private void button7_Click(object sender, EventArgs e)
{
string conn = string.Empty;
string file = string.Empty;
string tableName = "";
int i = 0;
//方法一，写文件再导
using (BDBHelper dbHelper = new BDBHelper("DB2", conn))
{
i = dbHelper.LoadDataInLocalFile(tableName, file);
}
//方法二，转DataTable，再导入
DataTable dt = new DataTable();
using (BDBHelper dbHelper = new BDBHelper("DB2", conn))
{
//使用（适合数据量小，纯内存方式）
i = dbHelper.LoadDataInDataTable(tableName, dt);
//或者（适合数据量很大，超过10万的级别，内部会先写文件再导入）
i = dbHelper.LoadDataInDataTableWithFile(tableName, dt);
}
}