Question

I am trying to extend the mysqli class to make a helper class that will abstract away some of the complexities. One of the main things I want to accomplish is to make use of prepared statements.

I don’t really know where to start, or how to handle input and output properly in one class. Another problem is that I am unable to output data as an array while using prepared statements.

I could really use a simple example to point me in the right direction.

Answer 1

Check out the implementation of Zend_Db, and in particular, Zend_Db_Select. In fact, you might just opt to use that instead of developing your own. Examples:

 //connect to a database using the mysqli adapter
 //for list of other supported adapters see
 //http://framework.zend.com/manual/en/zend.db.html#zend.db.adapter.adapter-notes
$parameters = array(
                    'host'     => 'xx.xxx.xxx.xxx',
                    'username' => 'test',
                    'password' => 'test',
                    'dbname'   => 'test'
                   );
try {
    $db = Zend_Db::factory('mysqli', $parameters);
    $db->getConnection();
} catch (Zend_Db_Adapter_Exception $e) {
    echo $e->getMessage();
    die('Could not connect to database.');
} catch (Zend_Exception $e) {
    echo $e->getMessage();
    die('Could not connect to database.');
}

//a prepared statement
$sql = 'SELECT * FROM blah WHERE id = ?';
$result = $db->fetchAll($sql, 2);

//example using Zend_Db_Select
$select = $db->select()
             ->from('blah')
             ->where('id = ?',5);
print_r($select->__toString());
$result = $db->fetchAll($select);

//inserting a record
$row = array('name' => 'foo',
             'created' => time()
            );
$db->insert('blah',$row);
$lastInsertId = $db->lastInsertId();

//updating a row
$data = array(
    'name'      => 'bar',
    'updated'   => time()
);

$rowsAffected = $db->update('blah', $data, 'id = 2');