Think of building a report in SQL Server Reporting Services (SSRS) like preparing a delicious meal. You wouldn't just throw ingredients into a pot, right? You need to know where your ingredients come from, what they are, and how they'll come together to create something wonderful. That's precisely where understanding 'report data' comes into play.
At its heart, report data is all about connecting to the sources where your information lives and then telling SSRS exactly what pieces of that information you want to use. Your organization likely has data scattered across various places – perhaps in robust relational databases, dynamic multidimensional cubes, or even lists on a SharePoint site. SSRS is designed to reach out and gather this data.
The first crucial step is establishing a data source. This is essentially the address and the key to your data's location. It includes all the necessary connection information – think of it as the recipe for how to find your ingredients. Importantly, the data source itself doesn't dictate which specific items you'll use, just how to get to the pantry.
Once you've got your data source set up, you then define a dataset. This is where you get specific. A dataset is like your shopping list, detailing the exact fields (columns) you want to pull from your data source. You'll often write a query here, which is a set of instructions telling the data source precisely what information to retrieve. It's the difference between saying 'I need vegetables' and 'I need two pounds of carrots and a head of broccoli.'
Now, imagine you have multiple reports that all need to access the same set of data – say, customer contact information. Instead of setting up that connection and query from scratch for every single report, you can create a shared data source. This is a fantastic way to keep things organized and consistent. It's like having a master ingredient list that multiple recipes can refer to. If the supplier changes or the address of the market shifts, you only need to update it in one place.
On the flip side, sometimes a report has very specific data needs that aren't relevant to any other report. In this case, you can create an embedded data source. This is like a special ingredient you've sourced just for one particular dish. It's defined right within the report itself and is used only by that report.
And what about the actual access? That's where credentials come in. These are your authentication details – your username and password, if you will – that allow you to actually get into the data source. SSRS handles these securely, so you don't have to embed sensitive information directly into your connection strings, which is a really good thing for security.
So, when you're designing your report, you'll see these data sources and datasets appear in a handy 'Report Data' pane. From there, you can drag and drop the fields you've selected into visual elements like tables, charts, or maps. When the report runs, SSRS uses your defined data sources and datasets to fetch the information, and then those visual elements display the results. It’s a structured, yet flexible, way to bring your data to life.
