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SQL Server 2000 Stored Procedure Programming
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Developers sometimes assume that SQL Server will return errors if a Transact-SQL statement affects no records. Unfortunately, this error is semantic rather than syntactic and SQL Server will not detect it. In order to determine such an error, use the @@rowcount function rather than the @@error function:
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declare @intRowCount int declare @intErrorCode int update Inventory Set StatusId = -3 where AssetId = -11 select @intRowCount = @@rowCount, @intErrorCode = @@Error if @@rowCount = 0 begin select "Record was not updated!" --return 50001 end
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I can recall one occasion when a colleague of mine spent two days going through a complicated data conversion process to find out why his process was consistently failing. In one of the nested stored procedures, I had declared the variable as tinyint instead of int. During the testing phase of the project, everything worked perfectly, because the variable was never set to a value higher than 255. However, a couple of months later in production, the process started to fail as values climbed higher. Similar problems can occur if you do not fully understand the differences between similar formats (for example, char and varchar, money and smallmoney), or if you fail to synchronize
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the sizes of datatypes (for instance, char, varchar, numeric, and other datatypes of variable size).
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A similar problem can occur when a developer does not supply the length of the variable datatype and SQL Server assigns a default length. For example, the default length of the varchar datatype is 30. Most of the time SQL Server reports an error if the length is omitted, but not in all cases. In the Convert function, for example, the user need only specify the datatype:
Convert(varchar, @intPropertyId)
If the resulting string is short enough, you will not have any problems. I recall a colleague who employed this method for years without any problems, and then . Unfortunately, other statements and functions behave as expected. If you declare a variable and assign it like so:
Declare @test varchar Set @test = '123456789012345678901234567890' Select datalength(@test), @test
SQL Server will allocate just one byte to the string and return the following:
----------- ---1 1
(1 row(s) affected)
Rollback of Triggers
In different versions of SQL Server, triggers react differently in rollback transaction statements. When a trigger is rolled back in SQL Server 7.0 or SQL Server 2000, the complete batch that initiated the trigger fails and the execution continues from the first statement of the next batch.
SQL Server 2000 Stored Procedure Programming
Version 4.2 behaves in a similar manner. In version 6.0, processing continues in the trigger, but the batch is canceled. In version 6.5, the processing continues in both the trigger and the batch. It was the responsibility of the developer to detect errors and cascade out of the process.
Warnings and Lower Priority Errors
Warnings do not stop the execution of a stored procedure. In fact, you cannot even detect them from within the SQL Server environment. Low-level errors, which are detectable using the @@error function, do not abort the execution either. Unfortunately, there are also errors that abort processing completely, so that the error handlers in stored procedures do not process the error.
Nested Comments
Only single line comments (--) can be nested. Nested multiline comments (/* */) may be treated differently by different client tools. I recommend that you put one or two stars (**) at the beginning of each line that is commented out. In this manner, the problem will be obvious if the comments are nested and SQL Server starts to compile part of the code that you consider to be commented out.
/************************************************************ ** ** select * from #Properties
*************************************************************/
Deferred Name Resolution
It is possible (in Microsoft SQL Server 7.0 and Microsoft SQL Server 2000) to create database objects (such as stored procedures and triggers) that refer to other database objects that do not exist within the database. In previous versions, such attempts were treated as syntax errors. This feature helps tremendously when you need to generate a database structure and objects using script. Unfortunately, that introduces a number of risks. If you make a typo in the name
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