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freenetis-github/system/libraries/drivers/Database/Mssql.php @ c2e44ab0

8baed187 Michal Kliment
<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* MSSQL Database Driver
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Database_Mssql_Driver extends Database_Driver
{
/**
* Database connection link
*/
protected $link;

/**
* Database configuration
*/
protected $db_config;

/**
* Sets the config for the class.
*
* @param array database configuration
*/
public function __construct($config)
{
$this->db_config = $config;

Log::add('debug', 'MSSQL Database Driver Initialized');
}

/**
* Closes the database connection.
*/
public function __destruct()
{
is_resource($this->link) and mssql_close($this->link);
}

/**
* Make the connection
*
* @return return connection
*/
public function connect()
{
// Check if link already exists
if (is_resource($this->link))
return $this->link;

// Import the connect variables
extract($this->db_config['connection']);

// Persistent connections enabled?
$connect = ($this->db_config['persistent'] == TRUE) ? 'mssql_pconnect' : 'mssql_connect';

// Build the connection info
$host = isset($host) ? $host : $socket;

// Windows uses a comma instead of a colon
$port = (isset($port) AND is_string($port)) ? (KOHANA_IS_WIN ? ',' : ':').$port : '';

// Make the connection and select the database
if (($this->link = $connect($host.$port, $user, $pass, TRUE)) AND mssql_select_db($database, $this->link))
{
/* This is being removed so I can use it, will need to come up with a more elegant workaround in the future...
*
if ($charset = $this->db_config['character_set'])
{
$this->set_charset($charset);
}
*/

// Clear password after successful connect
$this->db_config['connection']['pass'] = NULL;

return $this->link;
}

return FALSE;
}

public function query($sql)
{
// Only cache if it's turned on, and only cache if it's not a write statement
if ($this->db_config['cache'] AND ! preg_match('#\b(?:INSERT|UPDATE|REPLACE|SET)\b#i', $sql))
{
$hash = $this->query_hash($sql);

if ( ! isset($this->query_cache[$hash]))
{
// Set the cached object
$this->query_cache[$hash] = new Mssql_Result(mssql_query($sql, $this->link), $this->link, $this->db_config['object'], $sql);
}
else
{
// Rewind cached result
$this->query_cache[$hash]->rewind();
}

// Return the cached query
return $this->query_cache[$hash];
}

return new Mssql_Result(mssql_query($sql, $this->link), $this->link, $this->db_config['object'], $sql);
}

public function escape_table($table)
{
if (stripos($table, ' AS ') !== FALSE)
{
// Force 'AS' to uppercase
$table = str_ireplace(' AS ', ' AS ', $table);

// Runs escape_table on both sides of an AS statement
$table = array_map(array($this, __FUNCTION__), explode(' AS ', $table));

// Re-create the AS statement
return implode(' AS ', $table);
}
return '['.str_replace('.', '[.]', $table).']';
}

public function escape_column($column)
{
if (!$this->db_config['escape'])
return $column;

if ($column == '*')
return $column;

// This matches any functions we support to SELECT.
if ( preg_match('/(avg|count|sum|max|min)\(\s*(.*)\s*\)(\s*as\s*(.+)?)?/i', $column, $matches))
{
if ( count($matches) == 3)
{
return $matches[1].'('.$this->escape_column($matches[2]).')';
}
else if ( count($matches) == 5)
{
return $matches[1].'('.$this->escape_column($matches[2]).') AS '.$this->escape_column($matches[2]);
}
}

// This matches any modifiers we support to SELECT.
if ( ! preg_match('/\b(?:rand|all|distinct(?:row)?|high_priority|sql_(?:small_result|b(?:ig_result|uffer_result)|no_cache|ca(?:che|lc_found_rows)))\s/i', $column))
{
if (stripos($column, ' AS ') !== FALSE)
{
// Force 'AS' to uppercase
$column = str_ireplace(' AS ', ' AS ', $column);

// Runs escape_column on both sides of an AS statement
$column = array_map(array($this, __FUNCTION__), explode(' AS ', $column));

// Re-create the AS statement
return implode(' AS ', $column);
}

return preg_replace('/[^.*]+/', '[$0]', $column);
}

$parts = explode(' ', $column);
$column = '';

for ($i = 0, $c = count($parts); $i < $c; $i++)
{
// The column is always last
if ($i == ($c - 1))
{
$column .= preg_replace('/[^.*]+/', '[$0]', $parts[$i]);
}
else // otherwise, it's a modifier
{
$column .= $parts[$i].' ';
}
}
return $column;
}

/**
* Limit in SQL Server 2000 only uses the keyword
* 'TOP'; 2007 may have an offset keyword, but
* I am unsure - for pagination style limit,offset
* functionality, a fancy query needs to be built.
*
* @param unknown_type $limit
* @return unknown
*/
public function limit($limit, $offset=null)
{
return 'TOP '.$limit;
}

public function compile_select($database)
{
$sql = ($database['distinct'] == TRUE) ? 'SELECT DISTINCT ' : 'SELECT ';
$sql .= (count($database['select']) > 0) ? implode(', ', $database['select']) : '*';

if (count($database['from']) > 0)
{
// Escape the tables
$froms = array();
foreach ($database['from'] as $from)
$froms[] = $this->escape_column($from);
$sql .= "\nFROM ";
$sql .= implode(', ', $froms);
}

