data0data.cc File Reference

SQL data field and tuple. More...

#include <sys/types.h>
#include <new>
#include "data0data.h"
#include "ha_prototypes.h"
#include "btr0cur.h"
#include "dict0dict.h"
#include "lob0lob.h"
#include "page0page.h"
#include "page0zip.h"
#include "rem0cmp.h"
#include "rem0rec.h"
#include "row0mysql.h"
#include "row0upd.h"

Functions
bool	dtuple_coll_eq (const dtuple_t *tuple1, const dtuple_t *tuple2)
	Compare two data tuples. More...
void	dtuple_set_n_fields (dtuple_t *tuple, ulint n_fields)
	Sets number of fields used in a tuple. More...
static bool	dfield_check_typed_no_assert (const dfield_t *field)
	Checks that a data field is typed. More...
static bool	dtuple_check_typed_no_assert (const dtuple_t *tuple)
	Checks that a data tuple is typed. More...
bool	dfield_check_typed (const dfield_t *field)
	Checks that a data field is typed. More...
bool	dtuple_check_typed (const dtuple_t *tuple)
	Checks that a data tuple is typed. More...
bool	dtuple_validate (const dtuple_t *tuple)
	Validates the consistency of a tuple which must be complete, i.e, all fields must have been set. More...
void	dfield_print_also_hex (const dfield_t *dfield)
	Pretty prints a dfield value according to its data type. More...
static void	dfield_print_raw (FILE *f, const dfield_t *dfield)
	Print a dfield value using ut_print_buf. More...
void	dtuple_print (FILE *f, const dtuple_t *tuple)
	The following function prints the contents of a tuple. More...
void	dfield_print (std::ostream &o, const dfield_t *field, ulint n)
	Print the contents of a tuple. More...
void	dtuple_print (std::ostream &o, const dtuple_t *tuple)
	Print the contents of a tuple. More...
big_rec_t *	dtuple_convert_big_rec (dict_index_t *index, upd_t *upd, dtuple_t *entry)
	Moves parts of long fields in entry to the big record vector so that the size of tuple drops below the maximum record size allowed in the database. More...
void	dtuple_convert_back_big_rec (dtuple_t *entry, big_rec_t *vector)
	Puts back to entry the data stored in vector. More...
bool	is_multi_value_clust_and_sec_equal (const byte *clust_field, uint64_t clust_len, const byte *sec_field, uint64_t sec_len, const dict_col_t *col)
	Compare a multi-value clustered index field with a secondary index field, to see if they are equal. More...

Variables
byte	data_error
	Dummy variable to catch access to uninitialized fields. More...

Detailed Description

SQL data field and tuple.

Created 5/30/1994 Heikki Tuuri

Function Documentation

dfield_check_typed()

bool dfield_check_typed

(

const dfield_t *

field

)

Checks that a data field is typed.

Asserts an error if not.

Returns

true if ok in: data field

dfield_check_typed_no_assert()

static bool dfield_check_typed_no_assert ( const dfield_t *  field )

static

Checks that a data field is typed.

Parameters

[in]

field

Data field.

Returns

true if ok

dfield_print()

void dfield_print	(	std::ostream &	o,
		const dfield_t *	field,
		ulint	n
	)

Print the contents of a tuple.

Parameters

[out]	o	output stream
[in]	field	array of data fields
[in]	n	number of data fields

dfield_print_also_hex()

void dfield_print_also_hex

(

const dfield_t *

dfield

)

Pretty prints a dfield value according to its data type.

Also the hex string is printed if a string contains non-printable characters. in: dfield

dfield_print_raw()

static void dfield_print_raw ( FILE *  f, const dfield_t *  dfield  )

static

Print a dfield value using ut_print_buf.

Parameters

[in,out]	f	Output stream.
[in]	dfield	Value to print.

dtuple_check_typed()

bool dtuple_check_typed

(

const dtuple_t *

tuple

)

Checks that a data tuple is typed.

Asserts an error if not.

Returns

true if ok in: tuple

dtuple_check_typed_no_assert()

static bool dtuple_check_typed_no_assert ( const dtuple_t *  tuple )

static

Checks that a data tuple is typed.

Parameters

[in]

tuple

Tuple to check.

Returns

true if ok

dtuple_coll_eq()

bool dtuple_coll_eq	(	const dtuple_t *	tuple1,
		const dtuple_t *	tuple2
	)

Compare two data tuples.

Parameters

[in]	tuple1	first data tuple
[in]	tuple2	second data tuple

Returns

whether tuple1==tuple2

dtuple_convert_back_big_rec()

void dtuple_convert_back_big_rec	(	dtuple_t *	entry,
		big_rec_t *	vector
	)

Puts back to entry the data stored in vector.

Note that to ensure the fields in entry can accommodate the data, vector must have been created from entry with dtuple_convert_big_rec.

Parameters

[in]	entry	Entry whose data was put to vector.
[in]	vector	Big rec vector; it is freed in this function

dtuple_convert_big_rec()

big_rec_t * dtuple_convert_big_rec	(	dict_index_t *	index,
		upd_t *	upd,
		dtuple_t *	entry
	)

Moves parts of long fields in entry to the big record vector so that the size of tuple drops below the maximum record size allowed in the database.

Moves data only from those fields which are not necessary to determine uniquely the insertion place of the tuple in the index.

Parameters

[in,out]	index	Index that owns the record.
[in,out]	upd	Update vector.
[in,out]	entry	Index entry.

Returns

own: created big record vector, NULL if we are not able to shorten the entry enough, i.e., if there are too many fixed-length or short fields in entry or the index is clustered

dtuple_print() [1/2]

void dtuple_print	(	FILE *	f,
		const dtuple_t *	tuple
	)

The following function prints the contents of a tuple.

Parameters

[in,out]	f	Output stream.
[in]	tuple	Tuple to print.

dtuple_print() [2/2]

void dtuple_print	(	std::ostream &	o,
		const dtuple_t *	tuple
	)

Print the contents of a tuple.

Parameters

[out]	o	output stream
[in]	tuple	data tuple

dtuple_set_n_fields()

void dtuple_set_n_fields	(	dtuple_t *	tuple,
		ulint	n_fields
	)

Sets number of fields used in a tuple.

Normally this is set in dtuple_create, but if you want later to set it smaller, you can use this.

Parameters

[in]	tuple	Tuple.
[in]	n_fields	Number of fields.

dtuple_validate()

bool dtuple_validate

(

const dtuple_t *

tuple

)

Validates the consistency of a tuple which must be complete, i.e, all fields must have been set.

Returns

true if ok in: tuple

is_multi_value_clust_and_sec_equal()

bool is_multi_value_clust_and_sec_equal	(	const byte *	clust_field,
		uint64_t	clust_len,
		const byte *	sec_field,
		uint64_t	sec_len,
		const dict_col_t *	col
	)

Compare a multi-value clustered index field with a secondary index field, to see if they are equal.

If the clustered index field is the array, then equal means it contains the secondary index field

Parameters

[in]	clust_field	clustered index field
[in]	clust_len	clustered index field length
[in]	sec_field	secondary index field
[in]	sec_len	secondary index field length
[in]	col	the column tied to this field

Returns

true if they are equal, otherwise false

Variable Documentation

data_error

byte data_error

Dummy variable to catch access to uninitialized fields.

In the debug version, dtuple_create() will make all fields of dtuple_t point to data_error.