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📝 Mengedit: mssql_driver.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright	Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.3.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * MS SQL 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/userguide3/database/
 */
class CI_DB_mssql_driver extends CI_DB {

/**
	 * Database driver
	 *
	 * @var	string
	 */
	public $dbdriver = 'mssql';

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

/**
	 * 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 = TRUE;

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

/**
	 * Class constructor
	 *
	 * Appends the port number to the hostname, if needed.
	 *
	 * @param	array	$params
	 * @return	void
	 */
	public function __construct($params)
	{
		parent::__construct($params);

if ( ! empty($this->port))
		{
			$this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
		}
	}

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

/**
	 * Non-persistent database connection
	 *
	 * @param	bool	$persistent
	 * @return	resource
	 */
	public function db_connect($persistent = FALSE)
	{
		$this->conn_id = ($persistent)
				? mssql_pconnect($this->hostname, $this->username, $this->password)
				: mssql_connect($this->hostname, $this->username, $this->password);

if ( ! $this->conn_id)
		{
			return FALSE;
		}

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

// Select the DB... assuming a database name is specified in the config file
		if ($this->database !== '' && ! $this->db_select())
		{
			log_message('error', 'Unable to select database: '.$this->database);

return ($this->db_debug === TRUE)
				? $this->display_error('db_unable_to_select', $this->database)
				: FALSE;
		}

// 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;
	}

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

/**
	 * Select the database
	 *
	 * @param	string	$database
	 * @return	bool
	 */
	public function db_select($database = '')
	{
		if ($database === '')
		{
			$database = $this->database;
		}

// Note: Escaping is required in the event that the DB name
		// contains reserved characters.
		if (mssql_select_db('['.$database.']', $this->conn_id))
		{
			$this->database = $database;
			$this->data_cache = array();
			return TRUE;
		}

return FALSE;
	}

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

/**
	 * Execute the query
	 *
	 * @param	string	$sql	an SQL query
	 * @return	mixed	resource if rows are returned, bool otherwise
	 */
	protected function _execute($sql)
	{
		return mssql_query($sql, $this->conn_id);
	}

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

/**
	 * Begin Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_begin()
	{
		return $this->simple_query('BEGIN TRAN');
	}

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

/**
	 * Commit Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_commit()
	{
		return $this->simple_query('COMMIT TRAN');
	}

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

/**
	 * Rollback Transaction
	 *
	 * @return	bool
	 */
	protected function _trans_rollback()
	{
		return $this->simple_query('ROLLBACK TRAN');
	}

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

/**
	 * Affected Rows
	 *
	 * @return	int
	 */
	public function affected_rows()
	{
		return mssql_rows_affected($this->conn_id);
	}

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

/**
	 * Insert ID
	 *
	 * Returns the last id created in the Identity column.
	 *
	 * @return	string
	 */
	public function insert_id()
	{
		$query = version_compare($this->version(), '8', '>=')
			? 'SELECT SCOPE_IDENTITY() AS last_id'
			: 'SELECT @@IDENTITY AS last_id';

$query = $this->query($query);
		$query = $query->row();
		return $query->last_id;
	}

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

/**
	 * Set client character set
	 *
	 * @param	string	$charset
	 * @return	bool
	 */
	protected function _db_set_charset($charset)
	{
		return (ini_set('mssql.charset', $charset) !== FALSE);
	}

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

/**
	 * Version number query string
	 *
	 * @return	string
	 */
	protected function _version()
	{
		return "SELECT SERVERPROPERTY('ProductVersion') AS ver";
	}

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

/**
	 * List 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 !== FALSE && $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');
	}

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

/**
	 * List 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;
	}

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

/**
	 * Error
	 *
	 * Returns an array containing code and message of the last
	 * database error that has occurred.
	 *
	 * @return	array
	 */
	public function error()
	{
		// We need this because the error info is discarded by the
		// server the first time you request it, and query() already
		// calls error() once for logging purposes when a query fails.
		static $error = array('code' => 0, 'message' => NULL);

$message = mssql_get_last_message();
		if ( ! empty($message))
		{
			$error['code']    = $this->query('SELECT @@ERROR AS code')->row()->code;
			$error['message'] = $message;
		}

return $error;
	}

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

/**
	 * 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);
	}

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

/**
	 * Truncate statement
	 *
	 * Generates a platform-specific truncate string from the supplied data
	 *
	 * If the database does not support the TRUNCATE statement,
	 * then this method maps to 'DELETE FROM table'
	 *
	 * @param	string	$table
	 * @return	string
	 */
	protected function _truncate($table)
	{
		return 'TRUNCATE TABLE '.$table;
	}

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

/**
	 * 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)
	{
		$limit = $this->qb_offset + $this->qb_limit;

// As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
		// however an ORDER BY clause is required for it to work
		if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($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;
	}

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

/**
	 * Close DB Connection
	 *
	 * @return	void
	 */
	protected function _close()
	{
		mssql_close($this->conn_id);
	}

}

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