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Viewing changes to plugin/innobase/include/row0mysql.h

  • Committer: Brian Aker
  • Date: 2010-11-19 20:09:58 UTC
  • mfrom: (1938.2.1 bug673579)
  • Revision ID: brian@tangent.org-20101119200958-anlloqi9va5gu4c7
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plugin/innobase/include/row0mysql.h
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/*****************************************************************************
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Copyright (C) 2000, 2010, Innobase Oy. All Rights Reserved.
 
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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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        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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        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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This can only be used when srv_locks_unsafe_for_binlog is TRUE or
 
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session is using a READ COMMITTED isolation level. Before
 
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calling this function we must use trx_reset_new_rec_lock_info() and
 
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trx_register_new_rec_lock() to store the information which new record locks
 
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really were set. This function removes a newly set lock under prebuilt->pcur,
 
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and also under prebuilt->clust_pcur. Currently, this is only used and tested
 
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in the case of an UPDATE or a DELETE statement, where the row lock is of the
 
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LOCK_X type.
 
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Thus, this implements a 'mini-rollback' that releases the latest record
 
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locks 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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        row_prebuilt_t* prebuilt,       /*!< in: 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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        ibool           has_latches_on_recs);/*!< TRUE if called so that we have
 
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                                        the latches on the records under pcur
 
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                                        and clust_pcur, and we do not need to
 
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                                        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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                                        Innobase record in the current index;
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                                        not defined if template_type is
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                                        ROW_MYSQL_WHOLE_ROW */
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        ulint   clust_rec_field_no;     /*!< field number of the column in an
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                                        Innobase record in the clustered index;
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                                        not defined if template_type is
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                                        ROW_MYSQL_WHOLE_ROW */
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        ulint   mysql_col_offset;       /*!< offset of the column in the MySQL
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                                        row format */
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        ulint   mysql_col_len;          /*!< length of the column in the MySQL
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                                        the secondary index, then this is
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                                        set to TRUE */
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        unsigned        templ_contains_blob:1;/*!< TRUE if the template contains
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                                        a column with DATA_BLOB ==
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                                        get_innobase_type_from_mysql_type();
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                                        not to be confused with InnoDB
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                                        externally stored columns
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                                        (VARCHAR can be off-page too) */
 
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                                        BLOB column(s) */
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        mysql_row_templ_t* mysql_template;/*!< template used to transform
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                                        rows fast between MySQL and Innobase
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                                        formats; memory for this template
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        ulint           new_rec_locks;  /*!< normally 0; if
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                                        srv_locks_unsafe_for_binlog is
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                                        TRUE or session is using READ
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                                        COMMITTED or READ UNCOMMITTED
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                                        isolation level, set in
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                                        row_search_for_mysql() if we set a new
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                                        record lock on the secondary
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                                        or clustered index; this is
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                                        used in row_unlock_for_mysql()
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                                        when releasing the lock under
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                                        the cursor if we determine
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                                        after retrieving the row that
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                                        it does not need to be locked
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                                        ('mini-rollback') */
 
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                                        COMMITTED isolation level, in a
 
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                                        cursor search, if we set a new
 
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                                        record lock on an index, this is
 
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                                        incremented; this is used in
 
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                                        releasing the locks under the
 
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                                        cursors if we are performing an
 
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                                        UPDATE and we determine after
 
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                                        retrieving the row that it does
 
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                                        not need to be locked; thus,
 
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                                        these can be used to implement a
 
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                                        'mini-rollback' that releases
 
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                                        the latest record locks */
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        ulint           mysql_prefix_len;/*!< byte offset of the end of
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                                        the last requested column */
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        ulint           mysql_row_len;  /*!< length in bytes of a row in the