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serg@serg.mysql.com
2001-04-13 16:18:44 +02:00
parent a981cfbdcb
commit ca0ba8e0ab
9 changed files with 243 additions and 134 deletions
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231
sql/sql_handler.cc
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@ -17,23 +17,53 @@
/* HANDLER ... commands - direct access to ISAM */
#include <assert.h>
#include "mysql_priv.h"
#include "sql_select.h"
/* TODO:
HANDLER blabla OPEN [ AS foobar ] [ (column-list) ]
the most natural (easiest, fastest) way to do it is to
compute List<Item> field_list not in mysql_ha_read
but in mysql_ha_open, and then store it in TABLE structure.
The problem here is that mysql_parse calls free_item to free all the
items allocated at the end of every query. The workaround would to
keep two item lists per THD - normal free_list and handler_items.
The second is to be freeed only on thread end. mysql_ha_open should
then do { handler_items=concat(handler_items, free_list); free_list=0; }
But !!! do_cammand calls free_root at the end of every query and frees up
all the sql_alloc'ed memory. It's harder to work around...
*/
#define HANDLER_TABLES_HACK(thd) { \
TABLE *tmp=thd->open_tables; \
thd->open_tables=thd->handler_tables; \
thd->handler_tables=tmp; }
static TABLE *find_table_by_name(THD *thd, char *db, char *table_name);
int mysql_ha_open(THD *thd, TABLE_LIST *tables)
{
HANDLER_TABLES_HACK(thd);
int err=open_tables(thd,tables);
if (!err)
{
thd->manual_open=1;
send_ok(&thd->net);
}
HANDLER_TABLES_HACK(thd);
if (err)
return -1;
send_ok(&thd->net);
return 0;
}
int mysql_ha_close(THD *thd, TABLE_LIST *tables)
{
/* Perhaps, we should close table here.
But it's not easy - *tables is a single-linked list, designed
to be closed at all once.
So, why bother ? All the tables will be closed at thread exit.
*/
send_ok(&thd->net);
return 0;
}
@ -43,27 +73,30 @@ static enum enum_ha_read_modes rkey_to_rnext[]=
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,
enum ha_rkey_function ha_rkey_mode, Item *cond,
ha_rows select_limit,ha_rows offset_limit)
{
int err;
int err, keyno=-1;
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);
tables->name,"HANDLER");
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);
if (cond && cond->fix_fields(thd,tables))
return -1;
if (keyname)
{
if ((keyno=find_type(keyname, &table->keynames, 1+2)-1)<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;
@ -72,99 +105,121 @@ int mysql_ha_read(THD *thd, TABLE_LIST *tables,
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++)
table->file->index_init(keyno);
select_limit+=offset_limit;
send_fields(thd,list,1);
MYSQL_LOCK *lock=mysql_lock_tables(thd,&tables->table,1);
for (uint num_rows=0; num_rows < select_limit; )
{
switch(mode)
{
case RFIRST:
err=table->file->index_first(table->record[0]);
mode=RNEXT;
break;
err=keyname ?
table->file->index_first(table->record[0]) :
table->file->rnd_init(1) ||
table->file->rnd_next(table->record[0]);
mode=RNEXT;
break;
case RLAST:
err=table->file->index_last(table->record[0]);
mode=RPREV;
break;
dbug_assert(keyname != 0);
err=table->file->index_last(table->record[0]);
mode=RPREV;
break;
case RNEXT:
err=table->file->index_next(table->record[0]);
break;
err=keyname ?
table->file->index_next(table->record[0]) :
table->file->rnd_next(table->record[0]);
break;
case RPREV:
err=table->file->index_prev(table->record[0]);
break;
dbug_assert(keyname != 0);
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;
}
{
dbug_assert(keyname != 0);
KEY *keyinfo=table->key_info+keyno;
KEY_PART_INFO *key_part=keyinfo->key_part;
uint key_len;
byte *key;
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);
goto err;
}
List_iterator<Item> it_ke(*key_expr);
Item *item;
for (key_len=0 ; (item=it_ke++) ; key_part++)
{
item->save_in_field(key_part->field);
key_len+=key_part->store_length;
}
if (!(key=sql_calloc(ALIGN_SIZE(key_len))))
{
send_error(&thd->net,ER_OUTOFMEMORY);
goto err;
}
key_copy(key, table, keyno, key_len);
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;
send_error(&thd->net,ER_ILLEGAL_HA);
goto err;
}
if (err && err != HA_ERR_KEY_NOT_FOUND && err != HA_ERR_END_OF_FILE)
if (err)
{
sql_print_error("mysql_ha_read: Got error %d when reading table",
err);
table->file->print_error(err,MYF(0));
return -1;
if (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));
goto err;
}
goto ok;
}
if (cond)
{
err=err;
if(!cond->val_int())
continue;
}
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());
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));
goto err;
}
}
my_net_write(&thd->net, (char*)packet->ptr(), packet->length());
}
}
num_rows++;
}
ok:
mysql_unlock_tables(thd,lock);
send_eof(&thd->net);
return 0;
err:
mysql_unlock_tables(thd,lock);
return -1;
}
/**************************************************************************
@ -184,10 +239,10 @@ static TABLE *find_table_by_name(THD *thd, char *db, char *table_name)
if (!db || ! *db) db="";
dblen=strlen(db);
for (TABLE *table=thd->open_tables; table ; table=table->next)
for (TABLE *table=thd->handler_tables; table ; table=table->next)
{
if (!memcmp(table->table_cache_key, db, dblen) &&
!my_strcasecmp(table->table_name,table_name))
!my_strcasecmp(table->table_name,table_name))
return table;
}
return(0);