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mariadb/sql/sql_class.cc
unknown d326428c41 Added Rand_log_event
2002-10-22 15:17:17 -06:00

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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 */
/*****************************************************************************
**
** This file implements classes defined in sql_class.h
** Especially the classes to handle a result from a select
**
*****************************************************************************/
#ifdef __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include "sql_acl.h"
#include <m_ctype.h>
#include <sys/stat.h>
#include <thr_alarm.h>
#ifdef __WIN__
#include <io.h>
#endif
#include <mysys_err.h>
#include <assert.h>
extern struct rand_struct sql_rand;
/*****************************************************************************
** Instansiate templates
*****************************************************************************/
#ifdef __GNUC__
/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
template class List<key_part_spec>;
template class List_iterator<key_part_spec>;
template class List<Alter_drop>;
template class List_iterator<Alter_drop>;
template class List<Alter_column>;
template class List_iterator<Alter_column>;
#endif
/****************************************************************************
** User variables
****************************************************************************/
static byte* get_var_key(user_var_entry *entry, uint *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->name.length;
return (byte*) entry->name.str;
}
static void free_var(user_var_entry *entry)
{
char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry));
if (entry->value && entry->value != pos)
my_free(entry->value, MYF(0));
my_free((char*) entry,MYF(0));
}
/****************************************************************************
** Thread specific functions
****************************************************************************/
THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
insert_id_used(0),rand_used(0),in_lock_tables(0),
global_read_lock(0),bootstrap(0)
{
host=user=priv_user=db=query=ip=0;
host_or_ip="unknown ip";
locked=killed=count_cuted_fields=some_tables_deleted=no_errors=password=
query_start_used=safe_to_cache_query=0;
pthread_mutex_lock(&LOCK_global_system_variables);
variables= global_system_variables;
pthread_mutex_unlock(&LOCK_global_system_variables);
db_length=query_length=col_access=0;
query_error=0;
next_insert_id=last_insert_id=0;
open_tables=temporary_tables=handler_tables=0;
current_tablenr=0;
handler_items=0;
tmp_table=0;
lock=locked_tables=0;
used_tables=0;
cuted_fields=sent_row_count=0L;
start_time=(time_t) 0;
current_linfo = 0;
slave_thread = 0;
slave_proxy_id = 0;
file_id = 0;
cond_count=0;
mysys_var=0;
#ifndef DBUG_OFF
dbug_sentry=THD_SENTRY_MAGIC;
#endif
net.vio=0;
net.last_error[0]=0; // If error on boot
ull=0;
system_thread=cleanup_done=0;
transaction.changed_tables = 0;
#ifdef __WIN__
real_id = 0;
#endif
#ifdef SIGNAL_WITH_VIO_CLOSE
active_vio = 0;
#endif
pthread_mutex_init(&LOCK_delete, MY_MUTEX_INIT_FAST);
/* Variables with default values */
proc_info="login";
where="field list";
server_id = ::server_id;
slave_net = 0;
log_pos = 0;
server_status= SERVER_STATUS_AUTOCOMMIT;
update_lock_default= (variables.low_priority_updates ?
