row0upd.h

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

/******************************************************
Update of a row

(c) 1996 Innobase Oy

Created 12/27/1996 Heikki Tuuri
*******************************************************/

#ifndef row0upd_h
#define row0upd_h

#include "univ.i"
#include "data0data.h"
#include "btr0types.h"
#include "btr0pcur.h"
#include "dict0types.h"
#include "trx0types.h"
#include "que0types.h"
#include "row0types.h"
#include "pars0types.h"
	
/*************************************************************************
Creates an update vector object. */
UNIV_INLINE
upd_t*
upd_create(
/*=======*/
				/* out, own: update vector object */
	ulint		n,	/* in: number of fields */
	mem_heap_t*	heap);	/* in: heap from which memory allocated */
/*************************************************************************
Returns the number of fields in the update vector == number of columns
to be updated by an update vector. */
UNIV_INLINE
ulint
upd_get_n_fields(
/*=============*/
			/* out: number of fields */
	upd_t*	update);	/* in: update vector */
/*************************************************************************
Returns the nth field of an update vector. */
UNIV_INLINE
upd_field_t*
upd_get_nth_field(
/*==============*/
			/* out: update vector field */
	upd_t*	update,	/* in: update vector */
	ulint	n);	/* in: field position in update vector */
/*************************************************************************
Sets an index field number to be updated by an update vector field. */
UNIV_INLINE
void
upd_field_set_field_no(
/*===================*/
	upd_field_t*	upd_field,	/* in: update vector field */
	ulint		field_no,	/* in: field number in a clustered
					index */
	dict_index_t*	index,		/* in: index */
	trx_t*		trx);		/* in: transaction */
/*************************************************************************
Writes into the redo log the values of trx id and roll ptr and enough info
to determine their positions within a clustered index record. */

byte*
row_upd_write_sys_vals_to_log(
/*==========================*/
				/* out: new pointer to mlog */
	dict_index_t*	index,	/* in: clustered index */
	trx_t*		trx,	/* in: transaction */
	dulint		roll_ptr,/* in: roll ptr of the undo log record */
	byte*		log_ptr,/* pointer to a buffer of size > 20 opened
				in mlog */
	mtr_t*		mtr);	/* in: mtr */
/*************************************************************************
Updates the trx id and roll ptr field in a clustered index record when
a row is updated or marked deleted. */
UNIV_INLINE
void
row_upd_rec_sys_fields(
/*===================*/
	rec_t*		rec,	/* in: record */
	dict_index_t*	index,	/* in: clustered index */
	const ulint*	offsets,/* in: rec_get_offsets(rec, index) */
	trx_t*		trx,	/* in: transaction */
	dulint		roll_ptr);/* in: roll ptr of the undo log record */
/*************************************************************************
Sets the trx id or roll ptr field of a clustered index entry. */

void
row_upd_index_entry_sys_field(
/*==========================*/
	dtuple_t*	entry,	/* in: index entry, where the memory buffers
				for sys fields are already allocated:
				the function just copies the new values to
				them */
	dict_index_t*	index,	/* in: clustered index */
	ulint		type,	/* in: DATA_TRX_ID or DATA_ROLL_PTR */
	dulint		val);	/* in: value to write */
/*************************************************************************
Creates an update node for a query graph. */

upd_node_t*
upd_node_create(
/*============*/
				/* out, own: update node */
	mem_heap_t*	heap);	/* in: mem heap where created */
/***************************************************************
Writes to the redo log the new values of the fields occurring in the index. */

void
row_upd_index_write_log(
/*====================*/
	upd_t*	update,	/* in: update vector */
	byte*	log_ptr,/* in: pointer to mlog buffer: must contain at least
			MLOG_BUF_MARGIN bytes of free space; the buffer is
			closed within this function */
	mtr_t*	mtr);	/* in: mtr into whose log to write */
/***************************************************************
Returns TRUE if row update changes size of some field in index or if some
field to be updated is stored externally in rec or update. */

ibool
row_upd_changes_field_size_or_external(
/*===================================*/
				/* out: TRUE if the update changes the size of
				some field in index or the field is external
				in rec or update */
	dict_index_t*	index,	/* in: index */
	const ulint*	offsets,/* in: rec_get_offsets(rec, index) */
	upd_t*		update);/* in: update vector */
/***************************************************************
Replaces the new column values stored in the update vector to the record
given. No field size changes are allowed. This function is used only for
a clustered index */

void
row_upd_rec_in_place(
/*=================*/
	rec_t*		rec,	/* in/out: record where replaced */
	const ulint*	offsets,/* in: array returned by rec_get_offsets() */
	upd_t*		update);/* in: update vector */
/*******************************************************************
Builds an update vector from those fields which in a secondary index entry
differ from a record that has the equal ordering fields. NOTE: we compare
the fields as binary strings! */

upd_t*
row_upd_build_sec_rec_difference_binary(
/*====================================*/
				/* out, own: update vector of differing
				fields */
	dict_index_t*	index,	/* in: index */
	dtuple_t*	entry,	/* in: entry to insert */
	rec_t*		rec,	/* in: secondary index record */
	trx_t*		trx,	/* in: transaction */
	mem_heap_t*	heap);	/* in: memory heap from which allocated */
/*******************************************************************
Builds an update vector from those fields, excluding the roll ptr and
trx id fields, which in an index entry differ from a record that has
the equal ordering fields. NOTE: we compare the fields as binary strings! */

upd_t*
row_upd_build_difference_binary(
/*============================*/
				/* out, own: update vector of differing
				fields, excluding roll ptr and trx id */
	dict_index_t*	index,	/* in: clustered index */
	dtuple_t*	entry,	/* in: entry to insert */
	ulint*		ext_vec,/* in: array containing field numbers of
				externally stored fields in entry, or NULL */
	ulint		n_ext_vec,/* in: number of fields in ext_vec */
	rec_t*		rec,	/* in: clustered index record */
	trx_t*		trx,	/* in: transaction */
	mem_heap_t*	heap);	/* in: memory heap from which allocated */
/***************************************************************
Replaces the new column values stored in the update vector to the index entry
given. */

void
row_upd_index_replace_new_col_vals_index_pos(
/*=========================================*/
	dtuple_t*	entry,	/* in/out: index entry where replaced */
	dict_index_t*	index,	/* in: index; NOTE that this may also be a
				non-clustered index */
	upd_t*		update,	/* in: an update vector built for the index so
				that the field number in an upd_field is the
				index position */
	mem_heap_t*	heap);	/* in: memory heap to which we allocate and
				copy the new values, set this as NULL if you
				do not want allocation */
/***************************************************************
Replaces the new column values stored in the update vector to the index entry
given. */

void
row_upd_index_replace_new_col_vals(
/*===============================*/
	dtuple_t*	entry,	/* in/out: index entry where replaced */
	dict_index_t*	index,	/* in: index; NOTE that this may also be a
				non-clustered index */
	upd_t*		update,	/* in: an update vector built for the
				CLUSTERED index so that the field number in
				an upd_field is the clustered index position */
	mem_heap_t*	heap);	/* in: memory heap to which we allocate and
				copy the new values, set this as NULL if you
				do not want allocation */
/***************************************************************
Checks if an update vector changes an ordering field of an index record.
This function is fast if the update vector is short or the number of ordering
fields in the index is small. Otherwise, this can be quadratic.
NOTE: we compare the fields as binary strings! */
 
ibool
row_upd_changes_ord_field_binary(
/*=============================*/