Item_func_isnotnull Class Reference

Inheritance diagram for Item_func_isnotnull:

List of all members.

Public Member Functions
	Item_func_isnotnull (Item *a)
longlong	val_int ()
enum Functype	functype () const
void	fix_length_and_dec ()
const char *	func_name () const
optimize_type	select_optimize () const
table_map	not_null_tables () const
Item *	neg_transformer (THD *thd)
virtual void	print (String *str, enum_query_type query_type)
const CHARSET_INFO *	compare_collation ()
void	top_level_item ()

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Member Function Documentation

Item * Item_func_isnotnull::neg_transformer

(

THD *

thd

)

[virtual]

a IS NOT NULL -> a IS NULL.

Reimplemented from Item.

void Item_func_isnotnull::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_func.

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

• item_cmpfunc.h
• item_cmpfunc.cc