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CHAPTER 6 EMBEDDED MYSQL
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Listing 6-6. Embedded Example 1 (Linux: example1_linux.c) #include <my_global.h> #include <mysql.h> MYSQL *mysql; MYSQL_RES *results; MYSQL_ROW record; /* These variables set the location of the ini file and data stores. */ static char *server_options[] = {"mysql_test", "--defaults-file=/var/lib/mysql_embedded/my.cnf", "--datadir=/var/lib/mysql_embedded" }; 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; */ //the embedded server class //stores results from queries //a single row in a result set
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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_dbug_print("Creating the database testdb1."); mysql_query(mysql, "CREATE 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_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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//record trace //issue query //get results //fetch row //process row //record trace
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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, 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 requires that I use the mysql_config script to identify the location of the libraries. The script returns to the command line the actual path each of the options passed to it. You can also run the script from a command line and see all of the options and their values. A sample command to compile the example is shown here: gcc example1_linux.c -g -o example1_linux '/usr/local/mysql/bin/mysql_config --include --libmysqld-libs' This command should work for most Linux systems. However, there are some cases where this could be a problem. If your MySQL installation is at another location, you may need to alter the phrase with the mysql_config script. If you have multiple installations of MySQL on your system or you have installed the embedded library in another location, you may not be able to use the mysql_config script because it will return the wrong library paths. This is also
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CHAPTER 6 EMBEDDED MYSQL
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true for cases where you have multiple versions of the MySQL source code installed. You certainly want to avoid the case of using the include files from one version of the server to compile an embedded library from another. You could also run into problems if you do not have the earlier glibc libraries. To correct these problems, you should first run the mysql_config script from the command line and note the paths for the libraries. You should also locate the correct paths to the libraries and header files you want to use. An example of how I overcame these problems is shown here (I have all of these situations on my SUSE machine): g++ example1_linux.c -g -o example1_linux -lz -I/usr/include/mysql -L/usr/lib/mysql -lmysqld -lz -lpthread -lcrypt -lnsl -lm -lpthread -lc -lnss_files -lnss_dns -lresolv -lc -lnss_files -lnss_dns -lresolv -lrt Notice I used the newer g++ compiler instead of the normal gcc. This is because my system has the latest GNU libraries and does not have the older ones. I could, of course, have loaded the older libraries and fixed this problem but typing g++ is much easier. OK, so we programmers are lazy. Listing 6-7 shows the sample output of running this example under a typical installation of MySQL. In this case, I copied all of the data from the stand-alone server directory to my embedded server directory. Listing 6-7. Sample Output linux:/home/Chuck/source/Embedded # ./example1_linux The following are the databases supported: information_schema mysql test The following are the databases supported: information_schema mysql test testdb1 linux:/home/Chuck/source/Embedded # 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. The next example will show you how to encapsulate the embedded library calls and demonstrate their use in a more realistic application.
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