PDO Read From Database - php

Question

I have made a code using PDO to read a table from a database.
I try to echo my result but I get a blank page without error.
My Code Is:
<?php
include 'config.php';
id = "264540733647332";
try {
$conn = new PDO("mysql:host=$hostname;dbname=mydata", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
$result = $conn->query("SELECT * FROM mytable WHERE id='".$id."';");
if ($result->fetchColumn() != 0)
{
foreach ( $result->fetchAll(PDO::FETCH_BOTH) as $row ) {
$Data1 = $row['Data1'];
$Data2 = $row['Data2'];
echo $Data2;
}
}
?>
But the echo is empty without any error.
What I am doing wrong?
Thank you All!

Answer 1

Few things to change:
dont forget $
if your going to catch the error, catch the whole pdo code
You can use rowCount() to count the rows
echo something if the record count is 0
include 'config.php';
$id = "264540733647332";
try {
$conn = new PDO("mysql:host=$hostname;dbname=mydata", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$result = $conn->query("SELECT * FROM mytable WHERE id='".$id."';");
if ($result->rowCount() != 0)
{
$row = $result->fetch(PDO::FETCH_BOTH);
echo $row['Data1'];
echo $row['Data2'];
}else{
echo 'no row found';
}
}catch(PDOException $e){
echo "error " . $e->getMessage();
}
Also use prepared statements for example:
$result = $conn->prepare("SELECT * FROM mytable WHERE id=:id");
$result->execute(array(':id'=>$id));

Answer 2

I'm assuming there's only one record with the id "264540733647332".
The issue is that $result->fetchColumn() call reads first row in the result set and then advances to the next result. Since there's only one of the results, the subsequent call to $result->fetchAll() returns nothing, hence no data displayed.
To fix this replace fetchColumn with rowCount:
<?php
include 'config.php';
id = "264540733647332";
try {
$conn = new PDO("mysql:host=$hostname;dbname=mydata", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
$result = $conn->query("SELECT * FROM mytable WHERE id='".$id."';");
if ($result->fetchColumn() != 0)
{
foreach ( $result->fetchAll(PDO::FETCH_BOTH) as $row ) {
$Data1 = $row['Data1'];
$Data2 = $row['Data2'];
echo $Data2;
}
}
?>