By Jeffrey P. McManus
Database entry with visible uncomplicated .NET keeps to exploit options constructed by means of Jeffrey McManus that offer options to difficulties confronted via builders on a daily basis. when you consider that information entry is the main used characteristic in company improvement, it is vital for builders to appreciate the best and effective solution to entry facts utilizing .NET applied sciences. This ebook presents transparent reasons of the way to exploit ADO.NET to entry info saved in relational databases, in addition to how XML integrates with ADO.NET. The authors use their years of expertise to narrate key subject matters to real-world functions via use of commercial circumstances that come with code listings in visible easy .NET.
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So, in addition to telling the database engine to return all the fields in the record source, you also have the ability to specify exactly which fields you want to retrieve. This limiting effect can improve the efficiency of a query, particularly in large tables with many fields, because you're retrieving only the fields you need. A SELECT clause that retrieves only the contents of the first and last names stored in a table looks like this: SELECT FirstName, LastName Note also that a SELECT clause isn't complete without a FROM clause (so the SELECT clauses shown in this section can't stand on their own).
Creating a Data Browser Application The preceding demonstration shows the easiest type of data binding retrieving an entire table and displaying it in a DataGrid control. But what about displaying data one record at a time? To do that, you'll have to use a combination of TextBox controls, Button controls, and code. To create a data browser application to view records in the customer table one record at a time, do the following. 1. Create a new Windows Forms project. On Form1, create two text boxes.
14. Creating a data binding between a database field and a text box by using the text box's DataBindings property 34 35 5. Bind the text box txtLastName to the database field LastName the same way you bound txtFirstName. 6. Run the application. The first and last name of the first customer should appear. This application is limited at this point, you can view only a single record, and once again, you can't change data or create new customer records. But this application is a good start. We build on it in the next few demonstrations, adding capabilities that transform the simple data browser into a real database application with the ability to manipulate data.
Database Access with Visual Basic .NET by Jeffrey P. McManus