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This article is one in a series of articles on ASP. NET 1.x, you'd need to write code to: While only five to ten lines of code is needed to perform these four steps, and libraries like the Data Access Application Block help reduce the volume of code that you need to write, the fact remains that in order to access or modify data in an ASP. In this article we'll be examining how to access data from databases with the Sql Data Source and Access Data Source controls. The Data Source controls are a collection of Web controls designed to provide a declarative approach to accessing and modifying data.This will launch a graphical tool that lets you select what tables to query and automatically adds the statement - either by selecting a table or view or by picking a stored procedure or writing a custom SQL statement, click the Next button to reach the final screen. NET 2.0 I was firmly in the camp "doing things by hand." I didn't like wizards, I felt that they abstracted away too much and were too often used as a crutch and enabled developers to be able to achieve some goal without really learning what it was they just did.Here you can run the query you've configured against the database and observe the results. This fact often jumps up and bites the head of the wizard-using developer when something goes wrong.To specify a different ordering, click the ORDER BY button.Here you can choose what columns the data should be sorted by, and if it should be sorted in ascending or descending order.We'll see how to use these Data Source controls to modify database data in a future installment.Also, we'll focus on working with these Data Source controls in Visual Studio 2005 through the Design view.
The code to connect to the database, issue the command, and retrieve the results is handled internally by the Data Source control.
The selections here tack on an If you opt to select the columns to return from a table or view you can only configure simple queries that involve a single table or view.
With relational databases, often there's data in related tables that we need to grab, requiring s.
For this article I'm going to demonstrate connecting to, retrieving, and displaying data from the Microsoft Access Northwind database, which is included in the download.
(Note that I'm using a slightly modified, slimmed down version of Northwind, one whose Forms, Modules, Reports, and Macros have all been deleted to reduce the file size.) ASP. When using professional grade database systems, like Microsoft SQL Server, typically the database is registered on a separate database server. Next, drag a Sql Data Source control from the Toolbox onto the Designer.
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If not, you have to find each and every page that references the connection string and update it accordingly.