如何从php中获取数据库中的所有数据

Question

Here is my code:

<?php

/*** mysql hostname ***/
$hostname = 'localhost';

/*** mysql username ***/
$username = 'root';

/*** mysql password ***/
$password = '';

try {
    $dbh = new PDO("mysql:host=$hostname;dbname=sample", $username, $password);
    /*** echo a message saying we have connected ***/
    echo 'Connected to database <br />';

$sql = "SELECT * FROM sampletable";

$stmt = $dbh->query($sql);
$result = $stmt->fetch(PDO::FETCH_ASSOC);

foreach($result as $key =>$val){

echo $key. '-' .$val.'<br />';

}
$dbh = null;

    }
catch(PDOException $e)
    {
    echo $e->getMessage();
    }
?>

Now i am learning php, I want know about pdo connection to insert,update fetch data from database. I referred this link http://www.phpro.org/tutorials/Introduction-to-PHP-PDO.html#7.1

Now i got first column value.. May i know how to fetch all the records from database?

Thanks in advance.

Answer 1

You could just use ->fetchAll() method with this:

$result = $stmt->fetchAll(PDO::FETCH_ASSOC); // returns all rows
foreach($result as $key => $row) {
    echo $row['id'] . ' - ' . $row['column_name'] . '<br/>';
                     // ^ name of the column, this returns a multi dimensional
}

Sidenote: Its still an array inside, so you need to access the index of that copy inside the foreach.

Or also like this:

while($row = $result->fetch(PDO::FETCH_ASSOC)) {
    echo $row['id'] . ' - ' . $row['col1'] . '<br/>';
}