神奇的 SqlBulkCopy 高性能批量导入sqlserver
因为有利的开发环境，让我有机会来折腾一下ADO中的SqlBulkCopy这个功能。因为曾经公司做过库迁移，把数据从MSSQL2005迁到ORACLE下，当时本人用C#写了一个迁移工具，因当时对.NET操作数据库只是一般的熟练,没能发挥它的最佳性能和方法,写出来的工具在导数据的时候显示有点慢,后来改用BCP来导,BCP做数据导入还是非常快。时过几个月，心想自己再优化一下算法和方法，让数据迁移更快更方便，于是今天就先折腾一下.NET中的BCP批量导入功能. 测试环境: 1、WINDOWS SERVER 2003 +MSSQL2005（服务器） 2、LINUX+ORACLE 10G（服务器） 3、本人电脑配置：Pentium D 2.8G+2G内存 4、 本人操作系统：WINDOWS XP+VS2005+.NET FRAMEWORK2.0 5、从ORACLE数据库中导一张82万的数据到MSSQL2005中 程序代码: view plaincopy to clipboardprint?
using System;
using System.Data.SqlClient;
using System.Data.OracleClient;
class Program
{
static void Main()
{
string connectionString = GetOracleConnectionString();
try
{
using (OracleConnection sourceConnection = new OracleConnection(connectionString))
{
sourceConnection.Open();
OracleCommand commandRowCount = new OracleCommand( "SELECT COUNT(*) FROM 表", sourceConnection);
long countStart = System.Convert.ToInt32(
commandRowCount.ExecuteScalar());
Console.WriteLine("Starting row count = {0}", countStart);
DateTime Dt1=DateTime.Now;
Console.WriteLine("Start Reading Data....");
string Sqltxt="select * from 表";
OracleCommand commandSourceData = new OracleCommand(Sqltxt, sourceConnection);
OracleDataReader reader =
commandSourceData.ExecuteReader();
string desconnectionString=GetMsConnectionString();
Console.WriteLine("Start Moveing Data....");
using (SqlConnection destinationConnection = new SqlConnection(desconnectionString))
{
destinationConnection.Open();
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))
{
bulkCopy.BulkCopyTimeout=5000000;
bulkCopy.DestinationTableName ="dbo.表";
try
{
bulkCopy.WriteToServer(reader);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
reader.Close();
}
}
DateTime Dt2=DateTime.Now;
TimeSpan CountTime=Dt2.Subtract(Dt1);
long countEnd = System.Convert.ToInt32(
commandRowCount.ExecuteScalar());
Console.WriteLine("Ending row count = {0}", countEnd);
Console.WriteLine("{0} rows were added.", countEnd - countStart);
Console.WriteLine("用时:"+CountTime.Minutes.ToString()+"分"+CountTime.Seconds.ToString()+"秒"+CountTime.Milliseconds.ToString()+"毫秒");
Console.WriteLine("Press Enter to finish.");
Console.ReadLine();
}
}
}
catch(Exception ex)
{
Console.Write(ex.ToString());
}
}
private static string GetMsConnectionString()
{
return "uid=用户名;password=密码;database=库;server=192.168.X.X//sql2005";
}
private static string GetOracleConnectionString()
{
return "Data Source=库;User ID=用户名;Password=密码";
}
}
using System;
using System.Data.SqlClient;
using System.Data.OracleClient;
class Program
{
static void Main()
{
string connectionString = GetOracleConnectionString();
try
{
using (OracleConnection sourceConnection = new OracleConnection(connectionString))
{
sourceConnection.Open();
OracleCommand commandRowCount = new OracleCommand( "SELECT COUNT(*) FROM 表", sourceConnection);
long countStart = System.Convert.ToInt32(
commandRowCount.ExecuteScalar());
Console.WriteLine("Starting row count = {0}", countStart);
DateTime Dt1=DateTime.Now;
Console.WriteLine("Start Reading Data....");
string Sqltxt="select * from 表";
OracleCommand commandSourceData = new OracleCommand(Sqltxt, sourceConnection);
OracleDataReader reader =
commandSourceData.ExecuteReader();
string desconnectionString=GetMsConnectionString();
Console.WriteLine("Start Moveing Data....");
using (SqlConnection destinationConnection = new SqlConnection(desconnectionString))
{
destinationConnection.Open();
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))
{
bulkCopy.BulkCopyTimeout=5000000;
bulkCopy.DestinationTableName ="dbo.表";
try
{
bulkCopy.WriteToServer(reader);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
reader.Close();
}
}
DateTime Dt2=DateTime.Now;
TimeSpan CountTime=Dt2.Subtract(Dt1);
long countEnd = System.Convert.ToInt32(
commandRowCount.ExecuteScalar());
Console.WriteLine("Ending row count = {0}", countEnd);
Console.WriteLine("{0} rows were added.", countEnd - countStart);
Console.WriteLine("用时:"+CountTime.Minutes.ToString()+"分"+CountTime.Seconds.ToString()+"秒"+CountTime.Milliseconds.ToString()+"毫秒");
Console.WriteLine("Press Enter to finish.");
Console.ReadLine();
}
}
}
catch(Exception ex)
{
Console.Write(ex.ToString());
}
}
private static string GetMsConnectionString()
{
return "uid=用户名;password=密码;database=库;server=192.168.X.X//sql2005";
}
private static string GetOracleConnectionString()
{
return "Data Source=库;User ID=用户名;Password=密码";
}
}经测试通过 从ORACLE中导一张82万条数据的表到SQL2005中只花了2分钟多一点，当时我我非常惊讶，就连BCP导入也没这么快过，让我惊叹不已。 数据源可以是任意，但目标数据库一定要是MSSQL，这让我感到有点不爽，因为ORACLE.DATA.ORACLECLIENT命名空间没有这个类,也就是说你可以 从任何源数据导到MSSQL,这或许是微软的一种战略,让别人从其它数据库切换到MS数据库快更方便吧!