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e85e1206b1
Additional fixes in 5.5: ibuf_set_del_mark(): Add diagnostics when setting a buffered delete-mark fails. ibuf_delete(): Correct a misleading comment about non-found records. rec_print(): Add a const qualifier to the index parameter. Bug #56680 wrong InnoDB results from a case-insensitive covering index row_search_for_mysql(): When a secondary index record might not be visible in the current transaction's read view and we consult the clustered index and optionally some undo log records, return the relevant columns of the clustered index record to MySQL instead of the secondary index record. ibuf_insert_to_index_page_low(): New function, refactored from ibuf_insert_to_index_page(). ibuf_insert_to_index_page(): When we are inserting a record in place of a delete-marked record and some fields of the record differ, update that record just like row_ins_sec_index_entry_by_modify() would do. btr_cur_update_alloc_zip(): Make the function public. mysql_row_templ_t: Add clust_rec_field_no. row_sel_store_mysql_rec(), row_sel_push_cache_row_for_mysql(): Add the flag rec_clust, for returning data at clust_rec_field_no instead of rec_field_no. Resurrect the debug assertion that the record not be marked for deletion. (Bug #55626) [UNIV_DEBUG || UNIV_IBUF_DEBUG] ibuf_debug, buf_page_get_gen(), buf_flush_page_try(): Implement innodb_change_buffering_debug=1 for evicting pages from the buffer pool, so that change buffering will be attempted more frequently.
804 lines
31 KiB
C
804 lines
31 KiB
C
/*****************************************************************************
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Copyright (c) 2000, 2010, 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/row0mysql.h
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Interface between Innobase row operations and MySQL.
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Contains also create table and other data dictionary operations.
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Created 9/17/2000 Heikki Tuuri
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*******************************************************/
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#ifndef row0mysql_h
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#define row0mysql_h
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#include "univ.i"
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#include "data0data.h"
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#include "que0types.h"
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#include "dict0types.h"
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#include "trx0types.h"
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#include "row0types.h"
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#include "btr0pcur.h"
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#include "trx0types.h"
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extern ibool row_rollback_on_timeout;
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typedef struct row_prebuilt_struct row_prebuilt_t;
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/*******************************************************************//**
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Frees the blob heap in prebuilt when no longer needed. */
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UNIV_INTERN
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void
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row_mysql_prebuilt_free_blob_heap(
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/*==============================*/
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct of a
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ha_innobase:: table handle */
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/*******************************************************************//**
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Stores a >= 5.0.3 format true VARCHAR length to dest, in the MySQL row
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format.
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@return pointer to the data, we skip the 1 or 2 bytes at the start
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that are used to store the len */
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UNIV_INTERN
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byte*
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row_mysql_store_true_var_len(
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/*=========================*/
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byte* dest, /*!< in: where to store */
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ulint len, /*!< in: length, must fit in two bytes */
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ulint lenlen);/*!< in: storage length of len: either 1 or 2 bytes */
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/*******************************************************************//**
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Reads a >= 5.0.3 format true VARCHAR length, in the MySQL row format, and
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returns a pointer to the data.
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@return pointer to the data, we skip the 1 or 2 bytes at the start
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that are used to store the len */
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UNIV_INTERN
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const byte*
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row_mysql_read_true_varchar(
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/*========================*/
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ulint* len, /*!< out: variable-length field length */
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const byte* field, /*!< in: field in the MySQL format */
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ulint lenlen);/*!< in: storage length of len: either 1
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or 2 bytes */
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/*******************************************************************//**
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Stores a reference to a BLOB in the MySQL format. */
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UNIV_INTERN
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void
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row_mysql_store_blob_ref(
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/*=====================*/
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byte* dest, /*!< in: where to store */
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ulint col_len,/*!< in: dest buffer size: determines into
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how many bytes the BLOB length is stored,
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the space for the length may vary from 1
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to 4 bytes */
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const void* data, /*!< in: BLOB data; if the value to store
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is SQL NULL this should be NULL pointer */
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ulint len); /*!< in: BLOB length; if the value to store
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is SQL NULL this should be 0; remember
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also to set the NULL bit in the MySQL record
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header! */
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/*******************************************************************//**
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Reads a reference to a BLOB in the MySQL format.
