SQL Server 2000 Stored Procedure & XML Programming in .NET

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SQL Server 2000 Stored Procedure & XML Programming
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A running trace
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the selected event. In the case of batches and stored procedures in the TextData column, you can find (and copy to Query Analyzer) the command that caused an error. SQL Profiler may consume substantial resources if you just run it without careful planning. For example, gathering too many different events and too many data columns without filtering might reduce the performance of the monitored server; and the trace itself might overwhelm the machine with the amount of data gathered. Some database departments have therefore introduced very rigid limitations on the use of SQL Profiler in production environments. It is unfortunate to lose such a valuable tool, but there are ways to reduce resource contention: Do not run SQL Profiler on the server that you are monitoring. If the volume of the gathered data is an issue, save it to a file (not to the screen or a database table). Storing trace data in a database table allows you to analyze it with the full power of SQL Server tools, but it might also introduce a performance problem. Ideally, gather data in a file and then periodically load it to a database table.
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7: Debugging and Error Handling
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To reduce network contention on a busy production server, add a new network connection dedicated to SQL Profiler (in other words, an additional NIC and additional network). Use PerfMon to track the impact of SQL Profiler on the production system.
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You should keep the following issues in mind when you are writing your code and testing Transact-SQL programs: Handling null Assignment of variable from the result set No records affected Wrong size or data type Default length Rollback of triggers Warnings and lower-priority errors Nested comments Deferred name resolution Cursors Overconfidence
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Many errors are a result of the inadequate treatment of null values in Transact-SQL code. Developers often forget that local variables or table columns might contain null. If such a value becomes part of any expression, the result will also be null. The proper way to test the value of an expression for null is to use the Is Null or Is Not Null clause. Microsoft SQL Server treats the use of = Null as another way to type Is Null (when Set Ansi_Nulls is set to Off), but <> Null is not the equivalent of Is Not Null. The result of such an expression is always simply null. It will never be true, and stored procedures will always skip statements after the If statement when you use the <> Null clause.
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If @intInventoryId IS NULL ... If @intInventoryId = NULL
SQL Server 2000 Stored Procedure & XML Programming
... If @intInventoryId IS NOT NULL ... If @intInventoryId <> NULL -- WRONG!!! ...
Assignment of Variable from the Result Set
Earlier, I discussed assigning the value for a variable using the result set of the Select statement. This technique is fine when the result set returns only one record. However, if the result set returns more than one record, the variable is assigned using the value from the last record in the recordset not perfect, but in some cases, you can live with it. It is sometimes difficult to predict which record will be returned last in the recordset. It depends on both the query and the index that SQL Server has used. A more serious problem occurs when the recordset is empty. The values of the variables are changed in this case, and the code is vulnerable to several mistakes. If you do not expect the result set to be empty, your stored procedure will fail. If you expect the values of the variables to be null, your stored procedure will function correctly only immediately after it is started (that is, in the first iteration of the process). In such a case, the local variables are not yet initialized and will contain null. Later, when variables are initialized, their values will remain unchanged. If you are testing the contents of the variables for null to find out if the record was selected, you will just process the previous record again.
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