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-- This is a comment. Whole line will be ignored.
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You can place the comment in the middle of a Transact-SQL statement. In the following example we will comment-out the last column:
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Select LeaseId, LeaseVendor --, LeaseNumber From Lease Where ContractDate > '1/1/1999'
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SQL Server 2000 Stored Procedure Programming
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This type of comment can be nested in another comment defined with the same or a different method:
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-- select * from Equipment - Just for debugging
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This commenting method is compatible with the SQL-92 standard.
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The second commenting method is native to SQL Server. It is suitable for commenting out blocks of code that can span multiple lines. Such a comment must be divided from the rest of the code with a pair of delimiters: (/*) and (*/):
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/* This is a comment. All these lines will be ignored. */ /* List all equipment. */ select * from Equipment
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Comments do not have a length limit. It is best to write as much as is necessary to adequately document the code. SQL Server documentation forbids the nesting of multi-line comments. In different versions and in different tools this may or may not generate a syntax error:
/* This is a comment. /* Query Analyzer will understand the following delimiter as the end of the first comment. */ This will generate a syntax error in some cases. */ Select * from Equipment
If you type this code in Query Analyzer, the program will not color the last line of explanation as a comment. (I am not sure you will be able to see a difference on the paper.) However, during the execution in Query Analyzer, the third line of the comment is ignored and will return a resultset without reporting a syntax error (see Figure 4-1).
4:
Basic Transact-SQL Programming Constructs
Figure 4-1.
Problems with comments
Single-line comments can be nested inside multi-line comments:
/* -- List all equipment. Select * from Equipment */
In 6, when we discuss batches, we will illustrate the requirement that multi-line comments not span two or more batches.
Documenting Code
Again, your comments will be of benefit to other developers who may read your code, and they will be better still if you make their presence in the code as obvious as possible. It is a favorable, although
SQL Server 2000 Stored Procedure Programming
not required, practice to accompany comment delimiters with a full line of stars, or to begin each commented line with two stars:
/***************************************************************** ** File: prInsertEquipment.sql ** Name: prInsertEquipment ** Desc: Insert equipment and equipment type ** ** ** Return values: ErrorCode ** ** Called by: ** ** Parameters: ** Input ** ---------** Make ** Model ** EqType ** ** Auth: Dejan Sunderic ** Date: 1/1/2000 ****************************************************************** ** Change History ****************************************************************** ** Date: ** -------** 11/1/2000 ** 11/2/2000 Author: -------DS DS Description: ------------------------------------Fixed:49. Better error handling. Fixed:36. Optimized for performance. Output ----------EqId middleware (if not present).
*****************************************************************/
Inserting two stars at the beginning of each line serves two purposes:
They are a visual guide for your eye. If you comment out code this way, you will not be in doubt whether a piece of code is functional or commented out. They will force SQL Server to report a syntax error if somebody makes an error (for example by nesting comments or by spanning comments over multiple batches).
4:
Basic Transact-SQL Programming Constructs
The preceding example is based on part of a SQL script for creating a stored procedure generated by Visual InterDev. It is very useful to keep track of all these items explicitly, especially Description and Change History. It is a personal choice to be more elaborate in describing stored procedures, but if you are, your comments can be used as instant design documentation. Occasionally, developers believe that this type of header is sufficient code documentation, but you should consider commenting your code throughout. It is important to comment not how things are being done, but what is being done. We recommend that you write your comments to describe what a piece of code is attempting to accomplish, then write the code itself. In this way, you create design documentation that eventually becomes code documentation.
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