this.close();
	public boolean execute(String statement)	throws SQLException	{		ExecutionPlan plan = ExecutionPlan.prepare(			m_connection.nativeSQL(statement), null);		int result = SPI.getResult();		if(plan == null)			throw new SPIException(result);		try		{			return this.executePlan(plan, null);		}		finally		{			try { plan.close(); } catch(Exception e) {} 		}	}