Updating typed datasets
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).
If you misspell the table name, for example, the compiler will not catch the error, but at runtime your program will fail.
dating in blooming prairie mn - Updating typed datasets
The good news is that you can still define these manually within the designer (just click on the table-adapter, and then within its property grid choose to create a new “Insert” (or update or delete) command and define your own logic).
When I hit save on the file (where all of the adapters, definitions and relations are declaratively stored in an XML file), I’ll be able to program and data-bind against any of the objects defined within it.
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.
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.
The good news is that the data designer can still infer enough from the product adapter’s SQL statements to still automatically generate the correct INSERT, UPDATE and DELETE commands for the Products Table Adapter.In good object-oriented design, the data and the methods used on the data should be encapsulated. NET 1.0 and 1.1, users had to pass the dataset to business components to perform certain functions.There are a few limitations to this strategy, since the data and the methods that work on the data are not encapsulated as a single, logical unit.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).NET platform and a basic understanding of the dataset model.