CODEWITHSUNDEEP
phpmysql
user1592953
user1592953

Reputation: 135

Using a MySQL query with PHP

I am creating a social network in which you can follow someone or be friends with them. The data you are able to see depends on the type of relationship you have with a user. Right now I have two tables to work with. Posts and Relationships.

Posts:

| user_id | post_id | story |
-----------------------------
|  1      |  1      | text. |
-----------------------------

Relationships:

| rel_id  | user_1  | user_2| status |
--------------------------------------
|  1      |  1      |   2   |    3   |
--------------------------------------

I also have a users table but I don't think that is important here. SO, basically I want to select all of the posts from users that I am friends with or following. User_2 is always the recipient of the relationship. The numbers 1, 2 and 3 represent the "status" of the relationship. 1 being you are following the recipient, 3 being you are friends, and 4 being you are following the recipient (the only difference is that you also have a pending friend request). I set up a SELECT QUERY but it is not working right.

$query=" SELECT * FROM posts LEFT JOIN relationships ON (posts.user_id=    
relationships.user_2 AND relationships.user_1 = $user_id AND relationships.status = 4 
OR 3 OR 1)";

It selects all the posts ever, twice. Why is that? I want it to only select the posts where the user posting the post is in a relationship with me, with a status of 1, 3, or 4. What might I be doing wrong? What are other ways to do this?

Thanks in advance!

Upvotes: 1

Views: 64

Answers (2)

John Woo
John Woo

Reputation: 263933

Your OR in the WHERE clause condition is not in the correct syntax. try something like this:

SELECT  * 
FROM    posts a 
            LEFT JOIN relationships b
                ON a.user_id = b.user_2 
WHERE   b.user_1 = $user_id AND 
        b.status IN (1,3,4)

I suggest that you use PDO or MYSQLi extensions.

In PDO, it could look like this:

<?php
$stmt = $dbh->prepare("SELECT   * 
                      FROM  posts a 
                           LEFT JOIN relationships b
                                ON a.user_id = b.user_2 
                     WHERE  b.user_1 = ? AND 
                            b.status IN (1,3,4)");

$stmt->bindParam(1, $user_id);
$stmt->execute();

?>

Remember to always filter your inputs especially it is used querying your database.

Upvotes: 0

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 799490

That's not how OR works. Perhaps you should try IN.

... relationships.status IN (4, 3, 1) ...

As for the duplication, use DISTINCT.

Upvotes: 2

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