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311 lines
11 KiB
C
311 lines
11 KiB
C
/*****************************************************************************
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Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/row0row.h
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General row routines
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Created 4/20/1996 Heikki Tuuri
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*******************************************************/
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#ifndef row0row_h
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#define row0row_h
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#include "univ.i"
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#include "data0data.h"
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#include "dict0types.h"
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#include "trx0types.h"
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#include "que0types.h"
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#include "mtr0mtr.h"
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#include "rem0types.h"
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#include "read0types.h"
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#include "row0types.h"
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#include "btr0types.h"
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/*********************************************************************//**
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Gets the offset of the trx id field, in bytes relative to the origin of
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a clustered index record.
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@return offset of DATA_TRX_ID */
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UNIV_INTERN
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ulint
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row_get_trx_id_offset(
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/*==================*/
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const rec_t* rec, /*!< in: record */
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dict_index_t* index, /*!< in: clustered index */
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const ulint* offsets);/*!< in: rec_get_offsets(rec, index) */
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/*********************************************************************//**
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Reads the trx id field from a clustered index record.
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@return value of the field */
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UNIV_INLINE
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trx_id_t
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row_get_rec_trx_id(
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/*===============*/
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const rec_t* rec, /*!< in: record */
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dict_index_t* index, /*!< in: clustered index */
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const ulint* offsets);/*!< in: rec_get_offsets(rec, index) */
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/*********************************************************************//**
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Reads the roll pointer field from a clustered index record.
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@return value of the field */
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UNIV_INLINE
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roll_ptr_t
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row_get_rec_roll_ptr(
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/*=================*/
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const rec_t* rec, /*!< in: record */
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dict_index_t* index, /*!< in: clustered index */
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const ulint* offsets);/*!< in: rec_get_offsets(rec, index) */
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/*****************************************************************//**
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When an insert or purge to a table is performed, this function builds
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the entry to be inserted into or purged from an index on the table.
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@return index entry which should be inserted or purged, or NULL if the
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externally stored columns in the clustered index record are
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unavailable and ext != NULL */
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UNIV_INTERN
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dtuple_t*
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row_build_index_entry(
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/*==================*/
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const dtuple_t* row, /*!< in: row which should be
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inserted or purged */
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row_ext_t* ext, /*!< in: externally stored column prefixes,
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or NULL */
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dict_index_t* index, /*!< in: index on the table */
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mem_heap_t* heap); /*!< in: memory heap from which the memory for
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the index entry is allocated */
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/*******************************************************************//**
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An inverse function to row_build_index_entry. Builds a row from a
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record in a clustered index.
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@return own: row built; see the NOTE below! */
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UNIV_INTERN
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dtuple_t*
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row_build(
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/*======*/
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ulint type, /*!< in: ROW_COPY_POINTERS or
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ROW_COPY_DATA; the latter
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copies also the data fields to
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heap while the first only
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places pointers to data fields
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on the index page, and thus is
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more efficient */
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const dict_index_t* index, /*!< in: clustered index */
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const rec_t* rec, /*!< in: record in the clustered
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index; NOTE: in the case
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ROW_COPY_POINTERS the data
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fields in the row will point
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directly into this record,
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therefore, the buffer page of
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this record must be at least
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s-latched and the latch held
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as long as the row dtuple is used! */
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const ulint* offsets,/*!< in: rec_get_offsets(rec,index)
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or NULL, in which case this function
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will invoke rec_get_offsets() */
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const dict_table_t* col_table,
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/*!< in: table, to check which
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externally stored columns
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occur in the ordering columns
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of an index, or NULL if
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index->table should be
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consulted instead; the user
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columns in this table should be
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the same columns as in index->table */
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row_ext_t** ext, /*!< out, own: cache of
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externally stored column
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prefixes, or NULL */
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mem_heap_t* heap); /*!< in: memory heap from which
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the memory needed is allocated */
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/*******************************************************************//**
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Converts an index record to a typed data tuple.
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@return index entry built; does not set info_bits, and the data fields
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in the entry will point directly to rec */
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UNIV_INTERN
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dtuple_t*
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row_rec_to_index_entry_low(
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/*=======================*/
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const rec_t* rec, /*!< in: record in the index */
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const dict_index_t* index, /*!< in: index */
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const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
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ulint* n_ext, /*!< out: number of externally
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stored columns */
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mem_heap_t* heap); /*!< in: memory heap from which
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the memory needed is allocated */
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/*******************************************************************//**
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Converts an index record to a typed data tuple. NOTE that externally
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stored (often big) fields are NOT copied to heap.
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@return own: index entry built; see the NOTE below! */
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UNIV_INTERN
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dtuple_t*
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row_rec_to_index_entry(
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/*===================*/
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ulint type, /*!< in: ROW_COPY_DATA, or
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ROW_COPY_POINTERS: the former
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copies also the data fields to
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heap as the latter only places
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pointers to data fields on the
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index page */
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const rec_t* rec, /*!< in: record in the index;
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NOTE: in the case
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ROW_COPY_POINTERS the data
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fields in the row will point
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directly into this record,
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therefore, the buffer page of
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this record must be at least
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s-latched and the latch held
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as long as the dtuple is used! */
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const dict_index_t* index, /*!< in: index */
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ulint* offsets,/*!< in/out: rec_get_offsets(rec) */
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ulint* n_ext, /*!< out: number of externally
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stored columns */
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mem_heap_t* heap); /*!< in: memory heap from which
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the memory needed is allocated */
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/*******************************************************************//**
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Builds from a secondary index record a row reference with which we can
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search the clustered index record.
