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#ifndef SQL_RECORDS_H #define SQL_RECORDS_H /* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ #ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class implementation */ #endif #include "table.h" struct st_join_table; class handler; class THD; class SQL_SELECT; class Copy_field; class SORT_INFO; struct READ_RECORD; void end_read_record(READ_RECORD *info); void free_cache(READ_RECORD *info); /** A context for reading through a single table using a chosen access method: index read, scan, etc, use of cache, etc. Use by: READ_RECORD read_record; init_read_record(&read_record, ...); while (read_record.read_record()) { ... } end_read_record(); */ struct READ_RECORD { typedef int (*Read_func)(READ_RECORD*); typedef void (*Unlock_row_func)(st_join_table *); typedef int (*Setup_func)(struct st_join_table*); TABLE *table; /* Head-form */ Unlock_row_func unlock_row; Read_func read_record_func; Read_func read_record_func_and_unpack_calls; THD *thd; SQL_SELECT *select; uint ref_length, reclength, rec_cache_size, error_offset; /** Counting records when reading result from filesort(). Used when filesort leaves the result in the filesort buffer. */ ha_rows unpack_counter; uchar *ref_pos; /* pointer to form->refpos */ uchar *rec_buf; /* to read field values after filesort */ uchar *cache,*cache_pos,*cache_end,*read_positions; /* Structure storing information about sorting */ SORT_INFO *sort_info; struct st_io_cache *io_cache; bool print_error; int read_record() { return read_record_func(this); } uchar *record() const { return table->record[0]; } /* SJ-Materialization runtime may need to read fields from the materialized table and unpack them into original table fields: */ Copy_field *copy_field; Copy_field *copy_field_end; public: READ_RECORD() : table(NULL), cache(NULL) {} ~READ_RECORD() { end_read_record(this); } }; bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form, SQL_SELECT *select, SORT_INFO *sort, int use_record_cache, bool print_errors, bool disable_rr_cache); bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table, bool print_error, uint idx, bool reverse); void rr_unlock_row(st_join_table *tab); #endif /* SQL_RECORDS_H */
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