C#将数据库导出成Excel，再从Excel导入到数据库中。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.IO;

namespace CindyDatabaseProcess

{

    class Program

    {

        static void Main(string[] args)

        {

            System.Data.DataTable dt1 = null;

            System.Data.DataTable dt2 = null;

SqlConnection conn = null;

            SqlCommand comm = null;

            SqlDataAdapter Adap = null;

            System.Data.DataSet ds = new System.Data.DataSet();
string sqltext = "select * from product";
conn = new SqlConnection("server=localhost;database=Cindy;Trusted_Connection=SSPI");

            conn.Open();

            comm = new SqlCommand(sqltext, conn);

            Adap = new SqlDataAdapter(comm);

            //ds = new System.Data.DataSet();

            Adap.Fill(ds, "product1");

            dt1 = ds.Tables["product1"];
conn = new SqlConnection("server=localhost;database=db_AjaxWall;Trusted_Connection=SSPI");

            conn.Open();

            comm = new SqlCommand(sqltext, conn);

            Adap = new SqlDataAdapter(comm);

            //ds = new System.Data.DataSet();

            Adap.Fill(ds, "product2");

            dt2 = ds.Tables["product2"];
foreach (System.Data.DataRow dr in dt1.Rows)

            {

                string ziduan1 = dr[0].ToString();

                string ziduan2 = dr[1].ToString();

                string ziduan3 = dr[2].ToString();

                string ziduan4 = dr[3].ToString();
System.IO.File.AppendAllText(@"C:\Users\lenovo\Desktop\xxx111.csv", ziduan1 + "," + ziduan2 + "," + ziduan3 + "," + ziduan4 + "\r\n", Encoding.UTF8);

            }

            foreach (System.Data.DataRow dr in dt2.Rows)

            {

                string ziduan1 = dr[0].ToString();

                string ziduan2 = dr[1].ToString();

                string ziduan3 = dr[2].ToString();

                string ziduan4 = dr[3].ToString();
System.IO.File.AppendAllText(@"C:\Users\lenovo\Desktop\xxx111.csv", ziduan1 + "," + ziduan2 + "," + ziduan3 + "," + ziduan4 + "\r\n", Encoding.UTF8);

            }
string[] aa = File.ReadAllLines(@"C:\Users\lenovo\Desktop\xxx111.csv", Encoding.UTF8);
StringBuilder sb=new StringBuilder();

            foreach (var item in aa)

            {

                string[] ss = item.Split(‘,‘);

                string sql=String.Format("insert into product values({0},‘{1}‘,{2},‘{3}‘);", ss[0], ss[1], ss[2], ss[3]);

                sb.Append(sql);

            }
comm = new SqlCommand(sb.ToString(), conn);

            int kk = comm.ExecuteNonQuery();

            Console.WriteLine(kk);

            Console.ReadKey();
}

    }

}

C#将数据库导出成Excel，再从Excel导入到数据库中。