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@return pointer to BLOB data */
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UNIV_INTERN
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const byte*
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row_mysql_read_blob_ref(
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/*====================*/
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ulint* len, /*!< out: BLOB length */
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const byte* ref, /*!< in: BLOB reference in the
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MySQL format */
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ulint col_len); /*!< in: BLOB reference length
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(not BLOB length) */
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/**************************************************************//**
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Pad a column with spaces. */
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UNIV_INTERN
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void
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row_mysql_pad_col(
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/*==============*/
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ulint mbminlen, /*!< in: minimum size of a character,
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in bytes */
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byte* pad, /*!< out: padded buffer */
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ulint len); /*!< in: number of bytes to pad */
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/**************************************************************//**
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Stores a non-SQL-NULL field given in the MySQL format in the InnoDB format.
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The counterpart of this function is row_sel_field_store_in_mysql_format() in
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row0sel.c.
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@return up to which byte we used buf in the conversion */
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UNIV_INTERN
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byte*
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row_mysql_store_col_in_innobase_format(
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/*===================================*/
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dfield_t* dfield, /*!< in/out: dfield where dtype
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information must be already set when
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this function is called! */
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byte* buf, /*!< in/out: buffer for a converted
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integer value; this must be at least
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col_len long then! */
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ibool row_format_col, /*!< TRUE if the mysql_data is from
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a MySQL row, FALSE if from a MySQL
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key value;
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in MySQL, a true VARCHAR storage
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format differs in a row and in a
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key value: in a key value the length
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is always stored in 2 bytes! */
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const byte* mysql_data, /*!< in: MySQL column value, not
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SQL NULL; NOTE that dfield may also
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get a pointer to mysql_data,
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therefore do not discard this as long
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as dfield is used! */
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ulint col_len, /*!< in: MySQL column length; NOTE that
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this is the storage length of the
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column in the MySQL format row, not
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necessarily the length of the actual
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payload data; if the column is a true
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VARCHAR then this is irrelevant */
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ulint comp); /*!< in: nonzero=compact format */
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/****************************************************************//**
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Handles user errors and lock waits detected by the database engine.
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@return TRUE if it was a lock wait and we should continue running the
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query thread */
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UNIV_INTERN
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ibool
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row_mysql_handle_errors(
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/*====================*/
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ulint* new_err,/*!< out: possible new error encountered in
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rollback, or the old error which was
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during the function entry */
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trx_t* trx, /*!< in: transaction */
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que_thr_t* thr, /*!< in: query thread */
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trx_savept_t* savept);/*!< in: savepoint */
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/********************************************************************//**
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Create a prebuilt struct for a MySQL table handle.
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@return own: a prebuilt struct */
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UNIV_INTERN
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row_prebuilt_t*
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row_create_prebuilt(
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/*================*/
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dict_table_t* table); /*!< in: Innobase table handle */
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/********************************************************************//**
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Free a prebuilt struct for a MySQL table handle. */
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UNIV_INTERN
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void
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row_prebuilt_free(
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/*==============*/
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row_prebuilt_t* prebuilt, /*!< in, own: prebuilt struct */
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ibool dict_locked); /*!< in: TRUE=data dictionary locked */
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/*********************************************************************//**
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Updates the transaction pointers in query graphs stored in the prebuilt
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struct. */
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UNIV_INTERN
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void
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row_update_prebuilt_trx(
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/*====================*/
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row_prebuilt_t* prebuilt, /*!< in/out: prebuilt struct
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in MySQL handle */
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trx_t* trx); /*!< in: transaction handle */
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/*********************************************************************//**
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Unlocks AUTO_INC type locks that were possibly reserved by a trx. This
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function should be called at the the end of an SQL statement, by the
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connection thread that owns the transaction (trx->mysql_thd). */
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UNIV_INTERN
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void
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row_unlock_table_autoinc_for_mysql(
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/*===============================*/
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trx_t* trx); /*!< in/out: transaction */
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/*********************************************************************//**
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Sets an AUTO_INC type lock on the table mentioned in prebuilt. The
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AUTO_INC lock gives exclusive access to the auto-inc counter of the
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table. The lock is reserved only for the duration of an SQL statement.
