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CHAPTER 11 QUERY OPTIMIZATION
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The Field Class
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The Field class contains all of the attributes and methods for creating, assigning values to, and manipulating fields (or attributes) for the tables in the database. The Field class is defined in the /sql/field.h file and implemented in the /sql/field.cc file. The Field class is actually a base from which several types of fields are derived. These derived classes are named Field_XXX and can be found in several places within the MySQL source code. Since it is only a base class,12 there are many methods in the class that are intended to be overwritten by the derived class (they re defined as virtual). However, many of the derived classes have the same set of basic attributes and methods. Table 11-2 lists the attributes and methods that you will encounter in working with the DBXP source code. For a detailed examination of the Field class, see the field.h file.
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Table 11-2. The Field Class
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ptr null_ptr table_name field_name field_length is_null() move_field() store() val_str() val_int() result_type() cmp()
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A pointer to the field within the record buffer. A pointer to a byte (or bytes) in the record buffer that indicates which attributes can contain NULL. The table name associated with this field. The attribute name for this field. The length of the field. Indicates the number of bytes that can be stored. Checks to see if the field is NULL. Changes the pointer of the field in memory to point to a different location. A series of overloaded methods used to store values into the fields. Gets the value of the field as a string. Gets the value of the field as an integer. Gets the data type of the field. Returns the comparison result of the field with the value passed.
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There are three types of iterators in the MySQL source code. You have already seen these iterators while working with the code in s 7 and 8. Iterators are special constructs that make it easy to create and navigate a list of objects and are typically presented as either linked lists or arrays. The iterators in MySQL are implemented as template classes, which take as a parameter the type of the data on which the list operates. The MySQL iterators are linked lists, but some
12. It isn t a true abstract class because it contains some methods that are defined in the source code. A true abstract class defines all methods as virtual and therefore are used as interfaces rather than base classes.
CHAPTER 11 QUERY OPTIMIZATION
behave more like queues and stacks. The following sections describe some of the available iterator classes in MySQL. These iterators are defined in the /sql/sql_list.h header file. template <> class List The List template class is implemented as a queue or stack with methods for pushing items onto the back of the list using the push_back() method or on the front of the list using the push_front() method. Items can be retrieved using the pop() method or deleted by using the remove() method. You can loop through the list by using the next attribute of the data item, but the list is normally used to form a linked list of items (e.g., List<Item> item_list), then one of the List_iterator classes is used to loop through the list quickly. This class is derived from the base_list class (also defined in /sql/sql_list.h). template <> class List_iterator The List_iterator class is implemented as a linked list with methods for moving through the list using the overloaded ++ operator. Items can be retrieved using the ref() method or deleted by using the remove() method. The list can be restarted from the front by issuing the rewind() method. This class is derived from the base_list class (also defined in /sql/sql_list.h). template <> class List_iterator_fast The List_iterator_fast class is essentially the same as the List_iterator class, but optimized for fast-forward traversal. Implemented as a linked list with methods for moving through the list using the overloaded ++ operator. Items can be retrieved using the ref() method or deleted by using the remove() method. This class is derived from the base_list class (also defined in /sql/sql_list.h). Examples Using the iterators is easy. If you want to use a list to manipulate items, a simple list like the List<Item_field> would be the best choice. However, if you want to loop through a list of fields quickly, you can create a list iterator as either a List_iterator<Item_field> or a List_ iterator_fast<Item_field>. Examples of loop structures are shown in Listing 11-4. Listing 11-4. Example Iterators /* create a list and populate with some items */ List<Item> item_list; item_list.push_back(new Item_int((int32) join->select_lex->select_number)); item_list.push_back(new Item_string(join->select_lex->type, strlen(join->select_lex->type), cs)); item_list.push_back(new Item_string(message,strlen(message),cs)); ../* start a basic list iterator to iterate through the item_list */ List_iterator<Item_field> item_list_it(*item_list);
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