将图片等文件保存到sqlite中（c#）_c# sqlite存图片

 SqLite.net的dll为System.Data.SQLite.dll，这种dll分为32位、64位和适用于compactframework三种，在引用时要注意，选择正确的dll。

将要保存图片的字段类型设为blob。代码如下：
private void savePicture（） { using (SQLiteConnection cnn = new SQLiteConnection(dbPath)) { cnn.Open(); using (SQLiteCommand cmd = cnn.CreateCommand()) { //cmd.CommandText = "Create Table test(data Image)"; //cmd.ExecuteNonQuery(); cmd.CommandText = "insert into person values('12',@data,'14','13')"; SQLiteParameter para = new SQLiteParameter("@data", DbType.Binary); string file = @"F:/Image/飞机.png"; FileStream fs = new FileStream(file, FileMode.Open); //StreamUtil su = new StreamUtil(); //byte[] buffer = su.StreamToBytes(fs); byte[] buffer = StreamUtil.ReadFully(fs); fs.Close(); para.Value = buffer; cmd.Parameters.Add(para); cmd.ExecuteNonQuery(); } } }

其中StreamUtil为自定义的一个类：

public static class StreamUtil { const int BufferSize = 8192; public static void CopyTo(Stream input,Stream output) { byte[] buffer = new byte[BufferSize]; int read; while ((read = input.Read(buffer, 0, buffer.Length)) > 0) { output.Write(buffer, 0, read); } } public static byte[] ReadFully(Stream input) { using (MemoryStream tempStream = new MemoryStream()) { CopyTo(input, tempStream); return tempStream.ToArray(); } } }

参考：http://www.kaiyuan8.org/Article/qfuoQyWKDicoYpoirorz.aspx
C#教程:声明和调用扩展方法：http://www.webjx.com/aspnet/2009-04-12/11229.html

http://topic.csdn.net/u/20081024/09/9b2bf0ad-ec15-4b00-9994-3124038ba329.html

该方法主要是利用了 SQLiteParameter 的功能，读取blob字段。代码如下：

 FileStream m_filestream = null; 　　 try { 　　 m_filestream = new FileStream(@"d:/pcinfo/17.jpg", FileMode.Open, FileAccess.Read); //读取图片 SQLiteCommand m_commd2=new SQLiteCommand(); m_commd2.CommandText="UPDATE test1 set timage=@idimage WHERE tparendid=78"; 　　 Byte[] m_byte = new Byte[m_filestream.Length]; //存放图片 m_filestream.Read(m_byte,0,m_byte.Length); m_filestream.Close(); SQLiteParameter param_m=new SQLiteParameter("@idimage",DbType.Binary,m_byte.Length, ParameterDirection.Input,false,0,0,null,DataRowVersion.Current,m_byte); m_commd2.Parameters.Add(param_m); m_commd2.Parameters.Add(param_m); //很多参数阿，注意DBType.Binary 　　 m_commd2.Connection = m_conn; m_commd2.ExecuteNonQuery(); 　 　} catch (SQLiteException ex) { MessageBox.Show("未能存入图片"); 　　 }