Netweaver Gateway

I’m finally getting back to the Netweaver Gateway stuff.  This piece is the most powerful, and also the most complicated.  I struggled with this for a while, so it’s a good idea for me to explain it and make sure I don’t forget myself 🙂  I’m going to focus on the query implementation, but all of the options work the same way.

Open up the Service Implementation folder, then open the entity set you wish to map.

Create – Use this to create a new entry.
Delete – Use this to delete an entry
GetEntitySet(read) – use this to read back a single entry
GetEntitySet(query) – use this to read back an entire table.
Update – use this to update an existing entry.

Now, one of the things I’ve found is that for most of these entries, it really all does depend on your RFC that is being called.  For example, you could likely call Create or Update using the same RFC and it would work, as long as your RFC code was properly defined.

Now this screen shows you a completed mapping for the query operation.  Depending on your RFC and how you defined things previously, you can use the Propose Mapping button to fill in all of the fields for you.  Or, you can drag and drop from the right hand window.  Now, one of the things that I originally had issues with supplying the inputs for my RFC.  What I discovered, is that in Netweaver Gateway, you can have the same parameter show up multiple times, once as an input and once as an output.  All you need to do is point it to the correct field.  If you look above at the OrderNumber field, you’ll notice that it’s listed twice, once with an arrow pointing left (output) and one with an arrow pointing right (input).  If you look in the mapping field, you’ll notice that the input and output point to different fields.

Like everything, you must know your RFC to do this correctly.  Then, if you need to use the same field again, you must use the insert, select the field from the list, press the arrow until it points to the right, and finally select the mapping field from the RFC that should be the import.

At this point, if you have the gateway configured, you are ready to test and connect it to your mobile app 🙂

Thanks for reading,

In the last post, we created the entity for our service.  One of the next pieces is the entityset.  This is a really easy piece, but still required in order to complete the service.  We go back to SEGW.

next…

Name your entityset, and pick the entity you want to link to…  Now you’re ready for the next step…  we’ll get there in a future post.

Thanks for reading,

Well, picking up where we left off on Netweaver Gateway.  Last time we created the project, now it’s time to actually create the service.  In my example, I have already created an RFC to feed the information I need to the service.  So, here’s how to do it.  Return to transaction SEGW.

next…

Here, you need to give it an entity name.  This is what you’ll be using going forward.  Select the type as Remote function call, and then list the name of the function.

Now we get to the magic.  The RFC has now pulled in all the inputs and outputs from the function.  Now, you check the fields you want to make part of your “entity”.  The entity will contain the fields that you plan to extract or feed into your service.

After you select the fields you want, you must define at least one key.

Now, you have the entity.  With this piece, you’re ready to start doing something with the data.

In a future post, I’ll talk about the next steps for the service.

Thanks for reading,

Well, since I recently spoke about using the gateway client, I figured I should talk about creating the service to use the gateway client.  The first step in this process is creating the project.  Like so many things, you must start small in order to build…  so let’s the netweaver gateway project and get this party started.

First, go to transaction SEGW

Press Create.

Now, put in the project name, description and package.  For me, I do everything within my own namespace, so notice how both the project and the package must start with the namespace.  Press the green check and you have your project.

In future posts, I’ll walk you through the next steps.

Thanks for reading,