Question

Scenario:

I am exporting a table Named “Registration” from access database and writing into a file named “isl.txt” in php using pdo. Fields separated by “,” and Records separated by “\\”(i know it should be “\n” for convenience but it cant take a new line in text file. Don’t know why !! so i have chosen “\\”)

Registration Table in Access:

Roll_Num,Course,Marks,Discipline,Session

0,CS-101,89,CS,Fall94

0,CS-102,70,CS,Fall94

0,CS-103,59,CS,Fall94

Code:

$fl = fopen('isl.txt', 'w');
$db = new PDO("odbc:DRIVER={Microsoft Access Driver (*.mdb)};DBQ=D:\Islamabad.mdb;Uid=;Pwd=;");
$results = $db->query("select * from `Registration`");

while ($row = $results->fetch()) {

foreach ($row as $value) {
   $lastv = end($row);

    if ($value != $lastv){

        fwrite($fl, $value.",");
        }

}
 fwrite($fl, $value."\\");
}
 fclose($fl);

Output:

0,0,CS-101,CS-101,89,89,CS,CS,Fall94\0,0,CS-102,CS-102,70,70,CS,CS,Fall94\0,0,CS-103,CS-103,59,59,CS,CS,Fall94

Problem:

As u see, every single value of record is repeating two times. Please Check whats wrong with my code!!

Answer 1

The repeating values are because you are not specifying a fetch_style in $results->fetch([fetch_style]). According to the manual – http://php.net/manual/en/pdostatement.fetch.php – when fetch_style is not specified, it defaults to value of PDO::ATTR_DEFAULT_FETCH_MODE (which defaults to PDO::FETCH_BOTH).

PDO::FETCH_BOTH (default): returns an array indexed by both column
name and 0-indexed column number as returned in your result set

Try changing to –

while ($row = $results->fetch(PDO::FETCH_ASSOC)) {

OR

while ($row = $results->fetch(PDO::FETCH_NUM)) {