C#实现复制数据库 C#将A数据库数据转到B数据库

本文章以一个表为例，要转多个表则可将DataSet关联多个表，下面给出完整代码，包括引用以及main函数与复制函数。
要说明的是，必须先用Sql语句复制表结构，才能顺利的使用以下代码复制数据。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Data.Common; 

namespace CopyData
{
 class Program
 {
  static void Main(string[] args)
  {
   //要复制的表名
   string table = "V_Position"; 

   //构造连接字符串
   SqlConnectionStringBuilder builder1 = new SqlConnectionStringBuilder();
   builder1.DataSource = ".\\CANFLY";  //实例名称为CANFLY
   builder1.InitialCatalog = "desdata"; //目标数据库
   builder1.IntegratedSecurity = true;  //使用Windows身份验证 

   SqlConnectionStringBuilder builder2 = new SqlConnectionStringBuilder();
   builder2.DataSource = ".\\CANFLY";
   builder2.InitialCatalog = "bddata";  //源数据库
   builder2.IntegratedSecurity = true; 

   //调用复制数据库函数
   InsertTable(builder1.ConnectionString, builder2.ConnectionString, table);
  } 

  //参数为两个数据库的连接字符串
  private static void InsertTable(string conString1, string conString2, string tabStr)
  {
   //连接数据库
   SqlConnection conn1 = new SqlConnection();
   conn1.ConnectionString = conString1;
   conn1.Open(); 

   SqlConnection conn2 = new SqlConnection();
   conn2.ConnectionString = conString2;
   conn2.Open(); 

   //填充DataSet1
   SqlDataAdapter adapter1 = new SqlDataAdapter("select * from " + tabStr, conn1);
   DataSet dataSet1 = new DataSet(); 

   if (dataSet1 != null)
   {
    adapter1.Fill(dataSet1, tabStr);
   } 

   SqlDataAdapter adapter2 = new SqlDataAdapter("select * from " + tabStr, conn2);
   DataSet dataSet2 = new DataSet(); 

   SqlCommand cmd2 = new SqlCommand("select count(*) from " + tabStr, conn2);
   Object res2 = cmd2.ExecuteScalar(); 

   if (res2 != null)
   {
    int nCount = Convert.ToInt32(res2.ToString());
    if (nCount == 0)
    {
     conn1.Close();
     conn2.Close();
     return;
    }
   } 

   //填充DataSet2
   if (dataSet2 != null)
   {
    adapter2.Fill(dataSet2, tabStr);
   } 

   //复制数据
   for (int j = 0; j < dataSet2.Tables[0].Rows.Count; j++)
   {
    dataSet1.Tables[0].LoadDataRow(dataSet2.Tables[0].Rows[j].ItemArray, false);
   } 

   //将DataSet变换显示在与其关联的目标数据库
   SqlCommandBuilder cb = new SqlCommandBuilder(adapter1);
   adapter1.Update(dataSet1, tabStr);
   cb.RefreshSchema(); 

   Console.WriteLine("表" + tabStr + "复制成功！"); 

   conn1.Close();
   conn2.Close(); 

  }
 }
}

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