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mariadb/sql/protocol.cc
unknown 4b954cc094 A patch for BUG#32148: killing a query may be ineffective. 
The problem was that THD::killed was reset after a command was
read from the socket, but before it was actually handled. That lead
to a race: if another KILL statement was issued for this connection
in the middle of reading from the socket and processing a command,
THD::killed state would be cleaned.

The fix is to move this cleanup into net_send_error() function.

A sample test case exists in binlog_killed.test:
  - connection 1: start a new transaction on table t1;
  - connection 2: send query to the server (w/o waiting for the
    result) to update data in table t1 -- this query will be blocked
    since there is unfinished transaction;
  - connection 1: kill query in connection 2 and finish the transaction;
  - connection 2: get result of the previous query -- it should be
    the "query-killed" error.

This test however contains race condition, which can not be fixed
with the current protocol: there is no way to guarantee, that the
server will receive and start processing the query in connection 2
(which is intended to get blocked) before the KILL command (sent in
the connection 1) will arrive. In other words, there is no way to
ensure that the following sequence will not happen:

  - connection 1: start a new transaction on table t1;
  - connection 1: kill query in connection 2 and finish the transaction;
  - connection 2: send query to the server (w/o waiting for the
    result) to update data in table t1 -- this query will be blocked
    since there is unfinished transaction;
  - connection 2: get result of the previous query -- the query will
    succeed.

So, there is no test case for this bug, since it's impossible
to write a reliable test case under the current circumstances.


sql/protocol.cc:
  Move thd->killed cleanup from dispatch_command() to net_send_error().
sql/sql_parse.cc:
  Move thd->killed cleanup from dispatch_command() to net_send_error().
2007-11-30 16:12:20 +03:00

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/* Copyright (C) 2000-2003 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; 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 */
/*
Low level functions for storing data to be send to the MySQL client
The actual communction is handled by the net_xxx functions in net_serv.cc
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include "sp_rcontext.h"
#include <stdarg.h>
static const unsigned int PACKET_BUFFER_EXTRA_ALLOC= 1024;
void net_send_error_packet(THD *thd, uint sql_errno, const char *err);
#ifndef EMBEDDED_LIBRARY
static void write_eof_packet(THD *thd, NET *net);
#endif
#ifndef EMBEDDED_LIBRARY
bool Protocol::net_store_data(const uchar *from, size_t length)
#else
bool Protocol_binary::net_store_data(const uchar *from, size_t length)
#endif
{
ulong packet_length=packet->length();
/*
The +9 comes from that strings of length longer than 16M require
9 bytes to be stored (see net_store_length).
*/
if (packet_length+9+length > packet->alloced_length() &&
packet->realloc(packet_length+9+length))
return 1;
uchar *to= net_store_length((uchar*) packet->ptr()+packet_length, length);
memcpy(to,from,length);
packet->length((uint) (to+length-(uchar*) packet->ptr()));
return 0;
}
/*
Send a error string to client
Design note:
net_send_error is a low-level functions
that shall be used only when a new connection is being
established or at server startup.
For SIGNAL/RESIGNAL and GET DIAGNOSTICS functionality it's
critical that every error that can be intercepted is issued in one
place only, my_message_sql.
*/
void net_send_error(THD *thd, uint sql_errno, const char *err)
{
NET *net= &thd->net;
bool generate_warning= thd->killed != THD::KILL_CONNECTION;
DBUG_ENTER("net_send_error");
DBUG_PRINT("enter",("sql_errno: %d err: %s", sql_errno,
err ? err : net->last_error[0] ?
