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-   -   Combine 2 parts of mysql, how? (https://vborg.vbsupport.ru/showthread.php?t=52381)

Dark Jim 04-30-2003 07:07 PM
Combine 2 parts of mysql, how?
 
I have this query in privatemessage.php:
PHP Code:
  $messages = $DB_site->query("SELECT
  privatemessage.*,
  IF(ISNULL(touser.username),'[Deleted User]',touser.username) AS tousername,
  IF(ISNULL(fromuser.username),'[Deleted User]',fromuser.username) AS fromusername,
  icon.title AS icontitle,icon.iconpath
  ".iif($iconavatarenabled,",iconavatar.iconavatarpath,NOT ISNULL(customiconavatar.iconavatardata) AS hascustomiconavatar,customiconavatar.dateline AS iconavatardateline","")."
  FROM privatemessage
  LEFT JOIN icon ON icon.iconid=privatemessage.iconid
  LEFT JOIN user AS touser ON (touser.userid=privatemessage.touserid)
  LEFT JOIN user AS fromuser ON (fromuser.userid=privatemessage.fromuserid)
  ".iif($iconavatarenabled && privatemessage.userid!=privatemessage.touserid,"LEFT JOIN iconavatar ON iconavatar.iconavatarid=touser.iconavatarid LEFT JOIN customiconavatar ON customiconavatar.userid=touser.userid","")."
  WHERE privatemessage.userid='$bbuserinfo[userid]'
  AND folderid='".intval($folderid)."'
  $ignoreusers
  $dateconds
  ORDER BY dateline DESC"); 
This part:
PHP Code:
  ".iif($iconavatarenabled && privatemessage.userid!=privatemessage.touserid,"LEFT JOIN iconavatar ON iconavatar.iconavatarid=touser.iconavatarid LEFT JOIN customiconavatar ON customiconavatar.userid=touser.userid","")." 
needs to somehow combined with:
PHP Code:
  ".iif($iconavatarenabled && privatemessage.userid!=privatemessage.fromuserid,"LEFT JOIN iconavatar ON iconavatar.iconavatarid=fromuser.iconavatarid LEFT JOIN customiconavatar ON customiconavatar.userid=fromuser.userid","")." 
How would I do that? I tried a few things and nothing worked. Seaching for "iif" on php.net and mysql.com didn't work. :(

filburt1 04-30-2003 08:02 PM
iif is in functions.php and is identical to the construct:
PHP Code:
$something = iif($condition, $truevalue, $falsevalue);
// same as:
$something = ($condition ? $truevalue : $falsevalue); 
Theoretically, though, the second one is slightly faster.


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