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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * PDO SQLSRV Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the query builder

 * class is being used or not.

 *

 * @package		CodeIgniter

 * @subpackage	Drivers

 * @category	Database

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_pdo_sqlsrv_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'sqlsrv';

	// --------------------------------------------------------------------

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('NEWID()', 'RAND(%d)');

	/**

	 * Quoted identifier flag

	 *

	 * Whether to use SQL-92 standard quoted identifier

	 * (double quotes) or brackets for identifier escaping.

	 *

	 * @var	bool

	 */

	protected $_quoted_identifier;

	// --------------------------------------------------------------------

	/**

	 * Class constructor

	 *

	 * Builds the DSN if not already set.

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if (empty($this->dsn))

		{

			$this->dsn = 'sqlsrv:Server='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);

			empty($this->port) OR $this->dsn .= ','.$this->port;

			empty($this->database) OR $this->dsn .= ';Database='.$this->database;

			// Some custom options

			if (isset($this->QuotedId))

			{

				$this->dsn .= ';QuotedId='.$this->QuotedId;

				$this->_quoted_identifier = (bool) $this->QuotedId;

			}

			if (isset($this->ConnectionPooling))

			{

				$this->dsn .= ';ConnectionPooling='.$this->ConnectionPooling;

			}

			if ($this->encrypt === TRUE)

			{

				$this->dsn .= ';Encrypt=1';

			}

			if (isset($this->TraceOn))

			{

				$this->dsn .= ';TraceOn='.$this->TraceOn;

			}

			if (isset($this->TrustServerCertificate))

			{

				$this->dsn .= ';TrustServerCertificate='.$this->TrustServerCertificate;

			}

			empty($this->APP) OR $this->dsn .= ';APP='.$this->APP;

			empty($this->Failover_Partner) OR $this->dsn .= ';Failover_Partner='.$this->Failover_Partner;

			empty($this->LoginTimeout) OR $this->dsn .= ';LoginTimeout='.$this->LoginTimeout;

			empty($this->MultipleActiveResultSets) OR $this->dsn .= ';MultipleActiveResultSets='.$this->MultipleActiveResultSets;

			empty($this->TraceFile) OR $this->dsn .= ';TraceFile='.$this->TraceFile;

			empty($this->WSID) OR $this->dsn .= ';WSID='.$this->WSID;

		}

		elseif (preg_match('/QuotedId=(0|1)/', $this->dsn, $match))

		{

			$this->_quoted_identifier = (bool) $match[1];

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Database connection

	 *

	 * @param	bool	$persistent

	 * @return	object

	 */

	public function db_connect($persistent = FALSE)

	{

		if ( ! empty($this->char_set) && preg_match('/utf[^8]*8/i', $this->char_set))

		{

			$this->options[PDO::SQLSRV_ENCODING_UTF8] = 1;

		}

		$this->conn_id = parent::db_connect($persistent);

		if ( ! is_object($this->conn_id) OR is_bool($this->_quoted_identifier))

		{

			return $this->conn_id;

		}

		// Determine how identifiers are escaped

		$query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');

		$query = $query->row_array();

		$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];

		$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');

		return $this->conn_id;

	}

	// --------------------------------------------------------------------

	/**

	 * Show table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @param	bool	$prefix_limit

	 * @return	string

	 */

	protected function _list_tables($prefix_limit = FALSE)

	{

		$sql = 'SELECT '.$this->escape_identifiers('name')

			.' FROM '.$this->escape_identifiers('sysobjects')

			.' WHERE '.$this->escape_identifiers('type')." = 'U'";

		if ($prefix_limit === TRUE && $this->dbprefix !== '')

		{

			$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "

				.sprintf($this->_like_escape_str, $this->_like_escape_chr);

		}

		return $sql.' ORDER BY '.$this->escape_identifiers('name');

	}

	// --------------------------------------------------------------------

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _list_columns($table = '')

	{

		return 'SELECT COLUMN_NAME

			FROM INFORMATION_SCHEMA.Columns

			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

	}

	// --------------------------------------------------------------------

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT

			FROM INFORMATION_SCHEMA.Columns

			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

		if (($query = $this->query($sql)) === FALSE)

		{

			return FALSE;

		}

		$query = $query->result_object();

		$retval = array();

		for ($i = 0, $c = count($query); $i < $c; $i++)

		{

			$retval[$i]			= new stdClass();

			$retval[$i]->name		= $query[$i]->COLUMN_NAME;

			$retval[$i]->type		= $query[$i]->DATA_TYPE;

			$retval[$i]->max_length		= ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION;

			$retval[$i]->default		= $query[$i]->COLUMN_DEFAULT;

		}

		return $retval;

	}

	// --------------------------------------------------------------------

	/**

	 * Update statement

	 *

	 * Generates a platform-specific update string from the supplied data

	 *

	 * @param	string	$table

	 * @param	array	$values

	 * @return	string

	 */

	protected function _update($table, $values)

	{

		$this->qb_limit = FALSE;

		$this->qb_orderby = array();

		return parent::_update($table, $values);

	}

	// --------------------------------------------------------------------

	/**

	 * Delete statement

	 *

	 * Generates a platform-specific delete string from the supplied data

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _delete($table)

	{

		if ($this->qb_limit)

		{

			return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete';

		}

		return parent::_delete($table);

	}

	// --------------------------------------------------------------------

	/**

	 * LIMIT

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @param	string	$sql	SQL Query

	 * @return	string

	 */

	protected function _limit($sql)

	{

		// As of SQL Server 2012 (11.0.*) OFFSET is supported

		if (version_compare($this->version(), '11', '>='))

		{

			// SQL Server OFFSET-FETCH can be used only with the ORDER BY clause

			empty($this->qb_orderby) && $sql .= ' ORDER BY 1';

			return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';

		}

		$limit = $this->qb_offset + $this->qb_limit;

		// An ORDER BY clause is required for ROW_NUMBER() to work

		if ($this->qb_offset && ! empty($this->qb_orderby))

		{

			$orderby = $this->_compile_order_by();

			// We have to strip the ORDER BY clause

			$sql = trim(substr($sql, 0, strrpos($sql, $orderby)));

			// Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results

			if (count($this->qb_select) === 0 OR strpos(implode(',', $this->qb_select), '*') !== FALSE)

			{

				$select = '*'; // Inevitable

			}

			else

			{

				// Use only field names and their aliases, everything else is out of our scope.

				$select = array();

				$field_regexp = ($this->_quoted_identifier)

					? '("[^\"]+")' : '(\[[^\]]+\])';

				for ($i = 0, $c = count($this->qb_select); $i < $c; $i++)

				{

					$select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m)

						? $m[1] : $this->qb_select[$i];

				}

				$select = implode(', ', $select);

			}

			return 'SELECT '.$select." FROM (\n\n"

				.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)

				."\n\n) ".$this->escape_identifiers('CI_subquery')

				."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit;

		}

		return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);

	}

	// --------------------------------------------------------------------

	/**

	 * Insert batch statement

	 *

	 * Generates a platform-specific insert string from the supplied data.

	 *

	 * @param	string	$table	Table name

	 * @param	array	$keys	INSERT keys

	 * @param	array	$values	INSERT values

	 * @return	string|bool

	 */

	protected function _insert_batch($table, $keys, $values)

	{

		// Multiple-value inserts are only supported as of SQL Server 2008

		if (version_compare($this->version(), '10', '>='))

		{

			return parent::_insert_batch($table, $keys, $values);

		}

		return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE;

	}

}