src/libmysql_std/include/merge.h

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/* Copyright (C) 2000 MySQL AB

   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; either version 2 of the License, or
   (at your option) any later version.

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* This file should be included when using merge_isam_funktions */
/* Author: Michael Widenius */

#ifndef _merge_h
#define _merge_h
#ifdef  __cplusplus
extern "C" {
#endif

#ifndef _my_base_h
#include <my_base.h>
#endif
#ifndef _nisam_h
#include <nisam.h>
#endif

#define MRG_NAME_EXT    ".MRG"

        /* Param to/from mrg_info */

typedef struct st_mrg_info              /* Struct from h_info */
{
  ulonglong records;                    /* Records in database */
  ulonglong deleted;                    /* Deleted records in database */
  ulonglong recpos;                     /* Pos for last used record */
  ulonglong data_file_length;
  uint  reclength;                      /* Recordlength */
  int   errkey;                         /* With key was dupplicated on err */
  uint  options;                        /* HA_OPTION_... used */
} MERGE_INFO;

typedef struct st_mrg_table_info
{
  N_INFO *table;
  ulonglong file_offset;
} MRG_TABLE;

typedef struct st_merge
{
  MRG_TABLE *open_tables,*current_table,*end_table,*last_used_table;
  ulonglong records;                    /* records in tables */
  ulonglong del;                        /* Removed records */
  ulonglong data_file_length;
  uint   tables,options,reclength;
  my_bool cache_in_use;
  LIST  open_list;
} MRG_INFO;

typedef ulong mrg_off_t;

        /* Prototypes for merge-functions */

extern int mrg_close(MRG_INFO *file);
extern int mrg_delete(MRG_INFO *file,const byte *buff);
extern MRG_INFO *mrg_open(const char *name,int mode,int wait_if_locked);
extern int mrg_panic(enum ha_panic_function function);
extern int mrg_rfirst(MRG_INFO *file,byte *buf,int inx);
extern int mrg_rkey(MRG_INFO *file,byte *buf,int inx,const byte *key,
                       uint key_len, enum ha_rkey_function search_flag);
extern int mrg_rrnd(MRG_INFO *file,byte *buf, mrg_off_t pos);
extern int mrg_rsame(MRG_INFO *file,byte *record,int inx);
extern int mrg_update(MRG_INFO *file,const byte *old,const byte *new_rec);
extern int mrg_info(MRG_INFO *file,MERGE_INFO *x,int flag);
extern int mrg_lock_database(MRG_INFO *file,int lock_type);
extern int mrg_create(const char *name,const char **table_names);
extern int mrg_extra(MRG_INFO *file,enum ha_extra_function function);
extern ha_rows mrg_records_in_range(MRG_INFO *info,int inx,
                                    const byte *start_key,uint start_key_len,
                                    enum ha_rkey_function start_search_flag,
                                    const byte *end_key,uint end_key_len,
                                    enum ha_rkey_function end_search_flag);

extern mrg_off_t mrg_position(MRG_INFO *info);
#ifdef  __cplusplus
}
#endif
#endif