Query mysql for post and comments system - mysql

Question

I'm using codeigniter for make a post and comments system. I did all the querys but I don't know how get the comments in the table post_comment. This is my query for take all the post shared. Thank you for the help.
function get_post_profile($user_id,$limit) {
$this->db->select('post_user.user_id,post_user.id_post_shared,post_shared.post_text,users.name,users.surname,users.id');
$this->db->join('post_shared', 'post_shared.id_post = post_user.id_post_shared');
$this->db->join('users','users.id = post_user.user_id');
$this->db->where('post_user.user_id',$user_id);
$this->db->order_by('post_user.id_post_shared','DESC');
$this->db->limit($limit);
$query = $this->db->get('post_user');
if ($query->num_rows() > 0) {
return $query->result();
} else {
return false;
}
}
users_table
id | name | surname |
1 jhon Smith
2 Sally Dunk
post_user table
id_post_shared | user_id |
1 1
post_share table
id_post | post_text
1 Hello guys
post_comment table
comment_text | id_post | id_user
Hello! 1 2

Answer 1

Try and reply:
$this->select('post_comment.comment_text, post_comment.id_post, post_comment.id_user')->join('post_share', 'post_share.id_post = post_comment.id_post')->join('users', 'users.id = post_comment.id_user')->get('post_comment');
EDIT
function get_comments(){
$data = array();
$posts = array();
$posts = $this->db->select('id_post as post_id, post_text', false)->order_by('id_post', 'desc')->get('post_share', 10)->result_array(); #get first 10 posts
if( is_array( $posts ) && count( $posts ) > 0 ){
foreach( $posts as $key=>$each ){
## gather the comments for the posts ###
$comments = array();
$comments = $this->db->select('comment_text, id_user')->where('id_post', $each['post_id'])->get('post_comment')->result_array();
if( is_array( $comments ) && count( $comments ) ){
$posts[$key]['comments'] = $comments;
}
}
}
return $posts;
}
EDIT 1
if( isset( $posts ) && is_array( $posts ) && count( $posts ) > 0 ){
foreach( $posts as $key=>$each ){
echo "Post id :".$each['post_id']." Post txt: ".$each['post_text']."<br>";
if( isset( $each['comments'] ) && is_array( $each['comments'] ) && count( $each['comments'] ) ){
foreach( $each['comments'] as $subKey=>$subEach ){
echo "Comment Txt :".$subEach['comment_text']."<br>";
}
}
}
}

Answer 2

Add LEFT JOIN to your post_comment
$this->db->select('post_user.user_id,post_user.id_post_shared,
post_shared.post_text,users.name,users.surname,users.id,post_comment.comment_text');
$this->db->join('post_shared', 'post_shared.id_post = post_user.id_post_shared');
$this->db->join('users','users.id = post_user.user_id');
$this->db->join('post_comment ','users.id = post_comment .id_user','LEFT');
$this->db->where('post_user.user_id',$user_id);
$this->db->order_by('post_user.id_post_shared','DESC');
$this->db->limit($limit);
$query = $this->db->get('post_user');
third parameter in the call is to specify the type of join join('table','relation','join type')

Answer 3

Try this:
$sql = "SELECT a.*,b.id,b.name,b.surname,c.id_post_shared,c.user_id,d.id_post,d.post_text
FROM post_comment a, users_table b, post_user c,post_share d
WHERE b.id = c.user_id
AND b.id = $user_id
AND c.id_post_shared = d.id_post
AND d.id_post = a.id_post";
$result = $this->db->query($sql)->result_array();
echo $result[0]['comment_text'];