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Creating an Embedded Server
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The embedded server is established as an instance during the initialization function calls. Most of the functions require a pointer to the instance of the server as a required parameter. When you create an embedded MySQL application, you need to create a pointer to the MYSQL object. You also need to create instances for a result set and a row from the result set (known as a record). Fortunately, the definition of the server and the major structures are defined in the MySQL header files. The two header files you need to use (and the only two for most applications) are
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CHAPTER 6 EMBEDDED MYSQL
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#include <my_global.h> #include <mysql.h> Creating pointer variables to the embedded server and the result set and record structure can be done by using the following statements: 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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These statements allow you to have access to the embedded server (MYSQL), a result structure (MYSQL_RES), and a record (MYSQL_ROW). You can use global variables to define these pointers. Some of you may not like to use global variables and there s no reason you have to. The result set and record can be created and destroyed however you like. Just be sure to keep the MYSQL pointer variable the same instance throughout your application. We re not done with the setup. We still need to establish some strings to use during connection. I ve seen many different ways to accomplish this, but the most popular method is to create an array of character strings. At a minimum, you need to create character strings for the location of the my.cnf (my.ini in Windows) file and the location of the data. A typical set of initialization character strings is static char *server_options[] = {"mysql_test", "--defaults-file=c:\\mysql_embedded\\my.ini", "--datadir=c:\\mysql_embedded\\data" }; The examples in this chapter depict the server options for a Windows compilation. If you use Linux, you will need to use the appropriate paths and change the my.ini to my.cnf. In this example, I use the label "mysql_test" (which is ignored by mysql_server_init()), the location of my.cnf (my.ini) file to the normal installation directory, and the data directory to the normal MySQL installation. If you want to establish both a stand-alone and an embedded server, you should use a different data location for each server. You would also want to use a different configuration file just to keep things tidy. To help keep errors to a minimum, I also use an integer variable to identify the number of elements in my array of strings (I ll discuss this in a moment). This allows me to write boundschecking code without having to remember how many elements are permitted. I can allow the number of elements to change at runtime, thereby allowing the bounds-checking code to adapt to changes as necessary. int num_elements=sizeof(server_options) / sizeof(char *); The last setup step is to create another array of character strings that identify the server groups that contain any additional server options in my configuration file (my.cnf). This defines the sections that will be read when the server is started. static char *server_groups[] = {"libmysqld_server", "libmysqld_client" };
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Initializing the Server
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The embedded server must be initialized, or started, before you can connect to it. This usually involves two initialization calls followed by any number of calls to set additional options. The first initialization function you need to call to start an embedded server is mysql_server_init(). This function is defined as
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CHAPTER 6 EMBEDDED MYSQL
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int mysql_server_init(int argc, char **argv, char **groups) The function is called only once before calling any other function. It takes as parameters argc and argv much the same as the normal arguments for a program (the same as the main function). In addition, the group labels from the configuration are passed to allow the server to read runtime server options. The return values are either a 0 for success or 1 for failure. This allows you to call the function inside a conditional statement and act if a failure occurs. Here s an example call of this function using the declarations from the startup section: mysql_server_init(num_elements, server_options, server_groups);
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Note In order to keep the example short and easily understood, I ll refrain from using error handling in the
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