net->last_error : "NULL"));
DBUG_ASSERT(!thd->spcont);
if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
{
thd->killed= THD::NOT_KILLED;
thd->mysys_var->abort= 0;
}
if (net && net->no_send_error)
{
thd->clear_error();
thd->is_fatal_error= 0; // Error message is given
DBUG_PRINT("info", ("sending error messages prohibited"));
DBUG_VOID_RETURN;
}
thd->is_slave_error= 1; // needed to catch query errors during replication
if (!err)
{
if (sql_errno)
err=ER(sql_errno);
else
{
if ((err=net->last_error)[0])
{
sql_errno=net->last_errno;
generate_warning= 0; // This warning has already been given
}
else
{
sql_errno=ER_UNKNOWN_ERROR;
err=ER(sql_errno); /* purecov: inspected */
}
}
}
if (generate_warning)
{
/* Error that we have not got with my_error() */
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, sql_errno, err);
}
net_send_error_packet(thd, sql_errno, err);
thd->is_fatal_error= 0; // Error message is given
thd->net.report_error= 0;
/* Abort multi-result sets */
thd->server_status&= ~SERVER_MORE_RESULTS_EXISTS;
DBUG_VOID_RETURN;
}
/*
Return ok to the client.
SYNOPSIS
send_ok()
thd Thread handler
affected_rows Number of rows changed by statement
id Auto_increment id for first row (if used)
message Message to send to the client (Used by mysql_status)
DESCRIPTION
The ok packet has the following structure
0 Marker (1 byte)
affected_rows Stored in 1-9 bytes
id Stored in 1-9 bytes
server_status Copy of thd->server_status; Can be used by client
to check if we are inside an transaction
New in 4.0 protocol
warning_count Stored in 2 bytes; New in 4.1 protocol
message Stored as packed length (1-9 bytes) + message
Is not stored if no message
If net->no_send_ok return without sending packet
*/
#ifndef EMBEDDED_LIBRARY
void
send_ok(THD *thd, ha_rows affected_rows, ulonglong id, const char *message)
{
NET *net= &thd->net;
uchar buff[MYSQL_ERRMSG_SIZE+10],*pos;
DBUG_ENTER("send_ok");
if (net->no_send_ok || !net->vio) // hack for re-parsing queries
{
DBUG_PRINT("info", ("no send ok: %s, vio present: %s",
(net->no_send_ok ? "YES" : "NO"),
(net->vio ? "YES" : "NO")));
DBUG_VOID_RETURN;
}
buff[0]=0; // No fields
pos=net_store_length(buff+1,affected_rows);
pos=net_store_length(pos, id);
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
DBUG_PRINT("info",
("affected_rows: %lu id: %lu status: %u warning_count: %u",
(ulong) affected_rows,
(ulong) id,
(uint) (thd->server_status & 0xffff),
(uint) thd->total_warn_count));
int2store(pos,thd->server_status);
pos+=2;
/* We can only return up to 65535 warnings in two bytes */
uint tmp= min(thd->total_warn_count, 65535);
int2store(pos, tmp);
pos+= 2;
}
else if (net->return_status) // For 4.0 protocol
{
int2store(pos,thd->server_status);
pos+=2;
}
if (message)
pos= net_store_data(pos, (uchar*) message, strlen(message));
VOID(my_net_write(net, buff, (size_t) (pos-buff)));
VOID(net_flush(net));
/* We can't anymore send an error to the client */
thd->net.report_error= 0;
thd->net.no_send_error= 1;
DBUG_PRINT("info", ("OK sent, so no more error sending allowed"));
DBUG_VOID_RETURN;
}
static uchar eof_buff[1]= { (uchar) 254 }; /* Marker for end of fields */
/*
Send eof (= end of result set) to the client
SYNOPSIS
send_eof()
thd Thread handler
no_flush Set to 1 if there will be more data to the client,
like in send_fields().
DESCRIPTION
The eof packet has the following structure
254 Marker (1 byte)
warning_count Stored in 2 bytes; New in 4.1 protocol
status_flag Stored in 2 bytes;
For flags like SERVER_MORE_RESULTS_EXISTS
Note that the warning count will not be sent if 'no_flush' is set as
we don't want to report the warning count until all data is sent to the
client.
