C# ASPX插入到MySQL数据库

我对编程一无所知，在将数据插入表

ticket

时遇到了问题。该代码在语法或逻辑上是否有错误，应该插入ticket信息？我没有得到任何错误，但它也没有插入数据

using (MySqlCommand newercmd = new MySqlCommand("INSERT INTO ticket (StudentID, ClassID, TicketTitle, TicketStatus, Module, ExcerciseNumber, TCode, StartingTime) VALUES (Select StudentID from student where GlobalID = @GlobalID, @ClassID, @TicketTitle, '1', @Module, @Excercise, @TCode, NOW()", con))
{
    newercmd.Parameters.AddWithValue("GlobalID", globalbox.Text);
    newercmd.Parameters.AddWithValue("ClassID", ClassBox.Text);
    newercmd.Parameters.AddWithValue("TicketTitle", TitleBox.Text);
    newercmd.Parameters.AddWithValue("Module", ModuleBox.Text);
    newercmd.Parameters.AddWithValue("Excercise", ExcerciseBox.Text);
    newercmd.Parameters.AddWithValue("TCode", TcodeBox.Text);

    newercmd.ExecuteNonQuery();
    con.Close();
}

完整的aspx.cs代码如下：

protected void Button1_Click(object sender, EventArgs e)
{

    using (MySqlConnection con = new MySqlConnection(@"............"))
    {

        string checkglobal = "select count(*) from student where GlobalID= @GlobalID";
        MySqlCommand cmd = new MySqlCommand(checkglobal, con);

        con.Open();

        cmd.Parameters.AddWithValue("@GlobalID", globalbox.Text);
        var objectuserexists = cmd.ExecuteScalar();
        int userexists = Convert.ToInt32(objectuserexists);

        // if exists do nothing as we already have them stored!
        if (userexists > 0)
        { }
        else
        {
            // does not exists insert into student table
            using (MySqlCommand newcmd = new MySqlCommand("INSERT INTO student (GlobalID) values (@GlobalID)", con))
            {
                newcmd.Parameters.AddWithValue("GlobalID", globalbox.Text);

                newcmd.ExecuteNonQuery();

            }


            {

                //insert into ticket table
                using (MySqlCommand newercmd = new MySqlCommand("INSERT INTO ticket (StudentID, ClassID, TicketTitle, TicketStatus, Module, ExcerciseNumber, TCode, StartingTime) VALUES (Select StudentID from student where GlobalID = @GlobalID, @ClassID, @TicketTitle, '1', @Module, @Excercise, @TCode, NOW()", con))
                {
                    newercmd.Parameters.AddWithValue("GlobalID", globalbox.Text);
                    newercmd.Parameters.AddWithValue("ClassID", ClassBox.Text);
                    newercmd.Parameters.AddWithValue("TicketTitle", TitleBox.Text);
                    newercmd.Parameters.AddWithValue("Module", ModuleBox.Text);
                    newercmd.Parameters.AddWithValue("Excercise", ExcerciseBox.Text);
                    newercmd.Parameters.AddWithValue("TCode", TcodeBox.Text);

                    newercmd.ExecuteNonQuery();
                    con.Close();
                }

            }

        }
    }
}

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我想这可能是我的骗局。现在进行测试，试图找出问题所在，但在using块中有一个conn.close（）。当你有一个using块时，你不调用conn.close；释放对象时会为您调用它（“使用”就是这样做的）。请检查您与正确数据库的连接，并检查从

newercmd.ExecuteNonQuery（）返回的rowsAffected我想这可能是我的骗局。现在进行测试，试图找出问题所在，但在using块中有一个conn.close（）。当你有一个using块时，你不调用conn.close；释放对象时会为您调用它（“使用”就是这样做的）。请检查您与正确数据库的连接，并检查从
newercmd.ExecuteNonQuery（）返回的rowsAffected