mysql - avoid duplicate values in php -


i have created "people may know" script in php. script shows me friends of friends, in php friend system. have table called users (user_id, name, surname, email, profile) thats holds information users. table called friends(friend_id, user_one, user_two) holds id of users friends. code following:

<?php   // ------ gives me friends    $friend_query = mysql_query("  select `user_one`, `user_two` `friends` `user_one`='$session_user_id' or `user_two`='$session_user_id' ");      while($run_friend = mysql_fetch_array($friend_query)){     $user_one = $run_friend['user_one'];     $user_two = $run_friend['user_two'];      if($user_one == $session_user_id){       $user = $user_two;     } else {       $user = $user_one;     }      $friend_id = getuser($user, 'user_id');       // ----- gives me friends of friends     $friend_query_two = mysql_query("  select `user_one`, `user_two` `friends` (`user_one`='$friend_id' , `user_two` != '$session_user_id') or (`user_one`!='$session_user_id' , `user_two`='$friend_id' )  ");        while($run_friend_two = mysql_fetch_array($friend_query_two)){                                 $user_one_two = $run_friend_two['user_one'];       $user_two_two = $run_friend_two['user_two'];        if($user_one_two == $friend_id){         $user_two = $user_two_two;       } else {         $user_two = $user_one_two;       }        $friend_id_two = getuser($user_two, 'user_id');       // ------- gives me friends of friends friends        $check_friend_query = mysql_query("  select friends_id friends  (user_one='$session_user_id' , user_two='$friend_id_two') or (user_one='$friend_id_two' , user_two='$session_user_id')  ");        if (mysql_num_rows($check_friend_query) != 1){          //here problem duplicate values friends of friends          $my_friend = $friend_id_two;         $friends_friends = mysql_query("select `user_id`, `name`, `surname`, `email`, `profile` `users` (`user_id`='$my_friend')  ");          while ($run_friends= mysql_fetch_assoc($friends_friends)) {           $friend_user_id = $run_friends['user_id'];         } ?>

my code works fine , gives me friends of friends. problem duplicate values. idea how avoid this?

updated

a php implementation might this:

global $db; $db = new pdo('mysql:host=localhost;dbname=<somedb>', '<username>', 'password');  $friends = getfriendsof( $session_user_id ); $friends_of_friends = getfriendsof( $friends );  // whatever want right here // friends ($friends) // , friends' friends ($friends_of_friends)  function getfriendsof( $user ) {     global $db;      if ( is_array( $user ) ) $where = ' in (' . implode( ',', $user ) . ')';     else $where = ' = ' . $user;      $sql = " select group_concat( f.user_id ) friends   (select user_one user_id           friends          user_two {$where}          union distinct         select user_two           friends          user_one {$where}        ) f";      $results = $db->query( $sql );     $row = $results->fetch();     return explode( ',', $row[ 'friends' ] ); }

original

don't have data test with. should trick.

get friends:

select u.*   (select user_one user_id           friends          user_two = '$session_user_id'          union distinct         select user_two           friends          user_one = '$session_user_id'        ) f   join users u     on u.user_id = f.user_id

get friends of friends:

select u.*   (select distinct user_one user_id           friends          user_two in (select user_one user_id                               friends                              user_two = '$session_user_id'                              union distinct                             select user_two                               friends                              user_one = '$session_user_id'                            )          union distinct         select distinct user_two           friends          user_one in (select user_one user_id                               friends                              user_two = '$session_user_id'                              union distinct                             select user_two                               friends                              user_one = '$session_user_id'                            )        ) f   join users u     on u.user_id = f.user_id

Comments

Post a Comment

Popular posts from this blog

How to remove text and logo OR add Overflow on Android ActionBar using AppCompat on API 8? -

have researched death , cannot find answer. i have actionbar using appcompat. supporting api v7 (api v8 do). actionbar works api v11. api < v11 has problem of removing icon (and feature) actionbar without supplying overflow. big picture have app logo, app title, , 3 icons squidging same actionbar on low end phone. trying make room! i happy 1 of 2 solutions. either: a method of getting overflow functionality can retrieved pull down. (preferred) method of removing icon , text actionbar below current xml api 11+: <resources> <!-- base application theme api 11+. theme replaces appbasetheme res/values/styles.xml on api 11+ devices. --> <style name="appbasetheme" parent="theme.appcompat.light.darkactionbar"> <item name="android:actionbarstyle">@style/liteactionbarstyle</item> <item name="actionbarstyle">@style/liteactionbarstyle</item> </st...
Read more

html - How to style widget with post count different than without post count -

i have border below li elements in wordpress widget types appropriate. element inside set block gives them nice easy click full width. the problem, when choose option "show post count" when adding widget such categories or archives displays post count plain text after tag , because tag block pushes post number text line below. whether choose show post count or not show post count still gives exact same element identifyer example "widget_categories". how style post count not on next line still keep links non post count list items full width? here's example on sidebar www.bbmthemes.com/themes/modular/blog-standard/ in order solve problem need remove display:block; for ul.widgets ul a , add in it's place line-height: 33px; what going achieve have same visual effect. what going lose doing links going work on text , not on "box". the other way out of find post count coming , make changes this. example change text count i...
Read more

url rewriting - How to redirect a http POST with urlrewritefilter -

i have question urlrewritefilter , until not find in net. i want redirect http post in tomcat7. here example... the call http post ulr http://localhost:8080/oldapplication/example?a=123&b=2 this call contains content either xml or json. filter configured works , urlrewrite.xml contains: <?xml version="1.0" encoding="utf-8"?> <!doctype urlrewrite public "-//tuckey.org//dtd urlrewrite 4.0//en" "http://www.tuckey.org/res/dtds/urlrewrite4.0.dtd"> <urlrewrite use-query-string="true"> <rule> <condition type="method">post</condition> <from>^(.*)$</from> <to type="redirect">/newapplication$1</to> </rule> </urlrewrite> in access log can see call http://localhost:8080/oldapplication/example?a=123&b=2 gets redirected http://localhost:8080/newapplication/example?a=123&b=2 fine until now. pr...
Read more