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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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FILEINFO *file; longlong fsizes = 0; longlong lsizes = 0; Protocol *protocol= thd->protocol; DBUG_ENTER("fill_disk_usage"); /* get database directories */ mysql_find_files(thd, &dbs, 0, mysql_data_home, 0, 1); List_iterator_fast<char> it_dbs(dbs); path = (char *)my_malloc(PATH_MAX, MYF(MY_ZEROFILL)); dirp = my_dir(mysql_data_home, MYF(MY_WANT_STAT)); fsizes = 0; for (int i = 0; i < (int)dirp->number_off_files; i++) { file = dirp->dir_entry + i; if (strncasecmp(file->name, "ibdata", 6) == 0) fsizes = fsizes + file->mystat->st_size; else if (strncasecmp(file->name, "ib", 2) == 0) lsizes = lsizes + file->mystat->st_size; } /* send InnoDB data to client */ table->field[0]->store("InnoDB TableSpace", strlen("InnoDB TableSpace"), scs); table->field[1]->store((longlong)fsizes, TRUE); if (schema_table_store_record(thd, table)) DBUG_RETURN(1); table->field[0]->store("InnoDB Logs", strlen("InnoDB Logs"), scs); table->field[1]->store((longlong)lsizes, TRUE); if (schema_table_store_record(thd, table)) DBUG_RETURN(1); /* now send database name and sizes of the databases */ while (db_name = it_dbs++) { fsizes = 0; strcpy(path, mysql_data_home); strcat(path, "/"); strcat(path, db_name); dirp = my_dir(path, MYF(MY_WANT_STAT)); for (int i = 0; i < (int)dirp->number_off_files; i++) { file = dirp->dir_entry + i; fsizes = fsizes + file->mystat->st_size; } restore_record(table, s->default_values);
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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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table->field[0]->store(db_name, strlen(db_name), scs); table->field[1]->store((longlong)fsizes, TRUE); if (schema_table_store_record(thd, table)) DBUG_RETURN(1); } /* free memory */ my_free((gptr)path, MYF(0)); DBUG_RETURN(0); } /* END CAB MODIFICATION */
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Note On Windows, substitute MAX_PATH for PATH_MAX in the my_malloc() calls and use strnicmp in
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place of the strncasecmp.
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I copied the code from the previous DISK_USAGE command, removing the calls for creating fields (that s handled via the disk_usage_fields_info array) and the code for sending rows to the client. Instead, I use an instance of the TABLE class/structure to store values in the fields array starting at zero for the first column. The call to the function schema_table_store_record() function dumps the values to the network protocols for me. Everything is now set for you to compile the server. Since you have modified one of the key header files (table.h), you may encounter longer-than-normal compilation times as some of the dependencies for the mysqld project may have to be compiled. Should you encounter compilation errors, please correct them before you proceed. Once the server is compiled and you have a new executable, stop your server and copy the new executable to the location of your MySQL installation and restart the server. You can now execute the new command in a MySQL client utility. Listing 8-33 shows an example of using the information schema, displaying all of the available schema tables, and dumping the contents of the new DISKUSAGE table. Listing 8-33. Example Information Schema Use with the new DISKUSAGE Schema Table mysql> USE INFORMATION_SCHEMA; Database changed mysql> SHOW TABLES; +---------------------------------------+ | Tables_in_information_schema | +---------------------------------------+ | CHARACTER_SETS | | COLLATIONS | | COLLATION_CHARACTER_SET_APPLICABILITY | | COLUMNS | | COLUMN_PRIVILEGES |
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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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| ENGINES | | DISKUSAGE | | EVENTS | | FILES | | KEY_COLUMN_USAGE | | PARTITIONS | | PLUGINS | | PROCESSLIST | | ROUTINES | | SCHEMATA | | SCHEMA_PRIVILEGES | | STATISTICS | | TABLES | | TABLE_CONSTRAINTS | | TABLE_PRIVILEGES | | TRIGGERS | | USER_PRIVILEGES | | VIEWS | +---------------------------------------+ 23 rows in set (0.00 sec) mysql> SELECT * FROM DISKUSAGE; +-------------------+-----------+ | DATABASE | SIZE (Kb) | +-------------------+-----------+ | InnoDB TableSpace | 10485760 | | InnoDB Logs | 20971520 | | cluster | 9867 | | mysql | 617310 | | test | 9720 | +-------------------+-----------+ 5 rows in set (0.31 sec) Now that you know how to add to the information schema, the sky is the limit for what you can add to enable your database professionals to more closely monitor and tune your MySQL servers.
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In this chapter, I ve shown you how to extend the capabilities of the MySQL server by adding your own new functions and commands. You learned how to build a UDF library that can be loaded and unloaded at runtime, how to add a native function to the server source code, and how to add a new SHOW command to the parser and query execution code. You also learned how to add schema tables to the information schema.
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