TL_WRITE_LOW_PRIORITY :
TL_WRITE);
options= thd_startup_options;
sql_mode=(uint) opt_sql_mode;
open_options=ha_open_options;
session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
command=COM_CONNECT;
set_query_id=1;
db_access=NO_ACCESS;
version=refresh_version; // For boot
/* Initialize sub structures */
bzero((char*) &mem_root,sizeof(mem_root));
bzero((char*) &transaction.mem_root,sizeof(transaction.mem_root));
user_connect=(USER_CONN *)0;
hash_init(&user_vars, USER_VARS_HASH_SIZE, 0, 0,
(hash_get_key) get_var_key,
(void (*)(void*)) free_var,0);
#ifdef USING_TRANSACTIONS
bzero((char*) &transaction,sizeof(transaction));
if (opt_using_transactions)
{
if (open_cached_file(&transaction.trans_log,
mysql_tmpdir, LOG_PREFIX, binlog_cache_size,
MYF(MY_WME)))
killed=1;
transaction.trans_log.end_of_file= max_binlog_cache_size;
}
#endif
/*
We need good random number initialization for new thread
Just coping global one will not work
*/
{
pthread_mutex_lock(&LOCK_thread_count);
ulong tmp=(ulong) (rnd(&sql_rand) * 3000000);
randominit(&rand, tmp + (ulong) start_time,
tmp + (ulong) thread_id);
pthread_mutex_unlock(&LOCK_thread_count);
}
}
/* Do operations that may take a long time */
void THD::cleanup(void)
{
DBUG_ENTER("THD::cleanup");
ha_rollback(this);
if (locked_tables)
{
lock=locked_tables; locked_tables=0;
close_thread_tables(this);
}
if (handler_tables)
{
open_tables=handler_tables; handler_tables=0;
close_thread_tables(this);
}
close_temporary_tables(this);
#ifdef USING_TRANSACTIONS
if (opt_using_transactions)
{
close_cached_file(&transaction.trans_log);
ha_close_connection(this);
}
#endif
cleanup_done=1;
DBUG_VOID_RETURN;
}
THD::~THD()
{
THD_CHECK_SENTRY(this);
DBUG_ENTER("~THD()");
/* Ensure that no one is using THD */
pthread_mutex_lock(&LOCK_delete);
pthread_mutex_unlock(&LOCK_delete);
/* Close connection */
if (net.vio)
{
vio_delete(net.vio);
net_end(&net);
}
if (!cleanup_done)
cleanup();
if (global_read_lock)
unlock_global_read_lock(this);
if (ull)
{
pthread_mutex_lock(&LOCK_user_locks);
item_user_lock_release(ull);
pthread_mutex_unlock(&LOCK_user_locks);
}
hash_free(&user_vars);
DBUG_PRINT("info", ("freeing host"));
if (host != localhost) // If not pointer to constant
safeFree(host);
if (user != delayed_user)
safeFree(user);
safeFree(db);
safeFree(ip);
free_root(&mem_root,MYF(0));
free_root(&transaction.mem_root,MYF(0));
mysys_var=0; // Safety (shouldn't be needed)
pthread_mutex_destroy(&LOCK_delete);
#ifndef DBUG_OFF
dbug_sentry = THD_SENTRY_GONE;
#endif
DBUG_VOID_RETURN;
}
void THD::awake(bool prepare_to_die)
{
THD_CHECK_SENTRY(this);
safe_mutex_assert_owner(&LOCK_delete);
if (prepare_to_die)
killed = 1;
thr_alarm_kill(real_id);
#ifdef SIGNAL_WITH_VIO_CLOSE
close_active_vio();
#endif
if (mysys_var)
{
pthread_mutex_lock(&mysys_var->mutex);
if (!system_thread) // Don't abort locks
mysys_var->abort=1;
/*
This broadcast could be up in the air if the victim thread
exits the cond in the time between read and broadcast, but that is
ok since all we want to do is to make the victim thread get out
of waiting on current_cond.
