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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 1.3.0

 * @filesource

 */

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

/**

 * Postgre 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_postgre_driver extends CI_DB {

	/**

	 * Database driver

	 *

	 * @var	string

	 */

	public $dbdriver = 'postgre';

	/**

	 * Database schema

	 *

	 * @var	string

	 */

	public $schema = 'public';

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

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('RANDOM()', 'RANDOM()');

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

	/**

	 * Class constructor

	 *

	 * Creates a DSN string to be used for db_connect() and db_pconnect()

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if ( ! empty($this->dsn))

		{

			return;

		}

		$this->dsn === '' OR $this->dsn = '';

		if (strpos($this->hostname, '/') !== FALSE)

		{

			// If UNIX sockets are used, we shouldn't set a port

			$this->port = '';

		}

		$this->hostname === '' OR $this->dsn = 'host='.$this->hostname.' ';

		if ( ! empty($this->port) && ctype_digit($this->port))

		{

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

		}

		if ($this->username !== '')

		{

			$this->dsn .= 'user='.$this->username.' ';

			/* An empty password is valid!

			 *

			 * $db['password'] = NULL must be done in order to ignore it.

			 */

			$this->password === NULL OR $this->dsn .= "password='".$this->password."' ";

		}

		$this->database === '' OR $this->dsn .= 'dbname='.$this->database.' ';

		/* We don't have these options as elements in our standard configuration

		 * array, but they might be set by parse_url() if the configuration was

		 * provided via string. Example:

		 *

		 * postgre://username:password@localhost:5432/database?connect_timeout=5&sslmode=1

		 */

		foreach (array('connect_timeout', 'options', 'sslmode', 'service') as $key)

		{

			if (isset($this->$key) && is_string($this->$key) && $this->$key !== '')

			{

				$this->dsn .= $key."='".$this->$key."' ";

			}

		}

		$this->dsn = rtrim($this->dsn);

	}

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

	/**

	 * Database connection

	 *

	 * @param	bool	$persistent

	 * @return	resource

	 */

	public function db_connect($persistent = FALSE)

	{

		$this->conn_id = ($persistent === TRUE)

			? pg_pconnect($this->dsn)

			: pg_connect($this->dsn);

		if ($this->conn_id !== FALSE)

		{

			if ($persistent === TRUE

				&& pg_connection_status($this->conn_id) === PGSQL_CONNECTION_BAD

				&& pg_ping($this->conn_id) === FALSE

			)

			{

				return FALSE;

			}

			empty($this->schema) OR $this->simple_query('SET search_path TO '.$this->schema.',public');

		}

		return $this->conn_id;

	}

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

	/**

	 * Reconnect

	 *

	 * Keep / reestablish the db connection if no queries have been

	 * sent for a length of time exceeding the server's idle timeout

	 *

	 * @return	void

	 */

	public function reconnect()

	{

		if (pg_ping($this->conn_id) === FALSE)

		{

			$this->conn_id = FALSE;

		}

	}

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

	/**

	 * Set client character set

	 *

	 * @param	string	$charset

	 * @return	bool

	 */

	protected function _db_set_charset($charset)

	{

		return (pg_set_client_encoding($this->conn_id, $charset) === 0);

	}

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

	/**

	 * Database version number

	 *

	 * @return	string

	 */

	public function version()

	{

		if (isset($this->data_cache['version']))

		{

			return $this->data_cache['version'];

		}

		if ( ! $this->conn_id OR ($pg_version = pg_version($this->conn_id)) === FALSE)

		{

			return FALSE;

		}

		/* If PHP was compiled with PostgreSQL lib versions earlier

		 * than 7.4, pg_version() won't return the server version

		 * and so we'll have to fall back to running a query in

		 * order to get it.

		 */

		return (isset($pg_version['server']) && preg_match('#^(\d+\.\d+)#', $pg_version['server'], $match))

			? $this->data_cache['version'] = $match[1]

			: parent::version();

	}

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

	/**

	 * Execute the query

	 *

	 * @param	string	$sql	an SQL query

	 * @return	resource

	 */

	protected function _execute($sql)

	{

		return pg_query($this->conn_id, $sql);

	}

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

	/**

	 * Begin Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_begin()

	{

		return (bool) pg_query($this->conn_id, 'BEGIN');

	}

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

	/**

	 * Commit Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_commit()

	{

		return (bool) pg_query($this->conn_id, 'COMMIT');

	}

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

	/**

	 * Rollback Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_rollback()

	{

		return (bool) pg_query($this->conn_id, 'ROLLBACK');

	}

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

	/**

	 * Determines if a query is a "write" type.