*/
void
send_eof(THD *thd)
{
NET *net= &thd->net;
DBUG_ENTER("send_eof");
if (net->vio != 0)
{
write_eof_packet(thd, net);
VOID(net_flush(net));
thd->net.no_send_error= 1;
DBUG_PRINT("info", ("EOF sent, so no more error sending allowed"));
}
DBUG_VOID_RETURN;
}
/*
Format EOF packet according to the current protocol and
write it to the network output buffer.
*/
static void write_eof_packet(THD *thd, NET *net)
{
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
uchar buff[5];
/*
Don't send warn count during SP execution, as the warn_list
is cleared between substatements, and mysqltest gets confused
*/
uint tmp= (thd->spcont ? 0 : min(thd->total_warn_count, 65535));
buff[0]= 254;
int2store(buff+1, tmp);
/*
The following test should never be true, but it's better to do it
because if 'is_fatal_error' is set the server is not going to execute
other queries (see the if test in dispatch_command / COM_QUERY)
*/
if (thd->is_fatal_error)
thd->server_status&= ~SERVER_MORE_RESULTS_EXISTS;
int2store(buff+3, thd->server_status);
VOID(my_net_write(net, buff, 5));
}
else
VOID(my_net_write(net, eof_buff, 1));
}
/*
Please client to send scrambled_password in old format.
SYNOPSYS
send_old_password_request()
thd thread handle
RETURN VALUE
0 ok
!0 error
*/
bool send_old_password_request(THD *thd)
{
NET *net= &thd->net;
return my_net_write(net, eof_buff, 1) || net_flush(net);
}
void net_send_error_packet(THD *thd, uint sql_errno, const char *err)
{
NET *net= &thd->net;
uint length;
uchar buff[MYSQL_ERRMSG_SIZE+2], *pos;
DBUG_ENTER("send_error_packet");
if (net->vio == 0)
{
if (thd->bootstrap)
{
/* In bootstrap it's ok to print on stderr */
fprintf(stderr,"ERROR: %d %s\n",sql_errno,err);
}
DBUG_VOID_RETURN;
}
if (net->return_errno)
{ // new client code; Add errno before message
int2store(buff,sql_errno);
pos= buff+2;
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
/* The first # is to make the protocol backward compatible */
buff[2]= '#';
pos= (uchar*) strmov((char*) buff+3, mysql_errno_to_sqlstate(sql_errno));
}
length= (uint) (strmake((char*) pos, err, MYSQL_ERRMSG_SIZE-1) -
(char*) buff);
err= (char*) buff;
}
else
{
length=(uint) strlen(err);
set_if_smaller(length,MYSQL_ERRMSG_SIZE-1);
}
VOID(net_write_command(net,(uchar) 255, (uchar*) "", 0, (uchar*) err,
length));
DBUG_VOID_RETURN;
}
#endif /* EMBEDDED_LIBRARY */
/*
Faster net_store_length when we know that length is less than 65536.
We keep a separate version for that range because it's widely used in
libmysql.
uint is used as agrument type because of MySQL type conventions:
uint for 0..65536
ulong for 0..4294967296
ulonglong for bigger numbers.
*/
static uchar *net_store_length_fast(uchar *packet, uint length)
{
if (length < 251)
{
*packet=(uchar) length;
return packet+1;
}
*packet++=252;
int2store(packet,(uint) length);
return packet+2;
}
/****************************************************************************
Functions used by the protocol functions (like send_ok) to store strings
and numbers in the header result packet.
