m_columnClasses[idx] = this._getOid(idx+1).getJavaClass();
m_columnClasses[idx] = _getOid(_this, idx+1).getJavaClass();
	public Class getColumnClass(int index)	throws SQLException	{		if(m_columnClasses == null)		{			synchronized(Backend.THREADLOCK)			{								int top = this._size();				m_columnClasses = new Class[top];				for(int idx = 0; idx < top; ++idx)					m_columnClasses[idx] = this._getOid(idx+1).getJavaClass();			}		}		return m_columnClasses[index-1];	}