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doctrine2/lib/Doctrine/Db.php

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<?php
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/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.com>.
*/
/**
* Doctrine_Db
* A thin wrapper layer on top of PDO / Doctrine_Adapter
*
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* Doctrine_Db provides the following things to underlying database hanlder
*
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* 1. Event listeners
* An easy to use, pluggable eventlistener architecture. Aspects such as
* logging, query profiling and caching can be easily implemented through
* the use of these listeners
*
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* 2. Lazy-connecting
* Creating an instance of Doctrine_Db does not connect
* to database. Connecting to database is only invoked when actually needed
* (for example when query() is being called)
*
* 3. Portable error codes
* Doctrine_Db_Exception drivers provide portable error code handling.
*
* 4. Easy-to-use fetching methods
* For convience Doctrine_Db provides methods such as fetchOne(), fetchAssoc() etc.
*
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @package Doctrine
* @category Object Relational Mapping
* @link www.phpdoctrine.com
* @since 1.0
* @version $Revision$
*/
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class Doctrine_Db implements Countable, IteratorAggregate, Doctrine_Adapter_Interface
{
/**
* @var array $instances all the instances of this class
*/
protected static $instances = array();
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/**
* @var array $isConnected whether or not a connection has been established
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*/
protected $isConnected = false;
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/**
* @var PDO $dbh the database handler
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*/
protected $dbh;
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/**
* @var array $options
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*/
protected $options = array('dsn' => null,
'username' => null,
'password' => null,
);
/**
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* @var Doctrine_Db_EventListener_Interface|Doctrine_Overloadable $listener
* listener for listening events
*/
protected $listener;
/**
* @var integer $querySequence
*/
protected $querySequence = 0;
private static $driverMap = array('oracle' => 'oci8',
'postgres' => 'pgsql',
'oci' => 'oci8',
'sqlite2' => 'sqlite',
'sqlite3' => 'sqlite');
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/**
* constructor
*
* @param string $dsn data source name
* @param string $user database username
* @param string $pass database password
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*/
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public function __construct($dsn, $user, $pass)
{
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if ( ! isset($user)) {
$a = self::parseDSN($dsn);
extract($a);
}
$this->options['dsn'] = $dsn;
$this->options['username'] = $user;
$this->options['password'] = $pass;
$this->listener = new Doctrine_Db_EventListener();
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}
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public function nextQuerySequence()
{
return ++$this->querySequence;
}
/**
* getQuerySequence
*/
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public function getQuerySequence()
{
return $this->querySequence;
}
/**
* getDBH
*/
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public function getDBH()
{
return $this->dbh;
}
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public function getOption($name)
{
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if ( ! array_key_exists($name, $this->options)) {
throw new Doctrine_Db_Exception('Unknown option ' . $name);
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}
return $this->options[$name];
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}
/**
* addListener
*
* @param Doctrine_Db_EventListener_Interface|Doctrine_Overloadable $listener
* @return Doctrine_Db
*/
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public function addListener($listener, $name = null)
{
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if ( ! ($this->listener instanceof Doctrine_Db_EventListener_Chain)) {
$this->listener = new Doctrine_Db_EventListener_Chain();
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}
$this->listener->add($listener, $name);
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return $this;
}
/**
* getListener
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*
* @return Doctrine_Db_EventListener_Interface|Doctrine_Overloadable
*/
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public function getListener()
{
return $this->listener;
}
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/**
* setListener
*
* @param Doctrine_Db_EventListener_Interface|Doctrine_Overloadable $listener
* @return Doctrine_Db
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*/
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public function setListener($listener)
{
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if ( ! ($listener instanceof Doctrine_Db_EventListener_Interface)
&& ! ($listener instanceof Doctrine_Overloadable)
) {
throw new Doctrine_Db_Exception("Couldn't set eventlistener for database handler. EventListeners should implement either Doctrine_Db_EventListener_Interface or Doctrine_Overloadable");
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}
$this->listener = $listener;
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return $this;
}
/**
* connect
* connects into database
*
* @return boolean
*/
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public function connect()
{
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if ($this->isConnected)
return false;
$this->dbh = new PDO($this->options['dsn'], $this->options['username'], $this->options['password']);
$this->dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->dbh->setAttribute(PDO::ATTR_STATEMENT_CLASS, array("Doctrine_Db_Statement", array($this)));
$this->isConnected = true;
return true;
}
/**
* getConnection
*
* @param string $dsn PEAR::DB like DSN or PDO like DSN
* format for PEAR::DB like DSN: schema://user:password@address/dbname
*
* @return
*/
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public static function getConnection($dsn = null, $username = null, $password = null)
{
return new self($dsn, $username, $password);
}
/**
* driverName
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* converts a driver name like (oracle) to appropriate PDO
* driver name (oci8 in the case of oracle)
*
* @param string $name
* @return string
*/
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public static function driverName($name)
{
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if (isset(self::$driverMap[$name])) {
return self::$driverMap[$name];
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}
return $name;
}
/**
* parseDSN
*
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* @param string $dsn
* @return array Parsed contents of DSN
*/
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function parseDSN($dsn)
{
// silence any warnings
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$parts = @parse_url($dsn);
$names = array('scheme', 'host', 'port', 'user', 'pass', 'path', 'query', 'fragment');
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foreach ($names as $name) {
if ( ! isset($parts[$name])) {
$parts[$name] = null;
