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What I’ve tried to-do with the below set of tutorials is provide an end-to-end, step-by-step, walkthrough that covers all of the core concepts involved in creating and consuming a DAL built with the data designer. NET 2.0 together, you should be able to create a core DAL implementation and build from scratch a data-driven UI web app on top of an existing database very quickly (~10-15 minutes to build an application from scratch that supports master/details filtering along with data paging, sorting, insertion, and editing).
SQL Express databases within the App_Data directory will automatically show-up as a listed item in the Server Explorer property window (note: I sometimes get a timeout error the very first time I expand a newly copied sql express database here – I think because it is generating the log file the first time it is accessed.
The above dialog shows the default settings that are set when you run the “Create Table Adapter” wizard from within a VS 2005 Web Site Project (these are the most common data patterns we typically see developer’s use with stateless web applications).
For the purposes of this DAL walkthrough, we want to turn off optimistic concurrency (note: one of my later blog postings on optimistic concurrency will change that setting – but I will be showing straight updates first).
There are two patterns of data usage that this data wizard can generate – one is the “Fill” pattern used with Data Sets, that will generate a method that accepts a Data Set or Data Table parameter that we want to add category information to.
What I now have is a strongly-typed Data Adapter class (by default named “Northwind Table Adapters. NET code, construct a SQL query, or manage connections at all in the above code – all of that is encapsulated by the Suppliers Data Table and Suppliers Table Adapter that we now have in our then looking at the property-grid (note: you must select the Suppliers Table Adapter heading to have these methods show up in the property grid – they won’t show up if you just select the Suppliers heading): For example, if I wanted to add a custom Insert method that had the additional behavior of returning the new identity column value of a newly created Supplier row (which has an auto-increment property set for the primary key), I could do so by right-clicking on the Suppliers Table Adapter and choosing “New Query”: Because the data designer generates typed methods and Data Tables, I’ll get both intellisense/compilation-checking as well as type validation within my DAL (so for example: if I try to pass an integer instead of a Date Time it would give me a compile error).
Suppliers Table Adapter”) with a “Get All Suppliers” method that I can use to execute a SQL query and obtain back a strongly-typed Data Table results class (by default named “Northwind. Using the above knowledge, you should be able to go off and quickly create the following strongly-typed Table Adapters with associated data methods pretty easily (note that the designer and query builder can be used to avoid having to manually write any of the SQL queries below – and it will auto-suggest subsequent queries for each adapter after you add the first one).
Specifically, there in addition to retrieving the Products table columns I’m also retrieving the Company Name from the Suppliers table that maps to the Product’s Supplier Id column (it has a foreign key relationship to the Suppliers table).
This will allow me to be more efficient from a database perspective when I want to build a list UI on top of my Products table, and save me from having to hit the database an extra time per-row to retrieve this value when displaying a product list on the site.
One of my goals over the next few weeks is to publish a number of quick tutorial postings that walkthrough implementing common data binding design patterns using ASP.
NET 2.0 (master details, filtering, sorting, paging, 2-way data-binding, editing, insertion, deletion, hierarchical data browsing, hierarchical drill-down, optimistic concurrency, etc, etc).
To help keep these samples shorter, and to help link them together, I’m going to use a common DAL (data access layer) implementation across the samples that is based on SQL Server’s Northwind sample database.
I really like the fact that it enables me to avoid having to write tedious data access code, while still preserving full control over my SQL data logic (I also like the fact that it enables me to use both standard SQL statements as well as SPROCs).Tags: Adult Dating, affair dating, sex dating