Question

I have two table named: Blog for displaying blogs post and comments for displaying comments section for each blog post.

The fields for these are as follows:

For Blog:

1: blog_id

2: title

3: body

4: author

5: updated

For Comments:

1: comments_id

2: name

3: email

4: body

5: blog_id

The field blog_id must be the same for both the table.

Now what i want is that suppose for blog_id = “2”, I am writing comment, so what would be the insert query so that when i visit index.php?blog_id=2, I get the comments for only that particular post.

I mean how to insert the comments for a particular blog_id?

I tried this query to insert:

INSERT INTO cms.comments(blog_id, name,email,comments_body)
                VALUES (
                    '".$arr['blog_id']."',
                    '".$arr['name']."',

                    '".$arr['email']."',
                    '".$arr['body']."'
                ) );

Answer 1

Ok, I have done it myself [NO need to implement foreign key].

Here is the solutions.

The requirement was that the field “blog_id” of comments must be equal to “blog_id” of blog

This can be done in the following manner. First get the blog’s “blog_id” by the following statement…

$sql = "SELECT * from blog WHERE blog_id = '$blog_id'";
$res = mysql_query($sql) or die(mysql_error());
$row = mysql_fetch_assoc($res);
$iItemId = (int)$_POST['blog_id']; // obtaining necessary information

The using INSERT statement like this, insert it…

mysql_query("INSERT INTO amityadav.comments(blog_id, name,url,email,body)
                VALUES (
                    '$iItemId',   //This variable is from the blog_posts' "blog_id" which will be inserted into the comment's "blog_id"
                    '".$arr['name']."',
                    '".$arr['url']."',
                    '".$arr['email']."',
                    '".$arr['body']."'
                )");

Now in order to retrieve it use the flowing query…

$sql = "SELECT * from blog WHERE blog_id = '$blog_id'";
$res = mysql_query($sql) or die(mysql_error());
$row = mysql_fetch_assoc($res);
$iItemId = (int)$_GET['blog_id']; // obtaining necessary information
$comments = array();
$result = mysql_query("SELECT * FROM comments WHERE `blog_id` = '{$iItemId}' ORDER BY comments.id ASC ");

Using these queries, I have successfully implemented what I wanted…:)