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@return own: row reference built; see the NOTE below! */
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UNIV_INTERN
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dtuple_t*
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row_build_row_ref(
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/*==============*/
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ulint type, /*!< in: ROW_COPY_DATA, or ROW_COPY_POINTERS:
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the former copies also the data fields to
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heap, whereas the latter only places pointers
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to data fields on the index page */
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dict_index_t* index, /*!< in: secondary index */
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const rec_t* rec, /*!< in: record in the index;
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NOTE: in the case ROW_COPY_POINTERS
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the data fields in the row will point
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directly into this record, therefore,
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the buffer page of this record must be
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at least s-latched and the latch held
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as long as the row reference is used! */
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mem_heap_t* heap); /*!< in: memory heap from which the memory
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needed is allocated */
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/*******************************************************************//**
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Builds from a secondary index record a row reference with which we can
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search the clustered index record. */
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UNIV_INTERN
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void
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row_build_row_ref_in_tuple(
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/*=======================*/
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dtuple_t* ref, /*!< in/out: row reference built;
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see the NOTE below! */
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const rec_t* rec, /*!< in: record in the index;
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NOTE: the data fields in ref
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will point directly into this
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record, therefore, the buffer
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page of this record must be at
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least s-latched and the latch
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held as long as the row
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reference is used! */
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const dict_index_t* index, /*!< in: secondary index */
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ulint* offsets,/*!< in: rec_get_offsets(rec, index)
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or NULL */
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trx_t* trx); /*!< in: transaction */
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/*******************************************************************//**
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Builds from a secondary index record a row reference with which we can
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search the clustered index record. */
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UNIV_INLINE
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void
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row_build_row_ref_fast(
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/*===================*/
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dtuple_t* ref, /*!< in/out: typed data tuple where the
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reference is built */
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const ulint* map, /*!< in: array of field numbers in rec
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telling how ref should be built from
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the fields of rec */
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const rec_t* rec, /*!< in: record in the index; must be
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preserved while ref is used, as we do
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not copy field values to heap */
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const ulint* offsets);/*!< in: array returned by rec_get_offsets() */
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/***************************************************************//**
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Searches the clustered index record for a row, if we have the row
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reference.
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@return TRUE if found */
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UNIV_INTERN
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ibool
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row_search_on_row_ref(
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/*==================*/
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btr_pcur_t* pcur, /*!< out: persistent cursor, which must
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be closed by the caller */
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ulint mode, /*!< in: BTR_MODIFY_LEAF, ... */
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const dict_table_t* table, /*!< in: table */
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const dtuple_t* ref, /*!< in: row reference */
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mtr_t* mtr); /*!< in/out: mtr */
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/*********************************************************************//**
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Fetches the clustered index record for a secondary index record. The latches
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on the secondary index record are preserved.
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@return record or NULL, if no record found */
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UNIV_INTERN
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rec_t*
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row_get_clust_rec(
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/*==============*/
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ulint mode, /*!< in: BTR_MODIFY_LEAF, ... */
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const rec_t* rec, /*!< in: record in a secondary index */
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dict_index_t* index, /*!< in: secondary index */
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dict_index_t** clust_index,/*!< out: clustered index */
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mtr_t* mtr); /*!< in: mtr */
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/***************************************************************//**
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Searches an index record.
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@return TRUE if found */
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UNIV_INTERN
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ibool
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row_search_index_entry(
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/*===================*/
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dict_index_t* index, /*!< in: index */
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const dtuple_t* entry, /*!< in: index entry */
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ulint mode, /*!< in: BTR_MODIFY_LEAF, ... */
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btr_pcur_t* pcur, /*!< in/out: persistent cursor, which must
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be closed by the caller */
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mtr_t* mtr); /*!< in: mtr */
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#define ROW_COPY_DATA 1
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#define ROW_COPY_POINTERS 2
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/* The allowed latching order of index records is the following:
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(1) a secondary index record ->
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(2) the clustered index record ->
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(3) rollback segment data for the clustered index record.
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No new latches may be obtained while the kernel mutex is reserved.
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However, the kernel mutex can be reserved while latches are owned. */
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/*******************************************************************//**
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Formats the raw data in "data" (in InnoDB on-disk format) using
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"dict_field" and writes the result to "buf".
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Not more than "buf_size" bytes are written to "buf".
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The result is always NUL-terminated (provided buf_size is positive) and the
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number of bytes that were written to "buf" is returned (including the
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terminating NUL).
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@return number of bytes that were written */
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UNIV_INTERN
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ulint
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row_raw_format(
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/*===========*/
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const char* data, /*!< in: raw data */
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ulint data_len, /*!< in: raw data length
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in bytes */
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const dict_field_t* dict_field, /*!< in: index field */
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char* buf, /*!< out: output buffer */
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ulint buf_size); /*!< in: output buffer size
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in bytes */
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#ifndef UNIV_NONINL
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#include "row0row.ic"
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#endif
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#endif
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