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Download e-book for kindle: Database Access with Visual Basic .NET by Jeffrey P. McManus

By Jeffrey P. McManus

ISBN-10: 0672323435

ISBN-13: 9780672323430

Database entry with visible easy .NET maintains to take advantage of innovations built by means of Jeffrey McManus that supply ideas to difficulties confronted via builders each day. considering that info entry is the main used characteristic in company improvement, it is necessary for builders to appreciate the simplest and effective strategy to entry info utilizing .NET applied sciences. This ebook offers transparent motives of ways to exploit ADO.NET to entry facts saved in relational databases, in addition to how XML integrates with ADO.NET. The authors use their years of expertise to narrate key themes to real-world purposes via use of industrial circumstances that come with code listings in visible uncomplicated .NET.

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Some developers prefer to use IN when applying multiple criteria because it makes for a somewhat tidier SQL statement. [ Team LiB ] [ Team LiB ] 50 51 Sorting Results with ORDER BY The ORDER BY clause tells the database engine to sort the records it retrieves. You can sort on any field, or on multiple fields, and you can sort in ascending or descending order. To specify a sort order, include the ORDER BY clause at the end of any SELECT query, followed by the name of the field or fields by which you want to sort.

Fortunately, SQL Server has a ROUND function that enables you to do so easily. The most commonly used form of ROUND takes two parameters, a decimal value and an integer that specifies how many digits to the right of the decimal you want. tblInventory produces the following result. [ Team LiB ] [ Team LiB ] Aliasing Field Names with AS SQL gives you the ability to alias, or rename, a field or expression in a query. ) You typically need to alias a field for two reasons: 1. The underlying table has field names that are unwieldy, and you want to make the field names in the result set easier to deal with 2.

For example, the ability of a data control to connect to a database is now handled by the SqlConnection object. The data control's ability to retrieve, update, and delete records is managed by the BindingContext object in conjunction with the DataAdapter object. Navigating from one object to the next is the responsibility of the BindingContext object, and so on. Unlike the old data controls, none of these objects have any visual representation at run time, which works to your advantage, enabling you to build whichever kind of data-driven user interface you want.

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Database Access with Visual Basic .NET by Jeffrey P. McManus

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