Item_ref_null_helper Class Reference

Inheritance diagram for Item_ref_null_helper:

List of all members.

Public Member Functions
	Item_ref_null_helper (Name_resolution_context *context_arg, Item_in_subselect *master, Item **item, const char *table_name_arg, const char *field_name_arg)
double	val_real ()
longlong	val_int ()
longlong	val_time_temporal ()
longlong	val_date_temporal ()
String *	val_str (String *s)
my_decimal *	val_decimal (my_decimal *)
bool	val_bool ()
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
virtual void	print (String *str, enum_query_type query_type)
table_map	used_tables () const
Protected Attributes
Item_in_subselect *	owner

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Member Function Documentation

void Item_ref_null_helper::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_ref.

bool Item_ref_null_helper::val_bool

(

)

[virtual]

Todo:

Make this functions class dependent

Reimplemented from Item_ref.

longlong Item_ref_null_helper::val_date_temporal

(

)

[virtual]

Return date value of item in packed longlong format.

Reimplemented from Item_ref.

longlong Item_ref_null_helper::val_time_temporal

(

)

[virtual]

Return time value of item in packed longlong format.

Reimplemented from Item_ref.

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

• item.h
• item.cc