By Jason T. Roff

ISBN-10: 1565924150

ISBN-13: 9781565924154

This ebook is a one-stop advisor to ADO, the common information entry answer from Microsoft that permits quick access to info from a number of codecs and systems. It comprises chapters at the Connection, Recordset, box, and Command gadgets and the houses assortment; ADO structure, information shaping, and the ADO occasion version; short introductions to RDS, ADO.NET, and SQL; and a finished alphabetic connection with each ADO item, process, estate, and occasion.

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Additional info for ADO ActiveX data objects

Sample text

2 Creating ActiveX Data Objects In Visual Basic, you can create new ADO objects by simply referencing the ADODB classes of the Microsoft ActiveX Data Objects Library. Recordset In the previous examples, the ADODB prefix to the ADO objects is used in case your Visual Basic development environment references another object of the same class name in a different class library. The following code illustrates how a DAO Recordset and an ADO Recordset can be created within the same project: ' which object model is this from?

A cursor is a way of working within a result set or records. Each provides a different view of the same data, and each has its pros and cons. Not all providers support every type of cursor. The four types of cursors are: Forward-only cursor The forward-only cursor is exactly the same as the static cursor except that you can only move forward through the records in your recordset. Unless you specify otherwise, this is the default view of a recordset, and it offers the best performance of all four recordset types.

The Command object's object model Once you're connected to a data source, you naturally want to perform some operation on it. One of your options is to use the Command object, which executes commands against the associated data source. There are five types of commands that a Command object can execute: A SQL statement Probably the most popular type of command, a SQL statement can gather information, manipulate information, or manipulate the structure of the underlying database. A parameterized query (a query with input and output parameters) A parameterized query uses variables that set or return values that are part of a particular query or SQL statement.

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ADO ActiveX data objects by Jason T. Roff


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