MySQL 5.1: Item Class Reference

Item Class Reference

#include <item.h>

Inheritance diagram for Item:

[legend]Collaboration diagram for Item:


Public Types
	FIELD_ITEM = 0
	FUNC_ITEM
	SUM_FUNC_ITEM
	STRING_ITEM
	INT_ITEM
	REAL_ITEM
	NULL_ITEM
	VARBIN_ITEM
	COPY_STR_ITEM
	FIELD_AVG_ITEM
	DEFAULT_VALUE_ITEM
	PROC_ITEM
	COND_ITEM
	REF_ITEM
	FIELD_STD_ITEM
	FIELD_VARIANCE_ITEM
	INSERT_VALUE_ITEM
	SUBSELECT_ITEM
	ROW_ITEM
	CACHE_ITEM
	TYPE_HOLDER
	PARAM_ITEM
	TRIGGER_FIELD_ITEM
	DECIMAL_ITEM
	XPATH_NODESET
	XPATH_NODESET_CMP
	VIEW_FIXER_ITEM
	COND_UNDEF
	COND_OK
	COND_TRUE
	COND_FALSE
	POSTFIX
	PREFIX
enum	Type { FIELD_ITEM = 0, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM, INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM, COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM, PROC_ITEM, COND_ITEM, REF_ITEM, FIELD_STD_ITEM, FIELD_VARIANCE_ITEM, INSERT_VALUE_ITEM, SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM, TYPE_HOLDER, PARAM_ITEM, TRIGGER_FIELD_ITEM, DECIMAL_ITEM, XPATH_NODESET, XPATH_NODESET_CMP, VIEW_FIXER_ITEM }
enum	cond_result { COND_UNDEF, COND_OK, COND_TRUE, COND_FALSE }
enum	traverse_order { POSTFIX, PREFIX }
Public Member Functions
	Item ()
	Item (THD thd, Item item)
virtual	~Item ()
void	set_name (const char str, uint length, CHARSET_INFO cs)
void	rename (char *new_name)
void	init_make_field (Send_field *tmp_field, enum enum_field_types type)
virtual void	cleanup ()
virtual void	make_field (Send_field *field)
Field *	make_string_field (TABLE *table)
virtual bool	fix_fields (THD , Item *)
void	quick_fix_field ()
int	save_in_field_no_warnings (Field *field, bool no_conversions)
virtual int	save_in_field (Field *field, bool no_conversions)
virtual void	save_org_in_field (Field *field)
virtual int	save_safe_in_field (Field *field)
virtual bool	send (Protocol protocol, String str)
virtual bool	eq (const Item *, bool binary_cmp) const
virtual Item_result	result_type () const
virtual Item_result	cast_to_int_type () const
virtual enum_field_types	field_type () const
virtual enum Type	type () const =0
virtual enum_monotonicity_info	get_monotonicity_info () const
virtual double	val_real ()=0
virtual longlong	val_int ()=0
ulonglong	val_uint ()
virtual String *	val_str (String *str)=0
virtual my_decimal *	val_decimal (my_decimal *decimal_buffer)=0
virtual bool	val_bool ()
virtual String *	val_nodeset (String *)
String *	val_string_from_real (String *str)
String *	val_string_from_int (String *str)
String *	val_string_from_decimal (String *str)
my_decimal *	val_decimal_from_real (my_decimal *decimal_value)
my_decimal *	val_decimal_from_int (my_decimal *decimal_value)
my_decimal *	val_decimal_from_string (my_decimal *decimal_value)
longlong	val_int_from_decimal ()
double	val_real_from_decimal ()
virtual Field *	get_tmp_table_field ()
virtual Field *	tmp_table_field (TABLE *t_arg)
virtual const char *	full_name () const
virtual double	val_result ()
virtual longlong	val_int_result ()
virtual String *	str_result (String *tmp)
virtual my_decimal *	val_decimal_result (my_decimal *val)
virtual bool	val_bool_result ()
virtual table_map	used_tables () const
virtual table_map	not_null_tables () const
virtual bool	basic_const_item () const
virtual Item *	new_item ()
virtual cond_result	eq_cmp_result () const
uint	float_length (uint decimals_par) const
virtual uint	decimal_precision () const
int	decimal_int_part () const
virtual bool	const_item () const
virtual bool	const_during_execution () const
virtual void	print (String *str_arg)
void	print_item_w_name (String *)
virtual void	update_used_tables ()
virtual void	split_sum_func (THD thd, Item *ref_pointer_array, List< Item > &fields)
void	split_sum_func2 (THD thd, Item ref_pointer_array, List< Item > &fields, Item *ref, bool skip_registered)
virtual bool	get_date (TIME *ltime, uint fuzzydate)
virtual bool	get_time (TIME *ltime)
virtual bool	get_date_result (TIME *ltime, uint fuzzydate)
virtual bool	is_null ()
virtual void	top_level_item ()
virtual void	set_result_field (Field *field)
virtual bool	is_result_field ()
virtual bool	is_bool_func ()
virtual void	save_in_result_field (bool no_conversions)
virtual void	no_rows_in_result ()
virtual Item *	copy_or_same (THD *thd)
virtual Item *	copy_andor_structure (THD *thd)
virtual Item *	real_item ()
virtual Item *	get_tmp_table_item (THD *thd)
virtual CHARSET_INFO *	compare_collation ()
virtual bool	walk (Item_processor processor, bool walk_subquery, byte *arg)
virtual Item *	transform (Item_transformer transformer, byte *arg)
virtual void	traverse_cond (Cond_traverser traverser, void *arg, traverse_order order)
virtual bool	remove_dependence_processor (byte *arg)
virtual bool	remove_fixed (byte *arg)
virtual bool	cleanup_processor (byte *arg)
virtual bool	collect_item_field_processor (byte *arg)
virtual bool	find_item_in_field_list_processor (byte *arg)
virtual bool	change_context_processor (byte *context)
virtual bool	is_expensive_processor (byte *arg)
virtual bool	register_field_in_read_map (byte *arg)
virtual bool	check_partition_func_processor (byte *bool_arg)
virtual Item *	equal_fields_propagator (byte *arg)
virtual Item *	set_no_const_sub (byte *arg)
virtual Item *	replace_equal_field (byte *arg)
virtual Item *	this_item ()
virtual const Item *	this_item () const
virtual Item **	this_item_addr (THD thd, Item *addr)
virtual uint	cols ()
virtual Item *	el (uint i)
virtual Item **	addr (uint i)
virtual bool	check_cols (uint c)
virtual bool	null_inside ()
virtual void	bring_value ()
Field *	tmp_table_field_from_field_type (TABLE *table, bool fixed_length)
virtual Item_field *	filed_for_view_update ()
virtual Item *	neg_transformer (THD *thd)
virtual Item *	safe_charset_converter (CHARSET_INFO *tocs)
void	delete_self ()
virtual bool	is_splocal ()
virtual Settable_routine_parameter *	get_settable_routine_parameter ()
virtual bool	result_as_longlong ()
Static Public Member Functions
static void *	operator new (size_t size)
static void *	operator new (size_t size, MEM_ROOT *mem_root)
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void ptr, MEM_ROOT mem_root)
static CHARSET_INFO *	default_charset ()
Public Attributes
uint	rsize
String	str_value
my_string	name
my_string	orig_name
Item *	next
uint32	max_length
uint	name_length
uint8	marker
uint8	decimals
my_bool	maybe_null
my_bool	null_value
my_bool	unsigned_flag
my_bool	with_sum_func
my_bool	fixed
my_bool	is_autogenerated_name
DTCollation	collation
my_bool	with_subselect
Private Member Functions
	Item (const Item &)
void	operator= (Item &)