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It is not compatible with another AUTO_INC or exclusive lock on the
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table.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_lock_table_autoinc_for_mysql(
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/*=============================*/
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct in the MySQL
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table handle */
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/*********************************************************************//**
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Sets a table lock on the table mentioned in prebuilt.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_lock_table_for_mysql(
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/*=====================*/
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row_prebuilt_t* prebuilt, /*!< in: prebuilt struct in the MySQL
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table handle */
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dict_table_t* table, /*!< in: table to lock, or NULL
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if prebuilt->table should be
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locked as
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prebuilt->select_lock_type */
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ulint mode); /*!< in: lock mode of table
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(ignored if table==NULL) */
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/*********************************************************************//**
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Does an insert for MySQL.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_insert_for_mysql(
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/*=================*/
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byte* mysql_rec, /*!< in: row in the MySQL format */
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct in MySQL
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handle */
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/*********************************************************************//**
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Builds a dummy query graph used in selects. */
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UNIV_INTERN
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void
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row_prebuild_sel_graph(
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/*===================*/
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct in MySQL
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handle */
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/*********************************************************************//**
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Gets pointer to a prebuilt update vector used in updates. If the update
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graph has not yet been built in the prebuilt struct, then this function
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first builds it.
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@return prebuilt update vector */
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UNIV_INTERN
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upd_t*
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row_get_prebuilt_update_vector(
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/*===========================*/
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct in MySQL
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handle */
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/*********************************************************************//**
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Checks if a table is such that we automatically created a clustered
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index on it (on row id).
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@return TRUE if the clustered index was generated automatically */
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UNIV_INTERN
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ibool
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row_table_got_default_clust_index(
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/*==============================*/
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const dict_table_t* table); /*!< in: table */
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/*********************************************************************//**
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Does an update or delete of a row for MySQL.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_update_for_mysql(
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/*=================*/
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byte* mysql_rec, /*!< in: the row to be updated, in
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the MySQL format */
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row_prebuilt_t* prebuilt); /*!< in: prebuilt struct in MySQL
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handle */
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/*********************************************************************//**
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This can only be used when srv_locks_unsafe_for_binlog is TRUE or this
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session is using a READ COMMITTED or READ UNCOMMITTED isolation level.
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Before calling this function row_search_for_mysql() must have
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initialized prebuilt->new_rec_locks to store the information which new
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record locks really were set. This function removes a newly set
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clustered index record lock under prebuilt->pcur or
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prebuilt->clust_pcur. Thus, this implements a 'mini-rollback' that
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releases the latest clustered index record lock we set.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_unlock_for_mysql(
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/*=================*/
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row_prebuilt_t* prebuilt, /*!< in/out: prebuilt struct in MySQL
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handle */
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ibool has_latches_on_recs);/*!< in: TRUE if called
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so that we have the latches on
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the records under pcur and
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clust_pcur, and we do not need
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to reposition the cursors. */
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/*********************************************************************//**
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Creates an query graph node of 'update' type to be used in the MySQL
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interface.
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@return own: update node */
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UNIV_INTERN
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upd_node_t*
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row_create_update_node_for_mysql(
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/*=============================*/
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dict_table_t* table, /*!< in: table to update */
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mem_heap_t* heap); /*!< in: mem heap from which allocated */
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/**********************************************************************//**
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Does a cascaded delete or set null in a foreign key operation.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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ulint
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row_update_cascade_for_mysql(
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/*=========================*/
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que_thr_t* thr, /*!< in: query thread */
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upd_node_t* node, /*!< in: update node used in the cascade
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or set null operation */
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dict_table_t* table); /*!< in: table where we do the operation */
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/*********************************************************************//**
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Locks the data dictionary exclusively for performing a table create or other
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data dictionary modification operation. */
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UNIV_INTERN
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void
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row_mysql_lock_data_dictionary_func(
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/*================================*/
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trx_t* trx, /*!< in/out: transaction */
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const char* file, /*!< in: file name */
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ulint line); /*!< in: line number */
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#define row_mysql_lock_data_dictionary(trx) \
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row_mysql_lock_data_dictionary_func(trx, __FILE__, __LINE__)
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/*********************************************************************//**
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Unlocks the data dictionary exclusive lock. */
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UNIV_INTERN
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void
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row_mysql_unlock_data_dictionary(
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/*=============================*/
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trx_t* trx); /*!< in/out: transaction */
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/*********************************************************************//**
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Locks the data dictionary in shared mode from modifications, for performing
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foreign key check, rollback, or other operation invisible to MySQL. */
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UNIV_INTERN
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void
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row_mysql_freeze_data_dictionary_func(
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/*==================================*/
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trx_t* trx, /*!< in/out: transaction */
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const char* file, /*!< in: file name */
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ulint line); /*!< in: line number */
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#define row_mysql_freeze_data_dictionary(trx) \
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row_mysql_freeze_data_dictionary_func(trx, __FILE__, __LINE__)
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/*********************************************************************//**
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Unlocks the data dictionary shared lock. */
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UNIV_INTERN
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void
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row_mysql_unfreeze_data_dictionary(
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/*===============================*/
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trx_t* trx); /*!< in/out: transaction */
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/*********************************************************************//**
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Creates a table for MySQL. If the name of the table ends in
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one of "innodb_monitor", "innodb_lock_monitor", "innodb_tablespace_monitor",
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"innodb_table_monitor", then this will also start the printing of monitor
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output by the master thread. If the table name ends in "innodb_mem_validate",
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InnoDB will try to invoke mem_validate().
