Current File : /www/old2/_music/diplomka/diplomka/src/API/libs/dibi/drivers/mssql.php
<?php
/**
* This file is part of the "dibi" - smart database abstraction layer.
*
* Copyright (c) 2005 David Grudl (http://davidgrudl.com)
*
* For the full copyright and license information, please view
* the file license.txt that was distributed with this source code.
*/
require_once dirname(__FILE__) . '/mssql.reflector.php';
/**
* The dibi driver for MS SQL database.
*
* Driver options:
* - host => the MS SQL server host name. It can also include a port number (hostname:port)
* - username (or user)
* - password (or pass)
* - database => the database name to select
* - persistent (bool) => try to find a persistent link?
* - resource (resource) => existing connection resource
* - lazy, profiler, result, substitutes, ... => see DibiConnection options
*
* @author David Grudl
* @package dibi\drivers
*/
class DibiMsSqlDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
{
/** @var resource Connection resource */
private $connection;
/** @var resource Resultset resource */
private $resultSet;
/** @var bool */
private $autoFree = TRUE;
/**
* @throws DibiNotSupportedException
*/
public function __construct()
{
if (!extension_loaded('mssql')) {
throw new DibiNotSupportedException("PHP extension 'mssql' is not loaded.");
}
}
/**
* Connects to a database.
* @return void
* @throws DibiException
*/
public function connect(array &$config)
{
if (isset($config['resource'])) {
$this->connection = $config['resource'];
} elseif (empty($config['persistent'])) {
$this->connection = @mssql_connect($config['host'], $config['username'], $config['password'], TRUE); // intentionally @
} else {
$this->connection = @mssql_pconnect($config['host'], $config['username'], $config['password']); // intentionally @
}
if (!is_resource($this->connection)) {
throw new DibiDriverException("Can't connect to DB.");
}
if (isset($config['database']) && !@mssql_select_db($this->escape($config['database'], dibi::IDENTIFIER), $this->connection)) { // intentionally @
throw new DibiDriverException("Can't select DB '$config[database]'.");
}
}
/**
* Disconnects from a database.
* @return void
*/
public function disconnect()
{
mssql_close($this->connection);
}
/**
* Executes the SQL query.
* @param string SQL statement.
* @return IDibiResultDriver|NULL
* @throws DibiDriverException
*/
public function query($sql)
{
$res = @mssql_query($sql, $this->connection); // intentionally @
if ($res === FALSE) {
throw new DibiDriverException(mssql_get_last_message(), 0, $sql);
} elseif (is_resource($res)) {
return $this->createResultDriver($res);
}
}
/**
* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query.
* @return int|FALSE number of rows or FALSE on error
*/
public function getAffectedRows()
{
return mssql_rows_affected($this->connection);
}
/**
* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
* @return int|FALSE int on success or FALSE on failure
*/
public function getInsertId($sequence)
{
$res = mssql_query('SELECT @@IDENTITY', $this->connection);
if (is_resource($res)) {
$row = mssql_fetch_row($res);
return $row[0];
}
return FALSE;
}
/**
* Begins a transaction (if supported).
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function begin($savepoint = NULL)
{
$this->query('BEGIN TRANSACTION');
}
/**
* Commits statements in a transaction.
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function commit($savepoint = NULL)
{
$this->query('COMMIT');
}
/**
* Rollback changes in a transaction.
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function rollback($savepoint = NULL)
{
$this->query('ROLLBACK');
}
/**
* Returns the connection resource.
* @return mixed
*/
public function getResource()
{
return is_resource($this->connection) ? $this->connection : NULL;
}
/**
* Returns the connection reflector.
* @return IDibiReflector
*/
public function getReflector()
{
return new DibiMsSqlReflector($this);
}
/**
* Result set driver factory.
* @param resource
* @return IDibiResultDriver
*/
public function createResultDriver($resource)
{
$res = clone $this;
$res->resultSet = $resource;
return $res;
}
/********************* SQL ****************d*g**/
/**
* Encodes data for use in a SQL statement.
