Field_num Class Reference

Inheritance diagram for Field_num:

List of all members.

Public Member Functions
	Field_num (uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, uchar null_bit_arg, utype unireg_check_arg, const char *field_name_arg, uint8 dec_arg, bool zero_arg, bool unsigned_arg)
Item_result	result_type () const
enum Derivation	derivation (void) const
uint	repertoire (void) const
const CHARSET_INFO *	charset (void) const
void	prepend_zeros (String *value)
void	add_zerofill_and_unsigned (String &res) const
uint	decimals () const
bool	eq_def (Field *field)
type_conversion_status	store_decimal (const my_decimal *)
type_conversion_status	store_time (MYSQL_TIME *ltime, uint8 dec)
my_decimal *	val_decimal (my_decimal *)
bool	get_date (MYSQL_TIME *ltime, uint fuzzydate)
bool	get_time (MYSQL_TIME *ltime)
uint	is_equal (Create_field *new_field)
uint	row_pack_length () const
uint32	pack_length_from_metadata (uint field_metadata)
type_conversion_status	check_int (const CHARSET_INFO *cs, const char *str, int length, const char *int_end, int error)
type_conversion_status	get_int (const CHARSET_INFO *cs, const char *from, uint len, longlong *rnd, ulonglong unsigned_max, longlong signed_min, longlong signed_max)
Public Attributes
const uint8	dec
bool	zerofill
bool	unsigned_flag
Friends
class	Create_field

---

Constructor & Destructor Documentation

Field_num::Field_num	(	uchar *	ptr_arg,
		uint32	len_arg,
		uchar *	null_ptr_arg,
		uchar	null_bit_arg,
		utype	unireg_check_arg,
		const char *	field_name_arg,
		uint8	dec_arg,
		bool	zero_arg,
		bool	unsigned_arg
	)

Numeric fields base class constructor.

---

Member Function Documentation

type_conversion_status Field_num::check_int	(	const CHARSET_INFO *	cs,
		const char *	str,
		int	length,
		const char *	int_end,
		int	error
	)

Test if given number is a int.

Todo:

Make this multi-byte-character safe

Parameters:

str	String to test
length	Length of 'str'
int_end	Pointer to char after last used digit
cs	Character set

Note:

This is called after one has called strntoull10rnd() function.

Returns:

TYPE_OK, TYPE_ERR_BAD_VALUE or TYPE_WARN_TRUNCATED

bool Field_num::eq_def

(

Field *

field

)

[virtual]

Returns:

returns 1 if the fields are equally defined

Reimplemented from Field.

uint Field_num::is_equal

(

Create_field *

new_field

)

[virtual]

Check whether two numeric fields can be considered 'equal' for table alteration purposes. Fields are equal if they are of the same type and retain the same pack length.

Reimplemented from Field.

Reimplemented in Field_new_decimal.

type_conversion_status Field_num::store_decimal

(

const my_decimal *

val

)

[virtual]

Storing decimal in integer fields.

Parameters:

val	value for storing

Note:

This method is used by all integer fields, real/decimal redefine it

Return values:

TYPE_OK	Storage of value went fine without warnings or errors
!TYPE_OK	Warning/error as indicated by type_conversion_status enum value

Implements Field.

Reimplemented in Field_new_decimal, and Field_real.

type_conversion_status Field_num::store_time	(	MYSQL_TIME *	ltime,
		uint8	dec_arg
	)		[virtual]

Store MYSQL_TIME value with the given amount of decimal digits into a field.

Note, the "dec" parameter represents number of digits of the Item that previously created the MYSQL_TIME value. It's needed when we store the value into a CHAR/VARCHAR/TEXT field to display the proper amount of fractional digits. For other field types the "dec" value does not matter and is ignored.

Parameters:

ltime	Time, date or datetime value.
dec	Number of decimals in ltime.

Return values:

false	on success
true	on error

This is called when storing a date in a string.

Note:

Needs to be changed if/when we want to support different time formats.

Reimplemented from Field.

Reimplemented in Field_year, Field_new_decimal, and Field_real.

my_decimal * Field_num::val_decimal

(

my_decimal *

decimal_value

)

[virtual]

Return decimal value of integer field.

Parameters:

decimal_value

buffer for storing decimal value

Note:

This method is used by all integer fields, real/decimal redefine it. All longlong values fit in our decimal buffer which cal store 8*9=72 digits of integer number

Returns:

pointer to decimal buffer with value of field

Implements Field.

Reimplemented in Field_new_decimal, and Field_real.

---

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

• field.h
• field.cc