Hello Mauro,

There are several scripts available for performing database-backups. You can find more information for mysql here: http://dev.mysql.com/doc/mysql/en/Backup.html

Why re-invent the wheel? Hope this helps.


        Guus der Kinderen

Mauro Chojrin wrote:


  I'm developing a db application with php and I have this problem:

 I have a script for backup making which is very simple, it just goes
through the entire database creating a file which contains the sql
statements to re create the database. The first thing the script does y
increase the time limit based on a calculation over the total number of
records. Every time I ran the script it would time out. After some time
reviewing the code (First I thought it might be hanging in an infinite loop)
I realized the problem was with a particular big size table. There must be a
way to optimize the code, because when I backup the database through
phpMyAdmin it works just fine, even fast.

This the cycle that's crashing down:

$fields = mysql_list_fields($dPconfig['dbname'], $row[0]);
     $columns = mysql_num_fields($fields);

     $insertSQL = 'INSERT INTO `'.$row[0].'` VALUES (';

  // all data from table
  $result = mysql_query('SELECT * FROM '.$row[0]);

  while($tablerow = mysql_fetch_array($result))
   $output .= $insertSQL;
   for ($i = 0; $i < $columns; $i++)
    // remove all enters from the field-string. MySql stamement must be on
one line
    $value = str_replace("\r\n",'\n',$tablerow[$i]);
    // replace ' by \'
    $value = str_replace('\'',"\'",$value);
    $output .= '\''.$value.'\',';
   $output = substr($output,0,-1); // remove last comma
   $output .= ');' . "\r\n";
  } // while

  $output .= "\r\n";
  $output .= "\r\n";


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