Item_ident Class Reference

Inheritance diagram for Item_ident:

List of all members.

Public Member Functions
	Item_ident (Name_resolution_context *context_arg, const char *db_name_arg, const char *table_name_arg, const char *field_name_arg)
	Item_ident (THD *thd, Item_ident *item)
const char *	full_name () const
virtual void	fix_after_pullout (st_select_lex *parent_select, st_select_lex *removed_select)
void	cleanup ()
bool	remove_dependence_processor (uchar *arg)
virtual void	print (String *str, enum_query_type query_type)
virtual bool	change_context_processor (uchar *cntx)
Public Attributes
Name_resolution_context *	context
const char *	db_name
const char *	table_name
const char *	field_name
bool	alias_name_used
uint	cached_field_index
TABLE_LIST *	cached_table
st_select_lex *	depended_from
Protected Attributes
const char *	orig_db_name
const char *	orig_table_name
const char *	orig_field_name
Friends
bool	insert_fields (THD *thd, Name_resolution_context *context, const char *db_name, const char *table_name, List_iterator< Item > *it, bool any_privileges)

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Constructor & Destructor Documentation

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

Constructor used by Item_field & Item_*_ref (see Item comment)

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Member Function Documentation

void Item_ident::fix_after_pullout	(	st_select_lex *	parent_select,
		st_select_lex *	removed_select
	)		[virtual]

Fix after tables have been moved from one select_lex level to the parent level, e.g by semijoin conversion. Basically re-calculate all attributes dependent on the tables.

Parameters:

parent_select	select_lex that tables are moved to.
removed_select	select_lex that tables are moved away from, child of parent_select.

Reimplemented from Item.

Reimplemented in Item_outer_ref, and Item_ref.

void Item_ident::print	(	String *	str,
		enum_query_type	query_type
	)		[virtual]

This method is used for to:

• to generate a view definition query (SELECT-statement);
• to generate a SQL-query for EXPLAIN EXTENDED;
• to generate a SQL-query to be shown in INFORMATION_SCHEMA;
• debug.

For more information about view definition query, INFORMATION_SCHEMA query and why they should be generated from the Item-tree,

See also:

mysql_register_view().

Reimplemented from Item.

Reimplemented in Item_trigger_field, Item_insert_value, Item_default_value, Item_ref_null_helper, Item_ref, Item_field, and Item_aggregate_ref.

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

• item.h
• item.cc