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_create_table_for_mysql(
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/*=======================*/
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dict_table_t* table, /*!< in, own: table definition
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(will be freed) */
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trx_t* trx); /*!< in: transaction handle */
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/*********************************************************************//**
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Does an index creation operation for MySQL. TODO: currently failure
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to create an index results in dropping the whole table! This is no problem
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currently as all indexes must be created at the same time as the table.
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@return error number or DB_SUCCESS */
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UNIV_INTERN
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int
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row_create_index_for_mysql(
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/*=======================*/
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dict_index_t* index, /*!< in, own: index definition
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(will be freed) */
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trx_t* trx, /*!< in: transaction handle */
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const ulint* field_lengths); /*!< in: if not NULL, must contain
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dict_index_get_n_fields(index)
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actual field lengths for the
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index columns, which are
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then checked for not being too
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large. */
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/*********************************************************************//**
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Scans a table create SQL string and adds to the data dictionary
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the foreign key constraints declared in the string. This function
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should be called after the indexes for a table have been created.
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Each foreign key constraint must be accompanied with indexes in
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bot participating tables. The indexes are allowed to contain more
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fields than mentioned in the constraint.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_table_add_foreign_constraints(
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/*==============================*/
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trx_t* trx, /*!< in: transaction */
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const char* sql_string, /*!< in: table create statement where
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foreign keys are declared like:
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FOREIGN KEY (a, b) REFERENCES table2(c, d),
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table2 can be written also with the
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database name before it: test.table2 */
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size_t sql_length, /*!< in: length of sql_string */
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const char* name, /*!< in: table full name in the
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normalized form
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database_name/table_name */
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ibool reject_fks); /*!< in: if TRUE, fail with error
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code DB_CANNOT_ADD_CONSTRAINT if
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any foreign keys are found. */
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/*********************************************************************//**
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The master thread in srv0srv.c calls this regularly to drop tables which
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we must drop in background after queries to them have ended. Such lazy
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dropping of tables is needed in ALTER TABLE on Unix.
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@return how many tables dropped + remaining tables in list */
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UNIV_INTERN
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ulint
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row_drop_tables_for_mysql_in_background(void);
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/*=========================================*/
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/*********************************************************************//**
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Get the background drop list length. NOTE: the caller must own the kernel
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mutex!
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@return how many tables in list */
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UNIV_INTERN
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ulint
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row_get_background_drop_list_len_low(void);
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/*======================================*/
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/*********************************************************************//**
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Truncates a table for MySQL.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_truncate_table_for_mysql(
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/*=========================*/
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dict_table_t* table, /*!< in: table handle */
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trx_t* trx); /*!< in: transaction handle */
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/*********************************************************************//**
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Drops a table for MySQL. If the name of the dropped table ends in
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one of "innodb_monitor", "innodb_lock_monitor", "innodb_tablespace_monitor",
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"innodb_table_monitor", then this will also stop the printing of monitor
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output by the master thread. If the data dictionary was not already locked
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by the transaction, the transaction will be committed. Otherwise, the
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data dictionary will remain locked.
