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/******************************************************
General row routines
(c) 1996 Innobase Oy
Created 4/20/1996 Heikki Tuuri
*******************************************************/
#ifndef row0row_h
#define row0row_h
#include "univ.i"
#include "data0data.h"
#include "dict0types.h"
#include "trx0types.h"
#include "que0types.h"
#include "mtr0mtr.h"
#include "rem0types.h"
#include "read0types.h"
#include "btr0types.h"
/*************************************************************************
Reads the trx id field from a clustered index record. */
UNIV_INLINE
dulint
row_get_rec_trx_id(
/*===============*/
/* out: value of the field */
rec_t* rec, /* in: record */
dict_index_t* index, /* in: clustered index */
const ulint* offsets);/* in: rec_get_offsets(rec, index) */
/*************************************************************************
Reads the roll pointer field from a clustered index record. */
UNIV_INLINE
dulint
row_get_rec_roll_ptr(
/*=================*/
/* out: value of the field */
rec_t* rec, /* in: record */
dict_index_t* index, /* in: clustered index */
const ulint* offsets);/* in: rec_get_offsets(rec, index) */
/*************************************************************************
Writes the trx id field to a clustered index record. */
UNIV_INLINE
void
row_set_rec_trx_id(
/*===============*/
rec_t* rec, /* in: record */
dict_index_t* index, /* in: clustered index */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
dulint trx_id);/* in: value of the field */
/*************************************************************************
Sets the roll pointer field in a clustered index record. */
UNIV_INLINE
void
row_set_rec_roll_ptr(
/*=================*/
rec_t* rec, /* in: record */
dict_index_t* index, /* in: clustered index */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
dulint roll_ptr);/* in: value of the field */
/*********************************************************************
When an insert to a table is performed, this function builds the entry which
has to be inserted to an index on the table. */
dtuple_t*
row_build_index_entry(
/*==================*/
/* out: index entry which should be inserted */
dtuple_t* row, /* in: row which should be inserted to the
table */
dict_index_t* index, /* in: index on the table */
mem_heap_t* heap); /* in: memory heap from which the memory for
the index entry is allocated */
/***********************************************************************
An inverse function to dict_row_build_index_entry. Builds a row from a
record in a clustered index. */
dtuple_t*
row_build(
/*======*/
/* out, own: row built; see the NOTE below! */
ulint type, /* in: ROW_COPY_POINTERS, ROW_COPY_DATA, or
ROW_COPY_ALSO_EXTERNALS,
the two last copy also the data fields to
heap as the first only places pointers to
data fields on the index page, and thus is
more efficient */
dict_index_t* index, /* in: clustered index */
rec_t* rec, /* in: record in the clustered index;
NOTE: in the case ROW_COPY_POINTERS
the data fields in the row will point
directly into this record, therefore,
the buffer page of this record must be
at least s-latched and the latch held
as long as the row dtuple is used! */
const ulint* offsets,/* in: rec_get_offsets(rec, index)
or NULL, in which case this function
will invoke rec_get_offsets() */
mem_heap_t* heap); /* in: memory heap from which the memory
needed is allocated */
/***********************************************************************
Converts an index record to a typed data tuple. */
dtuple_t*
row_rec_to_index_entry(
/*===================*/
/* out, own: index entry built; see the
NOTE below! */
ulint type, /* in: ROW_COPY_DATA, or ROW_COPY_POINTERS:
the former copies also the data fields to
heap as the latter only places pointers to
data fields on the index page */
dict_index_t* index, /* in: index */
rec_t* rec, /* in: record in the index;
NOTE: in the case ROW_COPY_POINTERS
the data fields in the row will point
directly into this record, therefore,
the buffer page of this record must be
at least s-latched and the latch held
as long as the dtuple is used! */
mem_heap_t* heap); /* in: memory heap from which the memory
needed is allocated */
/***********************************************************************
