Inheritance diagram for Field_blob:

Public Member Functions
	Field_blob (uchar ptr_arg, uchar null_ptr_arg, uchar null_bit_arg, enum utype unireg_check_arg, const char field_name_arg, TABLE_SHARE share, uint blob_pack_length, const CHARSET_INFO *cs)
	Field_blob (uint32 len_arg, bool maybe_null_arg, const char field_name_arg, const CHARSET_INFO cs)
	Field_blob (uint32 len_arg, bool maybe_null_arg, const char field_name_arg, const CHARSET_INFO cs, bool set_packlength)
	Field_blob (uint32 packlength_arg)
enum_field_types	type () const
bool	match_collation_to_optimize_range () const
enum ha_base_keytype	key_type () const
type_conversion_status	store (const char to, uint length, const CHARSET_INFO charset)
type_conversion_status	store (double nr)
type_conversion_status	store (longlong nr, bool unsigned_val)
double	val_real (void)
longlong	val_int (void)
String *	val_str (String , String )
my_decimal *	val_decimal (my_decimal *)
int	cmp_max (const uchar , const uchar , uint max_length)
int	cmp (const uchar a, const uchar b)
int	cmp (const uchar a, uint32 a_length, const uchar b, uint32 b_length)
int	cmp_binary (const uchar a, const uchar b, uint32 max_length=~0L)
int	key_cmp (const uchar , const uchar )
int	key_cmp (const uchar *str, uint length)
uint32	key_length () const
void	make_sort_key (uchar *buff, uint length)
uint32	pack_length () const
uint32	pack_length_no_ptr () const
uint	row_pack_length () const
uint32	sort_length () const
virtual uint32	max_data_length () const
type_conversion_status	reset (void)
void	reset_fields ()
uint32	get_field_buffer_size (void)
void	store_length (uchar *i_ptr, uint i_packlength, uint32 i_number)
void	store_length (uint32 number)
uint32	get_length (uint row_offset=0)
uint32	get_length (const uchar *ptr, uint packlength, bool low_byte_first)
uint32	get_length (const uchar *ptr_arg)
void	put_length (uchar *pos, uint32 length)
void	get_ptr (uchar **str)
void	get_ptr (uchar **str, uint row_offset)
void	set_ptr (uchar length, uchar data)
void	set_ptr_offset (my_ptrdiff_t ptr_diff, uint32 length, uchar *data)
void	set_ptr (uint32 length, uchar *data)
uint	get_key_image (uchar *buff, uint length, imagetype type)
void	set_key_image (const uchar *buff, uint length)
void	sql_type (String &str) const
bool	copy ()
Field_blob *	clone (MEM_ROOT *mem_root) const
Field_blob *	clone () const
virtual uchar *	pack (uchar to, const uchar from, uint max_length, bool low_byte_first)
virtual const uchar *	unpack (uchar to, const uchar from, uint param_data, bool low_byte_first)
uint	packed_col_length (const uchar *col_ptr, uint length)
uint	max_packed_col_length (uint max_length)
void	free ()
void	clear_temporary ()
bool	has_charset (void) const
uint32	max_display_length ()
uint32	char_length ()
uint	is_equal (Create_field *new_field)
bool	in_read_set ()
bool	in_write_set ()
Static Public Member Functions
static void	store_length (uchar *i_ptr, uint i_packlength, uint32 i_number, bool low_byte_first)
Protected Member Functions
void	store_ptr_and_length (const char *from, uint32 length)
Protected Attributes
uint	packlength
String	value
Friends
type_conversion_status	field_conv (Field to, Field from)

Member Function Documentation

uint32 Field_blob::char_length ( ) [virtual]

maximum possible character length for blob.

This method is used in Item_field::set_field to calculate max_length for Item.

For example: CREATE TABLE t2 SELECT CONCAT(tinyblob_utf8_column) FROM t1; must create a "VARCHAR(255) CHARACTER SET utf8" column.

Returns:: length

Reimplemented from Field.

Field_blob* Field_blob::clone ( MEM_ROOT * mem_root ) const [inline, virtual]

Makes a shallow copy of the Field object.

Note:: This member function must be overridden in all concrete subclasses. Several of the Field subclasses are concrete even though they are not leaf classes, so the compiler will not always catch this.

Parameters:

mem_root MEM_ROOT to use for memory allocation.

Return values:

NULL	If memory allocation failed.

Implements Field.

Field_blob* Field_blob::clone ( ) const [inline, virtual]

Makes a shallow copy of the Field object.

Note:: This member function must be overridden in all concrete subclasses. Several of the Field subclasses are concrete even though they are not leaf classes, so the compiler will not always catch this.

Return values:

NULL	If memory allocation failed.

Implements Field.

uint Field_blob::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_str.

void Field_blob::make_sort_key	(	uchar *	buff,
		uint	length
	)		`[virtual]`

Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison. Integers are always in big-endian regardless of hardware architecture. At most length bytes are written into the buffer.

Parameters:

buff	The buffer, assumed to be at least length bytes.
length	Number of bytes to write.

Implements Field.

virtual uint32 Field_blob::max_data_length ( ) const [inline, virtual]

Get the maximum size of the data in packed format.

Returns:: Maximum data length of the field when packed using the Field::pack() function.

Reimplemented from Field_longstr.

uint32 Field_blob::max_display_length ( ) [virtual]

maximum possible display length for blob.

Returns:: length

Reimplemented from Field_str.

uchar * Field_blob::pack	(	uchar *	to,
		const uchar *	from,
		uint	max_length,
		bool	low_byte_first
	)		`[virtual]`

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Reimplemented from Field.

uint32 Field_blob::pack_length_no_ptr ( ) const [inline]

Return the packed length without the pointer size added.

This is used to determine the size of the actual data in the row buffer.

Returns:: The length of the raw data itself without the pointer.

void Field_blob::put_length	(	uchar *	pos,
		uint32	length
	)

Put a blob length field into a record buffer.

Depending on the maximum length of a blob, its length field is put into 1 to 4 bytes. This is a property of the blob object, described by 'packlength'.

Parameters:

pos	Pointer into the record buffer.
length	The length value to put.

type_conversion_status Field_blob::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

Reimplemented from Field_str.

void Field_blob::store_ptr_and_length	(	const char *	from,
		uint32	length
	)		`[inline, protected]`

Store ptr and length.

const uchar * Field_blob::unpack	(	uchar *	to,
		const uchar *	from,
		uint	param_data,
		bool	low_byte_first
	)		`[virtual]`

Unpack a blob field from row data.

This method is used to unpack a blob field from a master whose size of the field is less than that of the slave. Note: This method is included to satisfy inheritance rules, but is not needed for blob fields. It simply is used as a pass-through to the original unpack() method for blob fields.

Parameters:

to	Destination of the data
from	Source of the data
param_data	`TRUE` if base types should be stored in little- endian format, `FALSE` if native format should be used.