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C#实现复制数据库 C#将A数据库数据转到B数据库

2017-12-13 11:11 来源:未知 编辑:admin

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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