*/
if (mysys_var->current_cond)
{
pthread_mutex_lock(mysys_var->current_mutex);
pthread_cond_broadcast(mysys_var->current_cond);
pthread_mutex_unlock(mysys_var->current_mutex);
}
pthread_mutex_unlock(&mysys_var->mutex);
}
}
/*
Remember the location of thread info, the structure needed for
sql_alloc() and the structure for the net buffer
*/
bool THD::store_globals()
{
if (my_pthread_setspecific_ptr(THR_THD, this) ||
my_pthread_setspecific_ptr(THR_MALLOC, &mem_root) ||
my_pthread_setspecific_ptr(THR_NET, &net))
return 1;
mysys_var=my_thread_var;
dbug_thread_id=my_thread_id();
return 0;
}
/* routings to adding tables to list of changed in transaction tables */
inline static void list_include(CHANGED_TABLE_LIST** prev,
CHANGED_TABLE_LIST* curr,
CHANGED_TABLE_LIST* new_table)
{
if (new_table)
{
*prev = new_table;
(*prev)->next = curr;
}
}
/* add table to list of changed in transaction tables */
void THD::add_changed_table(TABLE *table)
{
DBUG_ENTER("THD::add_changed_table(table)");
DBUG_ASSERT((options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) &&
table->file->has_transactions());
add_changed_table(table->table_cache_key, table->key_length);
DBUG_VOID_RETURN;
}
void THD::add_changed_table(const char *key, long key_length)
{
DBUG_ENTER("THD::add_changed_table(key)");
CHANGED_TABLE_LIST** prev = &transaction.changed_tables;
CHANGED_TABLE_LIST* curr = transaction.changed_tables;
for (; curr; prev = &(curr->next), curr = curr->next)
{
int cmp = (long)curr->key_length - (long)key_length;
if (cmp < 0)
{
list_include(prev, curr, changed_table_dup(key, key_length));
DBUG_PRINT("info",
("key_length %u %u", key_length, (*prev)->key_length));
DBUG_VOID_RETURN;
}
else if (cmp == 0)
{
cmp = memcmp(curr->key, key, curr->key_length);
if (cmp < 0)
{
list_include(prev, curr, changed_table_dup(key, key_length));
DBUG_PRINT("info",
("key_length %u %u", key_length,
(*prev)->key_length));
DBUG_VOID_RETURN;
}
else if (cmp == 0)
{
DBUG_PRINT("info", ("already in list"));
DBUG_VOID_RETURN;
}
}
}
*prev = changed_table_dup(key, key_length);
DBUG_PRINT("info", ("key_length %u %u", key_length,
(*prev)->key_length));
DBUG_VOID_RETURN;
}
CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
{
CHANGED_TABLE_LIST* new_table =
(CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+
key_length + 1);
if (!new_table)
{
my_error(EE_OUTOFMEMORY, MYF(ME_BELL),
ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1);
killed= 1;
return 0;
}
new_table->key = (char *) (((byte*)new_table)+
ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST)));
new_table->next = 0;
new_table->key_length = key_length;
::memcpy(new_table->key, key, key_length);
return new_table;
}
#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
{
safe_mutex_assert_owner(&LOCK_delete);
if (active_vio)
{
vio_close(active_vio);
active_vio = 0;
}
}
#endif
/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/
select_result::select_result()
{
thd=current_thd;
}
static String default_line_term("\n"),default_escaped("\\"),
default_field_term("\t");
sql_exchange::sql_exchange(char *name,bool flag)
:file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
field_term= &default_field_term;
enclosed= line_start= &empty_string;
line_term= &default_line_term;
escaped= &default_escaped;
}
bool select_send::send_fields(List<Item> &list,uint flag)
{
return ::send_fields(thd,list,flag);
}
/* Send data to client. Returns 0 if ok */
bool select_send::send_data(List<Item> &items)
{
List_iterator_fast<Item> li(items);
String *packet= &thd->packet;
DBUG_ENTER("send_data");
if (thd->offset_limit)
{ // using limit offset,count
thd->offset_limit--;
DBUG_RETURN(0);
}
packet->length(0); // Reset packet
Item *item;
while ((item=li++))
{
if (item->send(thd, packet))
{
packet->free(); // Free used
my_error(ER_OUT_OF_RESOURCES,MYF(0));
DBUG_RETURN(1);
}
}
thd->sent_row_count++;
bool error=my_net_write(&thd->net,(char*) packet->ptr(),packet->length());