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@return error code or DB_SUCCESS */
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UNIV_INTERN
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int
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row_drop_table_for_mysql(
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/*=====================*/
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const char* name, /*!< in: table name */
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trx_t* trx, /*!< in: transaction handle */
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ibool drop_db);/*!< in: TRUE=dropping whole database */
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/*********************************************************************//**
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Drop all temporary tables during crash recovery. */
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UNIV_INTERN
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void
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row_mysql_drop_temp_tables(void);
|
|
/*============================*/
|
|
|
|
/*********************************************************************//**
|
|
Discards the tablespace of a table which stored in an .ibd file. Discarding
|
|
means that this function deletes the .ibd file and assigns a new table id for
|
|
the table. Also the flag table->ibd_file_missing is set TRUE.
|
|
@return error code or DB_SUCCESS */
|
|
UNIV_INTERN
|
|
int
|
|
row_discard_tablespace_for_mysql(
|
|
/*=============================*/
|
|
const char* name, /*!< in: table name */
|
|
trx_t* trx); /*!< in: transaction handle */
|
|
/*****************************************************************//**
|
|
Imports a tablespace. The space id in the .ibd file must match the space id
|
|
of the table in the data dictionary.
|
|
@return error code or DB_SUCCESS */
|
|
UNIV_INTERN
|
|
int
|
|
row_import_tablespace_for_mysql(
|
|
/*============================*/
|
|
const char* name, /*!< in: table name */
|
|
trx_t* trx); /*!< in: transaction handle */
|
|
/*********************************************************************//**
|
|
Drops a database for MySQL.
|
|
@return error code or DB_SUCCESS */
|
|
UNIV_INTERN
|
|
int
|
|
row_drop_database_for_mysql(
|
|
/*========================*/
|
|
const char* name, /*!< in: database name which ends to '/' */
|
|
trx_t* trx); /*!< in: transaction handle */
|
|
/*********************************************************************//**
|
|
Renames a table for MySQL.
|
|
@return error code or DB_SUCCESS */
|
|
UNIV_INTERN
|
|
ulint
|
|
row_rename_table_for_mysql(
|
|
/*=======================*/
|
|
const char* old_name, /*!< in: old table name */
|
|
const char* new_name, /*!< in: new table name */
|
|
trx_t* trx, /*!< in: transaction handle */
|
|
ibool commit); /*!< in: if TRUE then commit trx */
|
|
/*********************************************************************//**
|
|
Checks that the index contains entries in an ascending order, unique
|
|
constraint is not broken, and calculates the number of index entries
|
|
in the read view of the current transaction.
|
|
@return DB_SUCCESS if ok */
|
|
UNIV_INTERN
|
|
ulint
|
|
row_check_index_for_mysql(
|
|
/*======================*/
|
|
row_prebuilt_t* prebuilt, /*!< in: prebuilt struct
|
|
in MySQL handle */
|
|
const dict_index_t* index, /*!< in: index */
|
|
ulint* n_rows); /*!< out: number of entries
|
|
seen in the consistent read */
|
|
|
|
/*********************************************************************//**
|
|
Determines if a table is a magic monitor table.
|
|
@return TRUE if monitor table */
|
|
UNIV_INTERN
|
|
ibool
|
|
row_is_magic_monitor_table(
|
|
/*=======================*/
|
|
const char* table_name); /*!< in: name of the table, in the
|
|
form database/table_name */
|
|
|
|
/* A struct describing a place for an individual column in the MySQL
|
|
row format which is presented to the table handler in ha_innobase.
