C#中的UPDATE命令参数对于Access 2003不更新

Question

访问2003 vs 2010 c#

我看不出哪里出错了.没有错误,但没有更新数据.我有插入,删除和编辑工作,但我不知道为什么我不能让它工作.请有人在此帮助我,提前谢谢......

连接字符串

 myCon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data 
 Source=C:..\TempDB.mdb");

更新方法......

    private void btnUpdate_Click(object sender, EventArgs e)
    {
        OleDbCommand cmd = new OleDbCommand();
        cmd.CommandType = CommandType.Text;

        cmd.CommandText = "UPDATE [Family] SET [FirstName] = ?, [LastName] = ?, [FamilyDOB] = ?, [Medical] = ? WHERE [ID] = ?";
        //tried this as well
        //cmd.CommandText = "UPDATE [Family] SET [FirstName] = FirstName, [LastName] = @LastName, [DOB] = @StudentDOB, [Medical] = @Medical WHERE [ID] = @ID";
        cmd.Parameters.AddWithValue("@ID", txtFamID.Text);
        cmd.Parameters.AddWithValue("@FirstName", txtFirstName.Text);
        cmd.Parameters.AddWithValue("@LastName", txtLastName.Text);
        cmd.Parameters.AddWithValue("@FamDOB", txtFamDOB.Text);
        cmd.Parameters.AddWithValue("@Medical", txtMedical.Text);

        cmd.Connection = myCon;
        myCon.Open();
        cmd.ExecuteNonQuery();
        myCon.Close();
    }

Answer 1

以与SQL语句中出现的顺序相同的顺序提供参数值.

cmd.Parameters.AddWithValue("@FirstName", txtFirstName.Text);
cmd.Parameters.AddWithValue("@LastName", txtLastName.Text);
cmd.Parameters.AddWithValue("@FamDOB", txtFamDOB.Text);
cmd.Parameters.AddWithValue("@Medical", txtMedical.Text);
cmd.Parameters.AddWithValue("@ID", txtFamID.Text);

OleDB加MS Access不关心参数名称,只关心它们的顺序.