在.Net1.1中无论是对于批量插入整个DataTable中的所有数据到数据库中,还是进行不同数据源之间的迁移,都不是很方便。而 在.Net2.0中,SQLClient命名空间下增加了几个新类帮助我们通过DataTable或DataReader批量迁移数据。数据源可以来自关 系数据库或者XML文件,甚至WebService返回结果。其中最重要的一个类就是SqlBulkCopy类,使用它可以很方便的帮助我们把数据源的数 据迁移到目标数据库中。
下面我们先通过一个简单的例子说明这个类的使用:
首先:web.config
<connectionStrings>
<add name="srcDBConnection" connectionString="server=.;database=pubs;uid=sa;pwd="/>
<add name="desDBConnection" connectionString="server=.;database=NorthWind;uid=sa;pwd="/>
</connectionStrings>
C#文件: 前台不Copy了,就一个按钮,一个Label
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
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public partial class ASP_NET : System.Web.UI.Page
{
private DateTime startTime;
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protected void Button1_Click(object sender, EventArgs e)
{
startTime = DateTime.Now;
string srcConnString = "";
string desConnString = "";
SqlConnection srcConnection = new SqlConnection();
SqlConnection desConnection = new SqlConnection();
SqlCommand sqlcmd = new SqlCommand();
SqlDataAdapter da = new SqlDataAdapter();
DataTable dt = new DataTable();
//srcConnString = ConfigurationManager.ConnectionStrings["srcDBConnection"].ConnectionString;
desConnString = ConfigurationManager.ConnectionStrings["desDBConnection"].ToString();
//srcConnection.ConnectionString = srcConnString;
srcConnection.ConnectionString = desConnString;
sqlcmd.Connection = srcConnection;
//sqlcmd.CommandText = "select * from jobs";
sqlcmd.CommandText = "select * from abc";
sqlcmd.CommandType = CommandType.Text;
sqlcmd.Connection.Open();
da.SelectCommand = sqlcmd;
da.Fill(dt);
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SqlBulkCopy sbc = new SqlBulkCopy(desConnString,SqlBulkCopyOptions.UseInternalTransaction);
sbc.BulkCopyTimeout = 5000;
sbc.SqlRowsCopied +=new SqlRowsCopiedEventHandler(OnRowsCopied);
sbc.NotifyAfter = dt.Rows.Count;
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try
{
// sbc.DestinationTableName = "jobs";
sbc.DestinationTableName = "bcd";
sbc.WriteToServer(dt);
}
catch (Exception ex)
{
lblCounter.Text = ex.Message.ToString();
}
finally
{
sqlcmd.Clone();
srcConnection.Close();
desConnection.Close();
}
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}
private void OnRowsCopied(object sender, SqlRowsCopiedEventArgs args)
{
lblCounter.Text += args.RowsCopied.ToString() + " rows are copied<Br>";
TimeSpan copyTime = DateTime.Now - startTime;
lblCounter.Text += "Copy Time:" + copyTime.Seconds.ToString() + "." + copyTime.Milliseconds.ToString() + " seconds";
}
}
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代码分析:
SqlBulkCopy sbc = new SqlBulkCopy(desConnString,SqlBulkCopyOptions.UseInternalTransaction);
先生成SqlBulkCopy 实例,构造函数指定了目标数据库,使用SqlBulkCopyOptions.UseInternalTransaction是指迁移动作指定在一个Transaction当中,如果数据迁移中产生错误或异常将发生回滚。
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sbc.BulkCopyTimeout = 5000000; //指定操作完成的Timeout时间
sbc.SqlRowsCopied +=new SqlRowsCopiedEventHandler(OnRowsCopied);
sbc.NotifyAfter = dt.Rows.Count;
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try
{
// sbc.DestinationTableName = "jobs";
sbc.DestinationTableName = "bcd";
sbc.WriteToServer(dt);
}
NotifyAfter 属性指定通知通知事件前处理的数据行数,在这里指定为表的行数,并添加SqlRowsCopied事件输出整个迁移过程的时间。 WriteToServer方法就是将数据源拷备到目标数据库。在使用WriteToServer方法之前必须先指定 DestinationTableName属性,也就是目标数据库的表名,
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性能方面:我在Sql中用proc插入68万条数据花了近8分钟,用SqlBulkCopy花了53.234秒~,效率高了7倍耶!不过现在也不做这方面的底层了,呵呵,把自己写的一个测试存储过程也贴上吧,方便自己学习
create table abc
(
aid int identity(1,1) primary key,
adesc varchar(50) not null
)
go
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/**********存储过程**********************/
create proc addData
as
declare @i int
set @i=1
while @i < 1000000
begin
insert into abc values ('testDescription')
set @i = @i + 1
end
go
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select * into titles from pubs.dbo.titles where 1> 3 复制跨数据库的表结构
转自http://blog.csdn.net/huaer1011/archive/2008/04/21/2312361.aspx