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CHAPTER 6 EMBEDDED MYSQL
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Creating the Project
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The best way to create the project is to use the wizard to create a new Windows project. I recommend opening the master solution file from the root of the source code directory and adding your new application as a new project to that solution. You don t have to store your source code in the same source tree, but you should store it in such a way as to know what version of the source code it applies to. You can create the project using the project wizard. You should select the CLR Windows Forms Application project template and name the project. This creates a new folder under the root of the folder specified in the wizard with the same name as the project. Creating a project file as a subproject of the solution gives you some really cool advantages. To take advantage of the automated build process (no make files yippee!), you need to add the libmysqld project to your projects dependencies. You can open the project dependencies tool from the Project Project Dependencies menu. You should also set the build configuration to Active(Debug) by using the solution s Configuration drop-down box and set the platform to Active(Win32) using the solution s Platform drop-down box on the standard toolbar. You also need to set some switches in the project properties. Open the project properties dialog box by selecting Project Properties or by right-clicking on the project and choosing Properties. The first item you will want to check is the runtime library generation. Set this switch to Multi-threaded Debug DLL (/MDd) by expanding the C/C++ label in the tree and clicking on the Code Generation label in the tree and selecting it from the Runtime Library drop-down list. Figure 6-1 earlier in this chapter shows the project properties dialog box and the location of this option. The next property you need to change is to add the MySQL include directory to your project properties. The easiest way to do this is to expand the C/C++ label and click on the Command Line label. This will display the command-line parameters. To add a new parameter, type it in the Additional Options text box. In this case, you need to add something like /I ../include. If you located your project somewhere other than under the MySQL source tree, you may need to alter the parameter accordingly. Figure 6-2 earlier in this chapter shows the project properties dialog box and the location of this option. You can also remove the precompiled header option if you do not want (or need) to use precompiled headers. This option is on the C/C++ Precompile Headers page in the project properties dialog box. Lastly, you should set the common language runtime setting to /clr. You can set this in the project properties dialog box by clicking on General in the tree and selecting Common Language Runtime Support (/clr) from the Common Language Runtime support option. Figure 6-7 shows the project dialog box and the location of this option.
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CHAPTER 6 EMBEDDED MYSQL
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Figure 6-7. Project properties dialog box: General page
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Design
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Designing the application required that I meet two important requirements. Not only did I need to design a user interface that is easy to use and free from errors, I also needed to be able to call a C API from a .NET application. If you do some searching in the MySQL forums and lists you will see where several poor souls have struggled with getting this to work. If you follow along with my example, you should not encounter those problems. The main cause of the problems seems to be the inability to call the C API functions in the embedded library. I get around this by writing my application in C++ using managed C++ code. Yes, it is true that you cannot use C API calls in a managed application, but C++ allows you to temporarily turn that off and back on by using the #pragma unmanaged and #pragma managed directives. The need to call unmanaged code is also a great motivator for encapsulation of the library calls. Unmanaged code enables the developer to write a DLL that can be used in programs that are not written in .NET. For this example, I am using a C++ class to encapsulate the C API calls wrapped in the #pragma unmanaged directive. This allows me to show you an example of using a .NET application that calls the embedded library C API directly. Cool, eh I also wanted to keep the user interface completely separate from anything to do with the embedded library. I wanted to do this so that I can provide you with an encapsulated database access class that you can reuse as the basis for your own applications. It also permits me to present to you one example (Windows) of a realistic application without long lists of source code for you to read through. The data access design for this example is therefore a single unmanaged C++ class that encapsulates the embedded library C API calls. The design also includes two forms: one for each of the user interfaces (Customer and Administrator).
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