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ha_isam.cpp
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2000-09-26
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
#ifdef __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include <m_ctype.h>
#include <myisampack.h>
#include "ha_isam.h"
#ifndef MASTER
#include "../srclib/isam/isamdef.h"
#else
#include "../isam/isamdef.h"
#endif
/*****************************************************************************
** isam tables
*****************************************************************************/
const char **ha_isam::bas_ext() const
{ static const char *ext[]= { ".ISD",".ISM", NullS }; return ext; }
int ha_isam::open(const char *name, int mode, uint test_if_locked)
{
char name_buff[FN_REFLEN];
if (!(file=nisam_open(fn_format(name_buff,name,"","",2 | 4), mode,
test_if_locked)))
return (my_errno ? my_errno : -1);
if (!(test_if_locked == HA_OPEN_WAIT_IF_LOCKED ||
test_if_locked == HA_OPEN_ABORT_IF_LOCKED))
(void) nisam_extra(file,HA_EXTRA_NO_WAIT_LOCK);
info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
if (!(test_if_locked & HA_OPEN_WAIT_IF_LOCKED))
(void) nisam_extra(file,HA_EXTRA_WAIT_LOCK);
if (!table->db_record_offset)
int_option_flag|=HA_REC_NOT_IN_SEQ;
return (0);
}
int ha_isam::close(void)
{
return !nisam_close(file) ? 0 : my_errno ? my_errno : -1;
}
uint ha_isam::min_record_length(uint options) const
{
return (options & HA_OPTION_PACK_RECORD) ? 1 : 5;
}
int ha_isam::write_row(byte * buf)
{
statistic_increment(ha_write_count,&LOCK_status);
if (table->time_stamp)
update_timestamp(buf+table->time_stamp-1);
if (table->next_number_field && buf == table->record[0])
update_auto_increment();
return !nisam_write(file,buf) ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::update_row(const byte * old_data, byte * new_data)
{
statistic_increment(ha_update_count,&LOCK_status);
if (table->time_stamp)
update_timestamp(new_data+table->time_stamp-1);
return !nisam_update(file,old_data,new_data) ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::delete_row(const byte * buf)
{
statistic_increment(ha_delete_count,&LOCK_status);
return !nisam_delete(file,buf) ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::index_read(byte * buf, const byte * key,
uint key_len, enum ha_rkey_function find_flag)
{
statistic_increment(ha_read_key_count,&LOCK_status);
int error=nisam_rkey(file, buf, active_index, key, key_len, find_flag);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::index_read_idx(byte * buf, uint index, const byte * key,
uint key_len, enum ha_rkey_function find_flag)
{
statistic_increment(ha_read_key_count,&LOCK_status);
int error=nisam_rkey(file, buf, index, key, key_len, find_flag);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::index_next(byte * buf)
{
statistic_increment(ha_read_next_count,&LOCK_status);
int error=nisam_rnext(file,buf,active_index);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : HA_ERR_END_OF_FILE;
}
int ha_isam::index_prev(byte * buf)
{
statistic_increment(ha_read_prev_count,&LOCK_status);
int error=nisam_rprev(file,buf, active_index);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : HA_ERR_END_OF_FILE;
}
int ha_isam::index_first(byte * buf)
{
statistic_increment(ha_read_first_count,&LOCK_status);
int error=nisam_rfirst(file, buf, active_index);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : HA_ERR_END_OF_FILE;