****************************************************************************/
/* The following will only be used for short strings < 65K */
uchar *net_store_data(uchar *to, const uchar *from, size_t length)
{
to=net_store_length_fast(to,length);
memcpy(to,from,length);
return to+length;
}
uchar *net_store_data(uchar *to,int32 from)
{
char buff[20];
uint length=(uint) (int10_to_str(from,buff,10)-buff);
to=net_store_length_fast(to,length);
memcpy(to,buff,length);
return to+length;
}
uchar *net_store_data(uchar *to,longlong from)
{
char buff[22];
uint length=(uint) (longlong10_to_str(from,buff,10)-buff);
to=net_store_length_fast(to,length);
memcpy(to,buff,length);
return to+length;
}
/*****************************************************************************
Default Protocol functions
*****************************************************************************/
void Protocol::init(THD *thd_arg)
{
thd=thd_arg;
packet= &thd->packet;
convert= &thd->convert_buffer;
#ifndef DBUG_OFF
field_types= 0;
#endif
}
bool Protocol::flush()
{
#ifndef EMBEDDED_LIBRARY
return net_flush(&thd->net);
#else
return 0;
#endif
}
/*
Send name and type of result to client.
SYNOPSIS
send_fields()
THD Thread data object
list List of items to send to client
flag Bit mask with the following functions:
1 send number of rows
2 send default values
4 don't write eof packet
DESCRIPTION
Sum fields has table name empty and field_name.
RETURN VALUES
0 ok
1 Error (Note that in this case the error is not sent to the client)
*/
#ifndef EMBEDDED_LIBRARY
bool Protocol::send_fields(List<Item> *list, uint flags)
{
List_iterator_fast<Item> it(*list);
Item *item;
uchar buff[80];
String tmp((char*) buff,sizeof(buff),&my_charset_bin);
Protocol_text prot(thd);
String *local_packet= prot.storage_packet();
CHARSET_INFO *thd_charset= thd->variables.character_set_results;
DBUG_ENTER("send_fields");
if (flags & SEND_NUM_ROWS)
{ // Packet with number of elements
uchar *pos= net_store_length(buff, list->elements);
(void) my_net_write(&thd->net, buff, (size_t) (pos-buff));
}
#ifndef DBUG_OFF
field_types= (enum_field_types*) thd->alloc(sizeof(field_types) *
list->elements);
uint count= 0;
#endif
while ((item=it++))
{
char *pos;
CHARSET_INFO *cs= system_charset_info;
Send_field field;
item->make_field(&field);
/* Keep things compatible for old clients */
if (field.type == MYSQL_TYPE_VARCHAR)
field.type= MYSQL_TYPE_VAR_STRING;
prot.prepare_for_resend();
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
if (prot.store(STRING_WITH_LEN("def"), cs, thd_charset) ||
prot.store(field.db_name, (uint) strlen(field.db_name),
cs, thd_charset) ||
prot.store(field.table_name, (uint) strlen(field.table_name),
cs, thd_charset) ||
prot.store(field.org_table_name, (uint) strlen(field.org_table_name),
cs, thd_charset) ||
prot.store(field.col_name, (uint) strlen(field.col_name),
cs, thd_charset) ||
prot.store(field.org_col_name, (uint) strlen(field.org_col_name),
cs, thd_charset) ||
local_packet->realloc(local_packet->length()+12))
goto err;
/* Store fixed length fields */
pos= (char*) local_packet->ptr()+local_packet->length();
*pos++= 12; // Length of packed fields
if (item->collation.collation == &my_charset_bin || thd_charset == NULL)
{
/* No conversion */
int2store(pos, field.charsetnr);
int4store(pos+2, field.length);
}
else
{
/* With conversion */
uint max_char_len;
int2store(pos, thd_charset->number);
/*
For TEXT/BLOB columns, field_length describes the maximum data
length in bytes. There is no limit to the number of characters
that a TEXT column can store, as long as the data fits into
the designated space.
For the rest of textual columns, field_length is evaluated as
char_count * mbmaxlen, where character count is taken from the
definition of the column. In other words, the maximum number
of characters here is limited by the column definition.
