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MySQL 5.1: Item_null Class Reference

Item_null Class Reference

#include <item.h>

Inheritance diagram for Item_null:

[legend]Collaboration diagram for Item_null:

[legend]List of all members.


Public Member Functions
	Item_null (char *name_par=0)
enum Type	type () const
bool	eq (const Item *item, bool binary_cmp) const
double	val_real ()
longlong	val_int ()
String *	val_str (String *str)
my_decimal *	val_decimal (my_decimal *)
int	save_in_field (Field *field, bool no_conversions)
int	save_safe_in_field (Field *field)
bool	send (Protocol protocol, String str)
enum Item_result	result_type () const
enum_field_types	field_type () const
void	cleanup ()
bool	basic_const_item () const
Item *	new_item ()
bool	is_null ()
void	print (String *str)
Item *	safe_charset_converter (CHARSET_INFO *tocs)
bool	check_partition_func_processor (byte *bool_arg)

Detailed Description

Definition at line 1333 of file item.h.

Constructor & Destructor Documentation

Item_null::Item_null ( char * name_par = 0 ) [inline]

Definition at line 1336 of file item.h.

References Item::collation, DERIVATION_IGNORABLE, Item::fixed, Item::max_length, Item::maybe_null, my_charset_bin, Item::name, Item::null_value, DTCollation::set(), and TRUE.

Referenced by new_item().

01337   {
01338     maybe_null= null_value= TRUE;
01339     max_length= 0;
01340     name= name_par ? name_par : (char*) "NULL";
01341     fixed= 1;
01342     collation.set(&my_charset_bin, DERIVATION_IGNORABLE);
01343   }

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Member Function Documentation

bool Item_null::basic_const_item ( ) const [inline, virtual]

Reimplemented from Item.

Definition at line 1357 of file item.h.

01357 { return 1; }

bool Item_null::check_partition_func_processor ( byte * bool_arg ) [inline, virtual]

Reimplemented from Item.

Reimplemented in Item_null_result.

Definition at line 1362 of file item.h.

01362 { return 0;}

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

Reimplemented from Item.

Definition at line 1356 of file item.h.

01356 {}

bool Item_null::eq	(	const Item *	item,
		bool	binary_cmp
	)			const `[virtual]`

Reimplemented from Item.

Definition at line 2160 of file item.cc.

References type(), and Item::type().

02161 { return item->type() == type(); }

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enum_field_types Item_null::field_type ( ) const [inline, virtual]

Reimplemented from Item.

Definition at line 1354 of file item.h.

References MYSQL_TYPE_NULL.

01354 { return MYSQL_TYPE_NULL; }

bool Item_null::is_null ( ) [inline, virtual]

Reimplemented from Item.

Definition at line 1359 of file item.h.

01359 { return 1; }

Item* Item_null::new_item ( ) [inline, virtual]

Reimplemented from Item.

Definition at line 1358 of file item.h.

References Item_null(), and Item::name.

01358 { return new Item_null(name); }

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void Item_null::print ( String * str ) [inline, virtual]

Reimplemented from Item.

Definition at line 1360 of file item.h.

References String::append(), and STRING_WITH_LEN.

01360 { str->append(STRING_WITH_LEN("NULL")); }

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enum Item_result Item_null::result_type ( ) const [inline, virtual]

Reimplemented from Item.

Definition at line 1353 of file item.h.

References STRING_RESULT.

01353 { return STRING_RESULT; }

Item * Item_null::safe_charset_converter ( CHARSET_INFO * tocs ) [virtual]

Reimplemented from Item.

Definition at line 2193 of file item.cc.

References Item::collation, and DTCollation::set().

02194 {
02195   collation.set(tocs);
02196   return this;
02197 }

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int Item_null::save_in_field	(	Field *	field,
		bool	no_conversions
	)			`[virtual]`

Reimplemented from Item.

Definition at line 4151 of file item.cc.

References set_field_to_null_with_conversions().

Referenced by Item_null_result::save_in_result_field().

04152 {
04153   return set_field_to_null_with_conversions(field, no_conversions);
04154 }

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int Item_null::save_safe_in_field ( Field * field ) [virtual]

Reimplemented from Item.

Definition at line 4169 of file item.cc.

References set_field_to_null().

04170 {
04171   return set_field_to_null(field);
04172 }

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bool Item_null::send	(	Protocol *	protocol,
		String *	str
	)			`[virtual]`

Reimplemented from Item.

Definition at line 4532 of file item.cc.

References Protocol::store_null().

04533 {
04534   return protocol->store_null();
04535 }

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enum Type Item_null::type ( ) const [inline, virtual]

Implements Item.

Definition at line 1344 of file item.h.

References Item::NULL_ITEM.

Referenced by eq().

01344 { return NULL_ITEM; }

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my_decimal * Item_null::val_decimal ( my_decimal * ) [virtual]

Implements Item.

Definition at line 2187 of file item.cc.

02188 {
02189   return 0;
02190 }

longlong Item_null::val_int ( ) [virtual]

Implements Item.

Definition at line 2171 of file item.cc.

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

02172 {
02173   // following assert is redundant, because fixed=1 assigned in constructor
02174   DBUG_ASSERT(fixed == 1);
02175   null_value=1;
02176   return 0;
02177 }

double Item_null::val_real ( ) [virtual]

Implements Item.

Definition at line 2164 of file item.cc.

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

02165 {
02166   // following assert is redundant, because fixed=1 assigned in constructor
02167   DBUG_ASSERT(fixed == 1);
02168   null_value=1;
02169   return 0.0;
02170 }

String * Item_null::val_str ( String * str ) [virtual]

Implements Item.

Definition at line 2179 of file item.cc.

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

02180 {
02181   // following assert is redundant, because fixed=1 assigned in constructor
02182   DBUG_ASSERT(fixed == 1);
02183   null_value=1;
02184   return 0;
02185 }

The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item.h
mysql/src/5.1-dbg/sql/item.cc

Generated on Sat Sep 9 21:51:37 2006 for MySQL 5.1 by

1.4.7

The world's most popular open source database

Item_null Class Reference

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation