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    User Contributed Notes 5 notes

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    124
    djlopez at gmx dot de
    18 years ago
    Please note this:

    Won't work:
    $sth = $dbh->prepare('SELECT name, colour, calories FROM ? WHERE calories < ?');

    THIS WORKS!
    $sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < ?');

    The parameter cannot be applied on table names!!
    up
    6
    wiserufferto at gmail dot com
    3 years ago
    This is a little late... but I'm old and slow.......
    Regarding Extending PDOStatement and PDO I found that sending the PDOExtended class by reference helps:
    In the constructor after parent::__construct() :
    $this->setAttribute(\PDO::ATTR_STATEMENT_CLASS,array('PDOStatementExtended', [&$this]));}

    And in
    class PDOStatementExtended extends \PDOStatement
    {

    protected function __construct
    (
    \PDO &$PDO,
    )
    up
    10
    pokojny at radlight dot com
    18 years ago
    I wanted to extend PDO class to store statistics of DB usage, and I faced some problems. I wanted to count number of created statements and number of their executings. So PDOStatement should have link to PDO that created it and stores the statistical info. The problem was that I didn't knew how PDO creates PDOStatement (constructor parameters and so on), so I have created these two classes:

    <?php
    /**
    * PHP Document Object plus
    *
    * PHP Document Object plus is library with functionality of PDO, entirely written
    * in PHP, so that developer can easily extend it's classes with specific functionality,
    * such as providing database usage statistics implemented in v1.0b
    *
    * @author Peter Pokojny
    * @license http://opensource.org/licenses/gpl-license.php GNU Public License
    */
    class PDOp {
    protected     $PDO;
    public     $numExecutes;
    public     $numStatements;
    public function     __construct($dsn, $user=NULL, $pass=NULL, $driver_options=NULL) {
    $this->PDO = new PDO($dsn, $user, $pass, $driver_options);
    $this->numExecutes = 0;
    $this->numStatements = 0;
    }
    public function     __call($func, $args) {
    return     call_user_func_array(array(&$this->PDO, $func), $args);
    }
    public function     prepare() {
    $this->numStatements++;

    $args = func_get_args();
    $PDOS = call_user_func_array(array(&$this->PDO, 'prepare'), $args);

    return new     PDOpStatement($this, $PDOS);
    }
    public function     query() {
    $this->numExecutes++;
    $this->numStatements++;

    $args = func_get_args();
    $PDOS = call_user_func_array(array(&$this->PDO, 'query'), $args);

    return new     PDOpStatement($this, $PDOS);
    }
    public function     exec() {
    $this->numExecutes++;

    $args = func_get_args();
    return     call_user_func_array(array(&$this->PDO, 'exec'), $args);
    }
    }
    class     PDOpStatement implements IteratorAggregate {
    protected     $PDOS;
    protected     $PDOp;
    public function     __construct($PDOp, $PDOS) {
    $this->PDOp = $PDOp;
    $this->PDOS = $PDOS;
    }
    public function     __call($func, $args) {
    return     call_user_func_array(array(&$this->PDOS, $func), $args);
    }
    public function     bindColumn($column, &$param, $type=NULL) {
    if (    $type === NULL)
    $this->PDOS->bindColumn($column, $param);
    else
    $this->PDOS->bindColumn($column, $param, $type);
    }
    public function     bindParam($column, &$param, $type=NULL) {
    if (    $type === NULL)
    $this->PDOS->bindParam($column, $param);
    else
    $this->PDOS->bindParam($column, $param, $type);
    }
    public function     execute() {
    $this->PDOp->numExecutes++;
    $args = func_get_args();
    return     call_user_func_array(array(&$this->PDOS, 'execute'), $args);
    }
    public function     __get($property) {
    return     $this->PDOS->$property;
    }
    public function     getIterator() {
    return     $this->PDOS;
    }
    }
    ?>

    Classes have properties with original PDO and PDOStatement objects, which are providing the functionality to PDOp and PDOpStatement.
    From outside, PDOp and PDOpStatement look like PDO and PDOStatement, but also are providing wanted info.
    up
    0
    dougwilbourne at gmail dot com
    5 days ago
    Now that current versions of MySQL are forcing users to authenticate with caching_sha2_password instead of mysql_native_driver, I wanted to get PDO to send passwords that way. I think the only way to do it is to make the connection over SSL. Setting up your web server and database server for SSL is way beyond the scope of this note, but after you do, remember that you will need to add an options array as the last argument in your PDO connection arguments. At a minimum, you will need to supply the server certificate. In a development environment with a self-signed server certificate, you will also want to bypass verification that your server certificate is 'real'. So your options array would look like this

    $opts = [ PDO::MYSQL_ATTR_SSL_CA => $server_cert_file_path, PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false];

    Hope it helps!
    up
    -1
    www.navin.biz
    18 years ago
    Below is an example of extending PDO & PDOStatement classes:

    <?php

    class Database extends PDO
    {
    function     __construct()
    {
    parent::__construct('mysql:dbname=test;host=localhost', 'root', '');
    $this->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('DBStatement', array($this)));
    }
    }

    class     DBStatement extends PDOStatement
    {
    public     $dbh;

    protected function     __construct($dbh)
    {
    $this->dbh = $dbh;
    $this->setFetchMode(PDO::FETCH_OBJ);
    }

    public function     foundRows()
    {
    $rows = $this->dbh->prepare('SELECT found_rows() AS rows', array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE));
    $rows->execute();
    $rowsCount = $rows->fetch(PDO::FETCH_OBJ)->rows;
    $rows->closeCursor();
    return     $rowsCount;
    }
    }

    ?>
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