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Windows users will encounter problems with some definitions missing from the compiled sql_yacc.cpp file. If you get errors about the yyerror missing or MYSQLparse missing, open the sql_yacc.cpp file, add the statements shown in Listing 8-24, and rerun the Bison command to generate the y.tab.c and y.tab.h files. Listing 8-24. Missing #define Statements /* If NAME_PREFIX is specified substitute the variables and functions names. */ #define yyparse MYSQLparse #define yylex MYSQLlex #define yyerror MYSQLerror #define yylval MYSQLlval #define yychar MYSQLchar #define yydebug MYSQLdebug #define yynerrs MYSQLnerrs Once the sql_yacc.cc and sql_yacc.h files are correct, generate the lexical hash by running this command: gen_lex_hash > lex_hash.h Everything is now set for you to compile the server. Since you have modified a number of the key header files, you may encounter longer-than-normal compilation times. 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 8-25 shows an example of the SHOW DISK_USAGE command. Listing 8-25. Example Execution of the SHOW DISK_USAGE Command mysql> SHOW DISK_USAGE; +----------+-----------+ | Database | Size (Kb) | +----------+-----------+ | test_row | 1024 | +----------+-----------+ 1 row in set (0.00 sec)

Next, use dscl to search for a computer record with that value for the ENetAddress:

CslaDataSourceView doesn t actually do much work. Rather, it calls methods on CslaDataSource to have it raise the four data access methods. The event handlers in the page then do the real work. For instance, here s the ExecuteInsert() method: protected override int ExecuteInsert( IDictionary values) { // tell the page to insert the object InsertObjectArgs args = new InsertObjectArgs(values); _owner.OnInsertObject(args); return args.RowsAffected; } An instance of InsertObjectArgs is created and initialized with the values list. This is a list of name/value pairs for all the data elements from the web page (provided by ASP.NET), which presumably correspond to properties on the business object. Then the OnInsertObject() method on CslaDataSource is called. That method simply raises the InsertObject method so the web form can handle the event to create a new business object and insert it into the database.

OK, now that everything is working, open the sql_show.cc file and add the actual code for the SHOW DISK_USAGE command as shown in Listing 8-26. Listing 8-26. The Final show_disk_usage_command Source Code /* This section adds the code to call the new SHOW DISK_USAGE command. */ bool show_disk_usage_command(THD *thd) { List<Item> field_list; List<char> dbs; char *db_name; char *path; MY_DIR *dirp; FILEINFO *file; longlong fsizes = 0; longlong lsizes = 0; Protocol *protocol= thd->protocol; DBUG_ENTER("show_disk_usage"); /* send the fields "Database" and "Size" */ field_list.push_back(new Item_empty_string("Database",50)); field_list.push_back(new Item_int("Size (Kb)",(longlong) 1,21)); if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(TRUE); /* 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; lsizes = 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 */ protocol->prepare_for_resend(); protocol->store("InnoDB TableSpace", system_charset_info); protocol->store((longlong)fsizes);

The ExecuteUpdate() and ExecuteDelete() methods are quite similar, but ExecuteSelect() is a bit more complex: protected override System.Collections.IEnumerable ExecuteSelect(DataSourceSelectArguments arguments) { // get the object from the page SelectObjectArgs args = new SelectObjectArgs(); _owner.OnSelectObject(args); object obj = args.BusinessObject; object result; if (arguments.RetrieveTotalRowCount) { if (obj == null) result = 0; else if (obj is IList) result = ((IList)obj).Count; else if (obj is IEnumerable) { IEnumerable temp = (IEnumerable)obj; int count = 0; foreach (object item in temp) count++; result = count; } else result = 1; } else result = obj; // if the result isn't IEnumerable then // wrap it in a collection if (!(result is IEnumerable)) { ArrayList list = new ArrayList(); list.Add(result); result = list; } // now return the object as a result return (IEnumerable)result; } The first bit of complexity comes because ExecuteSelect() can be called either to retrieve a data source or to retrieve the number of rows in the data source. If it is asked to retrieve the row count, the method still must call OnSelectObject() on CslaDataSource so the UI event handler can return the business object: // get the object from the page SelectObjectArgs args = new SelectObjectArgs(); _owner.OnSelectObject(args); object obj = args.BusinessObject;