Download e-book for iPad: Serious ADO: Universal Data Access with Visual Basic by Robert MacDonald

By Robert MacDonald

ISBN-10: 1430208627

ISBN-13: 9781430208624

ISBN-10: 1893115194

ISBN-13: 9781893115194

From pro developer and coach Rob Macdonald comes Serious ADO: common information entry with visible Basic, which teaches skilled visible uncomplicated builders find out how to utilize ADO, Microsoft's flagship product for database entry. Serious ADO covers the whole diversity of makes use of for ADO, from simple use of the ADO know-how to really good themes and complex suggestions that might profit even the main skilled developers.

The first a part of the ebook presents thorough insurance of ADO's parts and what they could do. alongside the way in which, Macdonald deals real-world code examples besides whole motives of precisely what's taking place at each one degree of the advance procedure. This half additionally covers many of the key suggestions upon which ADO programming is predicated, corresponding to locking and transactions, connection pooling, marshalling, and Inter strategy communique, between others.

The moment a part of the booklet addresses using ADO in real-world improvement eventualities. the following, Macdonald demonstrates complex consumer interface construction, together with new how you can keep watch over the binding approach. you are going to additionally how to use Microsoft Transaction Server of COM+ functions to create transactional component-based systems.

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I routinely use this technique, for example, when I want to identify those records in one Recordset with a foreign key that matches the primary key of a record in another Recordset. This works even when the key is a compound one because I can create a compound And statement using Filter. If, like me, you end up with a set of standard Filter-based functions, remember that it's considered polite to return a Recordset as you found it. This means making sure the Filter and current record are reset.

Understanding the state model of a modification operation gives you a high degree of control over what happens during Updates, AddNews, and Deletes. This is a topic that will receive much greater attention later. ADO Data Types and Attributes We've played quite a bit with the data in a Recordset without worrying too much about what sort of data it is. Field objects and the data they provide access to can behave quite differently depending on the nature of the 41 Chapter2 data within. It's not only the standard notion of data types (such as Char, Integer, or Double) that accounts for these differences.

The difference between the two modes is very important when working with a data source. Chapter 3 will deal with Immediate mode updating when using an SQL data source, and Chapter 6 will deal with Batch mode. It so happens that when you create a fabricated Recordset, its default mode of operation is Batch. For the purpose of this section we want to work in Immediate mode, so we'll use a fimction called getPartslmmediate that creates the same data as getParts, but overrides the default behavior of a fabricated Recordset to use a LockType that provides Immediate mode updating.

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Serious ADO: Universal Data Access with Visual Basic by Robert MacDonald

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