rem0wrec.cc File Reference

#include "rem0wrec.h"
#include "rem0lrec.h"

Functions
static void	dump_metadata_dict_table (const dict_table_t *table)
	Dumps metadata of table. More...
void	validate_rec_offset (const dict_index_t *index, const ulint *offsets, ulint n, ut::Location L)
	Validates offset and field number. More...
const byte *	rec_get_nth_field_old (const dict_index_t *index, const rec_t *rec, ulint n, ulint *len)
ulint	rec_get_nth_field_size (const dict_index_t *index, const rec_t *rec, ulint n)
	Gets the physical size of an old-style field. More...
ulint	rec_get_nth_field_offs_old (const dict_index_t *index, const rec_t *rec, ulint n, ulint *len)
	The following function is used to get the offset to the nth data field in an old-style record. More...
void	rec_offs_make_nth_extern (dict_index_t *index, ulint *offsets, ulint n)
	Mark the nth field as externally stored. More...
ulint	rec_offs_nth_sql_null (const dict_index_t *index, const ulint *offsets, ulint n)
	Returns nonzero if the SQL NULL bit is set in nth field of rec. More...
ulint	rec_offs_nth_default (const dict_index_t *index, const ulint *offsets, ulint n)
	Returns nonzero if the default bit is set in nth field of rec. More...
ulint	rec_offs_nth_size (const dict_index_t *index, const ulint *offsets, ulint n)
	Gets the physical size of a field. More...
void	rec_set_nth_field (const dict_index_t *index, rec_t *rec, const ulint *offsets, ulint n, const void *data, ulint len)
	This is used to modify the value of an already existing field in a record. More...
ulint	rec_2_is_field_extern (const dict_index_t *index, const rec_t *rec, ulint n)
	Returns nonzero if the field is stored off-page. More...
ulint	rec_get_data_size_old (const rec_t *rec)
	The following function returns the data size of an old-style physical record, that is the sum of field lengths. More...

Function Documentation

dump_metadata_dict_table()

static void dump_metadata_dict_table ( const dict_table_t *  table )

static

Dumps metadata of table.

Parameters

[in]

table

InnoDB table object

rec_2_is_field_extern()

ulint rec_2_is_field_extern	(	const dict_index_t *	index,
		const rec_t *	rec,
		ulint	n
	)

Returns nonzero if the field is stored off-page.

Parameters

[in]	index	index
[in]	rec	record
[in]	n	field index

Return values

0	if the field is stored in-page
REC_2BYTE_EXTERN_MASK	if the field is stored externally

rec_get_data_size_old()

ulint rec_get_data_size_old

(

const rec_t *

rec

)

The following function returns the data size of an old-style physical record, that is the sum of field lengths.

SQL null fields are counted as length 0 fields. The value returned by the function is the distance from record origin to record end in bytes.

Returns

size

rec_get_nth_field_offs_old()

ulint rec_get_nth_field_offs_old	(	const dict_index_t *	index,
		const rec_t *	rec,
		ulint	n,
		ulint *	len
	)

The following function is used to get the offset to the nth data field in an old-style record.

Parameters

[in]	index	record descriptor
[in]	rec	record
[in]	n	index of the field
[in]	len	length of the field;UNIV_SQL_NULL if SQL null

Returns

offset to the field

rec_get_nth_field_old()

const byte * rec_get_nth_field_old	(	const dict_index_t *	index,
		const rec_t *	rec,
		ulint	n,
		ulint *	len
	)

rec_get_nth_field_size()

ulint rec_get_nth_field_size	(	const dict_index_t *	index,
		const rec_t *	rec,
		ulint	n
	)

Gets the physical size of an old-style field.

Also an SQL null may have a field of size > 0, if the data type is of a fixed size.

Parameters

[in]	index	record descriptor
[in]	rec	record
[in]	n	index of the field

Returns

field size in bytes

rec_offs_make_nth_extern()

void rec_offs_make_nth_extern	(	dict_index_t *	index,
		ulint *	offsets,
		ulint	n
	)

Mark the nth field as externally stored.

Parameters

[in]	index	record descriptor
[in]	offsets	array returned by rec_get_offsets()
[in]	n	nth field

rec_offs_nth_default()

ulint rec_offs_nth_default	(	const dict_index_t *	index,
		const ulint *	offsets,
		ulint	n
	)

Returns nonzero if the default bit is set in nth field of rec.

Parameters

[in]	index	record descriptor
[in]	offsets	array returned by rec_get_offsets()
[in]	n	nth field

Returns

nonzero if default bit is set

rec_offs_nth_size()

ulint rec_offs_nth_size	(	const dict_index_t *	index,
		const ulint *	offsets,
		ulint	n
	)

Gets the physical size of a field.

Parameters

[in]	index	record descriptor
[in]	offsets	array returned by rec_get_offsets()
[in]	n	nth field

Returns

length of field

rec_offs_nth_sql_null()

ulint rec_offs_nth_sql_null	(	const dict_index_t *	index,
		const ulint *	offsets,
		ulint	n
	)

Returns nonzero if the SQL NULL bit is set in nth field of rec.

Parameters

[in]	index	record descriptor
[in]	offsets	array returned by rec_get_offsets()
[in]	n	nth field

Returns

nonzero if SQL NULL

rec_set_nth_field()

void rec_set_nth_field	(	const dict_index_t *	index,
		rec_t *	rec,
		const ulint *	offsets,
		ulint	n,
		const void *	data,
		ulint	len
	)

This is used to modify the value of an already existing field in a record.

The previous value must have exactly the same size as the new value. If len is UNIV_SQL_NULL then the field is treated as an SQL null. For records in ROW_FORMAT=COMPACT (new-style records), len must not be UNIV_SQL_NULL unless the field already is SQL null.

Parameters

[in]	index	record descriptor
[in]	rec	record
[in]	offsets	array returned by rec_get_offsets()
[in]	n	index number of the field
[in]	len	length of the data or UNIV_SQL_NULL. If not SQL null, must have the same length as the previous value. If SQL null, previous value must be SQL null.
[in]	data	pointer to the data if not SQL null

validate_rec_offset()

void validate_rec_offset	(	const dict_index_t *	index,
		const ulint *	offsets,
		ulint	n,
		ut::Location	L
	)

Validates offset and field number.

Parameters

[in]	index	record descriptor
[in]	offsets	array returned by rec_get_offsets()
[in]	n	nth field
[in]	L	Line number of calling satement