CODEWITHSUNDEEP
phpmysql
malifa
malifa

Reputation: 8165

Read through huge text files and store each line in database

I wrote a PHP script which runs through a text file (actually it's a 'list' file from imdb) and stores it on my local MySQL database.

public static function updateMovies( $list ) {
    $offset = 15;               // movies.list start with movie names at line 16
    $handle = fopen($list, "r") or die("Couldn't get handle");
    if ($handle) {
        while (!feof($handle)) {
            $buffer = fgets($handle);
            if($offset!=0)
                $offset--;
            else
                if($buffer[0] != '"'){
                    $title = trim( substr( $buffer, 0, strpos( $buffer, '(' ) ) );
                    $year = intval(trim( substr( $buffer, strpos( $buffer,'(' )+1, 4 ) ));
                    Movie::create( $title, $year );
                }
        }
        fclose($handle);
    }
}

Since those list-files are up to 200MB it takes a lot of time. By Default PHP's MAX_EXECUTION_TIME is set to 30 seconds.

I set this value to 300 just to try if it works. For example, my 'movies.list' file is around 80MB and using this script for 300 seconds created around 25000 lines in my database. This doesn't work because I have not even reached the movies starting with 'B'.

I know I can set the MAX_EXECUTION_TIME to 0 (unlimited) but in the future I don't want this database to be on my localhost. I want it on my webserver and my webserver hosts MAX_EXECUTION_TIME is set to 90 as far as I know.

Any ideas how you would handle this?

Upvotes: 1

Views: 1606

Answers (2)

Baba
Baba

Reputation: 95161

I don't think its a goo idea for you to load such kind of large file directly to your database ... especially when it takes so long to conclude

My Advice

Split the files to smaller chunks locally .. then on the remote server upload it to your database

Example (Documentation : http://en.wikipedia.org/wiki/Split_%28Unix%29 ) 

 exec('split -d -b 2048m ' . $list . ' chunks');

For a pure PHP implementation see

http://www.php.happycodings.com/File_Manipulation/code50.html

Or 

define('CHUNK_SIZE', 1024*1024);
function readfile_chunked($filename, $retbytes = TRUE) {
    $buffer = '';
    $cnt =0;
    // $handle = fopen($filename, 'rb');
    $handle = fopen($filename, 'rb');
    if ($handle === false) {
      return false;
    }
    while (!feof($handle)) {
      $buffer = fread($handle, CHUNK_SIZE);
      echo $buffer;
      ob_flush();
      flush();
      if ($retbytes) {
        $cnt += strlen($buffer);
      }
    }
    $status = fclose($handle);
    if ($retbytes && $status) {
      return $cnt; // return num. bytes delivered like readfile() does.
    }
    return $status;
  }

Upvotes: 1

sivann
sivann

Reputation: 2141

You may either: Use set_time_limit(sec) or (better) run your script from the command line through a cron entry. That way you will avoid many other non-php related timeout issues.

Upvotes: 1

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