The plugin implementation comprises several components.
SQL statements:
INSTALL PLUGIN
registers a
plugin in the plugin
table and loads the
plugin code.
UNINSTALL PLUGIN
unregisters
a plugin from the plugin
table and
unloads the plugin code.
The WITH PARSER
clause for full-text
index creation associates a full-text parser plugin with a
given FULLTEXT
index.
SHOW PLUGINS
displays
information about server plugins.
Command-line options and system variables:
The --plugin-load
option
enables plugins to be loaded at server startup time.
The plugin_dir
system
variable indicates the location of the directory where all
plugins must be installed. The value of this variable can be
specified at server startup with a
--plugin_dir=
option. mysql_config --plugindir displays
the default plugin directory path name.
path
For additional information about plugin loading, see Section 12.4.3.1, “Installing and Uninstalling Plugins”.
Source files (the locations indicate where the files are found in a MySQL source distribution):
In the include/mysql
directory,
plugin.h
exposes the public plugin API.
This file should be examined by anyone who wants to write a
plugin library.
plugin_
files provide additional information that pertains to
specific types of plugins.
xxx
.h
In the sql
directory,
sql_plugin.h
and
sql_plugin.cc
comprise the internal
plugin implementation. These files need not be consulted by
plugin developers. They may be of interest for those who
want to know more about how the server handles plugins.
Plugin-related tables:
The INFORMATION_SCHEMA.PLUGINS
table contains plugin information.
The mysql.plugin
table lists each plugin
that was installed with INSTALL
PLUGIN
and is required for plugin use. For new
MySQL installations, this table is created during the
installation process. If you are upgrading from a version of
MySQL older than 5.1, you should run
mysql_upgrade to update your system
tables and create the plugin
table (see
Section 4.4.7, “mysql_upgrade — Check Tables for MySQL Upgrade”).
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