使用OleDbCommand对象更新SQL Server中的二进制文件

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使用OleDbCommand对象更新 SQL Server中的二进制文件

作者朱二利用ADO.NET中的OleDbConnectionOleDbCommand 可以方便的对SQL Server中的二进制文件进行更新操作，下面是详细的代码演示演示环境：数据库机器名：s_test登陆名：sa密码：7890数据库名 db_test下面建立一个表： create table tb_test(id int identity(1,1),photo image ,constraint pk_tb_test primary key(id)) 一、将硬盘上的文件保存至数据库(C#) //----------------------------------------------------------//----------------------------------------------------------//下面的示例将c:1.txt文件保存至数据库的tb_test表中//----------------------------------------------------------//----------------------------------------------------------using System;using System.IO;?using System.Data;using System.Data.OleDb;class image_test{[STAThread]static void Main(string[] args){try{//初始化OleDbConnection和OleDbCommandOleDbConnection cn = new OleDbConnection("provider=SQLoledb;Server=s_test;user id=sa;password=7890;initial catalog=db_test");OleDbCommand cmd = new OleDbCommand("INSERT tb_test(photo) VALUES(?)",cn);//打开文件FileStream fs = new FileStream("c:/1.txt", FileMode.Open, FileAccess.Read);Byte[] b = new Byte[fs.Length];fs.Read(b, 0, b.Length);fs.Close();//打开连接OleDbParameter prm = new OleDbParameter("@photo",OleDbType.VarBinary ,b.Length,?ParameterDirection.Input, false, 0, 0, null,DataRowVersion.Current, b);cmd.Parameters.Add(prm);cn.Open();//执行if (cmd.ExecuteNonQuery() == 1)Console.WriteLine("OK");elseConsole.WriteLine("Fail");?cn.Close();}catch(Exception ex){Console.WriteLine(ex.Message );}}}? 三、更新数据库中保存的文件 //----------------------------------------------------------//----------------------------------------------------------//下面的示例用将数据库的tb_test表中ID=1的记录的photo更新为c:1.txt//----------------------------------------------------------//----------------------------------------------------------using System;using System.IO;?using System.Data;using System.Data.OleDb;class image_test{[STAThread]static void Main(string[] args){try{//初始化OleDbConnection和OleDbCommandOleDbConnection cn = new OleDbConnection("provider=SQLoledb;Server=s_test;user id=sa;password=7890;initial catalog=db_test");OleDbCommand cmd = new OleDbCommand("UPDATE tb_test SET photo= ? WHERE ID=1",cn);//打开文件FileStream fs = new FileStream("c:/1.txt", FileMode.Open, FileAccess.Read);Byte[] b = new Byte[fs.Length];fs.Read(b, 0, b.Length);fs.Close();//打开连接OleDbParameter prm = new OleDbParameter("@photo",OleDbType.VarBinary ,b.Length,?ParameterDirection.Input, false, 0, 0, null,DataRowVersion.Current, b);cmd.Parameters.Add(prm);cn.Open();//执行if (cmd.ExecuteNonQuery() == 1)Console.WriteLine("OK");elseConsole.WriteLine("Fail");?cn.Close();}catch(Exception ex){Console.WriteLine(ex.Message );}}} <script type="text/javascript"></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>