Builds from a secondary index record a row reference with which we can
search the clustered index record. */
dtuple_t*
row_build_row_ref(
/*==============*/
/* out, own: row reference built; see the
NOTE below! */
ulint type, /* in: ROW_COPY_DATA, or ROW_COPY_POINTERS:
the former copies also the data fields to
heap, whereas the latter only places pointers
to data fields on the index page */
dict_index_t* index, /* in: index */
rec_t* rec, /* in: record in the index;
NOTE: in the case ROW_COPY_POINTERS
the data fields in the row will point
directly into this record, therefore,
the buffer page of this record must be
at least s-latched and the latch held
as long as the row reference is used! */
mem_heap_t* heap); /* in: memory heap from which the memory
needed is allocated */
/***********************************************************************
Builds from a secondary index record a row reference with which we can
search the clustered index record. */
void
row_build_row_ref_in_tuple(
/*=======================*/
dtuple_t* ref, /* in/out: row reference built; see the
NOTE below! */
dict_index_t* index, /* in: index */
rec_t* rec, /* in: record in the index;
NOTE: the data fields in ref will point
directly into this record, therefore,
the buffer page of this record must be
at least s-latched and the latch held
as long as the row reference is used! */
trx_t* trx); /* in: transaction */
/***********************************************************************
From a row build a row reference with which we can search the clustered
index record. */
void
row_build_row_ref_from_row(
/*=======================*/
dtuple_t* ref, /* in/out: row reference built; see the
NOTE below! ref must have the right number
of fields! */
dict_table_t* table, /* in: table */
dtuple_t* row); /* in: row
NOTE: the data fields in ref will point
directly into data of this row */
/***********************************************************************
Builds from a secondary index record a row reference with which we can
search the clustered index record. */
UNIV_INLINE
void
row_build_row_ref_fast(
/*===================*/
dtuple_t* ref, /* in: typed data tuple where the
reference is built */
const ulint* map, /* in: array of field numbers in rec
telling how ref should be built from
the fields of rec */
rec_t* rec, /* in: record in the index; must be
preserved while ref is used, as we do
not copy field values to heap */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/*******************************************************************
Searches the clustered index record for a row, if we have the row
reference. */
ibool
row_search_on_row_ref(
/*==================*/
/* out: TRUE if found */
btr_pcur_t* pcur, /* in/out: persistent cursor, which must
be closed by the caller */
ulint mode, /* in: BTR_MODIFY_LEAF, ... */
dict_table_t* table, /* in: table */
dtuple_t* ref, /* in: row reference */
mtr_t* mtr); /* in: mtr */
/*************************************************************************
Fetches the clustered index record for a secondary index record. The latches
on the secondary index record are preserved. */
rec_t*
row_get_clust_rec(
/*==============*/
/* out: record or NULL, if no record found */
ulint mode, /* in: BTR_MODIFY_LEAF, ... */
rec_t* rec, /* in: record in a secondary index */
dict_index_t* index, /* in: secondary index */
dict_index_t** clust_index,/* out: clustered index */
mtr_t* mtr); /* in: mtr */
/*******************************************************************
Searches an index record. */
ibool
row_search_index_entry(
/*===================*/
/* out: TRUE if found */
dict_index_t* index, /* in: index */
dtuple_t* entry, /* in: index entry */
ulint mode, /* in: BTR_MODIFY_LEAF, ... */
btr_pcur_t* pcur, /* in/out: persistent cursor, which must
be closed by the caller */
mtr_t* mtr); /* in: mtr */
#define ROW_COPY_DATA 1
#define ROW_COPY_POINTERS 2
#define ROW_COPY_ALSO_EXTERNALS 3
/* The allowed latching order of index records is the following:
(1) a secondary index record ->
(2) the clustered index record ->
(3) rollback segment data for the clustered index record.
No new latches may be obtained while the kernel mutex is reserved.
However, the kernel mutex can be reserved while latches are owned. */
#ifndef UNIV_NONINL
#include "row0row.ic"
#endif
#endif
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