*/
max_char_len= (field.type >= (int) MYSQL_TYPE_TINY_BLOB &&
field.type <= (int) MYSQL_TYPE_BLOB) ?
field.length / item->collation.collation->mbminlen :
field.length / item->collation.collation->mbmaxlen;
int4store(pos+2, max_char_len * thd_charset->mbmaxlen);
}
pos[6]= field.type;
int2store(pos+7,field.flags);
pos[9]= (char) field.decimals;
pos[10]= 0; // For the future
pos[11]= 0; // For the future
pos+= 12;
}
else
{
if (prot.store(field.table_name, (uint) strlen(field.table_name),
cs, thd_charset) ||
prot.store(field.col_name, (uint) strlen(field.col_name),
cs, thd_charset) ||
local_packet->realloc(local_packet->length()+10))
goto err;
pos= (char*) local_packet->ptr()+local_packet->length();
#ifdef TO_BE_DELETED_IN_6
if (!(thd->client_capabilities & CLIENT_LONG_FLAG))
{
pos[0]=3;
int3store(pos+1,field.length);
pos[4]=1;
pos[5]=field.type;
pos[6]=2;
pos[7]= (char) field.flags;
pos[8]= (char) field.decimals;
pos+= 9;
}
else
#endif
{
pos[0]=3;
int3store(pos+1,field.length);
pos[4]=1;
pos[5]=field.type;
pos[6]=3;
int2store(pos+7,field.flags);
pos[9]= (char) field.decimals;
pos+= 10;
}
}
local_packet->length((uint) (pos - local_packet->ptr()));
if (flags & SEND_DEFAULTS)
item->send(&prot, &tmp); // Send default value
if (prot.write())
break; /* purecov: inspected */
#ifndef DBUG_OFF
field_types[count++]= field.type;
#endif
}
if (flags & SEND_EOF)
write_eof_packet(thd, &thd->net);
DBUG_RETURN(prepare_for_send(list));
err:
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES),
MYF(0)); /* purecov: inspected */
DBUG_RETURN(1); /* purecov: inspected */
}
bool Protocol::write()
{
DBUG_ENTER("Protocol::write");
DBUG_RETURN(my_net_write(&thd->net, (uchar*) packet->ptr(),
packet->length()));
}
#endif /* EMBEDDED_LIBRARY */
/*
Send \0 end terminated string
SYNOPSIS
store()
from NullS or \0 terminated string
NOTES
In most cases one should use store(from, length) instead of this function
RETURN VALUES
0 ok
1 error
*/
bool Protocol::store(const char *from, CHARSET_INFO *cs)
{
if (!from)
return store_null();
uint length= strlen(from);
return store(from, length, cs);
}
/*
Send a set of strings as one long string with ',' in between
*/
bool Protocol::store(I_List<i_string>* str_list)
{
char buf[256];
String tmp(buf, sizeof(buf), &my_charset_bin);
uint32 len;
I_List_iterator<i_string> it(*str_list);
i_string* s;
tmp.length(0);
while ((s=it++))
{
tmp.append(s->ptr);
tmp.append(',');
}
if ((len= tmp.length()))
len--; // Remove last ','
return store((char*) tmp.ptr(), len, tmp.charset());
}
/****************************************************************************
Functions to handle the simple (default) protocol where everything is
This protocol is the one that is used by default between the MySQL server
and client when you are not using prepared statements.
All data are sent as 'packed-string-length' followed by 'string-data'
****************************************************************************/
#ifndef EMBEDDED_LIBRARY
void Protocol_text::prepare_for_resend()
{
packet->length(0);
#ifndef DBUG_OFF
field_pos= 0;
#endif
}
bool Protocol_text::store_null()
{
#ifndef DBUG_OFF
field_pos++;
#endif
char buff[1];
buff[0]= (char)251;
return packet->append(buff, sizeof(buff), PACKET_BUFFER_EXTRA_ALLOC);
}
#endif
/*
Auxilary function to convert string to the given character set
and store in network buffer.
