image类型的字段，取出来保存成一个文件的例子？急！
image类型的字段，取出来保存成一个文件的例子？
是个图片文件。
问题点数：100、回复次数：3Top
1 楼kaixin110（kydk.com）回复于 2006-07-03 15:52:19 得分 50
SqlConnection pubsConn = new SqlConnection("Data Source=localhost;Integrated Security=SSPI;Initial Catalog=pubs;");
SqlCommand logoCMD = new SqlCommand("SELECT pub_id, logo FROM pub_info", pubsConn);
FileStream fs; // Writes the BLOB to a file (*.bmp).
BinaryWriter bw; // Streams the BLOB to the FileStream object.
int bufferSize = 100; // Size of the BLOB buffer.
byte[] outbyte = new byte[bufferSize]; // The BLOB byte[] buffer to be filled by GetBytes.
long retval; // The bytes returned from GetBytes.
long startIndex = 0; // The starting position in the BLOB output.
string pub_id = ""; // The publisher id to use in the file name.
// Open the connection and read data into the DataReader.
pubsConn.Open();
SqlDataReader myReader = logoCMD.ExecuteReader(CommandBehavior.SequentialAccess);
while (myReader.Read())
{
// Get the publisher id, which must occur before getting the logo.
pub_id = myReader.GetString(0);
// Create a file to hold the output.
fs = new FileStream("logo" + pub_id + ".bmp", FileMode.OpenOrCreate, FileAccess.Write);
bw = new BinaryWriter(fs);
// Reset the starting byte for the new BLOB.
startIndex = 0;
// Read the bytes into outbyte[] and retain the number of bytes returned.
retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize);
// Continue reading and writing while there are bytes beyond the size of the buffer.
while (retval == bufferSize)
{
bw.Write(outbyte);
bw.Flush();
// Reposition the start index to the end of the last buffer and fill the buffer.
startIndex += bufferSize;
retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize);
}
// Write the remaining buffer.
bw.Write(outbyte, 0, (int)retval - 1);
bw.Flush();
// Close the output file.
bw.Close();
fs.Close();
}
// Close the reader and the connection.
myReader.Close();
pubsConn.Close();
Top
2 楼WeekZero（∮小气的鬼∮）回复于 2006-07-03 15:57:02 得分 50
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;
using System.IO;
public partial class upfile_ToDB_ShowPic : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string id = Request.QueryString["id"];
if (id != null && id.CompareTo("") != 0)
{
string connStr = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
string SqlStr = "SELECT * FROM test02 where id = " + id;
DataSet ds = new DataSet();
try
{
SqlConnection conn = new SqlConnection(connStr);
if (conn.State.ToString() == "Closed") conn.Open();
SqlDataAdapter da = new SqlDataAdapter(SqlStr, conn);
da.Fill(ds, "test01");
if (conn.State.ToString() == "Open") conn.Close();
if (ds.Tables[0].Rows.Count > 0)
{
Byte[] FileByteArray =(byte[])ds.Tables[0].Rows[0]["pic"];
File.WriteAllBytes("d:\\a.jpg", FileByteArray);
Response.BinaryWrite((byte[])ds.Tables[0].Rows[0]["pic"]);
Response.End();
}
}
catch (Exception ex)
{
Response.Write("数据库错误，错误原因：" + ex.Message);
Response.End();
}
}
}
}
关键的2行:
Byte[] FileByteArray =(byte[])ds.Tables[0].Rows[0]["pic"];
File.WriteAllBytes("d:\\a.jpg", FileByteArray);Top
3 楼K_top（香奈儿）回复于 2006-07-03 16:04:07 得分 0
谢了，已经解决！Top