|
|
This template struct is used to speed up row transformations between
|
|
Innobase and MySQL. */
|
|
|
|
typedef struct mysql_row_templ_struct mysql_row_templ_t;
|
|
struct mysql_row_templ_struct {
|
|
ulint col_no; /*!< column number of the column */
|
|
ulint rec_field_no; /*!< field number of the column in an
|
|
Innobase record in the current index;
|
|
not defined if template_type is
|
|
ROW_MYSQL_WHOLE_ROW */
|
|
ulint clust_rec_field_no; /*!< field number of the column in an
|
|
Innobase record in the clustered index;
|
|
not defined if template_type is
|
|
ROW_MYSQL_WHOLE_ROW */
|
|
ulint mysql_col_offset; /*!< offset of the column in the MySQL
|
|
row format */
|
|
ulint mysql_col_len; /*!< length of the column in the MySQL
|
|
row format */
|
|
ulint mysql_null_byte_offset; /*!< MySQL NULL bit byte offset in a
|
|
MySQL record */
|
|
ulint mysql_null_bit_mask; /*!< bit mask to get the NULL bit,
|
|
zero if column cannot be NULL */
|
|
ulint type; /*!< column type in Innobase mtype
|
|
numbers DATA_CHAR... */
|
|
ulint mysql_type; /*!< MySQL type code; this is always
|
|
< 256 */
|
|
ulint mysql_length_bytes; /*!< if mysql_type
|
|
== DATA_MYSQL_TRUE_VARCHAR, this tells
|
|
whether we should use 1 or 2 bytes to
|
|
store the MySQL true VARCHAR data
|
|
length at the start of row in the MySQL
|
|
format (NOTE that the MySQL key value
|
|
format always uses 2 bytes for the data
|
|
len) */
|
|
ulint charset; /*!< MySQL charset-collation code
|
|
of the column, or zero */
|
|
ulint mbminlen; /*!< minimum length of a char, in bytes,
|
|
or zero if not a char type */
|
|
ulint mbmaxlen; /*!< maximum length of a char, in bytes,
|
|
or zero if not a char type */
|
|
ulint is_unsigned; /*!< if a column type is an integer
|
|
type and this field is != 0, then
|
|
it is an unsigned integer type */
|
|
};
|
|
|
|
#define MYSQL_FETCH_CACHE_SIZE 8
|
|
/* After fetching this many rows, we start caching them in fetch_cache */
|
|
#define MYSQL_FETCH_CACHE_THRESHOLD 4
|
|
|
|
#define ROW_PREBUILT_ALLOCATED 78540783
|
|
#define ROW_PREBUILT_FREED 26423527
|
|
|
|
/** A struct for (sometimes lazily) prebuilt structures in an Innobase table
|
|
handle used within MySQL; these are used to save CPU time. */
|
|
|
|
struct row_prebuilt_struct {
|
|
ulint magic_n; /*!< this magic number is set to
|
|
ROW_PREBUILT_ALLOCATED when created,
|
|
or ROW_PREBUILT_FREED when the
|
|
struct has been freed */
|
|
dict_table_t* table; /*!< Innobase table handle */
|
|
dict_index_t* index; /*!< current index for a search, if
|
|
any */
|
|
trx_t* trx; /*!< current transaction handle */
|
|
unsigned sql_stat_start:1;/*!< TRUE when we start processing of
|
|
an SQL statement: we may have to set
|
|
an intention lock on the table,
|
|
create a consistent read view etc. */
|
|
unsigned mysql_has_locked:1;/*!< this is set TRUE when MySQL
|
|
calls external_lock on this handle
|
|
with a lock flag, and set FALSE when
|
|
with the F_UNLOCK flag */
|
|
unsigned clust_index_was_generated:1;
|
|
/*!< if the user did not define a
|
|
primary key in MySQL, then Innobase
|
|
automatically generated a clustered
|
|
index where the ordering column is
|
|
the row id: in this case this flag
|
|
is set to TRUE */
|
|
unsigned index_usable:1; /*!< caches the value of
|
|
row_merge_is_index_usable(trx,index) */
|
|
unsigned read_just_key:1;/*!< set to 1 when MySQL calls
|
|
ha_innobase::extra with the
|
|
argument HA_EXTRA_KEYREAD; it is enough
|
|
to read just columns defined in
|
|
the index (i.e., no read of the
|
|
clustered index record necessary) */
|
|
unsigned used_in_HANDLER:1;/*!< TRUE if we have been using this
|
|
handle in a MySQL HANDLER low level
|
|
index cursor command: then we must
|
|
store the pcur position even in a