Detailed Description

Definition at line 447 of file item.h.

Member Enumeration Documentation

enum Item::cond_result

Enumerator:

COND_UNDEF
COND_OK
COND_TRUE
COND_FALSE

Definition at line 468 of file item.h.

00468 { COND_UNDEF,COND_OK,COND_TRUE,COND_FALSE };

enum Item::traverse_order

Enumerator:

POSTFIX
PREFIX

Definition at line 470 of file item.h.

00470 { POSTFIX, PREFIX };

enum Item::Type

Enumerator:

FIELD_ITEM
FUNC_ITEM
SUM_FUNC_ITEM
STRING_ITEM
INT_ITEM
REAL_ITEM
NULL_ITEM
VARBIN_ITEM
COPY_STR_ITEM
FIELD_AVG_ITEM
DEFAULT_VALUE_ITEM
PROC_ITEM
COND_ITEM
REF_ITEM
FIELD_STD_ITEM
FIELD_VARIANCE_ITEM
INSERT_VALUE_ITEM
SUBSELECT_ITEM
ROW_ITEM
CACHE_ITEM
TYPE_HOLDER
PARAM_ITEM
TRIGGER_FIELD_ITEM
DECIMAL_ITEM
XPATH_NODESET
XPATH_NODESET_CMP
VIEW_FIXER_ITEM

Definition at line 458 of file item.h.

