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You also need to add the new case statement for the DBXP explain command. The statements are similar to the case statement for the SELECT DBXP command. Listing 10-23 shows the new case statement added. Listing 10-23. Modifications to the Parser Switch Statement /* BEGIN DBXP MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SELECT DBXP command. */ case SQLCOM_DBXP_SELECT: { res = DBXP_select_command(thd); if (res) goto error; break; } case SQLCOM_DBXP_EXPLAIN_SELECT: { res = DBXP_explain_select_command(thd); if (res) goto error; break; } /* END DBXP MODIFICATION */

Child objects can optionally be created through data binding, in which case the addition is handled by overriding the AddNewCore() method in the collection class.

As with the root objects, you may or may not need to load default values from the database when creating a child object.

The EXPLAIN SELECT DBXP command shows the query path as a tree printed out within the confines of character text. The EXPLAIN code is executed in a function named show_plan in the sql_DBXP_parse.cc file. A helper function named write_printf is used to make the show_plan code easier to read. Listings 10-24 and 10-25 show the completed code for both of these methods. Listing 10-24. Adding a Function to Capture the Protocol Store and Write Statements /* Write to vio with printf. SYNOPSIS write_printf() Protocol *p char *first char *last

If you don t need to retrieve default values from the database, you could have the collection object create the child object directly, using the new keyword. For consistency, however, it s better to stick with the factory method approach, so that all objects are created the same way.

This import is responsible for all of the magic here. While we could import all of Foundation, we ll import just the portion we need: NSMutableDictionary.

RETURN VALUE Success = 0 Failed = 1 */ int write_printf(Protocol *p, char *first, char *last) { char *str = (char *)my_malloc(256, MYF(MY_ZEROFILL | MY_WME)); DBUG_ENTER("write_printf"); strcpy(str, first); strcat(str, last); p->prepare_for_resend(); p->store(str, system_charset_info); p->write(); my_free((gptr)str, MYF(0)); DBUG_RETURN(0); } Notice that the write_printf code calls the protocol->store and protocol->write functions to write a line of the drawing to the client. I ll let you explore the show_plan source code shown in Listing 10-25 to see how it works. I ll show you an example of the code executing in the next section. The code uses a postorder traversal to generate the query plan from the query tree starting at the root. Add these methods to the sql_DBXP_parse.cc file. Listing 10-25. The show_plan Source Code /* Show Query Plan SYNOPSIS show_plan() Protocol *p query_node *Root query_node *qn bool print_on_right

The steps to create a child object that doesn t need to load itself with default values from the database are as follows: 1. The factory method (internal scope) is called. 2. The factory method creates the object locally by using the new keyword and possibly passing parameter values. 3. The child object does any initialization in the constructor method. 4. The child object is returned. 5. From the child object s perspective, only one method is called, as follows: Any constructor This is illustrated in Figure 7-2.

the MySQL protocol class the root node of the query tree the starting node to be operated on. indicates the printing should tab to the right of the display.