C#WinForm中，用于将图片以二进制存入sql数据库中，并将图片从数据库中取出，显示在PictureBox控件中。

Posted 2023-04-18

C#WinForm中，用于将图片以二进制存入sql数据库中，并将图片从数据库中取出，显示在PictureBox控件中。要详细代码。最好有注释。

插入： //单击图片选择添加的图片 private void pic_Click(object sender, EventArgs e)
dlg.Filter = "JPG|*.jpg|BMP|*.bmp|PNG|*.png";
if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)

pic.Image = Image.FromFile(dlg.FileName);
txtFilePath = dlg.FileName;

public byte[] picData; public string txtFilePath = ""; 添加确定按钮代码： f (txtFilePath != "")

try

FileStream fs = new FileStream(txtFilePath, FileMode.Open, FileAccess.Read);
int len = Convert.ToInt32(fs.Length);
b = new byte[len];
fs.Read(b, 0, len);
fs.Close();

catch

b = null;

SqlConnection conn = new SqlConnection(strConn);
conn.Open(); SqllCommand cmdInsert = new SqlCommand();
cmdInsert.Connection = conn;
cmdInsert.CommandText =插入语句； cmdInsert.Parameters.Add("@照片", SqlDbType.Image); if (txtFilePath == "")

cmdInsert.Parameters["@照片"].Value = DBNull.Value;

else

cmdInsert.Parameters["@照片"].Value = b;

cmdInsert.ExecuteNonQuery();
conn.Close();获取: public byte[] picData; SqlConnection conn = new SqlConnection(strConn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from 联系人 where 编号=" + ID.ToString();
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataSet ds = new DataSet(); sda.Fill(ds); if (ds.Tables[0].Rows.Count == 1)

if (ds.Tables[0].Rows[0]["照片"] == DBNull.Value)
//pic为picturebox控件
pic.Image = PhoneBoook.Properties.Resources.DeskShade;//为空的话给个默认图片

else

byte[] b = (byte[])(ds.Tables[0].Rows[0]["照片"]);
pic.Image = Image.FromStream(new MemoryStream(b));
picData = b;

参考技术A 首先把图片转化成2进制流
Image _Image = Image.FromFile(@"C:\1.jpg");
System.IO.MemoryStream _ImageMem = new System.IO.MemoryStream();
_Image.Save(_ImageMem, ImageFormat.Bmp);
byte[] _ImageBytes = _ImageMem.GetBuffer();
然后同样的方法放入数据库
SqlCommand _SqlCommand = new SqlCommand("Insert into ImageTable(name,image)values(@name,@image)");
_SqlCommand.Parameters.Add(new SqlParameter("@name", SqlDbType.VarChar, 20));
_SqlCommand.Parameters.Add(new SqlParameter("@image", SqlDbType.Image));

_SqlCommand.Parameters[0].Value = "ImageName";
_SqlCommand.Parameters[1].Value = _ImageBytes;
执行这个SQLCOMMAND
读出的时候相反

具体的 代码：

//保存图片：
SqlConnection conn = new SqlConnection(@"data source=.;uid=sa;pwd=;database=master"); conn.Open();
SqlCommand cmd = new SqlCommand("insert into image values(@i)", conn);
byte[] ib = new byte[60000];
FileStream fs = new FileStream(this.openFileDialog1.FileName.ToString(), FileMode.Open, FileAccess.Read); fs.Read(ib, 0, 60000);
cmd.Parameters.Add("@i", SqlDbType.Image, (int)fs.Length);
cmd.Parameters["@i"].Value = ib;
cmd.ExecuteNonQuery();
conn.Close();
MessageBox.Show("保存成功"); /
/显示图片：
SqlConnection conn = new SqlConnection(@"data source=.;uid=sa;pwd=;database=master"); conn.Open();
SqlCommand cmd = new SqlCommand("select image1 from image", conn);
SqlDataReader reader = cmd.ExecuteReader();
reader.Read();
while (reader.Read())
for (int i = 0; i < reader.FieldCount; i++)
MemoryStream buf = new MemoryStream((byte[])reader[i]); I
mage image = Image.FromStream(buf,true);
this.pictureBox1.Image = image;

参考技术B 创建一张测试表(sqlserver2000)
create table [pictable] (
[id] [int] identity (1, 1) not null ,
[img] [image] not null
) on [primary] textimage_on [primary]
go
1,插入数据库的方法(sqlserver2000)this.getConnection() 为获得连接的方法.
public void insertPic(String path)...
Connection con = this.getConnection();
String sql = "insert into picTable values(?)" ;
try ...
PreparedStatement pstm = con.prepareStatement(sql);
InputStream is = new FileInputStream(path);

pstm.setBinaryStream(1, is, is.available());
int count = pstm.executeUpdate();
if(count>0)...
System.out.println("插入成功");
else...
System.out.println("插入失败");

is.close();
pstm.close();
con.close();

catch (Exception e) ...
e.printStackTrace();

2,从数据库中读出来的方法.(sqlserver2000)
public void readPic(int id)...
Connection con = this.getConnection();
String sql = "select * from picTable where id=?" ;
try ...
PreparedStatement pstm = con.prepareStatement(sql);
pstm.setInt(1, id);
ResultSet rs = pstm.executeQuery();
rs.next();
InputStream is = rs.getBinaryStream(2);

OutputStream os = new FileOutputStream("f:/temp.jpg");
byte[] buff = new byte[1024];
int len = is.read(buff);
while( len !=-1 )...
os.write(buff);
len = is.read(buff);

System.out.println("写入成功");
is.close();
os.close();
pstm.close();
con.close();
catch (Exception e) ...
e.printStackTrace();

求助c# winform中将图片存入数据库详细写法

将textbox数据随图片一起存入数据库：
如个人姓名，个人性别，照片同时用 insert语句直接存入数据库
要求是将图片插入数据库，不是存储路径

可以将图片解析为二进制，然后存二进制。
表设置四个字段，ID，NAME,SEX,PHOTO，图片是二进制的，一句SQL就搞定。 参考技术A 直接存取图片路径