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/* Copyright (C) 2005 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 */
#ifdef __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include <mysql_priv.h>
#ifdef HAVE_BLACKHOLE_DB
#include "ha_blackhole.h"
const char **ha_blackhole::bas_ext() const
{
static const char *ext[]= { NullS };
return ext;
}
int ha_blackhole::open(const char *name, int mode, uint test_if_locked)
{
DBUG_ENTER("ha_blackhole::open");
thr_lock_init(&thr_lock);
thr_lock_data_init(&thr_lock,&lock,NULL);
DBUG_RETURN(0);
}
int ha_blackhole::close(void)
{
DBUG_ENTER("ha_blackhole::close");
thr_lock_delete(&thr_lock);
DBUG_RETURN(0);
}
int ha_blackhole::create(const char *name, TABLE *table_arg,
HA_CREATE_INFO *create_info)
{
DBUG_ENTER("ha_blackhole::create");
DBUG_RETURN(0);
}
const char *ha_blackhole::index_type(uint key_number)
{
DBUG_ENTER("ha_blackhole::index_type");
DBUG_RETURN((table->key_info[key_number].flags & HA_FULLTEXT) ?
"FULLTEXT" :
(table->key_info[key_number].flags & HA_SPATIAL) ?
"SPATIAL" :
(table->key_info[key_number].algorithm == HA_KEY_ALG_RTREE) ?
"RTREE" :
"BTREE");
}
int ha_blackhole::write_row(byte * buf)
{
DBUG_ENTER("ha_blackhole::write_row");
DBUG_RETURN(0);
}
int ha_blackhole::rnd_init(bool scan)
{
DBUG_ENTER("ha_blackhole::rnd_init");
DBUG_RETURN(0);
}
int ha_blackhole::rnd_next(byte *buf)
{
DBUG_ENTER("ha_blackhole::rnd_next");
DBUG_RETURN(HA_ERR_END_OF_FILE);
}
int ha_blackhole::rnd_pos(byte * buf, byte *pos)
{
DBUG_ENTER("ha_blackhole::rnd_pos");
DBUG_RETURN(0);
}
void ha_blackhole::position(const byte *record)
{
DBUG_ENTER("ha_blackhole::position");
DBUG_VOID_RETURN;
}
void ha_blackhole::info(uint flag)
{
DBUG_ENTER("ha_blackhole::info");
records= 0;
deleted= 0;
errkey= 0;
mean_rec_length= 0;
data_file_length= 0;
index_file_length= 0;
max_data_file_length= 0;
delete_length= 0;
if (flag & HA_STATUS_AUTO)
auto_increment_value= 1;
DBUG_VOID_RETURN;
}
int ha_blackhole::external_lock(THD *thd, int lock_type)
{
DBUG_ENTER("ha_blackhole::external_lock");
DBUG_RETURN(0);
}
THR_LOCK_DATA **ha_blackhole::store_lock(THD *thd,
THR_LOCK_DATA **to,
enum thr_lock_type lock_type)
{
if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK)
{
/*
Here is where we get into the guts of a row level lock.
If TL_UNLOCK is set
If we are not doing a LOCK TABLE or DISCARD/IMPORT
TABLESPACE, then allow multiple writers
*/
if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
lock_type <= TL_WRITE) && !thd->in_lock_tables
&& !thd->tablespace_op)
lock_type = TL_WRITE_ALLOW_WRITE;
/*
In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
MySQL would use the lock TL_READ_NO_INSERT on t2, and that
would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
to t2. Convert the lock to a normal read lock to allow
concurrent inserts to t2.
*/
if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables)
lock_type = TL_READ;
lock.type=lock_type;
}
*to++= &lock;
return to;
}
#endif /* HAVE_BLACKHOLE_DB */
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