts by talking about the common means for building OData services and consuming OData services in client applications.
Then, some more specific topics like hosting, configuration and security are discussed. The book also covers many popular and interesting topics such as integrating OData in web applications, and developing data-driven mobile applications with OData. Moreover, you can also find quite a few recipes discussing real-world OData producers and new features in latest and future versions.
Within "OData Programming Cookbook for. NET Developers", all the recipes are selected based on real-world scenarios that you will commonly come across.
Each recipe covers a specific topic, going from the description of the problem, through a conceptual solution, to a solution containing sample code.