Item_extract Class Reference

Inheritance diagram for Item_extract:

List of all members.

Public Member Functions
	Item_extract (interval_type type_arg, Item *a)
longlong	val_int ()
enum Functype	functype () const
const char *	func_name () const
void	fix_length_and_dec ()
bool	eq (const Item *item, bool binary_cmp) const
virtual void	print (String *str, enum_query_type query_type)
bool	check_partition_func_processor (uchar *int_arg)
bool	check_valid_arguments_processor (uchar *int_arg)
Public Attributes
const interval_type	int_type

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Member Function Documentation

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

This function is called when:

• Comparing items in the WHERE clause (when doing where optimization)
• When trying to find an ORDER BY/GROUP BY item in the SELECT part
• When matching fields in multiple equality objects (Item_equal)

Reimplemented from Item_func.

void Item_extract::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_timefunc.h
• item_timefunc.cc