Item_decimal Class Reference

Inheritance diagram for Item_decimal:

List of all members.

Public Member Functions
	Item_decimal (const char *str_arg, uint length, const CHARSET_INFO *charset)
	Item_decimal (const Name_string &name_arg, const my_decimal *val_arg, uint decimal_par, uint length)
	Item_decimal (my_decimal *value_par)
	Item_decimal (longlong val, bool unsig)
	Item_decimal (double val, int precision, int scale)
	Item_decimal (const uchar *bin, int precision, int scale)
enum Type	type () const
enum Item_result	result_type () const
enum_field_types	field_type () const
longlong	val_int ()
double	val_real ()
String *	val_str (String *)
my_decimal *	val_decimal (my_decimal *val)
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
bool	get_time (MYSQL_TIME *ltime)
type_conversion_status	save_in_field (Field *field, bool no_conversions)
bool	basic_const_item () const
Item *	clone_item ()
virtual void	print (String *str, enum_query_type query_type)
Item_num *	neg ()
uint	decimal_precision () const
bool	eq (const Item *, bool binary_cmp) const
void	set_decimal_value (my_decimal *value_par)
bool	check_partition_func_processor (uchar *bool_arg)
Protected Attributes
my_decimal	decimal_value

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Member Function Documentation

bool Item_decimal::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.

void Item_decimal::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.

type_conversion_status Item_decimal::save_in_field	(	Field *	field,
		bool	no_conversions
	)		[virtual]

Save a temporal value in packed longlong format into a Field. Used in optimizer.

Parameters:

OUT	field The field to set the value to.

Return values:

0	On success.
>0	In error.

Reimplemented from Item.

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

• item.h
• item.cc