VS.C#如何向数据数据库中存入和读取图片的?

首先，在数据库中要建立相应的字段能保存Bytes，例如在SQL Server中用Image类型来定义字段。我所用到的数据库大致结构如下：

字段名

类型

备注

FileID

Int

自增字段

FileName

Varchar(256)

FullName

Varchar(1024)

FileData

Image

然后就是写入数据库，代码如下：

FileInfo fi = new FileInfo( txtFileName.Text )// Replace with your file name

if ( fi.Exists)

{

byte[] bData = null

int nNewFileID = 0

// Read file data into buffer

using ( FileStream fs = fi.OpenRead() )

{

bData = new byte[fi.Length]

int nReadLength = fs.Read( bData,0, (int)(fi.Length) )

}

// Add file info into DB

string strQuery = "INSERT INTO FileInfo "

+ " ( FileName, FullName, FileData ) "

+ " VALUES "

+ " ( @FileName, @FullName, @FileData ) "

+ " SELECT @@IDENTITY AS 'Identity'"

SqlCommand sqlComm = new SqlCommand( strQuery, sqlConn )

sqlComm.Parameters.Add( "@FileName", fi.Name )

sqlComm.Parameters.Add( "@FullName", fi.FullName )

sqlComm.Parameters.Add( "@FileData", bData )

// Get new file ID

SqlDataReader sqlReader = sqlComm.ExecuteReader()

if( sqlReader.Read() )

{

nNewFileID = int.Parse(sqlReader.GetValue(0).ToString())

}

sqlReader.Close()

sqlComm.Dispose()

if( nNewFileID >0 )

{

// Add new item in list view

ListViewItem itmNew = lsvFileInfo.Items.Add( fi.Name )

itmNew.Tag = nNewFileID

}

}

而读出的代码如下：

// Get new file name

string strFullName = dlgFBSave.SelectedPath

if( strFullName[strFullName.Length - 1] != '\\' )

strFullName += @"\"

strFullName += lsvFileInfo.SelectedItems[0].Text

string strQuery = "SELECT FileData FROM FileInfo "

+ " WHERE FileID = " + lsvFileInfo.SelectedItems[0].Tag.ToString()

SqlDataAdapter sqlDAdapter = new SqlDataAdapter(strQuery,sqlConn)

DataSet sqlRecordSet = new DataSet()

byte[] bData = null

//Get file data from DB

try

{

sqlDAdapter.Fill( sqlRecordSet, "FileInfo" )

foreach( DataRow dr in sqlRecordSet.Tables["FileInfo"].Rows)

{

if( dr["FileData"] != DBNull.Value )

bData = ( byte[] )dr["FileData"]

}

}

catch(SqlException sqlErr)

{

MessageBox.Show( sqlErr.Message )

}

catch

{

MessageBox.Show( "Failed to read data from DB!" )

}

sqlRecordSet.Dispose()

sqlDAdapter.Dispose()

if( bData != null )

{

// Save file

FileInfo fi = new FileInfo( strFullName )

if( !fi.Exists )

{

//Create the file.

using (FileStream fs = fi.Create())

{

fs.Write( bData, 0, bData.Length)

}

}

else

{

//Create the file.

using (FileStream fs = fi.OpenWrite())

{

fs.Write( bData, 0, bData.Length)

}

}

}

不过需要提的一点，如果把大量的文件存入数据库的话，会造成数据库的臃肿，而且访问量也会增大。所以现在比较流行的做法，是把文件上传到服务器上，而在数据库上只保存文件的相对路径即可。那么访问的时候，先通过数据库得到文件的相对路径，然后再访问服务器上的文件

直接使用企业管理器好像没有办法 *** 作吧，通过软件或自己做个小软件读取。

#region//读取数据库中图片到内存.并显示

public void LoadToMemoryAndDisable(string serverAdress, string database)

{

//读取数据库中图片到内存.并显示

SqlConnection conn = new SqlConnection("server=" + serverAdress + "integrated security = sspidatabase = " + database)

SqlCommand cmd = new SqlCommand("select * from imgtable where imgname like '%bmp%'", conn)

conn.Open()

SqlDataReader dr

try

{

dr = cmd.ExecuteReader()

dr.Read()

System.Data.SqlTypes.SqlBinary sb = dr.GetSqlBinary(2)

//或byte[] imageData = (byte[])dr[2]

MemoryStream ms = new MemoryStream(sb.Value)//在内存中 *** 作图片数据

Bitmap bmp = new Bitmap(Bitmap.FromStream(ms))

this.pictureBox1.Image = bmp

dr.Close()

}

catch (Exception ex)

{

MessageBox.Show(ex.Message)

}

finally

{

conn.Close()

}

}

#endregion

试试下面的代码

byte[]barrImage =(byte[])获取的数据库中对应字段的值

MemoryStream ms = new MemoryStream( barrImage )

Image image = Image.FormStream(ms)

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