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MySQL 5.1: Item_cache Class Reference

Item_cache Class Reference

#include <item.h>

Inheritance diagram for Item_cache:

[legend]Collaboration diagram for Item_cache:

[legend]List of all members.


Public Member Functions
	Item_cache ()
void	set_used_tables (table_map map)
virtual bool	allocate (uint i)
virtual bool	setup (Item *item)
virtual void	store (Item *)=0
enum Type	type () const
table_map	used_tables () const
virtual void	keep_array ()
void	cleanup ()
void	print (String *str)
Static Public Member Functions
static Item_cache *	get_cache (Item_result type)
Protected Attributes
Item *	example
table_map	used_table_map

Detailed Description

Definition at line 2350 of file item.h.

Constructor & Destructor Documentation

Item_cache::Item_cache ( ) [inline]

Definition at line 2356 of file item.h.

References Item::fixed, and Item::null_value.

02356 : example(0), used_table_map(0) {fixed= 1; null_value= 1;}

Member Function Documentation

virtual bool Item_cache::allocate ( uint i ) [inline, virtual]

Reimplemented in Item_cache_row.

Definition at line 2360 of file item.h.

02360 { return 0; }

void Item_cache::cleanup ( ) [inline, virtual]

Reimplemented from Item.

Reimplemented in Item_cache_row.

Definition at line 2376 of file item.h.

Referenced by Item_cache_row::cleanup().

02376 {}

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Item_cache * Item_cache::get_cache ( Item_result type ) [static]

Definition at line 5742 of file item.cc.

References DBUG_ASSERT, DECIMAL_RESULT, INT_RESULT, REAL_RESULT, ROW_RESULT, and STRING_RESULT.

Referenced by sp_rcontext::create_case_expr_holder(), Item_in_optimizer::fix_left(), set_row(), and Item_cache_row::setup().

05743 {
05744   switch (type) {
05745   case INT_RESULT:
05746     return new Item_cache_int();
05747   case REAL_RESULT:
05748     return new Item_cache_real();
05749   case DECIMAL_RESULT:
05750     return new Item_cache_decimal();
05751   case STRING_RESULT:
05752     return new Item_cache_str();
05753   case ROW_RESULT:
05754     return new Item_cache_row();
05755   default:
05756     // should never be in real life
05757     DBUG_ASSERT(0);
05758     return 0;
05759   }
05760 }

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virtual void Item_cache::keep_array ( ) [inline, virtual]

Reimplemented in Item_cache_row.

Definition at line 2374 of file item.h.

Referenced by Item_in_optimizer::keep_top_level_cache().

02374 {}

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void Item_cache::print ( String * str ) [virtual]

Reimplemented from Item.

Definition at line 5763 of file item.cc.

References String::append(), example, Item::print(), and STRING_WITH_LEN.

05764 {
05765   str->append(STRING_WITH_LEN("<cache>("));
05766   if (example)
05767     example->print(str);
05768   else
05769     Item::print(str);
05770   str->append(')');
05771 }

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void Item_cache::set_used_tables ( table_map map ) [inline]

Definition at line 2358 of file item.h.

References used_table_map.

Referenced by Item_in_optimizer::fix_left().

02358 { used_table_map= map; }

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virtual bool Item_cache::setup ( Item * item ) [inline, virtual]

Reimplemented in Item_cache_row.

Definition at line 2361 of file item.h.

References Item::collation, Item::decimals, example, Item::max_length, DTCollation::set(), and Item::unsigned_flag.

Referenced by Item_in_optimizer::fix_left(), set_row(), and Item_cache_row::setup().

02362   {
02363     example= item;
02364     max_length= item->max_length;
02365     decimals= item->decimals;
02366     collation.set(item->collation);
02367     unsigned_flag= item->unsigned_flag;
02368     return 0;
02369   };