89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
#ifndef SQL_RECORDS_H
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#define SQL_RECORDS_H
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/* Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#include <my_global.h> /* for uint typedefs */
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#include "my_base.h"
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class QEP_TAB;
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class handler;
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struct TABLE;
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class THD;
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/**
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A context for reading through a single table using a chosen access method:
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index read, scan, etc, use of cache, etc.
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Use by:
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@code
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READ_RECORD read_record;
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if (init_read_record(&read_record, ...))
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return TRUE;
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while (read_record.read_record())
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{
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...
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}
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end_read_record();
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@endcode
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*/
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class QUICK_SELECT_I;
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struct READ_RECORD
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{
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typedef int (*Read_func)(READ_RECORD*);
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typedef void (*Unlock_row_func)(QEP_TAB *);
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typedef int (*Setup_func)(QEP_TAB*);
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TABLE *table; /* Head-form */
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TABLE **forms; /* head and ref forms */
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Unlock_row_func unlock_row;
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Read_func read_record;
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THD *thd;
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QUICK_SELECT_I *quick;
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uint cache_records;
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uint ref_length,struct_length,reclength,rec_cache_size,error_offset;
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/**
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Counting records when reading result from filesort().
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Used when filesort leaves the result in the filesort buffer.
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*/
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ha_rows unpack_counter;
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uchar *ref_pos; /* pointer to form->refpos */
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uchar *record;
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uchar *rec_buf; /* to read field values after filesort */
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uchar *cache,*cache_pos,*cache_end,*read_positions;
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struct st_io_cache *io_cache;
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bool print_error, ignore_not_found_rows;
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public:
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READ_RECORD() { memset(this, 0, sizeof(*this)); }
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};
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bool init_read_record(READ_RECORD *info, THD *thd,
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TABLE *table, QEP_TAB *qep_tab,
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int use_record_cache,
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bool print_errors, bool disable_rr_cache);
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bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
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bool print_error, uint idx, bool reverse);
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void end_read_record(READ_RECORD *info);
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void rr_unlock_row(QEP_TAB *tab);
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int rr_sequential(READ_RECORD *info);
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#endif /* SQL_RECORDS_H */
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