* @param mixed value
* @param string type (dibi::TEXT, dibi::BOOL, ...)
* @return string encoded value
* @throws InvalidArgumentException
*/
public function escape($value, $type)
{
switch ($type) {
case dibi::TEXT:
case dibi::BINARY:
return "'" . str_replace("'", "''", $value) . "'";
case dibi::IDENTIFIER:
// @see http://msdn.microsoft.com/en-us/library/ms176027.aspx
return '[' . str_replace(array('[', ']'), array('[[', ']]'), $value) . ']';
case dibi::BOOL:
return $value ? 1 : 0;
case dibi::DATE:
return $value instanceof DateTime ? $value->format("'Y-m-d'") : date("'Y-m-d'", $value);
case dibi::DATETIME:
return $value instanceof DateTime ? $value->format("'Y-m-d H:i:s'") : date("'Y-m-d H:i:s'", $value);
default:
throw new InvalidArgumentException('Unsupported type.');
}
}
/**
* Encodes string for use in a LIKE statement.
* @param string
* @param int
* @return string
*/
public function escapeLike($value, $pos)
{
$value = strtr($value, array("'" => "''", '%' => '[%]', '_' => '[_]', '[' => '[[]'));
return ($pos <= 0 ? "'%" : "'") . $value . ($pos >= 0 ? "%'" : "'");
}
/**
* Decodes data from result set.
* @param string value
* @param string type (dibi::BINARY)
* @return string decoded value
* @throws InvalidArgumentException
*/
public function unescape($value, $type)
{
if ($type === dibi::BINARY) {
return $value;
}
throw new InvalidArgumentException('Unsupported type.');
}
/**
* Injects LIMIT/OFFSET to the SQL query.
* @param string &$sql The SQL query that will be modified.
* @param int $limit
* @param int $offset
* @return void
*/
public function applyLimit(&$sql, $limit, $offset)
{
// offset support is missing
if ($limit >= 0) {
$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ') t';
}
if ($offset) {
throw new DibiNotImplementedException('Offset is not implemented.');
}
}
/********************* result set ****************d*g**/
/**
* Automatically frees the resources allocated for this result set.
* @return void
*/
public function __destruct()
{
$this->autoFree && $this->getResultResource() && $this->free();
}
/**
* Returns the number of rows in a result set.
* @return int
*/
public function getRowCount()
{
return mssql_num_rows($this->resultSet);
}
/**
* Fetches the row at current position and moves the internal cursor to the next position.
* @param bool TRUE for associative array, FALSE for numeric
* @return array array on success, nonarray if no next record
*/
public function fetch($assoc)
{
return mssql_fetch_array($this->resultSet, $assoc ? MSSQL_ASSOC : MSSQL_NUM);
}
/**
* Moves cursor position without fetching row.
* @param int the 0-based cursor pos to seek to
* @return boolean TRUE on success, FALSE if unable to seek to specified record
*/
public function seek($row)
{
return mssql_data_seek($this->resultSet, $row);
}
/**
* Frees the resources allocated for this result set.
* @return void
*/
public function free()
{
mssql_free_result($this->resultSet);
$this->resultSet = NULL;
}
/**
* Returns metadata for all columns in a result set.
* @return array
*/
public function getResultColumns()
{
$count = mssql_num_fields($this->resultSet);
$columns = array();
for ($i = 0; $i < $count; $i++) {
$row = (array) mssql_fetch_field($this->resultSet, $i);
$columns[] = array(
'name' => $row['name'],
'fullname' => $row['column_source'] ? $row['column_source'] . '.' . $row['name'] : $row['name'],
'table' => $row['column_source'],
'nativetype' => $row['type'],
);
}
return $columns;
}
/**
* Returns the result set resource.
* @return mixed
*/
public function getResultResource()
{
$this->autoFree = FALSE;
return is_resource($this->resultSet) ? $this->resultSet : NULL;
}
}
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