*/
bool Protocol::store_string_aux(const char *from, size_t length,
CHARSET_INFO *fromcs, CHARSET_INFO *tocs)
{
/* 'tocs' is set 0 when client issues SET character_set_results=NULL */
if (tocs && !my_charset_same(fromcs, tocs) &&
fromcs != &my_charset_bin &&
tocs != &my_charset_bin)
{
uint dummy_errors;
return (convert->copy(from, length, fromcs, tocs, &dummy_errors) ||
net_store_data((uchar*) convert->ptr(), convert->length()));
}
return net_store_data((uchar*) from, length);
}
bool Protocol_text::store(const char *from, size_t length,
CHARSET_INFO *fromcs, CHARSET_INFO *tocs)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_DECIMAL ||
field_types[field_pos] == MYSQL_TYPE_BIT ||
field_types[field_pos] == MYSQL_TYPE_NEWDECIMAL ||
(field_types[field_pos] >= MYSQL_TYPE_ENUM &&
field_types[field_pos] <= MYSQL_TYPE_GEOMETRY));
field_pos++;
#endif
return store_string_aux(from, length, fromcs, tocs);
}
bool Protocol_text::store(const char *from, size_t length,
CHARSET_INFO *fromcs)
{
CHARSET_INFO *tocs= this->thd->variables.character_set_results;
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_DECIMAL ||
field_types[field_pos] == MYSQL_TYPE_BIT ||
field_types[field_pos] == MYSQL_TYPE_NEWDECIMAL ||
field_types[field_pos] == MYSQL_TYPE_NEWDATE ||
(field_types[field_pos] >= MYSQL_TYPE_ENUM &&
field_types[field_pos] <= MYSQL_TYPE_GEOMETRY));
field_pos++;
#endif
return store_string_aux(from, length, fromcs, tocs);
}
bool Protocol_text::store_tiny(longlong from)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 || field_types[field_pos] == MYSQL_TYPE_TINY);
field_pos++;
#endif
char buff[20];
return net_store_data((uchar*) buff,
(size_t) (int10_to_str((int) from, buff, -10) - buff));
}
bool Protocol_text::store_short(longlong from)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_YEAR ||
field_types[field_pos] == MYSQL_TYPE_SHORT);
field_pos++;
#endif
char buff[20];
return net_store_data((uchar*) buff,
(size_t) (int10_to_str((int) from, buff, -10) -
buff));
}
bool Protocol_text::store_long(longlong from)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_INT24 ||
field_types[field_pos] == MYSQL_TYPE_LONG);
field_pos++;
#endif
char buff[20];
return net_store_data((uchar*) buff,
(size_t) (int10_to_str((long int)from, buff,
(from <0)?-10:10)-buff));
}
bool Protocol_text::store_longlong(longlong from, bool unsigned_flag)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_LONGLONG);
field_pos++;
#endif
char buff[22];
return net_store_data((uchar*) buff,
(size_t) (longlong10_to_str(from,buff,
unsigned_flag ? 10 : -10)-
buff));
}
bool Protocol_text::store_decimal(const my_decimal *d)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_NEWDECIMAL);
field_pos++;
#endif
char buff[DECIMAL_MAX_STR_LENGTH];
String str(buff, sizeof(buff), &my_charset_bin);
(void) my_decimal2string(E_DEC_FATAL_ERROR, d, 0, 0, 0, &str);
return net_store_data((uchar*) str.ptr(), str.length());
}
bool Protocol_text::store(float from, uint32 decimals, String *buffer)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_FLOAT);
field_pos++;
#endif
buffer->set_real((double) from, decimals, thd->charset());
return net_store_data((uchar*) buffer->ptr(), buffer->length());
}
bool Protocol_text::store(double from, uint32 decimals, String *buffer)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_DOUBLE);
field_pos++;
#endif
buffer->set_real(from, decimals, thd->charset());
return net_store_data((uchar*) buffer->ptr(), buffer->length());
