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error check - mysql - php

Posted on 2007-11-16
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Last Modified: 2013-12-13
What's the best way to do an error check to see if the user ID exists?  if it doesn't exist, come back with "this user ID doesn't exist, try again".

ideas?  suggestions?

//GET ID # FROM USERS TABLE
$getIDsql = "select id from users where user_login = '$username'";
$getIDquery = mysql_query($getIDsql) or die ("Error in query: $getIDsql. ".mysql_error());
$getIDresult =  mysql_result($getIDquery, 0, 'id');
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Question by:bschwarting
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4 Comments
 
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 20298635
use the mysql_num_rows() function:
//GET ID # FROM USERS TABLE
$getIDsql = "select id from users where user_login = '$username'";
$getIDquery = mysql_query($getIDsql) or die ("Error in query: $getIDsql. ".mysql_error());
if (mysql_num_rows($getIDquery) == 0)
{
  echo "this user ID doesn't exist, try again.";
}
else
{
   $getIDresult =  mysql_result($getIDquery, 0, 'id');
    ...
 }

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Author Comment

by:bschwarting
ID: 20298782
I also need to set my variable $getIDresult to 1 if there isn't a result, how can i add this?

if (mysql_num_rows($getIDquery) == 0)
{
  echo "this user ID doesn't exist, try again.";
  $getIDresult = '1';
}

This doesn't seem to work.
0
 
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Author Comment

by:bschwarting
ID: 20298935
oops, had the wrong variable. and another piece of bad code.  that fixed it!
if (mysql_num_rows($getIDquerycompare) == 0)
{
  echo "this user ID doesn't exist, try again.";
  $getIDresultcompare = '1';
}

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 20298938
>This doesn't seem to work.
in how far? the code looks fine...
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