rem0rec.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

/************************************************************************
Record manager

(c) 1994-1996 Innobase Oy

Created 5/30/1994 Heikki Tuuri
*************************************************************************/

#ifndef rem0rec_h
#define rem0rec_h

#include "univ.i"
#include "data0data.h"
#include "rem0types.h"
#include "mtr0types.h"

/* Maximum values for various fields (for non-blob tuples) */
#define REC_MAX_N_FIELDS	(1024 - 1)
#define REC_MAX_HEAP_NO		(2 * 8192 - 1)
#define REC_MAX_N_OWNED		(16 - 1)

/* Flag denoting the predefined minimum record: this bit is ORed in the 4
info bits of a record */
#define REC_INFO_MIN_REC_FLAG	0x10UL

/* Number of extra bytes in an old-style record,
in addition to the data and the offsets */
#define REC_N_OLD_EXTRA_BYTES	6
/* Number of extra bytes in a new-style record,
in addition to the data and the offsets */
#define REC_N_NEW_EXTRA_BYTES	5

/* Record status values */
#define REC_STATUS_ORDINARY	0
#define REC_STATUS_NODE_PTR	1
#define REC_STATUS_INFIMUM	2
#define REC_STATUS_SUPREMUM	3

/* Number of elements that should be initially allocated for the
offsets[] array, first passed to rec_get_offsets() */
#define REC_OFFS_NORMAL_SIZE	100
#define REC_OFFS_SMALL_SIZE	10

/**********************************************************
The following function is used to get the offset of the
next chained record on the same page. */
UNIV_INLINE
ulint 
rec_get_next_offs(
/*==============*/
			/* out: the page offset of the next 
			chained record */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the next record offset field
of the record. */
UNIV_INLINE
void
rec_set_next_offs(
/*==============*/
	rec_t*	rec,	/* in: physical record */
	ulint	comp,	/* in: nonzero=compact page format */
	ulint	next);	/* in: offset of the next record */
/**********************************************************
The following function is used to get the number of fields
in an old-style record. */
UNIV_INLINE
ulint
rec_get_n_fields_old(
/*=================*/
			/* out: number of data fields */
	rec_t*	rec);	/* in: physical record */
/**********************************************************
The following function is used to get the number of fields
in a record. */
UNIV_INLINE
ulint
rec_get_n_fields(
/*=============*/
				/* out: number of data fields */
	rec_t*		rec,	/* in: physical record */
	dict_index_t*	index);	/* in: record descriptor */
/**********************************************************
The following function is used to get the number of records
owned by the previous directory record. */
UNIV_INLINE
ulint
rec_get_n_owned(
/*============*/
			/* out: number of owned records */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the number of owned
records. */
UNIV_INLINE
void
rec_set_n_owned(
/*============*/
	rec_t*	rec,		/* in: physical record */
	ulint	comp,		/* in: nonzero=compact page format */
	ulint	n_owned);	/* in: the number of owned */
/**********************************************************
The following function is used to retrieve the info bits of
a record. */
UNIV_INLINE
ulint
rec_get_info_bits(
/*==============*/
			/* out: info bits */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the info bits of a record. */
UNIV_INLINE
void
rec_set_info_bits(
/*==============*/
	rec_t*	rec,	/* in: physical record */
	ulint	comp,	/* in: nonzero=compact page format */
	ulint	bits);	/* in: info bits */
/**********************************************************
The following function retrieves the status bits of a new-style record. */
UNIV_INLINE
ulint
rec_get_status(
/*===========*/
			/* out: status bits */
	rec_t*	rec);	/* in: physical record */

/**********************************************************
The following function is used to set the status bits of a new-style record. */
UNIV_INLINE
void
rec_set_status(
/*===========*/
	rec_t*	rec,	/* in: physical record */
	ulint	bits);	/* in: info bits */

/**********************************************************
The following function is used to retrieve the info and status
bits of a record.  (Only compact records have status bits.) */
UNIV_INLINE
ulint
rec_get_info_and_status_bits(
/*=========================*/
			/* out: info bits */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the info and status
bits of a record.  (Only compact records have status bits.) */
UNIV_INLINE
void
rec_set_info_and_status_bits(
/*=========================*/
	rec_t*	rec,	/* in: physical record */
	ulint	comp,	/* in: nonzero=compact page format */
	ulint	bits);	/* in: info bits */

