By Steven Holzner, Bob Howell
Written for builders who have to wake up to hurry on ADO.NET, this e-book covers the ADO.NET item version from begin to end, from database instruments to making facts gadgets, from developing net providers to constructing multi-tier database functions. It additionally covers every little thing from home windows kinds periods and knowledge binding to making ASP.NET internet functions. greater than a reference ebook, the authors mix own event and top practices with useful how-to wisdom. not like another books, this booklet was once written utilizing the professional liberate of visible Studio.NET specialist, so all examples and code are totally modern.
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You may also want to create a shortcut so that the command prompt starts up in the Visual Studio Project folder so you can easily navigate to the folder your executable is in. Once the command prompt is started, navigate to the folder your program is in. By default, Visual Studio creates the executable in a bin subfolder under your project folder. On my machine the path is: C:\Documents and Settings\bhowell\My Documents\Visual Studio Projects\ADOBook\ADOBook03\ADOBook03-01\bin Once you have found the folder, type the name of our little program, ADOBook03-01 and press enter.
By definition, it cannot have any meaning beyond this. You can define identity columns that automatically assign the next incremental value when a new row is inserted into the table. The Identity attribute tells SQL Server that you wish this column to be an identity column. Identity seed is the number you wish SQL Server to start numbering with. Increment is how much you wish SQL Server to add to the previous value when inserting a row. You may only have one identity column per table. • IsRowGUID This attribute is active on columns that are defined as Unique-Identifiers.
The lower part of the screen contains attributes of each column beyond the basic data type: • Description You may enter a description of the column. It is advisable to use this attribute because it will help when documenting the schema. Put descriptions in when you create the columns; if you have to go back and fill them in, you may find the task daunting. • Default value The "default" default value of any column is Null. If you have defined the column as allowing nulls, this is okay. If you have defined the column as not allowing nulls, it is always a good idea to define a default value so you can insert rows without remembering which columns don't allow Chapter 3.
ADO.NET Programming in Visual Basic .NET by Steven Holzner, Bob Howell