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/* Copyright (C) 2000,2004 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
remove all records from database
Identical as hp_create() and hp_open() but used HP_SHARE* instead of name and
database remains open.
*/
#include "heapdef.h"
void heap_clear(HP_INFO *info)
{
hp_clear(info->s);
}
void hp_clear(HP_SHARE *info)
{
DBUG_ENTER("hp_clear");
if (info->block.levels)
VOID(hp_free_level(&info->block,info->block.levels,info->block.root,
(byte*) 0));
info->block.levels=0;
hp_clear_keys(info);
info->records= info->deleted= 0;
info->data_length= 0;
info->blength=1;
info->changed=0;
info->del_link=0;
DBUG_VOID_RETURN;
}
/*
Clear all keys.
SYNOPSIS
heap_clear_keys()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Delete all trees of all indexes and leave them empty.
RETURN
void
*/
void heap_clear_keys(HP_INFO *info)
{
hp_clear(info->s);
}
/*
Clear all keys.
SYNOPSIS
hp_clear_keys()
info A pointer to the heap storage engine HP_SHARE struct.
DESCRIPTION
Delete all trees of all indexes and leave them empty.
RETURN
void
*/
void hp_clear_keys(HP_SHARE *info)
{
uint key;
DBUG_ENTER("hp_clear_keys");
for (key=0 ; key < info->keys ; key++)
{
HP_KEYDEF *keyinfo = info->keydef + key;
if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
{
delete_tree(&keyinfo->rb_tree);
}
else
{
HP_BLOCK *block= &keyinfo->block;
if (block->levels)
VOID(hp_free_level(block,block->levels,block->root,(byte*) 0));
block->levels=0;
block->last_allocated=0;
keyinfo->hash_buckets= 0;
}
}
info->index_length=0;
DBUG_VOID_RETURN;
}
/*
Disable all indexes.
SYNOPSIS
heap_disable_indexes()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Disable and clear (remove contents of) all indexes.
RETURN
0 ok
*/
int heap_disable_indexes(HP_INFO *info)
{
HP_SHARE *share= info->s;
if (share->keys)
{
hp_clear_keys(share);
share->currently_disabled_keys= share->keys;
share->keys= 0;
}
return 0;
}
/*
Enable all indexes
SYNOPSIS
heap_enable_indexes()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Enable all indexes. The indexes might have been disabled
by heap_disable_index() before.
The function works only if both data and indexes are empty,
since the heap storage engine cannot repair the indexes.
To be sure, call handler::delete_all_rows() before.
RETURN
0 ok
HA_ERR_CRASHED data or index is non-empty.
*/
int heap_enable_indexes(HP_INFO *info)
{
int error= 0;
HP_SHARE *share= info->s;
if (share->data_length || share->index_length)
error= HA_ERR_CRASHED;
else
if (share->currently_disabled_keys)
{
share->keys= share->currently_disabled_keys;
share->currently_disabled_keys= 0;
}
return error;
}
/*
Test if indexes are disabled.
SYNOPSIS
heap_indexes_are_disabled()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Test if indexes are disabled.
RETURN
0 indexes are not disabled
1 all indexes are disabled
[2 non-unique indexes are disabled - NOT YET IMPLEMENTED]
*/
int heap_indexes_are_disabled(HP_INFO *info)
{
HP_SHARE *share= info->s;
return (! share->keys && share->currently_disabled_keys);
}
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