}
bool Protocol_text::store(Field *field)
{
if (field->is_null())
return store_null();
#ifndef DBUG_OFF
field_pos++;
#endif
char buff[MAX_FIELD_WIDTH];
String str(buff,sizeof(buff), &my_charset_bin);
CHARSET_INFO *tocs= this->thd->variables.character_set_results;
#ifndef DBUG_OFF
TABLE *table= field->table;
my_bitmap_map *old_map= 0;
if (table->file)
old_map= dbug_tmp_use_all_columns(table, table->read_set);
#endif
field->val_str(&str);
#ifndef DBUG_OFF
if (old_map)
dbug_tmp_restore_column_map(table->read_set, old_map);
#endif
return store_string_aux(str.ptr(), str.length(), str.charset(), tocs);
}
/*
TODO:
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
*/
bool Protocol_text::store(MYSQL_TIME *tm)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_DATETIME ||
field_types[field_pos] == MYSQL_TYPE_TIMESTAMP);
field_pos++;
#endif
char buff[40];
uint length;
length= my_sprintf(buff,(buff, "%04d-%02d-%02d %02d:%02d:%02d",
(int) tm->year,
(int) tm->month,
(int) tm->day,
(int) tm->hour,
(int) tm->minute,
(int) tm->second));
if (tm->second_part)
length+= my_sprintf(buff+length,(buff+length, ".%06d",
(int)tm->second_part));
return net_store_data((uchar*) buff, length);
}
bool Protocol_text::store_date(MYSQL_TIME *tm)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_DATE);
field_pos++;
#endif
char buff[MAX_DATE_STRING_REP_LENGTH];
size_t length= my_date_to_str(tm, buff);
return net_store_data((uchar*) buff, length);
}
/*
TODO:
Second_part format ("%06") needs to change when
we support 0-6 decimals for time.
*/
bool Protocol_text::store_time(MYSQL_TIME *tm)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_TIME);
field_pos++;
#endif
char buff[40];
uint length;
uint day= (tm->year || tm->month) ? 0 : tm->day;
length= my_sprintf(buff,(buff, "%s%02ld:%02d:%02d",
tm->neg ? "-" : "",
(long) day*24L+(long) tm->hour,
(int) tm->minute,
(int) tm->second));
if (tm->second_part)
length+= my_sprintf(buff+length,(buff+length, ".%06d", (int)tm->second_part));
return net_store_data((uchar*) buff, length);
}
/****************************************************************************
Functions to handle the binary protocol used with prepared statements
Data format:
[ok:1] reserved ok packet
[null_field:(field_count+7+2)/8] reserved to send null data. The size is
calculated using:
bit_fields= (field_count+7+2)/8;
2 bits are reserved for identifying type
of package.
[[length]data] data field (the length applies only for
string/binary/time/timestamp fields and
rest of them are not sent as they have
the default length that client understands
based on the field type
[..]..[[length]data] data
****************************************************************************/
bool Protocol_binary::prepare_for_send(List<Item> *item_list)
{
Protocol::prepare_for_send(item_list);
bit_fields= (field_count+9)/8;
if (packet->alloc(bit_fields+1))
return 1;
/* prepare_for_resend will be called after this one */
return 0;
}
void Protocol_binary::prepare_for_resend()
{
packet->length(bit_fields+1);
bzero((uchar*) packet->ptr(), 1+bit_fields);
field_pos=0;
}
bool Protocol_binary::store(const char *from, size_t length,
CHARSET_INFO *fromcs)
{
CHARSET_INFO *tocs= thd->variables.character_set_results;
field_pos++;
return store_string_aux(from, length, fromcs, tocs);
}
bool Protocol_binary::store(const char *from, size_t length,
CHARSET_INFO *fromcs, CHARSET_INFO *tocs)
{
field_pos++;
return store_string_aux(from, length, fromcs, tocs);
