点击spatialite-gui的"Load CSV/TXT"按钮，弹出选择文件窗体，选择预先到处来的txt文件，文件实例如下：
"BM","COUNTRY","PARENTBM"
"字符串","字符串","字符串"
"210000000000","辽宁省","000000000000"
"210100000000","沈阳市","210000000000"
"210112000000","东陵区","210100000000"
之所以在第二行增加“字符串”是为了告诉gui，我添加的是字符串类型，否则gui会默认为整形，造成编码溢出。
之后按照如下设置加载文件即可。
