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When execution reaches the breakpoint in the debugger, the server will stop and the ddd debugger will display the code with an arrow pointing to the breakpoint. You ll also notice that the client has stopped. If you take too long debugging, the client may time out. This is why I used the connection timeout override. Once the debugger has halted execution, you can begin to explore the code and examine the values of any variable, the stack, or memory. I have set the debugger to examine the authors structure to see the data as it is being written to the client. Figure 5-5 depicts the ddd debugger with the authors structure displayed in the data window.
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Figure 5-5. ddd debugging the show_authors() function
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I can also expand the authors structure and see the current contents. Figure 5-6 shows the contents of the authors structure displayed in the data window.
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Figure 5-6. The authors structure data in the ddd debugger Notice that the values and the addresses are displayed in the data window. The ddd debugger also allows you to modify the contents of memory. Let s say I am debugging this method and I want to change the values in the authors structure. I could do that simply by right-clicking on each of the items in the authors structure, choosing Set Value from the rightclick menu, and then changing the value. Figure 5-7 shows that I ve changed the contents of the authors structure.
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Figure 5-7. The authors structure data changed You might be wondering if this actually works. Well, it does! Listing 5-16 shows the output from the client (I omitted many lines for clarity). Notice that the data I changed was indeed sent to the client.
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Listing 5-16. Resulting Output from Data Modifications +----------------+------------------+----------------------------------------+ | Name | Location |Comment | +----------------+------------------+----------------------------------------+ | John Doe | Anytown, USA | All around nice guy. | ... +----------------+------------------+----------------------------------------+ 74 rows in set (48.35 sec) mysql> Once I ve finished my debugging session, I issue the command to shut down the server and then exit ddd: mysqladmin -uroot -p shutdown As you can see from this simple example, debugging with ddd can be a useful experience and allows you to see the code as it executes. The power of being able to see the data as it is associated with the current execution is an effective means of discovering and correcting defects. I encourage you to try the example and play around with ddd until you are comfortable using it.
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Debugging in Windows
The main method of debugging in Windows is using Microsoft Visual Studio .NET. Some developers have had success using other tools, such as external debuggers, but most will use the debugger that is integrated with Visual Studio .NET. Using an integrated debugger is convenient because you can compile and debug from the same interface.
Note Older versions of the Windows source code for the MySQL system included project and solution files for Microsoft Visual Studio 6 and Visual Studio .NET 2003, respectively. You can convert these project and solution files to Visual Studio .NET 2005. The examples that follow use Visual Studio .NET 2005 Academic Version. The academic version is a full-featured release. It is branded as academic because it s sold to students and faculty at a reduced cost. A great number of vendors offer reduced pricing for academics.
I will use the same scenario as the ddd example earlier. While the steps are similar, you ll see some differences. Specifically, I begin my debugging session by launching Visual Studio and opening the mysql.sln solution file in the root of the source code directory. I make sure my session is set to compile the program in debug for the win32 platform. This will ensure that the proper debug information is compiled into the executable. Once Visual Studio is launched and the correct compilation mode is set, I can set my breakpoint (again, on line 207 in the show_authors() function). Figure 5-8 shows Visual Studio properly configured with the breakpoint set.
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