SQL-Query PHP -Blog - php

Question

I am sure that somewhere in the web this question has been already asked but i have not found it, because i don't know for what exactly i should search. So i will try to describe the problem:
I have a Blog written in PHP and a SQL-database, where i receive the needed data.
Each Blog entry contains 1 image and 1 text-field and has its own id.
To get this data i execute this query (pseudo-code) -> this is working fine:
foreach($db->query("SELECT news.id, news.position, news_text.date, news_text.text, news_images.image
FROM news
LEFT OUTER JOIN news_text ON news.id=news_text.id
LEFT OUTER JOIN news_images ON news_images.id = news.id
ORDER BY position") as $row){
echo "{$row['id']}";
echo "{$row['position']}";
echo "{$row['date']}";
echo "{$row['text']}";
echo "{$row['image']}";
}
Now the problem starts. I want to add a comment field, where users can add a message. So for each blog-entry there can be several comments (would probably be a 1:n connection).
- I tried to add a foreach loop in a foreach loop (stupid)
- I tried with several SQL-query but only get rubbish as a result
- I don't see the logic how to connect the database news_comment with the others
Here is my simplified database:
Can someone give me a hint how i could solve this problem. Result should be:
foreach($db->query("SELECT news.id, news.position, news_text.date, news_text.text, news_images.image
FROM news
LEFT OUTER JOIN news_text ON news.id=news_text.id
LEFT OUTER JOIN news_images ON news_images.id = news.id
ORDER BY position") as $row){
echo "{$row['id']}";
echo "{$row['position']}";
echo "{$row['date']}";
echo "{$row['text']}";
echo "{$row['image']}";
Here i get for each blog-entry the corresponding comments..
}
Thank you.
Misch

Answer 1

You should retrieve comments in another one query (not in loop) using the same conditions as for retrieving news. So that after executing both queries you will have to arrays: news and comments.
Then you just need to take appropriate comments for each news item.
To do that you might need to rebuild comments array so that comment news_id will be an index of array where comments are stored.
Finally it'd look like this:
$news = [
[
'id' => ...,
'position' => ...
<so on>
]
];
$comments = [
$news[0]['id'] = [<comment array>],
<so on>
];
That's the way most framework use to have data bound in result set.

Answer 2

Solved it with the help of Alex(thx) and MulipleIterator. This is how it worked for me (maybe someone has a better solution).
foreach($db->query("SELECT news.id, news.position, news_text.date, news_text.text, news_images.image
FROM news
LEFT OUTER JOIN news_text ON news.id=news_text.id
LEFT OUTER JOIN news_images ON news_images.id = news.id
ORDER BY position") as $row)
{
$news_id[] = $row['id'];
$news_text[] = $row['news_text'];
$news_images[] = $row['news_images'];
$values = new MultipleIterator();
$values->attachIterator(new ArrayIterator($news_id));
$values->attachIterator(new ArrayIterator($news_text));
$values->attachIterator(new ArrayIterator($news_images));
}
foreach($values as $value)
{
list($news_text, $news_images, $news_id) = $value;
{
echo '$news_text';
echo '$news_images';
foreach($db->query("SELECT comment FROM news_comment WHERE id = $news_id ") as $row)
{
echo "{$row['comment']}";
}
}
}