	 *

	 * @param	string	An SQL query string

	 * @return	bool

	 */

	public function is_write_type($sql)

	{

		if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#is', $sql))

		{

			return FALSE;

		}

		return parent::is_write_type($sql);

	}

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

	/**

	 * Platform-dependent string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		return pg_escape_string($this->conn_id, $str);

	}

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

	/**

	 * "Smart" Escape String

	 *

	 * Escapes data based on type

	 *

	 * @param	string	$str

	 * @return	mixed

	 */

	public function escape($str)

	{

		if (is_php('5.4.4') && (is_string($str) OR (is_object($str) && method_exists($str, '__toString'))))

		{

			return pg_escape_literal($this->conn_id, $str);

		}

		elseif (is_bool($str))

		{

			return ($str) ? 'TRUE' : 'FALSE';

		}

		return parent::escape($str);

	}

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

	/**

	 * Affected Rows

	 *

	 * @return	int

	 */

	public function affected_rows()

	{

		return pg_affected_rows($this->result_id);

	}

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

	/**

	 * Insert ID

	 *

	 * @return	string

	 */

	public function insert_id()

	{

		$v = $this->version();

		$table	= (func_num_args() > 0) ? func_get_arg(0) : NULL;

		$column	= (func_num_args() > 1) ? func_get_arg(1) : NULL;

		if ($table === NULL && $v >= '8.1')

		{

			$sql = 'SELECT LASTVAL() AS ins_id';

		}

		elseif ($table !== NULL)

		{

			if ($column !== NULL && $v >= '8.0')

			{

				$sql = 'SELECT pg_get_serial_sequence(\''.$table."', '".$column."') AS seq";

				$query = $this->query($sql);

				$query = $query->row();

				$seq = $query->seq;

			}

			else

			{

				// seq_name passed in table parameter

				$seq = $table;

			}

			$sql = 'SELECT CURRVAL(\''.$seq."') AS ins_id";

		}

		else

		{

			return pg_last_oid($this->result_id);

		}

		$query = $this->query($sql);

		$query = $query->row();

		return (int) $query->ins_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)

	{

		$sql = 'SELECT "table_name" FROM "information_schema"."tables" WHERE "table_schema" = \''.$this->schema."'";

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

		{

			return $sql.' AND "table_name" LIKE \''

				.$this->escape_like_str($this->dbprefix)."%' "

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

		}

		return $sql;

	}

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

	/**

	 * 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 LOWER("table_name") = '.$this->escape(strtolower($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 LOWER("table_name") = '.$this->escape(strtolower($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()

	{

		return array('code' => '', 'message' => pg_last_error($this->conn_id));

	}

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

	/**

	 * ORDER BY

	 *

	 * @param	string	$orderby

	 * @param	string	$direction	ASC, DESC or RANDOM

	 * @param	bool	$escape

	 * @return	object

	 */

	public function order_by($orderby, $direction = '', $escape = NULL)

	{

		$direction = strtoupper(trim($direction));

		if ($direction === 'RANDOM')

		{

			if ( ! is_float($orderby) && ctype_digit((string) $orderby))

			{

				$orderby = ($orderby > 1)

					? (float) '0.'.$orderby

					: (float) $orderby;

			}

			if (is_float($orderby))

			{

				$this->simple_query('SET SEED '.$orderby);

			}

			$orderby = $this->_random_keyword[0];

			$direction = '';

			$escape = FALSE;

		}

		return parent::order_by($orderby, $direction, $escape);

	}

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

	/**

	 * 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);

	}

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

	/**

	 * Update_Batch statement

	 *

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

	 *

	 * @param	string	$table	Table name

	 * @param	array	$values	Update data

	 * @param	string	$index	WHERE key

	 * @return	string

	 */

	protected function _update_batch($table, $values, $index)

	{

		$ids = array();

		foreach ($values as $key => $val)

		{

			$ids[] = $val[$index]['value'];

			foreach (array_keys($val) as $field)

			{

				if ($field !== $index)

				{

					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];

				}

			}

		}

		$cases = '';

		foreach ($final as $k => $v)

		{

			$cases .= $k.' = (CASE '.$val[$index]['field']."\n"

				.implode("\n", $v)."\n"

				.'ELSE '.$k.' END), ';

		}

		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);

		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');

	}

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

	/**

	 * Delete statement

	 *

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

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _delete($table)

	{

		$this->qb_limit = FALSE;

		return parent::_delete($table);

	}

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

	/**

	 * LIMIT

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @param	string	$sql	SQL Query

	 * @return	string

	 */

	protected function _limit($sql)

	{

		return $sql.' LIMIT '.$this->qb_limit.($this->qb_offset ? ' OFFSET '.$this->qb_offset : '');

	}

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

	/**

	 * Close DB Connection

	 *

	 * @return	void

	 */

	protected function _close()

	{

		pg_close($this->conn_id);

	}

}