}
bool Protocol_binary::store_null()
{
uint offset= (field_pos+2)/8+1, bit= (1 << ((field_pos+2) & 7));
/* Room for this as it's allocated in prepare_for_send */
char *to= (char*) packet->ptr()+offset;
*to= (char) ((uchar) *to | (uchar) bit);
field_pos++;
return 0;
}
bool Protocol_binary::store_tiny(longlong from)
{
char buff[1];
field_pos++;
buff[0]= (uchar) from;
return packet->append(buff, sizeof(buff), PACKET_BUFFER_EXTRA_ALLOC);
}
bool Protocol_binary::store_short(longlong from)
{
field_pos++;
char *to= packet->prep_append(2, PACKET_BUFFER_EXTRA_ALLOC);
if (!to)
return 1;
int2store(to, (int) from);
return 0;
}
bool Protocol_binary::store_long(longlong from)
{
field_pos++;
char *to= packet->prep_append(4, PACKET_BUFFER_EXTRA_ALLOC);
if (!to)
return 1;
int4store(to, from);
return 0;
}
bool Protocol_binary::store_longlong(longlong from, bool unsigned_flag)
{
field_pos++;
char *to= packet->prep_append(8, PACKET_BUFFER_EXTRA_ALLOC);
if (!to)
return 1;
int8store(to, from);
return 0;
}
bool Protocol_binary::store_decimal(const my_decimal *d)
{
#ifndef DBUG_OFF
DBUG_ASSERT(field_types == 0 ||
field_types[field_pos] == MYSQL_TYPE_NEWDECIMAL);
field_pos++;
#endif
char buff[DECIMAL_MAX_STR_LENGTH];
String str(buff, sizeof(buff), &my_charset_bin);
(void) my_decimal2string(E_DEC_FATAL_ERROR, d, 0, 0, 0, &str);
return store(str.ptr(), str.length(), str.charset());
}
bool Protocol_binary::store(float from, uint32 decimals, String *buffer)
{
field_pos++;
char *to= packet->prep_append(4, PACKET_BUFFER_EXTRA_ALLOC);
if (!to)
return 1;
float4store(to, from);
return 0;
}
bool Protocol_binary::store(double from, uint32 decimals, String *buffer)
{
field_pos++;
char *to= packet->prep_append(8, PACKET_BUFFER_EXTRA_ALLOC);
if (!to)
return 1;
float8store(to, from);
return 0;
}
bool Protocol_binary::store(Field *field)
{
/*
We should not increment field_pos here as send_binary() will call another
protocol function to do this for us
*/
if (field->is_null())
return store_null();
return field->send_binary(this);
}
bool Protocol_binary::store(MYSQL_TIME *tm)
{
char buff[12],*pos;
uint length;
field_pos++;
pos= buff+1;
int2store(pos, tm->year);
pos[2]= (uchar) tm->month;
pos[3]= (uchar) tm->day;
pos[4]= (uchar) tm->hour;
pos[5]= (uchar) tm->minute;
pos[6]= (uchar) tm->second;
int4store(pos+7, tm->second_part);
if (tm->second_part)
length=11;
else if (tm->hour || tm->minute || tm->second)
length=7;
else if (tm->year || tm->month || tm->day)
length=4;
else
length=0;
buff[0]=(char) length; // Length is stored first
return packet->append(buff, length+1, PACKET_BUFFER_EXTRA_ALLOC);
}
bool Protocol_binary::store_date(MYSQL_TIME *tm)
{
tm->hour= tm->minute= tm->second=0;
tm->second_part= 0;
return Protocol_binary::store(tm);
}
bool Protocol_binary::store_time(MYSQL_TIME *tm)
{
char buff[13], *pos;
uint length;
field_pos++;
pos= buff+1;
pos[0]= tm->neg ? 1 : 0;
if (tm->hour >= 24)
{
/* Fix if we come from Item::send */
uint days= tm->hour/24;
tm->hour-= days*24;
tm->day+= days;
}
int4store(pos+1, tm->day);
pos[5]= (uchar) tm->hour;
pos[6]= (uchar) tm->minute;
pos[7]= (uchar) tm->second;
int4store(pos+8, tm->second_part);
if (tm->second_part)
length=12;
else if (tm->hour || tm->minute || tm->second || tm->day)
length=8;
else
length=0;
buff[0]=(char) length; // Length is stored first
return packet->append(buff, length+1, PACKET_BUFFER_EXTRA_ALLOC);
}
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