/**********************************************************
The following function tells if record is delete marked. */
UNIV_INLINE
ulint
rec_get_deleted_flag(
/*=================*/
			/* out: nonzero if delete marked */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the deleted bit. */
UNIV_INLINE
void
rec_set_deleted_flag(
/*=================*/
	rec_t*	rec,	/* in: physical record */
	ulint	comp,	/* in: nonzero=compact page format */
	ulint	flag);	/* in: nonzero if delete marked */
/**********************************************************
The following function tells if a new-style record is a node pointer. */
UNIV_INLINE
ibool
rec_get_node_ptr_flag(
/*=================*/
			/* out: TRUE if node pointer */
	rec_t*	rec);	/* in: physical record */
/**********************************************************
The following function is used to get the order number
of the record in the heap of the index page. */
UNIV_INLINE
ulint
rec_get_heap_no(
/*=============*/
			/* out: heap order number */
	rec_t*	rec,	/* in: physical record */
	ulint	comp);	/* in: nonzero=compact page format */
/**********************************************************
The following function is used to set the heap number
field in the record. */
UNIV_INLINE
void
rec_set_heap_no(
/*=============*/
	rec_t*	rec,	/* in: physical record */
	ulint	comp,	/* in: nonzero=compact page format */
	ulint	heap_no);/* in: the heap number */
/**********************************************************
The following function is used to test whether the data offsets
in the record are stored in one-byte or two-byte format. */
UNIV_INLINE
ibool
rec_get_1byte_offs_flag(
/*====================*/
			/* out: TRUE if 1-byte form */
	rec_t*	rec);	/* in: physical record */
/**********************************************************
The following function determines the offsets to each field
in the record.  It can reuse a previously allocated array. */

ulint*
rec_get_offsets_func(
/*=================*/
				/* out: the new offsets */
	rec_t*		rec,	/* in: physical record */
	dict_index_t*	index,	/* in: record descriptor */
	ulint*		offsets,/* in: array consisting of offsets[0]
				allocated elements, or an array from
				rec_get_offsets(), or NULL */
	ulint		n_fields,/* in: maximum number of initialized fields
				(ULINT_UNDEFINED if all fields) */
	mem_heap_t**	heap,	/* in/out: memory heap */
	const char*	file,	/* in: file name where called */
	ulint		line);	/* in: line number where called */

#define rec_get_offsets(rec,index,offsets,n,heap)	\
	rec_get_offsets_func(rec,index,offsets,n,heap,__FILE__,__LINE__)

/****************************************************************
Validates offsets returned by rec_get_offsets(). */
UNIV_INLINE
ibool
rec_offs_validate(
/*==============*/
				/* out: TRUE if valid */
	rec_t*		rec,	/* in: record or NULL */
	dict_index_t*	index,	/* in: record descriptor or NULL */
	const ulint*	offsets);/* in: array returned by rec_get_offsets() */
/****************************************************************
Updates debug data in offsets, in order to avoid bogus
rec_offs_validate() failures. */
UNIV_INLINE
void
rec_offs_make_valid(
/*================*/
	rec_t*		rec,	/* in: record */
	dict_index_t*	index,/* in: record descriptor */
	ulint*		offsets);/* in: array returned by rec_get_offsets() */

/****************************************************************
The following function is used to get a pointer to the nth
data field in an old-style record. */

byte*
rec_get_nth_field_old(
/*==================*/
 			/* out: pointer to the field */
 	rec_t*	rec, 	/* in: record */
 	ulint	n,	/* in: index of the field */
	ulint*	len);	/* out: length of the field; UNIV_SQL_NULL 
			if SQL null */
/****************************************************************
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. */
UNIV_INLINE
ulint
rec_get_nth_field_size(
/*===================*/
			/* out: field size in bytes */
 	rec_t*	rec, 	/* in: record */
 	ulint	n);	/* in: index of the field */
/****************************************************************
The following function is used to get a pointer to the nth
data field in a record. */
UNIV_INLINE
byte*
rec_get_nth_field(
/*==============*/
	 			/* out: pointer to the field */
	rec_t*		rec, 	/* in: record */
	const ulint*	offsets,/* in: array returned by rec_get_offsets() */
	ulint		n,	/* in: index of the field */
	ulint*		len);	/* out: length of the field; UNIV_SQL_NULL
				if SQL null */