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CHAPTER 6 EMBEDDED MYSQL
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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.
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Figure 6-2. Project properties dialog box: Command Line page Now that you have the project configured correctly, all you need to do is add your source file or paste in the example code if you chose to create the base project files when you created the project. Listing 6-9 shows the complete Windows version. Listing 6-9. Embedded Example 1 (Windows: example1_win32.cpp) #include "my_global.h" #include "mysql.h" MYSQL *mysql; MYSQL_RES *results; MYSQL_ROW record; //the embedded server class //stores results from queries //a single row in a result set
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CHAPTER 6 EMBEDDED MYSQL
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/* These variables set the location of the ini file and data stores. */ static char *server_options[] = {"mysql_test", "--defaults-file=c:\\mysql_embedded\\my.ini", "--datadir=c:\\mysql_embedded\\data" }; int num_elements=sizeof(server_options) / sizeof(char *); static char *server_groups[] = {"libmysqld_server", "libmysqld_client" }; int main(void) { /* This section initializes the server and sets server options. */ mysql_server_init(num_elements, server_options, server_groups); mysql = mysql_init(NULL); mysql_options(mysql, MYSQL_READ_DEFAULT_GROUP, "libmysqld_client"); mysql_options(mysql, MYSQL_OPT_USE_EMBEDDED_CONNECTION, NULL); /* The following call turns debugging on programmatically. Comment out to turn off debugging. */ //mysql_debug("d:t:i:O,\\mysqld_embedded.trace"); /* Connect to embedded server. */ mysql_real_connect(mysql, NULL, NULL, NULL, "information_schema", 0, NULL, 0); /* This section executes the following commands and demonstrates how to retrieve results from a query. SHOW DATABASES; CREATE DATABASE testdb1; SHOW DATABASES; DROP DATABASE testdb1; */ mysql_dbug_print("Showing databases."); mysql_query(mysql, "SHOW DATABASES;"); results = mysql_store_result(mysql); printf("The following are the databases supported:\n"); while(record=mysql_fetch_row(results)) { printf("%s\n", record[0]); } mysql_dbug_print("Creating the database testdb1."); mysql_query(mysql, "CREATE DATABASE testdb1;"); //record trace //issue query //get results //fetch row //process row //record trace
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CHAPTER 6 EMBEDDED MYSQL
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mysql_dbug_print("Showing databases."); mysql_query(mysql, "SHOW DATABASES;"); results = mysql_store_result(mysql); printf("The following are the databases supported:\n"); while(record=mysql_fetch_row(results)) { printf("%s\n", record[0]); } mysql_free_result(results); mysql_dbug_print("Dropping database testdb1."); mysql_query(mysql, "DROP DATABASE testdb1;"); /* Now close the server connection and tell server we're */ mysql_close(mysql); mysql_server_end(); return 0; }
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//issue query //get results //fetch row //process row
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//record trace //issue query done (shutdown).
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I ve added comments (some would say overkill) to help you follow along in the code. The first thing I do is create my global variables and set up my initialization arrays. I then initialize the server with the array options, set a few more options if necessary, and connect to the server. The body of the example application reads data from the database and prints it out. The last portion of the example closes and finalizes the server. Compiling the example is really easy. Just select Build Build example1_win32. If you have already compiled the libmysqld project, all you should see is the compilation of the example. If for some reason the object files are out of date for libmysqld or any of its dependencies, Visual Studio will compile those as well.
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Caution You may encounter some really strange errors found in the mysql_com.h or similar header
files. The most likely cause of this may be an optimization strategy. Microsoft automatically includes the #define WIN32_LEAN_AND_MEAN statement in the stdafx.h file. If you have that turned on, it tells the compiler to ignore a host of includes and links that are not needed (normally). You will want to delete that line altogether (or comment it out). Your program should now compile without errors. If you opted to not use the stdafx files, you should not encounter this problem.
When the compilation is complete, you can either run the program from the debug menu commands or open a command window and run it from the command line. If this is your first time, you should see an error message like the following: This application has failed to start because LIBMYSQLD.dll was not found. Re-installing the application may fix this problem.
CHAPTER 6 EMBEDDED MYSQL
The reason for this error has nothing to do with the second sentence in the error message. It means the embedded library isn t in the search path. If you have worked with .NET or COM applications and never used C libraries, then you may have never encountered the error. Unlike .NET and COM, C libraries are not registered in a Global Assembly Cache (GAC) or registry. These libraries (DLLs) should be collocated with applications that call them or at least on an execution path. Most developers place a copy of the DLL in the execution directory. To fix this problem, you ll need to copy the libmysqld.dll file from the lib_debug directory to the directory where the example1_win32.exe file resides (or add lib_debug to the execution path). Once you get past that hurdle, you should see an output like that shown in Listing 6-10. Listing 6-10. Example Output D:\source\C++\mysql-5.0.22\example1_win32\Debug>example1_win32 The following are the databases supported: information_schema cluster mysql test The following are the databases supported: information_schema cluster mysql test testdb1 Please take some time and explore this example application on your own machine. I recommend you experiment with the body of the application and run a few queries of your own to get a feel for how you might write your own embedded MySQL application. If you implemented the mysql_dbug_print() function in your embedded library, try it out with the example by either removing the comments on the mysql_debug() function call or by removing the comments for the debug option in the configuration file.
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