DBUG_RETURN(error);
}
bool select_send::send_eof()
{
/* Unlock tables before sending packet to gain some speed */
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock); thd->lock=0;
}
::send_eof(&thd->net);
return 0;
}
/***************************************************************************
** Export of select to textfile
***************************************************************************/
select_export::~select_export()
{
if (file >= 0)
{ // This only happens in case of error
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
file= -1;
}
thd->sent_row_count=row_count;
}
int
select_export::prepare(List<Item> &list)
{
char path[FN_REFLEN];
uint option=4;
bool blob_flag=0;
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
option|=1; // Force use of db directory
#endif
if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
strmake(path,exchange->file_name,FN_REFLEN-1);
(void) fn_format(path,exchange->file_name, thd->db ? thd->db : "", "",
option);
if (!access(path,F_OK))
{
my_error(ER_FILE_EXISTS_ERROR,MYF(0),exchange->file_name);
return 1;
}
/* Create the file world readable */
if ((file=my_create(path, 0666, O_WRONLY, MYF(MY_WME))) < 0)
return 1;
#ifdef HAVE_FCHMOD
(void) fchmod(file,0666); // Because of umask()
#else
(void) chmod(path,0666);
#endif
if (init_io_cache(&cache,file,0L,WRITE_CACHE,0L,1,MYF(MY_WME)))
{
my_close(file,MYF(0));
file= -1;
return 1;
}
/* Check if there is any blobs in data */
{
List_iterator_fast<Item> li(list);
Item *item;
while ((item=li++))
{
if (item->max_length >= MAX_BLOB_WIDTH)
{
blob_flag=1;
break;
}
}
}
field_term_length=exchange->field_term->length();
if (!exchange->line_term->length())
exchange->line_term=exchange->field_term; // Use this if it exists
field_sep_char= (exchange->enclosed->length() ? (*exchange->enclosed)[0] :
field_term_length ? (*exchange->field_term)[0] : INT_MAX);
escape_char= (exchange->escaped->length() ? (*exchange->escaped)[0] : -1);
line_sep_char= (exchange->line_term->length() ?
(*exchange->line_term)[0] : INT_MAX);
if (!field_term_length)
exchange->opt_enclosed=0;
if (!exchange->enclosed->length())
exchange->opt_enclosed=1; // A little quicker loop
fixed_row_size= (!field_term_length && !exchange->enclosed->length() &&
!blob_flag);
return 0;
}
bool select_export::send_data(List<Item> &items)
{
DBUG_ENTER("send_data");
char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
bool space_inited=0;
String tmp(buff,sizeof(buff)),*res;
tmp.length(0);
if (thd->offset_limit)
{ // using limit offset,count
thd->offset_limit--;
DBUG_RETURN(0);
}
row_count++;
Item *item;
char *buff_ptr=buff;
uint used_length=0,items_left=items.elements;
List_iterator_fast<Item> li(items);
if (my_b_write(&cache,(byte*) exchange->line_start->ptr(),
exchange->line_start->length()))
goto err;
while ((item=li++))
{
Item_result result_type=item->result_type();
res=item->str_result(&tmp);
if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT))
{
if (my_b_write(&cache,(byte*) exchange->enclosed->ptr(),
exchange->enclosed->length()))
goto err;
}
if (!res)
{ // NULL
if (!fixed_row_size)
{
if (escape_char != -1) // Use \N syntax
{
null_buff[0]=escape_char;
null_buff[1]='N';
if (my_b_write(&cache,(byte*) null_buff,2))
goto err;
}
else if (my_b_write(&cache,(byte*) "NULL",4))
goto err;
}
else
{
used_length=0; // Fill with space
}
}
else
{
if (fixed_row_size)
used_length=min(res->length(),item->max_length);
else
used_length=res->length();
if (result_type == STRING_RESULT && escape_char != -1)
{
char *pos,*start,*end;
for (start=pos=(char*) res->ptr(),end=pos+used_length ;
pos != end ;
pos++)
{
#ifdef USE_MB
if (use_mb(default_charset_info))
{
int l;
if ((l=my_ismbchar(default_charset_info, pos, end)))
{
pos += l-1;
continue;
}
}
#endif
if ((int) *pos == escape_char || (int) *pos == field_sep_char ||
(int) *pos == line_sep_char || !*pos)
{
char tmp_buff[2];
