我很难将文件保存到MySQL数据库。
我设法使用此代码将图像保存到数据库
SqlConnection con = new SqlConnection(Properties.Settings.Default.NorthWestConnectionString);
SqlDataAdapter da = new SqlDataAdapter("Select * From MyImages", con);
SqlCommandBuilder MyCB = new SqlCommandBuilder(da);
DataSet ds = new DataSet("MyImages");
da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
FileStream fs = new FileStream(@"C:\Users\Ruan\Downloads\Gone Fishing.BMP", FileMode.OpenOrCreate, FileAccess.Read);
byte[] MyData = new byte[fs.Length];
fs.Read(MyData, 0, System.Convert.ToInt32(fs.Length));
fs.Close();
da.Fill(ds, "MyImages");
DataRow myRow;
myRow = ds.Tables["MyImages"].NewRow();
myRow["Description"] = "This would be description text";
myRow["imgField"] = MyData;
ds.Tables["MyImages"].Rows.Add(myRow);
da.Update(ds, "MyImages");
txtboxPassword.Text = MyData.ToString();
con.Close();
但事实是，这增加了一条新线。我只想将图像/ doc添加到现有行。 （最好是文件）
我通常使用此代码更新数据库中的字段。
SqlConnection conn = new SqlConnection();
conn.ConnectionString = Properties.Settings.Default.Studentsdb1ConnectionString;
SqlCommand cmd = new SqlCommand();
cmd.CommandType = CommandType.Text;
String SQL = String.Format("UPDATE Students SET First_Name = '{0}' , Last_Name = '{1}', Birth_Date = '{2}' WHERE Student_Nr = '{3}'", txtName.Text, txtSurname.Text, Convert.ToDateTime(dateTimePicker1.Text).ToString("d"), SelectedStudentNr);
cmd.CommandText = SQL;
cmd.Connection = conn;
object result = null;
ConnectionState previousConnectionState = conn.State;
try
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
result = cmd.ExecuteScalar();
}
catch (SqlException ex)
{
MessageBox.Show(ex.Message);
}
finally
{
if (previousConnectionState == ConnectionState.Closed)
{
conn.Close();
}
所以现在我似乎无法存储文件？我错过了某个地方。
你能帮帮我吗？