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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 */
/* HANDLER ... commands - direct access to ISAM */
#include "mysql_priv.h"
#include "sql_select.h"
static TABLE *find_table_by_name(THD *thd, char *db, char *table_name);
int mysql_ha_open(THD *thd, TABLE_LIST *tables)
{
int err=open_tables(thd,tables);
if (!err)
{
thd->manual_open=1;
send_ok(&thd->net);
}
}
int mysql_ha_close(THD *thd, TABLE_LIST *tables)
{
send_ok(&thd->net);
return 0;
}
static enum enum_ha_read_modes rkey_to_rnext[]=
{ RNEXT, RNEXT, RPREV, RNEXT, RPREV, RNEXT, RPREV };
int mysql_ha_read(THD *thd, TABLE_LIST *tables,
enum enum_ha_read_modes mode, char *keyname, List<Item> *key_expr,
enum ha_rkey_function ha_rkey_mode,
ha_rows select_limit,ha_rows offset_limit)
{
int err;
TABLE *table=find_table_by_name(thd, tables->db, tables->name);
if (!table)
{
my_printf_error(ER_UNKNOWN_TABLE,ER(ER_UNKNOWN_TABLE),MYF(0),
tables->name,"HANDLER");
// send_error(&thd->net,ER_UNKNOWN_TABLE);
// send_ok(&thd->net);
return -1;
}
tables->table=table;
int keyno=find_type(keyname, &table->keynames, 1+2)-1;
if (keyno<0)
{
my_printf_error(ER_KEY_DOES_NOT_EXITS,ER(ER_KEY_DOES_NOT_EXITS),MYF(0),
keyname,tables->name);
return -1;
}
List<Item> list;
list.push_front(new Item_field(NULL,NULL,"*"));
List_iterator<Item> it(list);
it++;
insert_fields(thd,tables,tables->name,&it);
table->file->index_init(keyno);
if (select_limit == thd->default_select_limit) select_limit=1;
select_limit+=offset_limit;
for (uint num_rows=0; num_rows < select_limit; num_rows++)
{
switch(mode)
{
case RFIRST:
err=table->file->index_first(table->record[0]);
mode=RNEXT;
break;
case RLAST:
err=table->file->index_last(table->record[0]);
mode=RPREV;
break;
case RNEXT:
err=table->file->index_next(table->record[0]);
break;
case RPREV:
err=table->file->index_prev(table->record[0]);
break;
case RKEY:
{
KEY *keyinfo=table->key_info+keyno;
uint key_len=0, i;
byte *key, *buf;
if (key_expr->elements > keyinfo->key_parts)
{
my_printf_error(ER_TOO_MANY_KEY_PARTS,ER(ER_TOO_MANY_KEY_PARTS),
MYF(0),keyinfo->key_parts);
return -1;
}
for (i=0; i < key_expr->elements; i++)
key_len+=keyinfo->key_part[i].store_length;
if (!(key=sql_calloc(ALIGN_SIZE(key_len))))
{
send_error(&thd->net,ER_OUTOFMEMORY);
return -1;
}
List_iterator<Item> it_ke(*key_expr);
for (i=0, buf=key; i < key_expr->elements; i++)
{
uint maybe_null= test(keyinfo->key_part[i].null_bit);
store_key_item ski=store_key_item(keyinfo->key_part[i].field,
(char*)buf+maybe_null,maybe_null ? (char*) buf : 0,
keyinfo->key_part[i].length, it_ke++);
ski.copy();
buf+=keyinfo->key_part[i].store_length;
}
err=table->file->index_read(table->record[0],
key,key_len,ha_rkey_mode);
mode=rkey_to_rnext[(int)ha_rkey_mode];
break;
}
default:
send_error(&thd->net,ER_ILLEGAL_HA);
return -1;
}
if (err && err != HA_ERR_KEY_NOT_FOUND && err != HA_ERR_END_OF_FILE)
{
sql_print_error("mysql_ha_read: Got error %d when reading table",
err);
table->file->print_error(err,MYF(0));
return -1;
}
if (num_rows>=offset_limit)
{
if (num_rows==offset_limit) send_fields(thd,list,1);
if (!err)
{
String *packet = &thd->packet;
Item *item;
packet->length(0);
it.rewind();
while ((item=it++))
{
if (item->send(packet))
{
packet->free(); // Free used
my_error(ER_OUT_OF_RESOURCES,MYF(0));
return -1;
}
}
my_net_write(&thd->net, (char*)packet->ptr(), packet->length());
}
}
}
send_eof(&thd->net);
return 0;
}
/**************************************************************************
2Monty: It could easily happen, that the following service functions are
already defined somewhere in the code, but I failed to find them.
If this is the case, just say a word and I'll use old functions here.
**************************************************************************/
/* Note: this function differs from find_locked_table() because we're looking
here for alias, not real table name
*/
static TABLE *find_table_by_name(THD *thd, char *db, char *table_name)
{
int dblen;
if (!db || ! *db) db=thd->db;
if (!db || ! *db) db="";
dblen=strlen(db);
for (TABLE *table=thd->open_tables; table ; table=table->next)
{
if (!memcmp(table->table_cache_key, db, dblen) &&
!my_strcasecmp(table->table_name,table_name))
return table;
}
return(0);
}
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