this(null);
connection = conn; defaultSizes.put(new Integer(Types.CHAR),          "254"); defaultSizes.put(new Integer(Types.VARCHAR),       "254"); defaultSizes.put(new Integer(Types.LONGVARCHAR),   "254"); defaultSizes.put(new Integer(Types.BINARY),        "254"); defaultSizes.put(new Integer(Types.VARBINARY),     "254"); defaultSizes.put(new Integer(Types.LONGVARBINARY), "254"); defaultSizes.put(new Integer(Types.INTEGER),       "32"); defaultSizes.put(new Integer(Types.BIGINT),        "64"); defaultSizes.put(new Integer(Types.REAL),          "7,0"); defaultSizes.put(new Integer(Types.FLOAT),         "15,0"); defaultSizes.put(new Integer(Types.DOUBLE),        "15,0"); defaultSizes.put(new Integer(Types.DECIMAL),       "15,15"); defaultSizes.put(new Integer(Types.NUMERIC),       "15,15");
    public JdbcModelReader()    {        this(null);    }