generate barcode in vb.net Lesson 6: Creating Database Conventions in Visual C#

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Lesson 6: Creating Database Conventions
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while reading this and getting ready to disagree with everything that we write next.) So the naming conventions that should be implemented in your organization are the following:
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It doesn t matter what the naming conventions are. The important thing is that you have naming conventions and enforce them.
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Naming conventions
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It really doesn t matter what your actual naming conventions are. It does matter that you have naming standards that are enforced.
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After you finish all the arguments about naming conventions, the second topic that creates much heated debate in an organization is coding standards. The purpose of a coding standard is to provide structure to the way code is written, as well as specify how or if certain features and functions are used. For example, Thou shalt not use an outer join. Coding standards can be divided into two general categories: standardization and performance.
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The coding standards designed to introduce structure into the code that is written all fall into the category of standardization. Some examples of these standards are the following:
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Indentation is always done as four spaces instead of a tab character. Each subblock within a code block is indented four spaces from its parent. Transact-SQL keywords are all uppercase.
Each of these coding standards enables code to be more easily readable as well as have the same look and feel regardless of the developer writing the code. A good example of the use of indentation looks something like the following example:
CREATE PROCEDURE usp_myproc
DECLARE @myvar int,
@myvar2 varchar(25)
12
Designing the Physical Database
SET @myvar = 1
WHILE @myvar < 40
BEGIN
SELECT @myvar2 = column1 FROM mytable WHERE column2 = @myvar IF @myvar2 = SomeValue
BEGIN
EXEC usp_someotherproc @myvar2
SET @myvar = @myvar + 1
Performance
Coding standards dealing with performance are designed to restrict the application of certain features to ensure the best possible performance of applications. One of the more interesting coding standards that we have encountered was stated this way: Cursors are evil; they will not be allowed in production. Coding standards such as this example are counterproductive. If cursors were universally bad, they would have been removed from SQL Server. A better way of stating a coding standard such as this is the following: Cursors can cause severe performance degradation when used inappropriately. Before deploying code to production that contains a cursor, you must demonstrate that you have tested under realistic data volumes and the performance is better than a set-oriented approach even as the data volume increases. Some of the more typical coding standards for performance are related to the following:
Cursors Temporary tables Table variables Scalar functions
Coding standards
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It really doesn t matter what your actual coding standards are. What does matter is that you have coding standards.
Lesson 6: Creating Database Conventions
Quick Check
1. What is the most important aspect of naming conventions 2. What is the most important aspect of coding standards
Quick Check Answers
1. The most important aspect of naming conventions is that you have naming conventions. 2. The most important aspect of coding standards is that you have coding standards.
Practice: Creating a Synonym
In this exercise, you create a synonym for the dbo.uspGetBillOfMaterials stored proce dure in the AdventureWorks database. 1. Launch SSMS, and open a query window. 2. Execute the following code in the AdventureWorks database:
USE AdventureWorks GO CREATE SYNONYM Production.usp_BOM FOR AdventureWorks.dbo.uspGetBillOfMaterials GO
3. Test the synonym by executing the following code:
exec Production.usp_BOM 518,'1/23/2001'
Lesson Summary
Naming conventions provide standardization to the names within your data base. It does not matter what your naming conventions are, but they must be enforced. Coding standards provide guidance for the look and feel of code, as well as restrict the features that are applied because of performance reasons. Synonyms enable you to create aliases to isolate applications from the movement of objects between schemas, databases, and servers.
12
Designing the Physical Database
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 6, Creating Database Conventions. The questions are also available on the com panion CD if you prefer to review them in electronic form.
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