Inheritance diagram for Field_str:

Public Member Functions
	Field_str (uchar ptr_arg, uint32 len_arg, uchar null_ptr_arg, uchar null_bit_arg, utype unireg_check_arg, const char field_name_arg, const CHARSET_INFO charset)
Item_result	result_type () const
Item_result	numeric_context_result_type () const
uint	decimals () const
void	make_field (Send_field *field)
type_conversion_status	store (double nr)
type_conversion_status	store (longlong nr, bool unsigned_val)=0
type_conversion_status	store_decimal (const my_decimal *)
type_conversion_status	store (const char to, uint length, const CHARSET_INFO cs)=0
uint	repertoire (void) const
const CHARSET_INFO *	charset (void) const
void	set_charset (const CHARSET_INFO *charset_arg)
enum Derivation	derivation (void) const
virtual void	set_derivation (enum Derivation derivation_arg)
bool	binary () const
uint32	max_display_length ()
virtual bool	str_needs_quotes ()
uint	is_equal (Create_field *new_field)
Protected Attributes
const CHARSET_INFO *	field_charset
enum Derivation	field_derivation
Friends
class	Create_field

Member Function Documentation

uint Field_str::is_equal ( Create_field * new_field ) [virtual]

Whether a field being created is compatible with a existing one.

Used by the ALTER TABLE code to evaluate whether the new definition of a table is compatible with the old definition so that it can determine if data needs to be copied over (table data change).

Reimplemented from Field.

Reimplemented in Field_blob, and Field_varstring.

Item_result Field_str::numeric_context_result_type ( ) const [inline, virtual]

Returns Item_result type of a field when it appears in numeric context such as: SELECT time_column + 1; SELECT SUM(time_column); Examples:

a column of type TIME, DATETIME, TIMESTAMP act as INT.
a column of type TIME(1), DATETIME(1), TIMESTAMP(1) act as DECIMAL with 1 fractional digits.

Reimplemented from Field.

type_conversion_status Field_str::store ( double nr ) [virtual]

Store double value in Field_string or Field_varstring.

Pretty prints double number into field_length characters buffer.

Parameters:

nr number

Implements Field.

Reimplemented in Field_set, Field_enum, Field_blob, Field_varstring, Field_string, and Field_null.

type_conversion_status Field_str::store_decimal ( const my_decimal * d ) [virtual]

Decimal representation of Field_str.

Parameters:

d	value for storing

Note:: Field_str is the base class for fields implemeting [VAR]CHAR, VAR[BINARY], BLOB/TEXT, GEOMETRY. String value should be converted to floating point value according our rules, so we use double to store value of decimal in string.

Todo:: use decimal2string?

Return values:

0	OK
!=0	error

Implements Field.

Reimplemented in Field_null, and Field_longstr.

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

Public Member Functions

Protected Attributes

Friends

Member Function Documentation