Copy_field Class Reference

Inheritance diagram for Copy_field:

List of all members.

Public Member Functions
void	set (Field *to, Field *from, bool save)
void	set (uchar *to, Field *from)
Public Attributes
uchar *	from_ptr
uchar *	to_ptr
uchar *	from_null_ptr
uchar *	to_null_ptr
my_bool *	null_row
uint	from_bit
uint	to_bit
uint	from_length
uint	to_length
Field *	from_field
Field *	to_field
String	tmp
void(*	do_copy )(Copy_field *)
void(*	do_copy2 )(Copy_field *)

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Member Function Documentation

void Copy_field::set	(	uchar *	to,
		Field *	from
	)

copy of field to maybe null string. If field is null then the all bytes are set to 0. if field is not null then the first byte is set to 1 and the rest of the string is the field value. The 'to' buffer should have a size of field->pack_length()+1

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Member Data Documentation

uint Copy_field::from_length

Number of bytes in the fields pointed to by 'from_ptr' and 'to_ptr'. Usually this is the number of bytes that are copied from 'from_ptr' to 'to_ptr'.

For variable-length fields (VARCHAR), the first byte(s) describe the actual length of the text. For VARCHARs with length < 256 there is 1 length byte >= 256 there is 2 length bytes Thus, if from_field is VARCHAR(10), from_length (and in most cases to_length) is 11. For VARCHAR(1024), the length is 1026.

See also:

Field_varstring::length_bytes

Note that for VARCHARs, do_copy() will be do_varstring*() which only copies the length-bytes (1 or 2) + the actual length of the text instead of from/to_length bytes.

See also:

get_copy_func()

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

• field.h
• field_conv.cc