Developing Information Schema Plugins

Developing INFORMATION_SCHEMA Plugins ,[object Object],[object Object],[object Object]

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

INFORMATION_SCHEMA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plugins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],The Plugin Interface struct st_mysql_plugin { int type; /* the plugin type (a MYSQL_XXX_PLUGIN value) */ void *info; /* pointer to type-specific plugin descriptor */ const char *name; /* plugin name */ const char *author; /* plugin author (for SHOW PLUGINS) */ const char *descr; /* general descriptive text (for SHOW PLUGINS ) */ int license; /* the plugin license (PLUGIN_LICENSE_XXX) */ int (*init)( void *); /* the function to invoke when plugin is loaded */ int (*deinit)( void *) /* the function to invoke when plugin is unloaded */ unsigned int version; /* plugin version (for SHOW PLUGINS) */ struct st_mysql_show_var *status_vars; struct st_mysql_sys_var **system_vars; void * __reserved1; /* reserved for dependency checking */ };

Plugin Types ,[object Object],[object Object],MYSQL_UDF_PLUGIN 0 /* User-defined function */ MYSQL_STORAGE_ENGINE_PLUGIN 1 /* Storage Engine */ MYSQL_FTPARSER_PLUGIN 2 /* Full-text parser plugin */ MYSQL_DAEMON_PLUGIN 3 /* The daemon/raw plugin type */ MYSQL_INFORMATION_SCHEMA_PLUGIN 4 /* The I_S plugin type */ ,[object Object],int schema_tables_add(THD *thd, List<LEX_STRING> *files, const char *wild) { … if (plugin_foreach(thd, add_schema_table, MYSQL_INFORMATION_SCHEMA_PLUGIN, &add_data)) DBUG_RETURN( 1 );

Starting a HELLO_WORLD Table ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Define the Table Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Closer Look ,[object Object],[object Object],[object Object],VARCHAR INT BIGINT DECIMAL DATETIME MYSQL_TYPE_STRING MYSQL_TYPE_LONG MYSQL_TYPE_LONGLONG MYSQL_TYPE_DECIMAL MYSQL_TYPE_DATETIME MY_I_S_MAYBE_NULL MY_I_S_UNSIGNED SKIP_OPEN_TABLE OPEN_FRM_ONLY OPEN_FULL_TABLE

Define Function to Fill Table ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Create the Init Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Create the Deinit Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Create the Plugin Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Build the Plugin ,[object Object],[object Object],[object Object],g++ -DMYSQL_DYNAMIC_PLUGIN -shared > -I/home/leithal/mysql/mysql-5.1/include > -I/home/leithal/mysql/mysql-5.1/sql > -o is_hello_world.so hello_world.cc ls -l total 16 -rw-r--r-- 1 leithal leithal 1712 2008-04-11 14:20 hello_world.cc -rwxr-xr-x 1 leithal leithal 8226 2008-04-11 14:27 is_hello_world.so cp is_hello_world.so /usr/local/mysql/lib/mysql/plugin

Install and Use! mysql> INSTALL PLUGIN HELLO_WORLD SONAME 'is_hello_world.so'; Query OK, 0 rows affected (0.01 sec) mysql> USE INFORMATION_SCHEMA; Database changed mysql> SHOW TABLES LIKE 'HELL%'; +--------------------------------------+ | Tables_in_information_schema (HELL%) | +--------------------------------------+ | HELLO_WORLD | +--------------------------------------+ 1 row in set (0.00 sec) mysql> SELECT * FROM HELLO_WORLD; +-------+-------+ | HELLO | WORLD | +-------+-------+ | Hello | World | +-------+-------+ 1 row in set (0.00 sec)

So We'll Do Something Interesting ,[object Object],root@achilles:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/hda1 4.6G 3.5G 886M 81% / varrun 126M 84K 125M 1% /var/run varlock 126M 0 126M 0% /var/lock procbususb 10M 76K 10M 1% /proc/bus/usb udev 10M 76K 10M 1% /dev devshm 126M 0 126M 0% /dev/shm lrm 126M 18M 108M 14% /lib/modules/2.6.17-12-generic/volatile ,[object Object],[object Object],[object Object]

Create Template & Table Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Running Other Programs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tokenize and Push Results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Store the Row and Finish up ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Build, Install, Try.. ,[object Object],mysql> select * from file_system_mountpoints; +------------+------------+------------+-----------+----------+-----------------------------------------+ | FILESYSTEM | SIZE | USED | AVAILABLE | CAPACITY | MOUNTED_ON | +------------+------------+------------+-----------+----------+-----------------------------------------+ | /dev/hda1 | 4939212390 | 3758096384 | 930086912 | 81% | / | | varrun | 132120576 | 86016 | 131072000 | 1% | /var/run | | varlock | 132120576 | 0 | 132120576 | 0% | /var/lock | | procbususb | 10485760 | 77824 | 10485760 | 1% | /proc/bus/usb | | udev | 10485760 | 77824 | 10485760 | 1% | /dev | | devshm | 132120576 | 0 | 132120576 | 0% | /dev/shm | | lrm | 132120576 | 18874368 | 113246208 | 14% | /lib/modules/2.6.17-12-generic/volatile | +------------+------------+------------+-----------+----------+-----------------------------------------+ 7 rows in set (0.06 sec) mysql> desc file_system_mountpoints; +------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+-------+ | FILESYSTEM | varchar(120) | NO | | | | | SIZE | bigint(11) | NO | | 0 | | | USED | bigint(11) | NO | | 0 | | | AVAILABLE | bigint(11) | NO | | 0 | | | CAPACITY | varchar(4) | NO | | | | | MOUNTED_ON | varchar(120) | NO | | | | +------------+--------------+------+-----+---------+-------+ 6 rows in set (0.01 sec)

Now Let's Use another Library ,[object Object],[object Object],[object Object],[object Object]

Include Lib Header, Use Lib in Fill ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Building and Including the Library ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Try it out! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Resources and Questions! ,[object Object],[object Object],[object Object],[object Object]

Developing Information Schema Plugins

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