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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Brian Aker
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "drizzled/statement/execute.h"
#include "drizzled/session.h"
#include "drizzled/user_var_entry.h"
#include "drizzled/plugin/listen.h"
#include "drizzled/plugin/client.h"
#include "drizzled/plugin/null_client.h"
#include "drizzled/plugin/client/concurrent.h"
namespace drizzled
{
void mysql_parse(drizzled::Session *session, const char *inBuf, uint32_t length);
namespace statement
{
Execute::Execute(Session *in_session,
drizzled::execute_string_t to_execute_arg,
bool is_quiet_arg,
bool is_concurrent_arg) :
Statement(in_session),
is_quiet(is_quiet_arg),
is_concurrent(is_concurrent_arg),
to_execute(to_execute_arg)
{
}
bool statement::Execute::parseVariable()
{
if (to_execute.isVariable())
{
user_var_entry *var= getSession()->getVariable(to_execute, false);
if (var && var->length && var->value && var->type == STRING_RESULT)
{
LEX_STRING tmp_for_var;
tmp_for_var.str= var->value;
tmp_for_var.length= var->length;
to_execute.set(tmp_for_var);
return true;
}
}
return false;
}
bool statement::Execute::runStatement(plugin::NullClient *client, const std::string &arg)
{
client->pushSQL(arg);
if (not getSession()->executeStatement())
return true;
if (getSession()->is_error())
return true;
return false;
}
bool statement::Execute::execute()
{
if (to_execute.length == 0)
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "Invalid Variable");
return false;
}
if (to_execute.isVariable())
{
if (not parseVariable())
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "Invalid Variable");
return false;
}
}
if (is_concurrent)
{
if (getSession()->isConcurrentExecuteAllowed())
{
plugin::client::Concurrent *client= new plugin::client::Concurrent;
std::string execution_string(to_execute.str, to_execute.length);
client->pushSQL(execution_string);
Session::shared_ptr new_session(new Session(client));
// We set the current schema. @todo do the same with catalog
if (not getSession()->getSchema().empty())
new_session->set_db(getSession()->getSchema());
new_session->setConcurrentExecute(false);
// Overwrite the context in the next session, with what we have in our
// session. Eventually we will allow someone to change the effective
// user.
new_session->getSecurityContext()= getSession()->getSecurityContext();
if (Session::schedule(new_session))
Session::unlink(new_session);
}
else
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "A Concurrent Execution Session can not launch another session.");
return false;
}
}
else
{
if (is_quiet)
{
plugin::Client *temp= getSession()->getClient();
plugin::NullClient *null_client= new plugin::NullClient;
getSession()->setClient(null_client);
bool error_occured= false;
bool is_savepoint= false;
{
std::string start_sql;
if (getSession()->inTransaction())
{
// @todo Figure out something a bit more solid then this.
start_sql.append("SAVEPOINT execute_internal_savepoint");
is_savepoint= true;
}
else
{
start_sql.append("START TRANSACTION");
}
error_occured= runStatement(null_client, start_sql);
}
// @note this is copied from code in NULL client, all of this belongs
// in the pluggable parser pieces.
if (not error_occured)
{
typedef boost::tokenizer<boost::escaped_list_separator<char> > Tokenizer;
std::string full_string(to_execute.str, to_execute.length);
Tokenizer tok(full_string, boost::escaped_list_separator<char>("\\", ";", "\""));
for (Tokenizer::iterator iter= tok.begin();
iter != tok.end() and getSession()->getKilled() != Session::KILL_CONNECTION;
++iter)
{
if (runStatement(null_client, *iter))
{
error_occured= true;
break;
}
}
// @todo Encapsulate logic later to method
{
std::string final_sql;
if (is_savepoint)
{
if (error_occured)
{
final_sql.append("ROLLBACK TO SAVEPOINT execute_internal_savepoint");
}
else
{
final_sql.append("RELEASE SAVEPOINT execute_internal_savepoint");
}
}
else
{
if (error_occured)
{
final_sql.append("ROLLBACK");
}
else
{
final_sql.append("COMMIT");
}
}
// Run the cleanup command, we currently ignore if an error occurs
// here.
(void)runStatement(null_client, final_sql);
}
}
getSession()->setClient(temp);
if (getSession()->is_error())
{
getSession()->clear_error(true);
}
else
{
getSession()->clearDiagnostics();
}
getSession()->my_ok();
null_client->close();
delete null_client;
}
else
{
mysql_parse(getSession(), to_execute.str, to_execute.length);
}
}
// We have to restore ourselves at the top for delete() to work.
getSession()->getLex()->statement= this;
return true;
}
} /* namespace statement */
} /* namespace drizzled */
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