}
int ha_isam::index_last(byte * buf)
{
statistic_increment(ha_read_last_count,&LOCK_status);
int error=nisam_rlast(file, buf, active_index);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : HA_ERR_END_OF_FILE;
}
int ha_isam::rnd_init(bool scan)
{
return nisam_extra(file,HA_EXTRA_RESET) ? 0 : my_errno ? my_errno : -1;;
}
int ha_isam::rnd_next(byte *buf)
{
statistic_increment(ha_read_rnd_next_count,&LOCK_status);
int error=nisam_rrnd(file, buf, NI_POS_ERROR);
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : -1;
}
int ha_isam::rnd_pos(byte * buf, byte *pos)
{
statistic_increment(ha_read_rnd_count,&LOCK_status);
int error=nisam_rrnd(file, buf, (ulong) ha_get_ptr(pos,ref_length));
table->status=error ? STATUS_NOT_FOUND: 0;
return !error ? 0 : my_errno ? my_errno : -1;
}
void ha_isam::position(const byte *record)
{
my_off_t position=nisam_position(file);
if (position == (my_off_t) ~ (ulong) 0)
position=HA_OFFSET_ERROR;
ha_store_ptr(ref, ref_length, position);
}
void ha_isam::info(uint flag)
{
N_ISAMINFO info;
(void) nisam_info(file,&info,flag);
if (flag & HA_STATUS_VARIABLE)
{
records = info.records;
deleted = info.deleted;
data_file_length=info.data_file_length;
index_file_length=info.index_file_length;
delete_length = info.delete_length;
check_time = info.isamchk_time;
mean_rec_length=info.mean_reclength;
}
if (flag & HA_STATUS_CONST)
{
max_data_file_length=info.max_data_file_length;
max_index_file_length=info.max_index_file_length;
create_time = info.create_time;
sortkey = info.sortkey;
block_size=nisam_block_size;
table->keys = min(table->keys,info.keys);
table->keys_in_use= (((key_map) 1) << table->keys)- (key_map) 1;
table->db_options_in_use= info.options;
table->db_record_offset=
(table->db_options_in_use &
(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ? 0 :
table->reclength;
if (!table->tmp_table)
{
ulong *rec_per_key=info.rec_per_key;
for (uint i=0 ; i < table->keys ; i++)
{
table->key_info[i].rec_per_key[table->key_info[i].key_parts-1]=
*(rec_per_key++);
}
}
ref_length=4;
}
if (flag & HA_STATUS_ERRKEY)
{
errkey = info.errkey;
ha_store_ptr(dupp_ref, ref_length, info.dupp_key_pos);
}
if (flag & HA_STATUS_TIME)
update_time = info.update_time;
}
int ha_isam::extra(enum ha_extra_function operation)
{
if ((specialflag & SPECIAL_SAFE_MODE || test_flags & TEST_NO_EXTRA) &&
(operation == HA_EXTRA_WRITE_CACHE ||
operation == HA_EXTRA_KEYREAD))
return 0;
return nisam_extra(file,operation);
}
int ha_isam::reset(void)
{
return nisam_extra(file,HA_EXTRA_RESET);
}
int ha_isam::external_lock(THD *thd, int lock_type)
{
return nisam_lock_database(file,lock_type);
}
THR_LOCK_DATA **ha_isam::store_lock(THD *thd,
THR_LOCK_DATA **to,
enum thr_lock_type lock_type)
{
if (lock_type != TL_IGNORE && file->lock.type == TL_UNLOCK)
file->lock.type=lock_type;
*to++= &file->lock;
return to;
}
int ha_isam::create(const char *name, register TABLE *form,
HA_CREATE_INFO *create_info)
{
uint options=form->db_options_in_use;
int error;
uint i,j,recpos,minpos,fieldpos,temp_length,length;
enum ha_base_keytype type;
char buff[FN_REFLEN];
KEY *pos;
N_KEYDEF keydef[MAX_KEY];
N_RECINFO *recinfo,*recinfo_pos;
DBUG_ENTER("ha_isam::create");
type=HA_KEYTYPE_BINARY; // Keep compiler happy
if (!(recinfo= (N_RECINFO*) my_malloc((form->fields*2+2)*sizeof(N_RECINFO),
MYF(MY_WME))))
