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PHP / MySQL Update only changed fieds

Posted on 2010-08-13
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Last Modified: 2013-12-13
How can I make this so that it only updates the fields that have changed? For instance if someone gets a new phone number or email address.

Thank you
$Car_Number = $_POST['Car_Number'];
$Driver_Name=$_POST['Driver_Name'];
$Home_Town=$_POST['Home_Town'];
$Cartoon_Character=$_POST['Cartoon_Character'];
$Highlights=$_POST['Highlights'];
$Email=$_POST['Email'];
$Phone=$_POST['Phone'];

$newname = $Car_Number.".JPG";
$foldername = "CarPics";
$Picture = '<img src="'.$foldername."/".$newname. '" width="260" height="195">';
move_uploaded_file($_FILES['mailfile']['tmp_name'], "../$foldername/$newname");
chmod ("../$foldername/$newname", 0644);

$sql = mysql_query("UPDATE Roster SET `Image` = `$Picture`, `Driver_Name` = '$Driver_Name',
        `Home_Town` = '$Home_Town', `Cartoon_Character` = '$Cartoon_Character', `Highlights` = '$Highlights',
        `Email` = '$Email', `Phone` = '$Phone' WHERE `Car_Number` = '$Car_Number'") or die(mysql_error());

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Question by:patrickm12981
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6 Comments
 
LVL 3

Expert Comment

by:dockhand
ID: 33434245
I would create some variables to save the original values when you read the customer info and then create your "$sql" statement dynamically.  Something like:

$sql = 'mysql_query("UPDATE Roster SET `Image` = `$Picture`'
If $Origanal_Driver_Name != $Drive_Name {
   $sql &=  "`Driver_Name` = '$Driver_Name'"
}

etc.
0
 
LVL 2

Expert Comment

by:binghu
ID: 33434524
UPDATE Roster
SET Image = `$Picture`'
WHERE `Car_Number` = '$Car_Number'
and image != `$Picture`
0
 
LVL 8

Expert Comment

by:ropenner
ID: 33434695
The only way I can see that updating a field could be a problem is if your form you are submitting doesn't have the same values (blank perhaps) as in the database ... if that is the case you need to check each variable if it is empty first.

IF CHECKING for BLANK VALUES

foreach (array('Car_Number','Driver_Name','Home_Town','Cartoon_Character','Highlights','Email','Phone') as $field) {
      if ($_POST[$field]) { # checks if it has a value
            $sql = mysql_query("UPDATE Roster SET $field='$_POST[$field]'");
      }
}

OR


IF THE same values are in the input variables ... it doesn't matter because the database will look the same whether the update is done or not.  You don't save any time because to check each value if it has changed you'd have to do a query to fetch the current values.
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LVL 8

Accepted Solution

by:
ropenner earned 2000 total points
ID: 33434700
oops error in syntax.

foreach (array('Car_Number','Driver_Name','Home_Town','Cartoon_Character','Highlights','Email','Phone') as $field) {
      if ($_POST[$field]) { # checks if it has a value
            $sql = mysql_query("UPDATE Roster SET $field='".$_POST[$field]."'");
      }
}
0
 

Author Comment

by:patrickm12981
ID: 33435066
ropenner - thank you - How does the where statement fit into that?
0
 
LVL 8

Assisted Solution

by:ropenner
ropenner earned 2000 total points
ID: 33435117
oops....
mysql_query("UPDATE Roster SET $field={$_POST[$field]} WHERE `Car_Number` = '$Car_Number'");
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