Asp net query tool

Could not load branches. Could not load tags. Latest commit. Git stats 7 commits. Failed to load latest commit information. View code. Overview In this example, an authenticated user can use the Query Builder to create a new data source and save it in the database.

Impementation Details Authentication and Storage The application requires authentication so that the data sources and reports are available only to the user who created them. Files to look at: ReportStorageService.

File to look at: CustomConnectionProvider. Add third-party dependencies. The bundleconfig. The Startup. Bind Model. 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 actual delete operation is performed using the following code, which first confirms that this is a post operation and that the ID isn't empty:. The code runs a SQL statement that deletes the specified record and then redirects the user back to the listing page. Click the Delete link for one of the products.

The DeleteProduct. Click the Delete button. The product record is deleted and the page is refreshed with an updated product listing. You can connect to a database in two ways. The first is to use the Database. Open method and to specify the name of the database file less the. The Open method assumes that the. This folder is designed specifically for holding data. For example, it has appropriate permissions to allow the website to read and write data, and as a security measure, WebMatrix does not allow access to files from this folder.

The second way is to use a connection string. A connection string contains information about how to connect to a database. This can include a file path, or it can include the name of a SQL Server database on a local or remote server, along with a user name and password to connect to that server.

If you keep data in a centrally managed version of SQL Server, such as on a hosting provider's site, you always use a connection string to specify the database connection information. As the name implies, you can use a Web.

An example of a connection string in a Web. In the example, the connection string points to a database in an instance of SQL Server that's running on a server somewhere as opposed to a local.

You would need to substitute the appropriate names for myServer and myDatabase , and specify SQL Server login values for username and password. The username and password values are not necessarily the same as your Windows credentials or as the values that your hosting provider has given you for logging in to their servers. Check with the administrator for the exact values you need.

Open method is flexible, because it lets you pass either the name of a database. The following example shows how to connect to the database using the connection string illustrated in the previous example:. As noted, the Database. Open method lets you pass either a database name or a connection string, and it'll figure out which to use. This is very useful when you deploy publish your website. You can use an. Then when you move your site to a production server, you can use a connection string in the Web.

Finally, if you want to work directly with a connection string, you can call the Database. OpenConnectionString method and pass it the actual connection string instead of just the name of one in the Web. This might be useful in situations where for some reason you don't have access to the connection string or values in it, such as the.

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