DBUG_RETURN(1);
pos=form->key_info;
for (i=0; i < form->keys ; i++, pos++)
{
keydef[i].base.flag= (pos->flags & HA_NOSAME);
for (j=0 ; (int7) j < pos->key_parts ; j++)
{
keydef[i].seg[j].base.flag=pos->key_part[j].key_part_flag;
Field *field=pos->key_part[j].field;
type=field->key_type();
if ((options & HA_OPTION_PACK_KEYS ||
(pos->flags & (HA_PACK_KEY | HA_BINARY_PACK_KEY |
HA_SPACE_PACK_USED))) &&
pos->key_part[j].length > 8 &&
(type == HA_KEYTYPE_TEXT ||
type == HA_KEYTYPE_NUM ||
(type == HA_KEYTYPE_BINARY && !field->zero_pack())))
{
if (j == 0)
keydef[i].base.flag|=HA_PACK_KEY;
if (!(field->flags & ZEROFILL_FLAG) &&
(field->type() == FIELD_TYPE_STRING ||
field->type() == FIELD_TYPE_VAR_STRING ||
((int) (pos->key_part[j].length - field->decimals()))
>= 4))
keydef[i].seg[j].base.flag|=HA_SPACE_PACK;
}
keydef[i].seg[j].base.type=(int) type;
keydef[i].seg[j].base.start= pos->key_part[j].offset;
keydef[i].seg[j].base.length= pos->key_part[j].length;
}
keydef[i].seg[j].base.type=(int) HA_KEYTYPE_END; /* End of key-parts */
}
recpos=0; recinfo_pos=recinfo;
while (recpos < (uint) form->reclength)
{
Field **field,*found=0;
minpos=form->reclength; length=0;
for (field=form->field ; *field ; field++)
{
if ((fieldpos=(*field)->offset()) >= recpos &&
fieldpos <= minpos)
{
/* skip null fields */
if (!(temp_length= (*field)->pack_length()))
continue; /* Skipp null-fields */
if (! found || fieldpos < minpos ||
(fieldpos == minpos && temp_length < length))
{
minpos=fieldpos; found= *field; length=temp_length;
}
}
}
DBUG_PRINT("loop",("found: %lx recpos: %d minpos: %d length: %d",
found,recpos,minpos,length));
if (recpos != minpos)
{ // Reserved space (Null bits?)
recinfo_pos->base.type=(int) FIELD_NORMAL;
recinfo_pos++->base.length= (uint16) (minpos-recpos);
}
if (! found)
break;
if (found->flags & BLOB_FLAG)
{
/* ISAM can only handle blob pointers of sizeof(char(*)) */
recinfo_pos->base.type= (int) FIELD_BLOB;
if (options & HA_OPTION_LONG_BLOB_PTR)
length= length-portable_sizeof_char_ptr+sizeof(char*);
}
else if (!(options & HA_OPTION_PACK_RECORD))
recinfo_pos->base.type= (int) FIELD_NORMAL;
else if (found->zero_pack())
recinfo_pos->base.type= (int) FIELD_SKIPP_ZERO;
else
recinfo_pos->base.type= (int) ((length <= 3 ||
(found->flags & ZEROFILL_FLAG)) ?
FIELD_NORMAL :
found->type() == FIELD_TYPE_STRING ||
found->type() == FIELD_TYPE_VAR_STRING ?
FIELD_SKIPP_ENDSPACE :
FIELD_SKIPP_PRESPACE);
recinfo_pos++ ->base.length=(uint16) length;
recpos=minpos+length;
DBUG_PRINT("loop",("length: %d type: %d",
recinfo_pos[-1].base.length,recinfo_pos[-1].base.type));
if ((found->flags & BLOB_FLAG) && (options & HA_OPTION_LONG_BLOB_PTR) &&
sizeof(char*) != portable_sizeof_char_ptr)
{ // Not used space
recinfo_pos->base.type=(int) FIELD_ZERO;
recinfo_pos++->base.length=
(uint16) (portable_sizeof_char_ptr-sizeof(char*));
recpos+= (portable_sizeof_char_ptr-sizeof(char*));
}
}
recinfo_pos->base.type= (int) FIELD_LAST; /* End of fieldinfo */
error=nisam_create(fn_format(buff,name,"","",2+4+16),form->keys,keydef,
recinfo,form->max_rows,form->min_rows,0,0,0L);
my_free((gptr) recinfo,MYF(0));
DBUG_RETURN(error);
}
ha_rows ha_isam::records_in_range(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)
{
return (ha_rows) nisam_records_in_range(file,
inx,
start_key,start_key_len,
start_search_flag,
end_key,end_key_len,
end_search_flag);
}