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MySQL 5.5 Reference Manual
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Excerpts from this Manual mysql_load_plugin()

struct st_mysql_client_plugin *mysql_load_plugin(MYSQL *mysql, const char *name, int type, int argc, ...)


Loads a MySQL client plugin, specified by name and type. An error occurs if the type is invalid or the plugin cannot be loaded.

It is not possible to load multiple plugins of the same type. An error occurs if you try to load a plugin of a type already loaded.

Specify the parameters as follows:

  • mysql: A pointer to a MYSQL structure. The plugin API does not require a connection to a MySQL server, but this structure must be properly initialized. The structure is used to obtain connection-related information.

  • name: The name of the plugin to load.

  • type: The type of plugin to load, or −1 to disable type checking. If type is not −1, only plugins matching the type are considered for loading.

  • argc: The number of following arguments (0 if there are none). Interpretation of any following arguments depends on the plugin type.

Another way to cause plugins to be loaded is to set the LIBMYSQL_PLUGINS environment variable to a list of semicolon-separated plugin names. For example:

shell> export LIBMYSQL_PLUGINS="myplugin1;myplugin2"

Plugins named by LIBMYSQL_PLUGINS are loaded when the client program calls mysql_library_init(). No error is reported if problems occur loading these plugins.

Return Values

A pointer to the plugin if it was loaded successfully. NULL if an error occurred.

MYSQL mysql;

if(!mysql_load_plugin(&mysql, "myplugin",
    fprintf(stderr, "Error: %s\n", mysql_error(&mysql));