|
|
unique search from a clustered index,
|
|
because HANDLER allows NEXT and PREV
|
|
in such a situation */
|
|
unsigned template_type:2;/*!< ROW_MYSQL_WHOLE_ROW,
|
|
ROW_MYSQL_REC_FIELDS,
|
|
ROW_MYSQL_DUMMY_TEMPLATE, or
|
|
ROW_MYSQL_NO_TEMPLATE */
|
|
unsigned n_template:10; /*!< number of elements in the
|
|
template */
|
|
unsigned null_bitmap_len:10;/*!< number of bytes in the SQL NULL
|
|
bitmap at the start of a row in the
|
|
MySQL format */
|
|
unsigned need_to_access_clustered:1; /*!< if we are fetching
|
|
columns through a secondary index
|
|
and at least one column is not in
|
|
the secondary index, then this is
|
|
set to TRUE */
|
|
unsigned templ_contains_blob:1;/*!< TRUE if the template contains
|
|
a column with DATA_BLOB ==
|
|
get_innobase_type_from_mysql_type();
|
|
not to be confused with InnoDB
|
|
externally stored columns
|
|
(VARCHAR can be off-page too) */
|
|
mysql_row_templ_t* mysql_template;/*!< template used to transform
|
|
rows fast between MySQL and Innobase
|
|
formats; memory for this template
|
|
is not allocated from 'heap' */
|
|
mem_heap_t* heap; /*!< memory heap from which
|
|
these auxiliary structures are
|
|
allocated when needed */
|
|
ins_node_t* ins_node; /*!< Innobase SQL insert node
|
|
used to perform inserts
|
|
to the table */
|
|
byte* ins_upd_rec_buff;/*!< buffer for storing data converted
|
|
to the Innobase format from the MySQL
|
|
format */
|
|
const byte* default_rec; /*!< the default values of all columns
|
|
(a "default row") in MySQL format */
|
|
ulint hint_need_to_fetch_extra_cols;
|
|
/*!< normally this is set to 0; if this
|
|
is set to ROW_RETRIEVE_PRIMARY_KEY,
|
|
then we should at least retrieve all
|
|
columns in the primary key; if this
|
|
is set to ROW_RETRIEVE_ALL_COLS, then
|
|
we must retrieve all columns in the
|
|
key (if read_just_key == 1), or all
|
|
columns in the table */
|
|
upd_node_t* upd_node; /*!< Innobase SQL update node used
|
|
to perform updates and deletes */
|
|
que_fork_t* ins_graph; /*!< Innobase SQL query graph used
|
|
in inserts */
|
|
que_fork_t* upd_graph; /*!< Innobase SQL query graph used
|
|
in updates or deletes */
|
|
btr_pcur_t* pcur; /*!< persistent cursor used in selects
|
|
and updates */
|
|
btr_pcur_t* clust_pcur; /*!< persistent cursor used in
|
|
some selects and updates */
|
|
que_fork_t* sel_graph; /*!< dummy query graph used in
|
|
selects */
|
|
dtuple_t* search_tuple; /*!< prebuilt dtuple used in selects */
|
|
byte row_id[DATA_ROW_ID_LEN];
|
|
/*!< if the clustered index was
|
|
generated, the row id of the
|
|
last row fetched is stored
|
|
here */
|
|
dtuple_t* clust_ref; /*!< prebuilt dtuple used in
|
|
sel/upd/del */
|
|
ulint select_lock_type;/*!< LOCK_NONE, LOCK_S, or LOCK_X */
|
|
ulint stored_select_lock_type;/*!< this field is used to
|
|
remember the original select_lock_type
|
|
that was decided in ha_innodb.cc,
|
|
::store_lock(), ::external_lock(),
|
|
etc. */
|
|
ulint row_read_type; /*!< ROW_READ_WITH_LOCKS if row locks
|
|
should be the obtained for records
|
|
under an UPDATE or DELETE cursor.
|
|
If innodb_locks_unsafe_for_binlog
|
|
is TRUE, this can be set to
|
|
ROW_READ_TRY_SEMI_CONSISTENT, so that
|
|
if the row under an UPDATE or DELETE
|
|
cursor was locked by another
|
|
transaction, InnoDB will resort
|
|
to reading the last committed value
|
|
('semi-consistent read'). Then,
|
|
this field will be set to
|
|
ROW_READ_DID_SEMI_CONSISTENT to
|
|
indicate that. If the row does not
|
|
match the WHERE condition, MySQL will
|
|
invoke handler::unlock_row() to
|
|
clear the flag back to
|
|
ROW_READ_TRY_SEMI_CONSISTENT and
|
|
to simply skip the row. If
|
|
the row matches, the next call to
|
|
row_search_for_mysql() will lock
|
|
the row.
