Ejemplo n.º 1
0
// Find an inactive incarnation of a system request. If necessary, clone it.
jrd_req* Jrd::Attachment::findSystemRequest(thread_db* tdbb, USHORT id, USHORT which)
{
	static const int MAX_RECURSION = 100;

	// If the request hasn't been compiled or isn't active, there're nothing to do.

	//Database::CheckoutLockGuard guard(this, dbb_cmp_clone_mutex);

	fb_assert(which == IRQ_REQUESTS || which == DYN_REQUESTS);

	JrdStatement* statement = (which == IRQ_REQUESTS ? att_internal[id] : att_dyn_req[id]);

	if (!statement)
		return NULL;

	// Look for requests until we find one that is available.

	for (int n = 0;; ++n)
	{
		if (n > MAX_RECURSION)
		{
			ERR_post(Arg::Gds(isc_no_meta_update) <<
						Arg::Gds(isc_req_depth_exceeded) << Arg::Num(MAX_RECURSION));
			// Msg363 "request depth exceeded. (Recursive definition?)"
		}

		jrd_req* clone = statement->getRequest(tdbb, n);

		if (!(clone->req_flags & (req_active | req_reserved)))
		{
			clone->req_flags |= req_reserved;
			return clone;
		}
	}
}
Ejemplo n.º 2
0
// Turn a parsed scratch into an executable request.
jrd_req* JrdStatement::makeRequest(thread_db* tdbb, CompilerScratch* csb, bool internalFlag)
{
	JrdStatement* statement = makeStatement(tdbb, csb, internalFlag);
	return statement->getRequest(tdbb, 0);
}
Ejemplo n.º 3
0
void InternalStatement::doPrepare(thread_db* tdbb, const string& sql)
{
	m_inMetadata->reset();
	m_outMetadata->reset();

	JAttachment* att = m_intConnection.getJrdAtt();
	JTransaction* tran = getIntTransaction()->getJrdTran();

	FbLocalStatus status;

	if (m_request)
	{
		doClose(tdbb, true);
		fb_assert(!m_allocated);
	}

	{
		EngineCallbackGuard guard(tdbb, *this, FB_FUNCTION);

		CallerName save_caller_name(tran->getHandle()->tra_caller_name);

		if (m_callerPrivileges)
		{
			jrd_req* request = tdbb->getRequest();
			JrdStatement* statement = request ? request->getStatement() : NULL;
			CallerName callerName;
			const Routine* routine;

			if (statement && statement->parentStatement)
				statement = statement->parentStatement;

			if (statement && statement->triggerName.hasData())
				tran->getHandle()->tra_caller_name = CallerName(obj_trigger, statement->triggerName);
			else if (statement && (routine = statement->getRoutine()) &&
				routine->getName().identifier.hasData())
			{
				if (routine->getName().package.isEmpty())
				{
					tran->getHandle()->tra_caller_name = CallerName(routine->getObjectType(),
						routine->getName().identifier);
				}
				else
				{
					tran->getHandle()->tra_caller_name = CallerName(obj_package_header,
						routine->getName().package);
				}
			}
			else
				tran->getHandle()->tra_caller_name = CallerName();
		}

		m_request.assignRefNoIncr(att->prepare(&status, tran, sql.length(), sql.c_str(),
			m_connection.getSqlDialect(), 0));
		m_allocated = (m_request != NULL);

		tran->getHandle()->tra_caller_name = save_caller_name;
	}

	if (status->getState() & IStatus::STATE_ERRORS)
		raise(&status, tdbb, "JAttachment::prepare", &sql);

	const DsqlCompiledStatement* statement = m_request->getHandle()->getStatement();

	if (statement->getSendMsg())
	{
		try
		{
			PreparedStatement::parseDsqlMessage(statement->getSendMsg(), m_inDescs,
				m_inMetadata, m_in_buffer);
			m_inputs = m_inMetadata->getCount();
		}
		catch (const Exception&)
		{
			raise(tdbb->tdbb_status_vector, tdbb, "parse input message", &sql);
		}
	}
	else
		m_inputs = 0;

	if (statement->getReceiveMsg())
	{
		try
		{
			PreparedStatement::parseDsqlMessage(statement->getReceiveMsg(), m_outDescs,
				m_outMetadata, m_out_buffer);
			m_outputs = m_outMetadata->getCount();
		}
		catch (const Exception&)
		{
			raise(tdbb->tdbb_status_vector, tdbb, "parse output message", &sql);
		}
	}
	else
		m_outputs = 0;

	m_stmt_selectable = false;

	switch (statement->getType())
	{
	case DsqlCompiledStatement::TYPE_SELECT:
	case DsqlCompiledStatement::TYPE_SELECT_UPD:
	case DsqlCompiledStatement::TYPE_SELECT_BLOCK:
		m_stmt_selectable = true;
		break;

	case DsqlCompiledStatement::TYPE_START_TRANS:
	case DsqlCompiledStatement::TYPE_COMMIT:
	case DsqlCompiledStatement::TYPE_ROLLBACK:
	case DsqlCompiledStatement::TYPE_COMMIT_RETAIN:
	case DsqlCompiledStatement::TYPE_ROLLBACK_RETAIN:
	case DsqlCompiledStatement::TYPE_CREATE_DB:
		Arg::Gds(isc_eds_expl_tran_ctrl).copyTo(&status);
		raise(&status, tdbb, "JAttachment::prepare", &sql);
		break;

	case DsqlCompiledStatement::TYPE_INSERT:
	case DsqlCompiledStatement::TYPE_DELETE:
	case DsqlCompiledStatement::TYPE_UPDATE:
	case DsqlCompiledStatement::TYPE_UPDATE_CURSOR:
	case DsqlCompiledStatement::TYPE_DELETE_CURSOR:
	case DsqlCompiledStatement::TYPE_DDL:
	case DsqlCompiledStatement::TYPE_EXEC_PROCEDURE:
	case DsqlCompiledStatement::TYPE_SET_GENERATOR:
	case DsqlCompiledStatement::TYPE_SAVEPOINT:
	case DsqlCompiledStatement::TYPE_EXEC_BLOCK:
		break;
	}
}