Updating database from datagrid sherry cho dating
The user will see a warning message box letting him/her know that the record is about to be inserted, if the user decides not to insert the record, the grid is simply refreshed by reloading the data with dg Emp. Remove(employee); in order to delete the rows from the database.
Items Source = Get Employee List(); DELETE records by pressing Delete Key: When the user selects one or various rows and presses the DELETE key, the Preview Key Down is fired and the rows disappear; however, the delete action does not update the database but only the collection. It is important to mention that the program needs to know that the user is deleting a row, not only a cell content; hence, just like in the insert operation, I used a Boolean value is Being Edited which is set to false unless the user is deleting the whole row.
The Data Grid View can display data in Bound mode, unbound mode and Virtual mode .
Bound mode is suitable for managing data using automatic interaction with the data store.
The way the architecture works with the Data Adapter is that you can make any changes you want to the filled Data Set, and it won't affect the database until you call the Update method.
When Update is called, the Data Adapter will attempt to execute each query (UPDATE, INSERT, DELETE) on every row of the Data Set that has been updated, inserted, and deleted.
FYI: I’m using North Wind Database Employees table, VS 2012, . Create a new WPF project; you may call it “Wpf Data Grid Update Insert Delete” 2. NET Entity Data Model” to the project, select “Generate from Database” and select “North Wind.dbo” as your Data Connection. Besides adding the above code to the xaml, you need to save the observable collection back to the context, hence, make sure that once the user has move to the next or prior row, the context is saved by adding: context.
The Add New method of the Data Table adds a row to a Data Table.
Because a majority of Web applications involve reading data and not updating it, one-way data binding keeps the size and complexity of the page architecture to a minimum for the most common scenarios.
However, there are times when you do want to update data. If you are using a dataset, you can write changes to the dataset and then call the data adapter to send changes from the dataset to the database.
For the walkthrough, you will work with the Categories table of the SQL Server Northwind database. Event Args e) Finally, you want to add code that will update the database with changes from the record displayed in the page.
In the page, you can select a record, edit it, and then save it to the database. As with fetching a single record, the update requires that you set some parameters and then execute a statement (in this case, an Update statement).