have I shot myself in the foot... that is the question!

Hey guys I think I've just royally shot myself in the foot. I have a website where users have the开发者_StackOverflowir own profile and can post on their walls but I'm getting to the point where I want to implement that friends can post on my wall and I can post on my friends wall.

This is what my site looks like so far:

My database design is like so:

And here is a code snippet of how I achieve posting on walls:

    protected void Button1_Click(object sender, EventArgs e)
    {
        string theUserId = Session["UserID"].ToString();
        using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=******;"))
        {
            cn.Open();
            using (OdbcCommand cmd = new OdbcCommand("INSERT INTO WallPosting (UserID, Wallpostings) VALUES (" + theUserId + ", '" + TextBox1.Text + "')", cn))
            {
                cmd.ExecuteNonQuery();
            }
        }
        PopulateWallPosts(theUserId);
    }
}

Now my problem is how on earth do I get friends posts on my wall AHHHHH... runs in fear!!!

Have I shot myself in the foot?

Also this is how I generate my content on the page:

private void PopulateWallPosts(string userId)
    {

        using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
        {
            cn.Open();
            using (OdbcCommand cmd = new OdbcCommand("SELECT idWallPosting, wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN User u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE wp.UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
            {
                //("SELECT wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN [User] u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
                using (OdbcDataReader reader = cmd.ExecuteReader())
                {
                    test1.Controls.Clear();

                    while (reader.Read())
                    {

                        System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
                        div.Attributes["class"] = "test";


                        div.ID = String.Format("{0}", reader.GetString(0));
                        string id = Convert.ToString(div.ID);
                        //store the div id as a string
                        Image img = new Image();
                        img.ImageUrl = String.Format("{0}", reader.GetString(2));
                        img.AlternateText = "Test image";

                        div.Controls.Add(img);
                        div.Controls.Add(ParseControl(String.Format("&nbsp&nbsp " + "{0}", reader.GetString(1))));
                        div.Attributes.Add("onclick", "confirm_delete(" + id + ");");
                        // send the div id to javascript
                        div.Style["clear"] = "both";
                        test1.Controls.Add(div);

                    }
                }
            }
        }
    }

Your WallPosting table needs another userId, representing who sent it ( The first one being whose wall it is).

Then just handle those two userids in your insertion code: Who sent it, who's it for.

EDIT Here's what a sample select would look like:

SELECT wp.WallPostings, p.PicturePath 
FROM WallPosting wp 
INNER JOIN [User] u ON u.UserID = wp.PostedByUserID 
INNER JOIN Pictures p ON p.UserID = u.UserID 
WHERE wp.UserID=" + userId + " 
ORDER BY idWallPosting DESC

I would also keep a record of at least what date/time the post was made and order by/display that.

I'd say you need to add another table called 'Walls', bind those to a User, and then have Wallpostings have a 'Wall Id', then just retrieve all WallPostings that have the ID equal to the ID of the user's wall..