Get Last Executed Query in PHP PDO - php

Question

I would like to know what query is executed using PHP PDO. I have:
<?php
try {
$DBH = new PDO("mysql:host=localhost;dbname=mytable", 'myuser', 'mypass');
}
catch(PDOException $e) {
echo $e->getMessage();
}
$DBH->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING );
$DBH->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$STH = $DBH->("INSERT INTO mytable (column1, column2, column3 /* etc...*/) value (:column1, :column2, :column3 /* etc...*/)");
$STH->bindParam(':column1', $column1);
$STH->bindParam(':column2', $column2);
$STH->bindParam(':column3', $column3);
/* etc...*/
$STH->execute();
// what is my query?
I would like to get something like:
INSERT INTO mytable (column1, column2, column3) value ('my first column', 32, 'some text')
Is it possible? Thanks

Answer 1

<?php
class MyPDOStatement extends PDOStatement
{
protected $_debugValues = null;
protected function __construct()
{
// need this empty construct()!
}
public function execute($values=array())
{
$this->_debugValues = $values;
try {
$t = parent::execute($values);
// maybe do some logging here?
} catch (PDOException $e) {
// maybe do some logging here?
throw $e;
}
return $t;
}
public function _debugQuery($replaced=true)
{
$q = $this->queryString;
if (!$replaced) {
return $q;
}
return preg_replace_callback('/:([0-9a-z_]+)/i', array($this, '_debugReplace'), $q);
}
protected function _debugReplace($m)
{
$v = $this->_debugValues[$m[1]];
if ($v === null) {
return "NULL";
}
if (!is_numeric($v)) {
$v = str_replace("'", "''", $v);
}
return "'". $v ."'";
}
}
// have a look at http://www.php.net/manual/en/pdo.constants.php
$options = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_STATEMENT_CLASS => array('MyPDOStatement', array()),
);
// create PDO with custom PDOStatement class
$pdo = new PDO($dsn, $username, $password, $options);
// prepare a query
$query = $pdo->prepare("INSERT INTO mytable (column1, column2, column3)
VALUES (:col1, :col2, :col3)");
// execute the prepared statement
$query->execute(array(
'col1' => "hello world",
'col2' => 47.11,
'col3' => null,
));
// output the query and the query with values inserted
var_dump( $query->queryString, $query->_debugQuery() );

Answer 2

Most people create a wrapper class around the PDO object to record the queries as they are sent to the database. Hardly anyone uses a direct PDO object since you can add extra helper methods by wrapping, or extending PDO.
/**
* Run a SQL query and return the statement object
*
* #param string $sql query to run
* #param array $params the prepared query params
* #return PDOStatement
*/
public function query($sql, array $params = NULL)
{
$statement = $this->pdo->prepare($sql);
$statement->execute($params);
// Save query results by database type
self::$queries[] = $sql;
return $statement;
}