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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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SCH_DISKUSAGE, /* END CAB MODIFICATION */ SCH_EVENTS, ... Now you need to add the case for the switch command in the prepare_schema_tables() function that creates the new schema table. Open the sql_parse.cc file and add the case statement shown in Listing 8-29. Notice that I just added the case without a break statement. This allows the code to fall through to code that satisfies all of the case. This is an elegant alternative to lengthy if-then-else-if statements that you see in most source code. Listing 8-29. Modifications to the prepare_schema_table Function int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident, enum enum_schema_tables schema_table_idx) { DBUG_ENTER("prepare_schema_table"); ... case SCH_ENGINES: /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command. */ case SCH_DISKUSAGE: /* END CAB MODIFICATION */ case SCH_COLLATIONS: ... You may have noticed I refer to the disk usage schema table as DISKUSAGE. I do this because the DISK_USAGE token has already been defined in the parser and lexical hash. If I had used DISK_USAGE and issued the command SELECT * FROM DISK_USAGE, I d have gotten an error. This is because the parser associates the DISK_USAGE token with the SHOW command and not with the SELECT command. Now we re at the last set of code changes. You need to add a structure that the information schema functions can use to create the field list for the table. Open the sql_show.cc file and add a new array of type ST_FIELD_INFO as shown in Listing 8-30. Notice that the columns are named the same and have the same types as in the show_disk_usage_command(). Listing 8-30. New Field Information Structure for the DISKUSAGE Schema Table /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command. */ ST_FIELD_INFO disk_usage_fields_info[]= { {"DATABASE", 40, MYSQL_TYPE_STRING, 0, 0, "Database"}, {"SIZE (Kb)", 21 , MYSQL_TYPE_LONG, 0, 0, "Size (Kb)"}, {0, 0, MYSQL_TYPE_STRING, 0, 0, 0} }; /* END CAB MODIFICATION */
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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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The next change you need to make is to add a row in the schema_tables array (also in sql_show.cc). Locate the array and add a statement like that shown in Listing 8-31. This statement tells the information schema functions to associate the table name DISKUSAGE with the field structure disk_usage_fields_info, to create the table by calling create_schema_table(), and to fill the rows of the table with the fill_disk_usage() function. The make_old_format tells the code to make sure the column names are shown. The last four parameters are a pointer to a function to do some additional processing on the table, two index fields, and a bool variable to indicate that it is a hidden table. In the example, I set the pointer to the function to NULL (0); 1 indicates the indexes aren t used, and 0 indicates the table is not hidden. Listing 8-31. Modifications to the schema_tables Array ST_SCHEMA_TABLE schema_tables[]= { ... {"ENGINES", engines_fields_info, create_schema_table, fill_schema_engines, make_old_format, 0, -1, -1, 0}, /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command. */ {"DISKUSAGE", disk_usage_fields_info, create_schema_table, fill_disk_usage, make_old_format, 0, -1, -1, 0}, /* END CAB MODIFICATION */ {"EVENTS", events_fields_info, create_schema_table, fill_schema_events, make_old_format, 0, -1, -1, 0}, ... OK, we re on the home stretch. All that is left is to implement the fill_disk_usage() function. Scroll up from the schema_tables array5 and insert the implementation for the fill_disk_usage() function as shown in Listing 8-32. Listing 8-32. The fill_disk_usage Function Implementation /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command. */ int fill_disk_usage(THD *thd, TABLE_LIST *tables, COND *cond) { TABLE *table= tables->table; CHARSET_INFO *scs= system_charset_info; List<Item> field_list; List<char> dbs; char *db_name; char *path; MY_DIR *dirp;
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5. Remember, if you do not use function declarations you must locate the code for functions in front of the code that references it.
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