While loop update using php mysql

Im trying to update two records stored in a table, im trying to get the while loop to update assigned and agent_id fields - unfortunately it updates all the records in the database with the same $agent_id variable value.

Would love some advice :)
<?php 
 
$i = 1;
 
$facebook = 2;
 
 
$agent_id = 3;
 
 
if ( $facebook >= 1) {
 
while ( $i <= $facebook) {
 
 
// Update current DB
    $sql_update = "UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id'  WHERE agent_id = '75'";
    mysql_query($sql_update) or die(mysql_error());
		
 $i++; 
 
} 
 
}
 
?>

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agulaidAsked:
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mahomeCommented:
I dont't know what you exactly want to do but you only have the agent_id in the where clause. I think you also need the i or any second parameter you want.
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agulaidAuthor Commented:
UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id'  WHERE agent_id = '75'"
UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id'
  WHERE agent_id = '75'
"

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agulaidAuthor Commented:
the agent_id is before WHERE clause also.
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mahomeCommented:
??? That is the same query as above ???

What attributes do the two rows have you want to update?
You are always updating all rows that match the where clause, in your case all with agent_id = 75.
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agulaidAuthor Commented:
I would like to limit the updates to the value of $facebook, in this case only update 2 records in the database with an agent_id of 3.
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mahomeCommented:
>> limit the updates to the value of $facebook
which colum stores the facebook value?

You need something like this

$sql_update = 
"UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id' " . 
" WHERE agent_id = '75' and anotherColumn= '$i'";

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kingofninesCommented:
"only update 2 records in the database with an agent_id of 3."

Then your where clause needs to reflect that by limiting to records with agent_id = '3'. Not 75...

$sql_update = "UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id'  WHERE agent_id = '3'";



Alan
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kingofninesCommented:
Wait, why are you assigning $agent_id to 3 before the query is executed? On one hand you are saying you want only records with agent_id = 3 to be updated. Then on the other hand you are hard coding $agent_id to 3 which causes all records to be updated. I'm not sure what you need at this point.


Alan
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agulaidAuthor Commented:
I've managed to resolve it thanks:



$facebook = 2;
 
 
$agent_id = 5;
 
 
if ( $facebook >= 1) {
 
$i = 1;
 
while ( $i <= $facebook) {
 
 
// Update current DB
    $sql_update = "UPDATE facebook_user SET assigned = '1', agent_id = '$agent_id'  WHERE agent_id = '3'";
    $run_query = mysql_query($sql_update) or die(mysql_error());
		
 $i++; 
 
} 
 
}

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kingofninesCommented:
your query is not fixed. By setting $agent_id = 5 and then saying $agent_id = 3 in the where clause, no records will ever be updated.
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