|
|
This eliminates lock waits in some
|
|
cases; note that this breaks
|
|
serializability. */
|
|
ulint new_rec_locks; /*!< normally 0; if
|
|
srv_locks_unsafe_for_binlog is
|
|
TRUE or session is using READ
|
|
COMMITTED or READ UNCOMMITTED
|
|
isolation level, set in
|
|
row_search_for_mysql() if we set a new
|
|
record lock on the secondary
|
|
or clustered index; this is
|
|
used in row_unlock_for_mysql()
|
|
when releasing the lock under
|
|
the cursor if we determine
|
|
after retrieving the row that
|
|
it does not need to be locked
|
|
('mini-rollback') */
|
|
ulint mysql_prefix_len;/*!< byte offset of the end of
|
|
the last requested column */
|
|
ulint mysql_row_len; /*!< length in bytes of a row in the
|
|
MySQL format */
|
|
ulint n_rows_fetched; /*!< number of rows fetched after
|
|
positioning the current cursor */
|
|
ulint fetch_direction;/*!< ROW_SEL_NEXT or ROW_SEL_PREV */
|
|
byte* fetch_cache[MYSQL_FETCH_CACHE_SIZE];
|
|
/*!< a cache for fetched rows if we
|
|
fetch many rows from the same cursor:
|
|
it saves CPU time to fetch them in a
|
|
batch; we reserve mysql_row_len
|
|
bytes for each such row; these
|
|
pointers point 4 bytes past the
|
|
allocated mem buf start, because
|
|
there is a 4 byte magic number at the
|
|
start and at the end */
|
|
ibool keep_other_fields_on_keyread; /*!< when using fetch
|
|
cache with HA_EXTRA_KEYREAD, don't
|
|
overwrite other fields in mysql row
|
|
row buffer.*/
|
|
ulint fetch_cache_first;/*!< position of the first not yet
|
|
fetched row in fetch_cache */
|
|
ulint n_fetch_cached; /*!< number of not yet fetched rows
|
|
in fetch_cache */
|
|
mem_heap_t* blob_heap; /*!< in SELECTS BLOB fields are copied
|
|
to this heap */
|
|
mem_heap_t* old_vers_heap; /*!< memory heap where a previous
|
|
version is built in consistent read */
|
|
/*----------------------*/
|
|
ulonglong autoinc_last_value;
|
|
/*!< last value of AUTO-INC interval */
|
|
ulonglong autoinc_increment;/*!< The increment step of the auto
|
|
increment column. Value must be
|
|
greater than or equal to 1. Required to
|
|
calculate the next value */
|
|
ulonglong autoinc_offset; /*!< The offset passed to
|
|
get_auto_increment() by MySQL. Required
|
|
to calculate the next value */
|
|
ulint autoinc_error; /*!< The actual error code encountered
|
|
while trying to init or read the
|
|
autoinc value from the table. We
|
|
store it here so that we can return
|
|
it to MySQL */
|
|
/*----------------------*/
|
|
ulint magic_n2; /*!< this should be the same as
|
|
magic_n */
|
|
};
|
|
|
|
#define ROW_PREBUILT_FETCH_MAGIC_N 465765687
|
|
|
|
#define ROW_MYSQL_WHOLE_ROW 0
|
|
#define ROW_MYSQL_REC_FIELDS 1
|
|
#define ROW_MYSQL_NO_TEMPLATE 2
|
|
#define ROW_MYSQL_DUMMY_TEMPLATE 3 /* dummy template used in
|
|
row_scan_and_check_index */
|
|
|
|
/* Values for hint_need_to_fetch_extra_cols */
|
|
#define ROW_RETRIEVE_PRIMARY_KEY 1
|
|
#define ROW_RETRIEVE_ALL_COLS 2
|
|
|
|
/* Values for row_read_type */
|
|
#define ROW_READ_WITH_LOCKS 0
|
|
#define ROW_READ_TRY_SEMI_CONSISTENT 1
|
|
#define ROW_READ_DID_SEMI_CONSISTENT 2
|
|
|
|
#ifndef UNIV_NONINL
|
|
#include "row0mysql.ic"
|
|
#endif
|
|
|
|
#endif
|