00458             {FIELD_ITEM= 0, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM,
00459              INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
00460              COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM,
00461              PROC_ITEM,COND_ITEM, REF_ITEM, FIELD_STD_ITEM,
00462              FIELD_VARIANCE_ITEM, INSERT_VALUE_ITEM,
00463              SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM, TYPE_HOLDER,
00464              PARAM_ITEM, TRIGGER_FIELD_ITEM, DECIMAL_ITEM,
00465              XPATH_NODESET, XPATH_NODESET_CMP,
00466              VIEW_FIXER_ITEM};

Constructor & Destructor Documentation

Item::Item ( const Item & ) [private]

Item::Item ( )

Definition at line 296 of file item.cc.

References current_thd, decimals, IN_HAVING, marker, max_length, maybe_null, next, null_value, SELECT_LIST, unsigned_flag, with_subselect, and with_sum_func.

00296           :
00297   rsize(0), name(0), orig_name(0), name_length(0), fixed(0),
00298   is_autogenerated_name(TRUE),
00299   collation(&my_charset_bin, DERIVATION_COERCIBLE)
00300 {
00301   marker= 0;
00302   maybe_null=null_value=with_sum_func=unsigned_flag=0;
00303   decimals= 0; max_length= 0;
00304   with_subselect= 0;
00305 
00306   /* Put item in free list so that we can free all items at end */
00307   THD *thd= current_thd;
00308   next= thd->free_list;
00309   thd->free_list= this;
00310   /*
00311     Item constructor can be called during execution other then SQL_COM
00312     command => we should check thd->lex->current_select on zero (thd->lex
00313     can be uninitialised)
00314   */
00315   if (thd->lex->current_select)
00316   {
00317     enum_parsing_place place= 
00318       thd->lex->current_select->parsing_place;
00319     if (place == SELECT_LIST ||
00320         place == IN_HAVING)
00321       thd->lex->current_select->select_n_having_items++;
00322   }
00323 }

Item::Item	(	THD *	thd,
		Item *	item
	)

Definition at line 330 of file item.cc.

References next.

00330                               :
00331   rsize(0),
00332   str_value(item->str_value),
00333   name(item->name),
00334   orig_name(item->orig_name),
00335   max_length(item->max_length),
00336   marker(item->marker),
00337   decimals(item->decimals),
00338   maybe_null(item->maybe_null),
00339   null_value(item->null_value),
00340   unsigned_flag(item->unsigned_flag),
00341   with_sum_func(item->with_sum_func),
00342   fixed(item->fixed),
00343   collation(item->collation)
00344 {
00345   next= thd->free_list;                         // Put in free list
00346   thd->free_list= this;
00347 }

virtual Item::~Item ( ) [inline, virtual]

Definition at line 510 of file item.h.

References name.

00511   {
00512 #ifdef EXTRA_DEBUG
00513     name=0;
00514 #endif
00515   }             /*lint -e1509 */

Member Function Documentation

virtual Item** Item::addr ( uint i ) [inline, virtual]

Reimplemented in Item_cache_row, Item_row, and Item_singlerow_subselect.

Definition at line 840 of file item.h.

Referenced by Item_in_subselect::row_value_transformer(), Arg_comparator::set_compare_func(), and this_item_addr().

00840 { return 0; }

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

Reimplemented in Item_null, Item_param, Item_int, Item_decimal, Item_float, Item_string, and Item_hex_string.

Definition at line 687 of file item.h.

Referenced by Item_hex_string::eq(), Item_float::eq(), Item_int::eq(), Item_param::eq(), Item_decimal::eq(), Item_string::eq(), find_order_in_list(), fix_fields(), Item_func_set_collation::print(), and resolve_const_item().

00687 { return 0; }

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virtual void Item::bring_value ( ) [inline, virtual]

Reimplemented in Item_cache_row, Item_row, and Item_singlerow_subselect.

Definition at line 845 of file item.h.

Referenced by cmp_item_row::cmp(), Item_cache_row::store(), cmp_item_row::store_value(), and cmp_item_row::store_value_by_template().

00845 {}

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virtual Item_result Item::cast_to_int_type ( ) const [inline, virtual]

Reimplemented in Item_field, and Item_hex_string.

Definition at line 538 of file item.h.

References result_type().

Referenced by Item_func_unsigned::val_int(), and Item_func_signed::val_int().

00538 { return result_type(); }

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virtual bool Item::change_context_processor ( byte * context ) [inline, virtual]

Reimplemented in Item_ident, Item_func_sp, and Item_func_group_concat.

Definition at line 793 of file item.h.

00793 { return 0; }

bool Item::check_cols ( uint c ) [virtual]

Reimplemented in Item_cache_row, Item_row, and Item_singlerow_subselect.

