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SDI adds substantial overhead and makes the machine run more slowly. For this reason, you should never use the T-SQL Debugger on a production machine.
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Using the T-SQL Debugger in Visual Studio This section demonstrates the use of the T-SQL Debugger from Visual InterDev. The major difference between debugging stored procedures and debugging within other programming languages is that you do not need to run the application to debug a single procedure.
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1. Open Data View in Visual InterDev. 2. Open Stored Procedures and right-click the prGetInventoryProperties_3 stored
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3. When you click Debug, the T-SQL Debugger starts the procedure and prompts
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you for input parameters (see Figure 7-2). Use the Value combo box to select <DEFAULT> or Null, or enter an appropriate value.
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4. Click OK. The T-SQL Debugger opens the source code of the procedure and
pauses on the first executable statement. A small yellow arrow on the left border marks the position of the statement to be executed next. The commands in the Debug menu become enabled, as do two more windows, described next, that enable you to examine the state of the environment, as shown in Figure 7-3. Locals window Allows you to scroll through the local variables and parameters of the stored procedure and to see its current contents and data type:
7: Debugging and Error Handling
Figure 7-3
The T-SQL Debugger
As the stored procedure s code is executed, the values of variables change. To help you follow the execution, the T-SQL Debugger colors the values of variables that were changed in the previous statement. The Locals window allows you to change values of variables interactively during execution of the code. This window has more than one tab, but only this one has meaning in the T-SQL Debugger. The other tabs are used to debug client applications. Watch window Has a similar function to the Locals window. You can type, or drag from the code, a Transact-SQL expression to be evaluated in this window. This feature is useful when you want to investigate the values of expressions in If, While, Case, and other similar statements. The Watch window also contains an Output tab, which displays result sets returned by the Select statement and messages sent from the Print statement.
5. Click the Debug menu. The majority of commands available on the Debug
menu target execution control. Most of the time, you will use the Step Into or Step Over commands to step through a stored procedure. These commands
SQL Server 2000 Stored Procedure & XML Programming
execute one Transact-SQL statement at a time. The difference between them is in the way they behave when they encounter a nested stored procedure: Step Into Opens the code of the nested stored procedure and lets you step through it. Step Over The nested stored procedure is treated as any other TransactSQL statement and is executed in a single step. Step Out Enables you to execute the rest of the nested stored procedures without pause and halts only when the stored procedure is completed in the calling stored procedure. Run To Cursor Enables you to position the cursor somewhere in the code and to execute everything to that point in a single step. In essence, this command lets you set a temporary breakpoint.
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Breakpoints are markers in code that serve to stop execution when certain conditions are met. In the T-SQL Debugger, the only such condition is when the execution has reached the position of the breakpoint. In Visual Basic, Visual C++, and other tools, the condition can be met when a variable changes value, when a breakpoint has been reached a selected number of times, or when a Boolean expression is true.
6. Right-click a line of code containing an executable Transact-SQL statement,
then choose Insert Breakpoint on the Debug menu. SQL Server marks that position with a red dot on the left border. The breakpoint makes it unnecessary to step through the code. Just run it and it will stop when execution reaches the breakpoint. From this point, you can either explore variables or continue to step through the code, as shown in Figure 7-4. If you want to continue until another breakpoint is reached, use the Debug | Start menu item. One of my favorite features in the Visual Basic debugger is the ability to continue execution from the position of the cursor. Unfortunately, due to the architecture of the T-SQL Debugger, the Set Next Step command is not available.
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