if (count($database['join']) > 0)
{
foreach($database['join'] AS $join)
{
$sql .= "\n".$join['type'].'JOIN '.implode(', ', $join['tables']).' ON '.$join['conditions'];
}
}

if (count($database['where']) > 0)
{
$sql .= "\nWHERE ";
}

$sql .= implode("\n", $database['where']);

if (count($database['groupby']) > 0)
{
$sql .= "\nGROUP BY ";
$sql .= implode(', ', $database['groupby']);
}

if (count($database['having']) > 0)
{
$sql .= "\nHAVING ";
$sql .= implode("\n", $database['having']);
}

if (count($database['orderby']) > 0)
{
$sql .= "\nORDER BY ";
$sql .= implode(', ', $database['orderby']);
}

if (is_numeric($database['limit']))
{
$sql .= "\n";
$sql .= $this->limit($database['limit']);
}

return $sql;
}

public function escape_str($str)
{
if (!$this->db_config['escape'])
return $str;

is_resource($this->link) or $this->connect();
//mssql_real_escape_string($str, $this->link); <-- this function doesn't exist

$characters = array('/\x00/', '/\x1a/', '/\n/', '/\r/', '/\\\/', '/\'/');
$replace = array('\\\x00', '\\x1a', '\\n', '\\r', '\\\\', "''");
return preg_replace($characters, $replace, $str);
}

public function list_tables()
{
$sql = 'SHOW TABLES FROM ['.$this->db_config['connection']['database'].']';
$result = $this->query($sql)->result(FALSE, MSSQL_ASSOC);

$retval = array();
foreach ($result as $row)
{
$retval[] = current($row);
}

return $retval;
}

public function show_error()
{
return mssql_get_last_message($this->link);
}

public function list_fields($table)
{
$result = array();

foreach ($this->field_data($table) as $row)
{
// Make an associative array
$result[$row->Field] = $this->sql_type($row->Type);
}

return $result;
}

public function field_data($table)
{
$query = $this->query("SELECT COLUMN_NAME AS Field, DATA_TYPE as Type FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$this->escape_table($table)."'", $this->link);

return $query->result_array(TRUE);
}
}

/**
* MSSQL Result
*/
class Mssql_Result extends Database_Result {

// Fetch function and return type
protected $fetch_type = 'mssql_fetch_object';
protected $return_type = MSSQL_ASSOC;

/**
* Sets up the result variables.
*
* @param resource query result
* @param resource database link
* @param boolean return objects or arrays
* @param string SQL query that was run
*/
public function __construct($result, $link, $object = TRUE, $sql)
{
$this->result = $result;

// If the query is a resource, it was a SELECT, SHOW, DESCRIBE, EXPLAIN query
if (is_resource($result))
{
$this->current_row = 0;
$this->total_rows = mssql_num_rows($this->result);
$this->fetch_type = ($object === TRUE) ? 'mssql_fetch_object' : 'mssql_fetch_array';
}
elseif (is_bool($result))
{
if ($result == FALSE)
{
// SQL error
throw new Kohana_Database_Exception('database.error', mssql_get_last_message($link).' - '.$sql);
}
else
{
// Its an DELETE, INSERT, REPLACE, or UPDATE querys
$last_id = mssql_query('SELECT @@IDENTITY AS last_id', $link);
$result = mssql_fetch_assoc($last_id);
$this->insert_id = $result['last_id'];
$this->total_rows = mssql_rows_affected($link);
}
}

// Set result type
$this->result($object);

// Store the SQL
$this->sql = $sql;
}

/**
* Destruct, the cleanup crew!
*/
public function __destruct()
{
if (is_resource($this->result))
{
mssql_free_result($this->result);
}
}

public function result($object = TRUE, $type = MSSQL_ASSOC)
{
$this->fetch_type = ((bool) $object) ? 'mssql_fetch_object' : 'mssql_fetch_array';

// This check has to be outside the previous statement, because we do not
// know the state of fetch_type when $object = NULL
// NOTE - The class set by $type must be defined before fetching the result,
// autoloading is disabled to save a lot of stupid overhead.
if ($this->fetch_type == 'mssql_fetch_object')
{
$this->return_type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$this->return_type = $type;
}

return $this;
}

public function as_array($object = NULL, $type = MSSQL_ASSOC)
{
return $this->result_array($object, $type);
}

public function result_array($object = NULL, $type = MSSQL_ASSOC)
{
$rows = array();

if (is_string($object))
{
$fetch = $object;
}
elseif (is_bool($object))
{
if ($object === TRUE)
{
$fetch = 'mssql_fetch_object';

// NOTE - The class set by $type must be defined before fetching the result,
// autoloading is disabled to save a lot of stupid overhead.
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$fetch = 'mssql_fetch_array';
}
}
else
{
// Use the default config values
$fetch = $this->fetch_type;

if ($fetch == 'mssql_fetch_object')
{
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
}

if (mssql_num_rows($this->result))
{
// Reset the pointer location to make sure things work properly
mssql_data_seek($this->result, 0);

while ($row = $fetch($this->result, $type))
{
$rows[] = $row;
}
}

return isset($rows) ? $rows : array();
}

public function list_fields()
{
$field_names = array();
while ($field = mssql_fetch_field($this->result))
{
$field_names[] = $field->name;
}

return $field_names;
}

public function seek($offset)
{
if ( ! $this->offsetExists($offset))
return FALSE;

return mssql_data_seek($this->result, $offset);
}

} // End mssql_Result Class