在sql中插入并更新图像
本文关键字:更新 图像 插入 sql | 更新日期: 2023-09-27 18:24:48
我通过从图片框中读取图像,将图像存储到test (id, name, image)
表中的数据库中。
这是我的代码:
private void browse_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "(*.BMP;*.JPG;*.GIF;*.JPEG;*.PNG)|*.BMP;*.JPG;*.GIF;*.JPEG;*.PNG";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
imgloc = openFileDialog1.FileName.ToString();
pictureBox1.ImageLocation = imgloc;
}
}
private void save_Click(object sender, EventArgs e)
{
byte[] img = null;
FileStream fs = new FileStream(imgloc, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
img = br.ReadBytes((int)fs.Length);
SqlConnection CN = new SqlConnection(constring);
string Query = "insert into test (id,name,image) values('" + txtid.Text + "','" + txtname.Text + "',@img)";
CN.Open();
cmd = new SqlCommand(Query, CN);
cmd.Parameters.Add(new SqlParameter("@img", img));
cmd.ExecuteNonQuery();
CN.Close();
}
它可以工作,但我想知道如何在这里使用update命令。
private void update_Click(object sender, EventArgs e)
{
byte[] img = null;
FileStream fs = new FileStream(imgloc, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
img = br.ReadBytes((int)fs.Length);
SqlConnection CN = new SqlConnection(constring);
// this is a smaple query for update statement and update where id=@id
string Query = "update test set name=@name,image=@img where id=@id ";
CN.Open();
cmd = new SqlCommand(Query, CN);
cmd.Parameters.Add(new SqlParameter("@img", img));
cmd.Parameters.Add(new SqlParameter("@id", txtid.Text));
cmd.Parameters.Add(new SqlParameter("@name", txtname.Text));
cmd.ExecuteNonQuery();
CN.Close();
}
您的代码和查询应该是这样的:
SqlConnection CN = new SqlConnection(constring);
string Query = "Update test Set name=@Name,image=@Image where id=@id"
CN.Open();
cmd = new SqlCommand(Query, CN);
cmd.Parameters.Add(new SqlParameter("@Image", img));
cmd.Parameters.Add(new SqlParameter("@Name",txtname.Text));
cmd.Parameters.Add(new SqlParameter("@id",txtid.Text));
cmd.ExecuteNonQuery();
CN.Close();
如果更新困难,只需使用Id字段删除该特定记录,然后再次启动Save查询。
SqlConnection con = Connectionclass.SQLCONNECTION();
SqlDataAdapter da = new SqlDataAdapter();
string query = ("Update Doctor set ID ='" + idtxt.Text + "',Name='" + nametxt.Text + "',Contact='" + contactxt.Text + "',CNIC='" + cnictxt.Text + "',Address='" + addresstxt.Text + "',Qualification='" + qualitxt.Text + "',specialization='" + specialtxt.Text + "',Gender='" + gendertxt.Text + "',DOB='" + dobtxt.Text + "', Fee='"+textBox1.Text+"',Date='" + System.DateTime.Today.ToString("dd-MM-yyyy") + "', Picture= @image where ID='" + idtxt.Text + "'");
da.UpdateCommand = new SqlCommand(query, con);
con.Open();
da.UpdateCommand.Parameters.Add("image", SqlDbType.VarBinary).Value = binaryphoto;
int RowsEffected = da.UpdateCommand.ExecuteNonQuery();
con.Close();