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3. When you click Debug, TSQL Debugger starts the procedure and prompts you for input parameters (see Figure 7-2). Use the Value combo box to select <DEFAULT> or Null or type something appropriate. 4. Click OK. TSQL 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 that enable you to examine the state of the environment, as shown in Figure 7-3.
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The Locals window allows you to scroll through the local variables and parameters of the stored procedure and to see its current contents and datatype:
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As the stored procedure s code is executed, the values of variables change. To help you follow the execution, TSQL Debugger colors the values of variables that were changed
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Debugging and Error Handling
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 TSQL Debugger. The other tabs are used to debug client applications.
The Watch window has a similar function. 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 resultsets 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 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.
If you choose Step Into, TSQL Debugger opens the code of the nested stored procedure and lets you step through it. If you choose Step Over, the nested stored procedure is treated as any other Transact-SQL statement and is executed in a single step. The Step Out command 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. A useful option on the Debug menu is Run To Cursor, which 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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NOTE: Breakpoints are markers in a code that serve to stop execution when certain conditions are met. In TSQL 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. Next, 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 big red dot on the left border. The breakpoint makes it unnecessary to step through the code. Just run it and it will stop at the position that interests you. From this point, you can either explore variables or continue to step through the code, as shown in Figure 7-4.
Figure 7-4.
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