Question

I have a huge table from one mysql db, I want to create a new table in different mysql db and copy 3 columns from the huge one. To do that, I wrote the following code:

$result = mysql_query("SELECT * FROM huge_table", $hugeDB);
    $count = mysql_result($result, 0);
    $iterations=ceil($count/500);    

    for($i=1; $i<=$iterations; $i++)
    {
        $start = ($i-1)*500;
        $query = mysql_query("SELECT col1, col3, col6 FROM huge_table LIMIT $i, 500", $hugeDB);
        $results = array();
        $j = 0;
        while($result = mysql_fetch_array($query)) {
            $result[$j]= '('.$result['col1'].', '.$result['col3'].', '.$result['col6'].')';
            $j++;
        }
        print_r($results);
        $a = mysql_query("INSERT INTO less_huge_table (col1, col3, col6) VALUES ".implode(',', $results), $localDB);
        if(!$a) die(mysql_error()."\n");
    }

But then the output is:

Unknown column 'BTFG' in 'field list'

Where BTFG is the array’s first element’s item:

(2007-01-03, BTFG, 23.0481)

I think I’m making a little mistake but I couldn’t catch.

How should I solve this problem ?

Thanks

Answer 1

Your array is $result not $resullts. You declared array with $results then assigned values in $result and in insert you are using $results which is blank.

it should be

  while($result = mysql_fetch_array($query)) {
   $results[$j]= '("'.$result['col1'].'", "'.$result['col3'].'", "'.$result['col6'].'")';
   ....
   }

BTW what is $j++ not used anywhere else.

EDIT:

quote char and string values properly:

('2007-01-03', 'BTFG', 23.0481)

change here :

 $results[$j]= '("'.$result['col1'].'", "'.$result['col3'].'", "'.$result['col6'].'")';