Question

请尝试更新查询工作正常时帮助我，但更改不会影响数据库值。我正在使用ms access 2010数据库并通过C＃.net

进行操作

    private void update()
    {
        try
        {
            conn = new OleDbConnection(cs.DBConn);
            conn.Open();

            string cb="update Student_Data set Student_Name=@s2,Father_Name=@s3,Mother_Name=@s4,DOB=@s5,Standard=@s6,Addmission_For_Batch=@s7,Gender=@8,Joining_Date=@s9,Package_Fees=@s10,Fees_Mode=@s11,School_College_Name=@s12,Address=@s13,Parents_Contact=@s14,Self_Contact=@s15,SMS_Contact=@s16,Email_ID=@s17,Religion=@s18,Caste_Quoto=@s19,Total_Fees=@s20,Prefered_Batch=@s21,Photo=@22 where Addmission_Number=@d1";

            OleDbCommand cmd = new OleDbCommand(cb);
            cmd.Connection = conn;
           cmd.Parameters.Add(new OleDbParameter ("@d1", System.Data.OleDb.OleDbType.VarChar, 15, "Addmission_Number"));
            cmd.Parameters.Add(new OleDbParameter("@s2",System.Data.OleDb.OleDbType.VarChar,40,"Student_Name"));
            cmd.Parameters.Add(new OleDbParameter("@s3", System.Data.OleDb.OleDbType.VarChar, 40, "Father_Name"));
            cmd.Parameters.Add(new OleDbParameter("@s4",System.Data.OleDb.OleDbType.VarChar,40,"Mother_Name"));
            cmd.Parameters.Add(new OleDbParameter("@s5", System.Data.OleDb.OleDbType.DBDate, 15, "DOB"));
            cmd.Parameters.Add(new OleDbParameter("@s6", System.Data.OleDb.OleDbType.VarChar, 20, "Standard"));
            cmd.Parameters.Add(new OleDbParameter("@s7", System.Data.OleDb.OleDbType.VarChar, 20, "Addmission_For_Batch"));
            cmd.Parameters.Add(new OleDbParameter("@s8", System.Data.OleDb.OleDbType.VarChar, 10, "Gender"));
            cmd.Parameters.Add(new OleDbParameter("@s9", System.Data.OleDb.OleDbType.VarChar, 20, "Joining_Date"));
            cmd.Parameters.Add(new OleDbParameter("@s10", System.Data.OleDb.OleDbType.Integer, 10, "Package_Fees"));
            cmd.Parameters.Add(new OleDbParameter("@s11", System.Data.OleDb.OleDbType.VarChar, 15, "Fees_Mode"));
            cmd.Parameters.Add(new OleDbParameter("@s12", System.Data.OleDb.OleDbType.VarChar, 20, "School_College_Name"));
            cmd.Parameters.Add(new OleDbParameter("@s13", System.Data.OleDb.OleDbType.VarChar, 40, "Address"));
            cmd.Parameters.Add(new OleDbParameter("@s14", System.Data.OleDb.OleDbType.VarChar, 15, "Parents_Contact"));
            cmd.Parameters.Add(new OleDbParameter("@s15", System.Data.OleDb.OleDbType.VarChar, 15, "Self_Contact"));
            cmd.Parameters.Add(new OleDbParameter("@s16", System.Data.OleDb.OleDbType.VarChar, 15, "SMS_Contact"));
            cmd.Parameters.Add(new OleDbParameter("@s17", System.Data.OleDb.OleDbType.VarChar, 40, "Email_ID"));
            cmd.Parameters.Add(new OleDbParameter("@s18", System.Data.OleDb.OleDbType.VarChar, 20, "Religion"));
            cmd.Parameters.Add(new OleDbParameter("@s19", System.Data.OleDb.OleDbType.VarChar, 20, "Caste_Quoto"));
            cmd.Parameters.Add(new OleDbParameter("@s20", System.Data.OleDb.OleDbType.VarChar, 20, "Total_Fees"));
            cmd.Parameters.Add(new OleDbParameter("@s21", System.Data.OleDb.OleDbType.VarChar, 20, "Prefered_Batch"));

            cmd.Parameters["@d1"].Value = ScholarNo.Text.Trim();
            cmd.Parameters["@s2"].Value =TxtStudName.Text.Trim();
            cmd.Parameters["@s3"].Value =TxtFathername.Text.Trim();
            cmd.Parameters["@s4"].Value =TxtMotherName.Text.Trim();
            cmd.Parameters["@s5"].Value = DTPDob.Text.Trim();
            cmd.Parameters["@s6"].Value = TxtStandard.Text.Trim();
            cmd.Parameters["@s7"].Value = TxtAdmForBatch.Text.Trim();
            cmd.Parameters["@s8"].Value = CmbGender.Text.Trim();
            cmd.Parameters["@s9"].Value = DTPJoiningdate.Text.Trim();
            cmd.Parameters["@s10"].Value = TxtPackagefees.Text.Trim();
            cmd.Parameters["@s11"].Value = CmbMode.Text.Trim();
            cmd.Parameters["@s12"].Value = TxtSchooclg.Text.Trim();
            cmd.Parameters["@s13"].Value =TxtAddress.Text.Trim();
            cmd.Parameters["@s14"].Value = TxtParentContact.Text.Trim();
            cmd.Parameters["@s15"].Value = TxtSelfcntct.Text.Trim();
            cmd.Parameters["@s16"].Value = TxtSmsCntct.Text.Trim();
            cmd.Parameters["@s17"].Value =TxtEmailID.Text.Trim();
            cmd.Parameters["@s18"].Value =CMBreligion.Text.Trim();
            cmd.Parameters["@s19"].Value = CmbCastqta.Text.Trim();
            cmd.Parameters["@s20"].Value = TxtTotalfees.Text.Trim();
            cmd.Parameters["@s21"].Value = TxtPreferdBatch.Text.Trim();

            ms = new MemoryStream();
            Bitmap bmpImage = new Bitmap(PicBox.Image);

            bmpImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            byte[] data = ms.GetBuffer();
            OleDbParameter p = new OleDbParameter("@s22", OleDbType.VarBinary);
            p.Value = data;
            cmd.Parameters.Add(p);

            cmd.ExecuteNonQuery();
            MessageBox.Show("Successfully Updated", "Student Record", MessageBoxButtons.OK, MessageBoxIcon.Information);
            BtnViewdtl.Enabled = false;

            conn.Close();


        }

        catch (OleDbException ex)
        {
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        finally
        {
            conn.Close();

        }
    }

Answer 1

OleDbCommand不支持命名参数。实际上它支持，但它不是关心。只关心他们的订单。

据我所知，您的参数定义和参数顺序不相同。

例如，您的Student_Name=@s2参数与您的@d1参数定义匹配。

更改参数添加部分与声明命令相同。此外，我会使用using statement自动处理您的连接和命令，而不是手动调用Close方法。

如果除此之外一切都很好，这应该解决它。

当我要更新我的数据库值时，那么更改将不会影响数据库

1 个答案: