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/*
* $Id: MySQLConnection.php,v 1.18 2004/09/01 14:00:28 dlawson_mi Exp $
*
* 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 please see
* <http://creole.phpdb.org>.
*/
require_once 'creole/Connection.php';
require_once 'creole/common/ConnectionCommon.php';
include_once 'creole/drivers/mysql/MySQLResultSet.php';
/**
* MySQL implementation of Connection.
*
*
* @author Hans Lellelid <hans@xmpl.org>
* @author Stig Bakken <ssb@fast.no>
* @author Lukas Smith
* @version $Revision: 1.18 $
* @package creole.drivers.mysql
*/
class MySQLConnection extends ConnectionCommon implements Connection {
/** Current database (used in mysql_select_db()). */
private $database;
/**
* Connect to a database and log in as the specified user.
*
* @param $dsn the data source name (see DB::parseDSN for syntax)
* @param $flags Any conneciton flags.
* @access public
* @throws SQLException
* @return void
*/
function connect($dsninfo, $flags = 0)
{
if (!extension_loaded('mysql')) {
throw new SQLException('mysql extension not loaded');
}
$this->dsn = $dsninfo;
$this->flags = $flags;
$persistent = ($flags & Creole::PERSISTENT) === Creole::PERSISTENT;
if (isset($dsninfo['protocol']) && $dsninfo['protocol'] == 'unix') {
$dbhost = ':' . $dsninfo['socket'];
} else {
$dbhost = $dsninfo['hostspec'] ? $dsninfo['hostspec'] : 'localhost';
if (!empty($dsninfo['port'])) {
$dbhost .= ':' . $dsninfo['port'];
}
}
$user = $dsninfo['username'];
$pw = $dsninfo['password'];
$encoding = !empty($dsninfo['encoding']) ? $dsninfo['encoding'] : null;
$connect_function = $persistent ? 'mysql_pconnect' : 'mysql_connect';
@ini_set('track_errors', true);
if ($dbhost && $user && $pw) {
$conn = @$connect_function($dbhost, $user, $pw);
} elseif ($dbhost && $user) {
$conn = @$connect_function($dbhost, $user);
} elseif ($dbhost) {
$conn = @$connect_function($dbhost);
} else {
$conn = false;
}
@ini_restore('track_errors');
if (empty($conn)) {
if (($err = @mysql_error()) != '') {
throw new SQLException("connect failed", $err);
} elseif (empty($php_errormsg)) {
throw new SQLException("connect failed");
} else {
throw new SQLException("connect failed", $php_errormsg);
}
}
if ($dsninfo['database']) {
if (!@mysql_select_db($dsninfo['database'], $conn)) {
switch(mysql_errno($conn)) {
case 1049:
$exc = new SQLException("no such database", mysql_error($conn));
break;
case 1044:
$exc = new SQLException("access violation", mysql_error($conn));
break;
default:
$exc = new SQLException("cannot select database", mysql_error($conn));
}
throw $exc;
}
// fix to allow calls to different databases in the same script
$this->database = $dsninfo['database'];
}
$this->dblink = $conn;
if ($encoding) {
$this->executeUpdate("SET NAMES " . $encoding);
}
}
/**
* @see Connection::getDatabaseInfo()
*/
public function getDatabaseInfo()
{
return new MySQLDatabaseInfo($this);
}
/**
* @see Connection::getIdGenerator()
*/
public function getIdGenerator()
{
return new MySQLIdGenerator($this);
}
/**
* @see Connection::prepareStatement()
*/
public function prepareStatement($sql)
{
return new MySQLPreparedStatement($this, $sql);
}
/**
* @see Connection::prepareCall()
*/
public function prepareCall($sql) {
throw new SQLException('MySQL does not support stored procedures.');
}
/**
* @see Connection::createStatement()
*/
public function createStatement()
{
return new MySQLStatement($this);
}
/**
* @see Connection::disconnect()
*/
function close()
{
$ret = mysql_close($this->dblink);
$this->dblink = null;
return $ret;
}
/**
* @see Connection::applyLimit()
*/
public function applyLimit(&$sql, $offset, $limit)
{
if ( $limit > 0 ) {
$sql .= " LIMIT " . ($offset > 0 ? $offset . ", " : "") . $limit;
} else if ( $offset > 0 ) {
$sql .= " LIMIT " . $offset . ", 18446744073709551615";
}
}
/**
* @see Connection::executeQuery()
*/
function executeQuery($sql, $fetchmode = null)
{
$this->lastQuery = $sql;
if ($this->database) {
if (!@mysql_select_db($this->database, $this->dblink)) {
throw new SQLException('No database selected', mysql_error($this->dblink));
}
}//echo $sql . '<br /><br />';
$result = @mysql_query($sql, $this->dblink);
if (!$result) {
if (!defined('DEBUG_SQL')) {
define('DEBUG_SQL', 0);
}
if (DEBUG_SQL == 1) {
throw new SQLException('Could not execute query', mysql_error($this->dblink), $sql);
} else {
throw new SQLException('It is not possible to execute the query. Please contact your system administrator');
}
}
return new MySQLResultSet($this, $result, $fetchmode);
}
/**
* @see Connection::executeUpdate()
*/
function executeUpdate($sql)
{
$this->lastQuery = $sql;
if ($this->database) {
if (!@mysql_select_db($this->database, $this->dblink)) {
throw new SQLException('No database selected', mysql_error($this->dblink));
}
}
$result = @mysql_query($sql, $this->dblink);
if (!$result) {
throw new SQLException('Could not execute update', mysql_error($this->dblink), $sql);
}
return (int) mysql_affected_rows($this->dblink);
}
/**
* Start a database transaction.
* @throws SQLException
* @return void
*/
protected function beginTrans()
{
$result = @mysql_query('SET AUTOCOMMIT=0', $this->dblink);
$result = @mysql_query('BEGIN', $this->dblink);
if (!$result) {
throw new SQLException('Could not begin transaction', mysql_error($this->dblink));
}
}
/**
* Commit the current transaction.
* @throws SQLException
* @return void
*/
protected function commitTrans()
{
if ($this->database) {
if (!@mysql_select_db($this->database, $this->dblink)) {
throw new SQLException('No database selected', mysql_error($this->dblink));
}
}
$result = @mysql_query('COMMIT', $this->dblink);
$result = @mysql_query('SET AUTOCOMMIT=1', $this->dblink);
if (!$result) {
throw new SQLException('Can not commit transaction', mysql_error($this->dblink));
}
}
/**
* Roll back (undo) the current transaction.
* @throws SQLException
* @return void
*/
protected function rollbackTrans()
{
if ($this->database) {
if (!@mysql_select_db($this->database, $this->dblink)) {
throw new SQLException('No database selected', mysql_error($this->dblink));
}
}
$result = @mysql_query('ROLLBACK', $this->dblink);
$result = @mysql_query('SET AUTOCOMMIT=1', $this->dblink);
if (!$result) {
throw new SQLException('Could not rollback transaction', mysql_error($this->dblink));
}
}
/**
* Gets the number of rows affected by the data manipulation
* query.
*
* @return int Number of rows affected by the last query.
*/
function getUpdateCount()
{
return (int) @mysql_affected_rows($this->dblink);
}
}
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