write-after-read-protocol/sql/command_service.cc at master · FlashSQL/write-after-read-protocol · GitHub

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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */

#include "mysql/service_command.h"

#include "srv_session.h"

/**

@file

Command service implementation. For more information please check

the function comments.

/**

Executes a server command in a session.

There are two cases. Execution in a physical thread :

1. initialized by the srv_session service

2. NOT initialized by the srv_session service

In case of 1, if there is currently attached session, and it is

different from the passed one, the former will be automatically

detached. The session to be used for the execution will then be

attached. After the command is executed, the attached session will

not be detached. It will be detached by a next call to run_command()

with another session as parameter. In other words, for all sessions

used in a physical thread, there will be at most one in attached

state.

In case of 2, the current state (current_thd) will be

preserved. Then the given session will move to attached state and

the command will be executed. After the execution the state of the

session will be changed to detached and the preserved state

(current_thd) will be restored.

The client charset is used for commands like COM_QUERY and

COM_STMT_PREPARE to know how to threat the char* fields. This

charset will be used until the next call of run_command when it may

be changed again.

@param session The session

@param command The command to be executed.

@param data The data needed for the command to be executed

@param client_cs The charset for the string data input(COM_QUERY for example)

@param callbacks Callbacks to be used by the server to encode data and

to communicate with the client (plugin) side.

@param text_or_binary See enum cs_text_or_binary

@param service_callbacks_ctx Context passed to the command service callbacks

@return

0 success

1 failure

extern "C"

int command_service_run_command(Srv_session *session,

enum enum_server_command command,

const union COM_DATA * data,

const CHARSET_INFO * client_cs,

const struct st_command_service_cbs *callbacks,

enum cs_text_or_binary text_or_binary,

void * service_callbacks_ctx)

{

if (!session || !Srv_session::is_valid(session))

return true;

return session->execute_command(command, data, client_cs, callbacks,

text_or_binary, service_callbacks_ctx);

}

write-after-read-protocol/sql/command_service.cc at master · FlashSQL/write-after-read-protocol · GitHub

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