tmp_buff[0]= escape_char;
tmp_buff[1]= *pos ? *pos : '0';
if (my_b_write(&cache,(byte*) start,(uint) (pos-start)) ||
my_b_write(&cache,(byte*) tmp_buff,2))
goto err;
start=pos+1;
}
}
if (my_b_write(&cache,(byte*) start,(uint) (pos-start)))
goto err;
}
else if (my_b_write(&cache,(byte*) res->ptr(),used_length))
goto err;
}
if (fixed_row_size)
{ // Fill with space
if (item->max_length > used_length)
{
/* QQ: Fix by adding a my_b_fill() function */
if (!space_inited)
{
space_inited=1;
bfill(space,sizeof(space),' ');
}
uint length=item->max_length-used_length;
for (; length > sizeof(space) ; length-=sizeof(space))
{
if (my_b_write(&cache,(byte*) space,sizeof(space)))
goto err;
}
if (my_b_write(&cache,(byte*) space,length))
goto err;
}
}
buff_ptr=buff; // Place separators here
if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT))
{
memcpy(buff_ptr,exchange->enclosed->ptr(),exchange->enclosed->length());
buff_ptr+=exchange->enclosed->length();
}
if (--items_left)
{
memcpy(buff_ptr,exchange->field_term->ptr(),field_term_length);
buff_ptr+=field_term_length;
}
if (my_b_write(&cache,(byte*) buff,(uint) (buff_ptr-buff)))
goto err;
}
if (my_b_write(&cache,(byte*) exchange->line_term->ptr(),
exchange->line_term->length()))
goto err;
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
}
void select_export::send_error(uint errcode,const char *err)
{
::send_error(&thd->net,errcode,err);
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
file= -1;
}
bool select_export::send_eof()
{
int error=test(end_io_cache(&cache));
if (my_close(file,MYF(MY_WME)))
error=1;
if (error)
::send_error(&thd->net);
else
::send_ok(&thd->net,row_count);
file= -1;
return error;
}
/***************************************************************************
** Dump of select to a binary file
***************************************************************************/
select_dump::~select_dump()
{
if (file >= 0)
{ // This only happens in case of error
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
file= -1;
}
}
int
select_dump::prepare(List<Item> &list __attribute__((unused)))
{
uint option=4;
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
option|=1; // Force use of db directory
#endif
(void) fn_format(path,exchange->file_name, thd->db ? thd->db : "", "",
option);
if (!access(path,F_OK))
{
my_error(ER_FILE_EXISTS_ERROR,MYF(0),exchange->file_name);
return 1;
}
/* Create the file world readable */
if ((file=my_create(path, 0666, O_WRONLY, MYF(MY_WME))) < 0)
return 1;
#ifdef HAVE_FCHMOD
(void) fchmod(file,0666); // Because of umask()
#else
(void) chmod(path,0666);
#endif
if (init_io_cache(&cache,file,0L,WRITE_CACHE,0L,1,MYF(MY_WME)))
{
my_close(file,MYF(0));
my_delete(path,MYF(0));
file= -1;
return 1;
}
return 0;
}
bool select_dump::send_data(List<Item> &items)
{
List_iterator_fast<Item> li(items);
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff)),*res;
tmp.length(0);
Item *item;
DBUG_ENTER("send_data");
if (thd->offset_limit)
{ // using limit offset,count
thd->offset_limit--;
DBUG_RETURN(0);
}
if (row_count++ > 1)
{
my_error(ER_TOO_MANY_ROWS,MYF(0));
goto err;
}
while ((item=li++))
{
res=item->str_result(&tmp);
if (!res) // If NULL
{
if (my_b_write(&cache,(byte*) "",1))
goto err;
}
else if (my_b_write(&cache,(byte*) res->ptr(),res->length()))
{
my_error(ER_ERROR_ON_WRITE,MYF(0), path, my_errno);
goto err;
}
}
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
}
void select_dump::send_error(uint errcode,const char *err)
{
::send_error(&thd->net,errcode,err);
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
(void) my_delete(path,MYF(0)); // Delete file on error
file= -1;
}
bool select_dump::send_eof()
{
int error=test(end_io_cache(&cache));
if (my_close(file,MYF(MY_WME)))
error=1;
if (error)
::send_error(&thd->net);
else
::send_ok(&thd->net,row_count);
file= -1;
return error;
}
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