In the previous post we finished the runtime side of the SSIS task. It’s time to work on the design side. The design consists of a standard Winforms form and controls. If you already know Winforms then you are halfway there. If not then you should read up on it first.
In the last article we set up some infrastructure for creating tasks. We then implemented the shell of the task to generate SSRS reports. In this article we are going to finish up the runtime side of the SSRS task. To do that we need to talk about task parameters, persisting the parameters, getting access to connections at runtime and how to work with variables at runtime.
In the first part of this series we generated an SSRS report using an SSIS script task. In the second part we created a custom task to display “Hello World”. In this article we will combine the work to create a custom task to generate an SSRS report. For this post we will simply get the runtime side of the task working. Design time support will be added in a later article.
In the last article we created a simple SSIS package to generate an SSRS report and save it to disk. For a single report this is fine as it didn’t require a lot of code but imagine if we wanted to write new packages and reuse this code. This is where script tasks break down. Each script task is a standalone block of code, basically its own .NET project. Code in one script task has no access to any other script, even in the same package. The only way to share code is copy/paste. This is error prone and unmaintainable.
One way to work around this is to create code outside the script task and copy paste the source files into each script task. This works but can be difficult to maintain over time. The ideal solution is to move this code into its own assembly and then reference the assembly in each script. Unfortunately SSIS requires that all script references be in the GAC. This complicates deployment as we’ll see later but is doable.
This is where SSIS custom tasks become useful. When you want to use the same script task in several different places or packages then it is time to promote it to a custom task. This provides several benefits.
- Code duplication is eliminated.
- The need for a script task goes away and is replaced by a reusable task.
- A custom task is easier to use in packages then script tasks.
- The custom task can access functionality that is difficult or impossible to do inside a script task.
For this article we will replace the existing script task to generate SSRS reports with a custom task. Creating the task and building the UI is straightforward once you get past the initial learning curve. Surprisingly though working with Winforms proves to be the most challenging aspect of the process. Before continuing be sure that everything is setup as discussed in the previous article.
A while back I posted an article on how to extend the existing help pages generated by Visual Studio for Web API projects to use reflection instead of XML documentation. One of the limitations of that approach was that you could not test the APIs directly. You had to use SoapUI or equivalent. Since then I have started using Swagger for documentation. As a documentation/testing tool it fills the need. In this article I will demonstrate how to integrate Swagger into a Web API project. Additionally I will continue to use the reflection provider from the previous article.
Recently I had the need to create a couple of custom tasks for SQL Server Integration Services (SSIS) at work and I was shocked at how few the resources were for doing this. There are a lot of blogs and articles about creating SSIS custom tasks, but most of them are outdated or wrong. Even Microsoft’s own documentation has clearly been promoted from older versions and is no longer accurate. This leads to a lot of wasted time and scratching of your head trying to figure out what is wrong.
In this series of articles I’m going to demonstrate how to create a custom task for SSIS 2014. This information is also applicable to SSIS 2012 but doesn’t necessarily work with earlier or later versions of SSIS. In this first article we will set up a simple SSIS package that we can use for the remainder of the series.
Prerequisite: This post assumes you understand what web APIs are, what they are designed for and how to write them. If not then take a look at this MSDN article first.
In order for web APIs to be useful they need documentation. Unlike traditional APIs there is no function signatures to look at. Even if you know the name of the “function” there is no easy way to get the parameters or return value. Hence documentation is important to anyone wanting to use such an API. If you are writing a REST API then the documentation is technically where the HATEOAS concept comes in. The reality is, for now at least, most people write web APIs using the REST API philosophy but without HATEOAS. Hence documentation is still needed.
The biggest issue with documentation is keeping it in sync with the code. We have XML doc tags for .NET languages and can use them with web API. But to be useful we have to ensure the documentation is refreshed whenever the API changes. ASP.NET solves this problem by relying on the existing XML doc tags that you’re likely already using. At runtime the documentation is rendered on demand based upon the existing comments. This is one approach to solving the problem. In this article I will take a look at the “built in” functionality, identify when it might not be useful to you and provide an alternative approach that I use.
WebHooks are a relatively new concept in ASP.NET but they have been around for a while with other platforms. GitHub, PayPal and even Dropbox support them already. If you are unfamiliar with the concept of a webHook then go read the introduction first. Recently I needed to solve a problem for which WebHooks seemed like a possible solution. This is my journey through that decision process.
When Office 2016 was released the other day I was both surprised and excited. Office 2013 has been around a while and I knew Office 2016 was in development but there was no pre-release warning, it just appeared. In the continual need to always be using the latest stuff I uninstalled Office 2013 and installed 2016. Then the problems began.
A while back I posted a series of articles on how to use T4 and a custom VS extension to simplify some common code like application settings, WCF clients and environmental transforms. With the release of Visual Studio 2015 I had to update my own extension and templates so I wanted to posted a follow up article on the changes that need to be made to allow the extension to work with Visual Studio 2015. As part of the update I added some functionality to the app settings template. Before continuing be sure to download the previous version of the series (or simply download the final version below).