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Update database without get actual contain

Posted on 2009-06-28
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Last Modified: 2012-05-07
Hi E's, in one field of my mysql database, I have this format nn nn nn, in practice like this, 05 44 99, 2 numeric, space, 2 numeric, space, 2 numeric.
Every time I have a value that was more bigger then one of the values in database, I need to upgrade the database (ex. If I have the new value '55', I need to remove 05 and return for the first place the number '44', becomes 44 55 99).

I can do that in this way:
call database
explode string to get 3 arrays
verify if new value is more bigger then the low number in database, if yes replace and restructure all array
implode the array to string
update database

This is the best way to do this?
Have any simple way to do this?

Regards, JC
 
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Question by:Pedro Chagas
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3 Comments
 
LVL 39

Expert Comment

by:Roger Baklund
ID: 24732529
Try the code below. You must change the name of the posted value ("New_number"), the table name, the column name and insert a WHERE condition.
$res = mysql_query('select Col from TableName where ...');
if(!$res) die(mysql_error());
$value = mysql_result($res,0);
$numbers = explode(' ',$value);
$new_number = (int) $_POST['New_number'];  # fetch new number
if(strlen($new_number)<2)        # if less than two digits...
  $new_number = '0'.$new_number; # ...prefix with a 0 
$numbers[] = $new_number;
sort($numbers);
while(count($numbers) > 3)  # if more than 3 numbers
  array_shift($numbers);    # remove smallest number
$new_value = implode(' ',$numbers);
$res = mysql_query("update TableName set Col='$new_value' where ...");
if(!$res) die(mysql_error());

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Author Comment

by:Pedro Chagas
ID: 24732662
Hi @cxr, thanks for your feedback.
Something don't work in your solution, and I thing it's a simple thing.
In your solution the first numbers never change, it's allways 00, and just change the third numbers, like 00 20 60, if the new value is 90, becomes 00 20 90, when the correct is 20 60 90.

Note: before the first update, the string have this number and format in database 00 00 00 (maybe this information was important)

I put my code in snippet code for you check and maybe change something.
relevant changes:
$existek->tres_pontos; //the variable that contain the string
$valor //is the variable that contain the number to check, like 44 or other

What is wrong in the code?

Regards, JC
        $value = $existek->tres_pontos;
	$numbers = explode(' ',$value);
	$new_number = $valor;  # fetch new number
	if(strlen($new_number)<2)        # if less than two digits...
  	$new_number = '0'.$new_number; # ...prefix with a 0 
	$numbers[] = $new_number;
	sort($numbers);
	while(count($numbers) > 3)  # if more than 3 numbers
  	array_shift($numbers);    # remove smallest number
	$new_value = implode(' ',$numbers);
	echo "<br>NEW $new_value";

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Accepted Solution

by:
Roger Baklund earned 2000 total points
ID: 24732698
The error must be somewhere else, this seems to work:
        $value = "00 20 60";
        $numbers = explode(' ',$value);
        $new_number = 90;
        if(strlen($new_number)<2)        # if less than two digits...
        $new_number = '0'.$new_number; # ...prefix with a 0 
        $numbers[] = $new_number;
        sort($numbers);
        while(count($numbers) > 3)  # if more than 3 numbers
        array_shift($numbers);    # remove smallest number
        $new_value = implode(' ',$numbers);
        echo "<br>NEW $new_value";
 
# output: NEW 20 60 90

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