Data database windows net

Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? The first page displays products and lets users select one to change. The second page lets the users actually make the edits and save them. Important In a production website, you typically restrict who's allowed to make changes to the data. For information about how to set up membership and about ways to authorize users to perform tasks on the site, see Adding Security and Membership to an ASP.

The only difference between this page and the ListProducts. When you click this link, it takes you to the UpdateProducts. The href attribute specifies the page to display when the user clicks the link.

It also passes the Id value of the current row to the link. When the page runs, the page source might contain links like these:. When a user clicks one of these links, the resulting URL will look something like this:. Next, you'll create the page that lets users actually update the data. The update page includes validation to validate the data that the user enters. The body of the page contains an HTML form where a product is displayed and where users can edit it. To get the product to display, you use this SQL statement:.

This will select the product whose ID matches the value that's passed in the 0 parameter. Because Id is the primary key and therefore must be unique, only one product record can ever be selected this way. To get the ID value to pass to this Select statement, you can read the value that's passed to the page as part of the URL, using the following syntax:.

To actually fetch the product record, you use the QuerySingle method, which will return just one record:. The single row is returned into the row variable. You can get data out of each column and assign it to local variables like this:.

In the markup for the form, these values are displayed automatically in individual text boxes by using embedded code like the following:. That part of the code displays the product record to be updated. Once the record has been displayed, the user can edit individual columns.

When the user submits the form by clicking the Update button, the code in the if IsPost block runs. This gets the user's values from the Request object, stores the values in variables, and validates that each column has been filled in. If validation passes, the code creates the following SQL Update statement:. In a SQL Update statement, you specify each column to update and the value to set it to. In this code, the values are specified using the parameter placeholders 0 , 1 , 2 , and so on.

As noted earlier, for security, you should always pass values to a SQL statement by using parameters. When you call the db. Execute method, you pass the variables that contain the values in the order that corresponds to the parameters in the SQL statement:. After the Update statement has been executed, you call the following method in order to redirect the user back to the edit page:.

The effect is that the user sees an updated listing of the data in the database and can edit another product. Run the EditProducts.

The UpdateProducts. Make a change and click Update. The products list is shown again with your updated data. This section shows how to let users delete a product from the Product database table. The example consists of two pages. In the first page, users select a record to delete. The record to be deleted is then displayed in a second page that lets them confirm that they want to delete the record. For information about how to set up membership and about ways to authorize user to perform tasks on the site, see Adding Security and Membership to an ASP.

This page is similar to the EditProducts. However, instead of displaying an Edit link for each product, it displays a Delete link. The Delete link is created using the following embedded code in the markup:.

Replace the existing content with the following:. This page is called by ListProductsForDelete. To list the product to be deleted, you get the ID of the product to delete from the URL using the following code:. The page then asks the user to click a button to actually delete the record. This is an important security measure: when you perform sensitive operations in your website like updating or deleting data, these operations should always be done using a POST operation, not a GET operation.

By adding the confirmation and coding the page so that the deletion can be performed only by using a POST, you add a measure of security to your site. The content you requested has been removed. Ask a question.

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