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104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
#ifndef SQL_RECORDS_H
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#define SQL_RECORDS_H
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/* Copyright (c) 2008, 2010, 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
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#endif
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#include "table.h"
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struct st_join_table;
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class handler;
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class THD;
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class SQL_SELECT;
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class Copy_field;
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class SORT_INFO;
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struct READ_RECORD;
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void end_read_record(READ_RECORD *info);
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void free_cache(READ_RECORD *info);
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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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READ_RECORD read_record;
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init_read_record(&read_record, ...);
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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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*/
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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)(st_join_table *);
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typedef int (*Setup_func)(struct st_join_table*);
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TABLE *table; /* Head-form */
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Unlock_row_func unlock_row;
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Read_func read_record_func;
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Read_func read_record_func_and_unpack_calls;
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THD *thd;
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SQL_SELECT *select;
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uint ref_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 *rec_buf; /* to read field values after filesort */
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uchar *cache,*cache_pos,*cache_end,*read_positions;
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/*
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Structure storing information about sorting
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*/
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SORT_INFO *sort_info;
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struct st_io_cache *io_cache;
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bool print_error;
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int read_record() { return read_record_func(this); }
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uchar *record() const { return table->record[0]; }
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/*
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SJ-Materialization runtime may need to read fields from the materialized
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table and unpack them into original table fields:
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*/
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Copy_field *copy_field;
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Copy_field *copy_field_end;
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public:
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READ_RECORD() : table(NULL), cache(NULL) {}
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~READ_RECORD() { end_read_record(this); }
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};
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bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form,
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SQL_SELECT *select, SORT_INFO *sort,
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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 rr_unlock_row(st_join_table *tab);
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#endif /* SQL_RECORDS_H */
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