Item_float Class Reference

Inheritance diagram for Item_float:

List of all members.

Public Member Functions
	Item_float (const char *str_arg, uint length)
	Item_float (const Name_string name_arg, double val_arg, uint decimal_par, uint length)
	Item_float (double value_par, uint decimal_par)
type_conversion_status	save_in_field (Field *field, bool no_conversions)
enum Type	type () const
enum_field_types	field_type () const
double	val_real ()
longlong	val_int ()
String *	val_str (String *)
my_decimal *	val_decimal (my_decimal *)
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
bool	get_time (MYSQL_TIME *ltime)
bool	basic_const_item () const
Item *	clone_item ()
Item_num *	neg ()
virtual void	print (String *str, enum_query_type query_type)
bool	eq (const Item *, bool binary_cmp) const
Public Attributes
double	value

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Constructor & Destructor Documentation

Item_float::Item_float	(	const char *	str_arg,
		uint	length
	)

This function is only called during parsing:

• when parsing SQL query from sql_yacc.yy
• when parsing XPath query from item_xmlfunc.cc We will signal an error if value is not a true double value (overflow): eng: Illegal s '%-.192s' value found during parsing

Note: str_arg does not necessarily have to be a null terminated string, e.g. it is NOT when called from item_xmlfunc.cc or sql_yacc.yy.

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Member Function Documentation

bool Item_float::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_float::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_static_float_func.

type_conversion_status Item_float::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