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}
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}
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if (count($parts) == 0 || ! isset($parts['scheme'])) {
throw new Doctrine_Db_Exception('Empty data source name');
}
$drivers = self::getAvailableDrivers();
$parts['scheme'] = self::driverName($parts['scheme']);
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if ( ! in_array($parts['scheme'], $drivers)) {
throw new Doctrine_Db_Exception('Driver '.$parts['scheme'].' not availible or extension not loaded');
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}
switch ($parts['scheme']) {
case 'sqlite':
if (isset($parts['host']) && $parts['host'] == ':memory') {
$parts['database'] = ':memory:';
$parts['dsn'] = 'sqlite::memory:';
}
break;
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case 'mysql':
case 'informix':
case 'oci8':
case 'mssql':
case 'firebird':
case 'pgsql':
case 'odbc':
if ( ! isset($parts['path']) || $parts['path'] == '/') {
throw new Doctrine_Db_Exception('No database availible in data source name');
}
if (isset($parts['path'])) {
$parts['database'] = substr($parts['path'], 1);
}
if ( ! isset($parts['host'])) {
throw new Doctrine_Db_Exception('No hostname set in data source name');
}
$parts['dsn'] = $parts["scheme"].":host=".$parts["host"].";dbname=".$parts["database"];
break;
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default:
throw new Doctrine_Db_Exception('Unknown driver '.$parts['scheme']);
}
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return $parts;
}
/**
* clear
* clears all instances from the memory
*
* @return void
*/
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public static function clear()
{
self::$instances = array();
}
/**
* errorCode
* Fetch the SQLSTATE associated with the last operation on the database handle
*
* @return integer
*/
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public function errorCode()
{
return $this->dbh->errorCode();
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}
/**
* errorInfo
* Fetch extended error information associated with the last operation on the database handle
*
* @return array
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*/
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public function errorInfo()
{
return $this->dbh->errorInfo();
}
/**
* prepare
*
* @param string $statement
*/
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public function prepare($statement)
{
$this->connect();
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$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::PREPARE, $statement);
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$this->listener->onPrePrepare($event);
$stmt = $this->dbh->prepare($statement);
$this->listener->onPrepare($event);
$this->querySequence++;
return $stmt;
}
/**
* query
*
* @param string $statement
* @param array $params
* @return Doctrine_Db_Statement|boolean
*/
public function query($statement, array $params = array()) {
$this->connect();
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$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::QUERY, $statement);
$this->listener->onPreQuery($event);
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if ( ! empty($params)) {
$stmt = $this->dbh->query($statement)->execute($params);
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} else {
$stmt = $this->dbh->query($statement);
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}
$this->listener->onQuery($event);
$this->querySequence++;
return $stmt;
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}
/**
* quote
* quotes a string for use in a query
*
* @param string $input
* @return string
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*/
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public function quote($input)
{
$this->connect();
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return $this->dbh->quote($input);
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}
/**
* exec
* executes an SQL statement and returns the number of affected rows
*
* @param string $statement
* @return integer
*/
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public function exec($statement)
{
$this->connect();
$args = func_get_args();
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$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::EXEC, $statement);
$this->listener->onPreExec($event);
$rows = $this->dbh->exec($statement);
$this->listener->onExec($event);
return $rows;
}
/**
* lastInsertId
*
* @return integer
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*/
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public function lastInsertId()
{
$this->connect();
return $this->dbh->lastInsertId();
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}
/**
* begins a transaction
*
* @return boolean
*/
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public function beginTransaction()
{
$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::BEGIN);
$this->listener->onPreBeginTransaction($event);
$return = $this->dbh->beginTransaction();
$this->listener->onBeginTransaction($event);
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return $return;
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}
/**
* commits a transaction
*
* @return boolean
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*/
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public function commit()
{
$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::COMMIT);
$this->listener->onPreCommit($event);
$return = $this->dbh->commit();
$this->listener->onCommit($event);
return $return;
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}
/**
* rollBack
*
* @return boolean
*/
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public function rollBack()
{
$this->connect();
$event = new Doctrine_Db_Event($this, Doctrine_Db_Event::ROLLBACK);
$this->listener->onPreRollback($event);
$this->dbh->rollBack();
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$this->listener->onRollback($event);
}
/**
* getAttribute
* retrieves a database connection attribute
*
* @param integer $attribute
* @return mixed
*/
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public function getAttribute($attribute)
{
$this->connect();
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return $this->dbh->getAttribute($attribute);
}
/**
* returns an array of available PDO drivers
*/
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public static function getAvailableDrivers()
{
return PDO::getAvailableDrivers();
}
/**
* setAttribute
* sets an attribute
*
* @param integer $attribute
* @param mixed $value
* @return boolean
*/
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public function setAttribute($attribute, $value)
{
$this->connect();
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$this->dbh->setAttribute($attribute, $value);
}
/**
* getIterator
*
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* @return ArrayIterator
*/
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public function getIterator()
{
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if ($this->listener instanceof Doctrine_Db_Profiler)
return $this->listener;
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}
/**
* count
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* returns the number of executed queries
*
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* @return integer
*/
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public function count()
{
return $this->querySequence;
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}
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}