PDO bindParam() with prepared statement isn't working - php

Question

Ok, this is the problem:
This works:
$STH = $DBH->prepare("SELECT * FROM juegos WHERE id = 1");
$STH->execute();
This doesn't:
$STH = $DBH->prepare("SELECT * FROM juegos WHERE id = :id");
$STH->bindParam(':id', '1', PDO::PARAM_STR);
$STH->execute();
What in the world am I doing wrong? It doesn't even throw an exception
Thank you everyone!
Also, this is the whole code
<?php
try {
$DBH = new PDO("everything is", "ok", "here");
$DBH->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$STH = $DBH->prepare("SELECT * FROM juegos WHERE id = :id");
$STH->bindParam(':id', '1', PDO::PARAM_STR);
$STH->execute();
$STH->setFetchMode(PDO::FETCH_ASSOC);
while($row = $STH->fetch()) {
echo $row['nombre']."<br/>";
}
$DBH = null;
echo "Todo salió bien";
} catch (PDOException $e) {
echo "Error";
}
?>

Answer 1

Using bindParam() the variable is bound as a reference.
A string can't be passed by reference.
The following things can be passed by reference:
Variables, i.e. foo($a)
New statements, i.e. foo(new foobar())
References returned from functions
Try using bindValue()
$STH->bindValue(':id', '1', PDO::PARAM_STR);

Answer 2

PHP bindParam() binds a PHP variable to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement.
The correct way to use bindParam is:
$id = 1;
$sth = $DBH->prepare("SELECT * FROM juegos WHERE id = :id");
$sth->bindParam(':id', $id, PDO::PARAM_INT);// use bindParam to bind the variable
// ^ PDO::PARAM_INT - the value of the variable $id should be an int
// ^ $id - the variable being represented by ':id',
// ^ :id - represents the variable
// $id - the variable being represented by ':id',
PHP bindValue() binds a value to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement.
$id=10;
$name=roadkill;
$sth = $dbh->prepare('SELECT *
FROM juegos
WHERE id < :id AND name = :name');
$sth->bindValue(':id', $id, PDO::PARAM_INT);// use bindValue to bind the variable's value
$sth->bindValue(':name', $name, PDO::PARAM_STR);// use bindValue to bind the variable's value
The key difference between these two methods is that unlike PDOStatement::bindValue(), with bindParam() the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

Answer 3

The value for the :tabla parameter will be automatically quoted and escaped by PDO. The query executed would become:
SELECT * FROM 'juegos'
which is not valid SQL.

Answer 4

do not pass the value directly to BindParam.
try {
// $DBH = new PDO("everything is", "ok", "here");
$DBH = new PDO("mysql:host=localhost;dbname=test", 'root', '');
$DBH->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$STH = $DBH->prepare("SELECT * FROM statstracker WHERE SrNo = :id");
$id = 1; // here you should keep it as variable and pass it to param
$STH->bindParam(':id', $id, PDO::PARAM_STR);
$STH->execute();
$STH->setFetchMode(PDO::FETCH_ASSOC);
while($row = $STH->fetch()) {
echo $row['SrNo']."<br/>";
}
$DBH = null;
echo "Todo salió bien";
} catch (PDOException $e) {
echo "Error";
}

Answer 5

For me replacing the double quote by single quote fixed the issue.
Previous:
$STH = $DBH->prepare("SELECT * FROM statstracker WHERE SrNo = :id");
Solution:
$STH = $DBH->prepare('SELECT * FROM statstracker WHERE SrNo = :id');
And it works, though not sure why.
Hope it helps!