Definition at line 568 of file item.cc.

References ER_OPERAND_COLUMNS, my_error(), and MYF.

Referenced by set_var::check(), Item_func_group_concat::fix_fields(), Item_sum_hybrid::fix_fields(), Item_sum_num::fix_fields(), Item_func_make_set::fix_fields(), Item_cond::fix_fields(), Item_field::fix_outer_field(), set_var::light_check(), mysql_execute_command(), st_table_list::prep_check_option(), JOIN::prepare(), and Item_in_subselect::row_value_transformer().

00569 {
00570   if (c != 1)
00571   {
00572     my_error(ER_OPERAND_COLUMNS, MYF(0), c);
00573     return 1;
00574   }
00575   return 0;
00576 }

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

Reimplemented in Item_name_const, Item_num, Item_field, Item_null, Item_null_result, Item_static_float_func, Item_string, Item_static_string_func, Item_datetime, Item_return_int, Item_hex_string, Item_int_with_ref, Item_bool_rowready_func2, Item_func_not, Item_func_between, Item_func_strcmp, Item_func_ifnull, Item_func_nullif, Item_func_case, Item_func_in, Item_func_isnull, Item_is_not_null_test, Item_func_isnotnull, Item_func_like, Item_cond, Item_func_num1, Item_num_op, Item_func_signed, Item_decimal_typecast, Item_func_int_div, Item_func_exp, Item_func_ln, Item_func_log, Item_func_log2, Item_func_log10, Item_func_sqrt, Item_func_pow, Item_func_acos, Item_func_asin, Item_func_atan, Item_func_cos, Item_func_sin, Item_func_tan, Item_func_sign, Item_func_units, Item_func_min_max, Item_func_length, Item_func_char_length, Item_func_coercibility, Item_func_locate, Item_func_ascii, Item_func_ord, Item_func_find_in_set, Item_func_bit, Item_func_bit_count, Item_func_inet_aton, Item_func_md5, Item_func_sha, Item_func_concat, Item_func_reverse, Item_str_conv, Item_func_substr, Item_func_substr_index, Item_func_trim, Item_func_soundex, Item_func_rpad, Item_func_lpad, Item_func_conv, Item_func_hex, Item_func_unhex, Item_func_binary, Item_func_inet_ntoa, Item_func_quote, Item_func_conv_charset, Item_func_charset, Item_func_collation, Item_func_crc32, Item_func_uncompressed_length, Item_func_period_add, Item_func_period_diff, Item_func_to_days, Item_func_dayofmonth, Item_func_month, Item_func_dayofyear, Item_func_hour, Item_func_minute, Item_func_quarter, Item_func_second, Item_func_week, Item_func_yearweek, Item_func_year, Item_func_weekday, Item_func_unix_timestamp, Item_func_time_to_sec, Item_func_from_days, Item_func_date_format, Item_func_from_unixtime, Item_func_sec_to_time, Item_date_add_interval, Item_extract, Item_typecast_maybe_null, Item_char_typecast, Item_func_makedate, Item_func_add_time, Item_func_maketime, Item_func_microsecond, Item_func_timestamp_diff, Item_func_str_to_date, and Item_func_xml_extractvalue.

Definition at line 817 of file item.h.

References FALSE.

00818   { *(bool *)bool_arg= FALSE; return 0; }

void Item::cleanup ( ) [virtual]

Reimplemented in Item_ident, Item_field, Item_null, Item_int, Item_decimal, Item_float, Item_string, Item_hex_string, Item_result_field, Item_ref, Item_trigger_field, Item_cache, Item_cache_row, Item_in_optimizer, Item_func_in, Item_func_like, Item_func_match, Item_func_sp, Item_row, Item_subselect, Item_singlerow_subselect, Item_maxmin_subselect, Item_sum_distinct, Item_sum_count, Item_sum_count_distinct, Item_sum_hybrid, Item_func_group_concat, and Item_func_convert_tz.

Definition at line 373 of file item.cc.

References DBUG_ENTER, DBUG_VOID_RETURN, fixed, marker, name, and orig_name.

Referenced by Item_row::cleanup(), Item_result_field::cleanup(), Item_trigger_field::cleanup(), Item_ident::cleanup(), cleanup_items(), cleanup_processor(), delete_self(), and mysql_select().

00374 {
00375   DBUG_ENTER("Item::cleanup");
00376   fixed=0;
00377   marker= 0;
00378   if (orig_name)
00379     name= orig_name;
00380   DBUG_VOID_RETURN;
00381 }

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Item Class Reference

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Private Member Functions

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation