702 lines
17 KiB
PHP
702 lines
17 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2018, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.4.1
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* oci8 Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the query builder
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/database/
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*/
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/**
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* oci8 Database Adapter Class
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*
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* This is a modification of the DB_driver class to
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* permit access to oracle databases
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*
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* @author Kelly McArdle
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*/
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class CI_DB_oci8_driver extends CI_DB {
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/**
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* Database driver
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*
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* @var string
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*/
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public $dbdriver = 'oci8';
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/**
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* Statement ID
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*
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* @var resource
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*/
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public $stmt_id;
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/**
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* Cursor ID
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*
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* @var resource
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*/
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public $curs_id;
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/**
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* Commit mode flag
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*
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* @var int
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*/
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public $commit_mode = OCI_COMMIT_ON_SUCCESS;
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/**
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* Limit used flag
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*
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* If we use LIMIT, we'll add a field that will
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* throw off num_fields later.
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*
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* @var bool
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*/
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public $limit_used = FALSE;
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// --------------------------------------------------------------------
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/**
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* Reset $stmt_id flag
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*
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* Used by stored_procedure() to prevent _execute() from
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* re-setting the statement ID.
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*/
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protected $_reset_stmt_id = TRUE;
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/**
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* List of reserved identifiers
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*
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* Identifiers that must NOT be escaped.
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*
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* @var string[]
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*/
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protected $_reserved_identifiers = array('*', 'rownum');
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/**
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* ORDER BY random keyword
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*
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* @var array
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*/
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protected $_random_keyword = array('ASC', 'ASC'); // not currently supported
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/**
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* COUNT string
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*
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* @used-by CI_DB_driver::count_all()
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* @used-by CI_DB_query_builder::count_all_results()
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*
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* @var string
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*/
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protected $_count_string = 'SELECT COUNT(1) AS ';
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// --------------------------------------------------------------------
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/**
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* Class constructor
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*
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* @param array $params
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* @return void
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*/
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public function __construct($params)
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{
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parent::__construct($params);
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$valid_dsns = array(
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'tns' => '/^\(DESCRIPTION=(\(.+\)){2,}\)$/', // TNS
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// Easy Connect string (Oracle 10g+)
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'ec' => '/^(\/\/)?[a-z0-9.:_-]+(:[1-9][0-9]{0,4})?(\/[a-z0-9$_]+)?(:[^\/])?(\/[a-z0-9$_]+)?$/i',
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'in' => '/^[a-z0-9$_]+$/i' // Instance name (defined in tnsnames.ora)
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);
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/* Space characters don't have any effect when actually
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* connecting, but can be a hassle while validating the DSN.
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*/
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$this->dsn = str_replace(array("\n", "\r", "\t", ' '), '', $this->dsn);
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if ($this->dsn !== '')
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{
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foreach ($valid_dsns as $regexp)
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{
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if (preg_match($regexp, $this->dsn))
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{
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return;
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}
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}
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}
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// Legacy support for TNS in the hostname configuration field
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$this->hostname = str_replace(array("\n", "\r", "\t", ' '), '', $this->hostname);
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if (preg_match($valid_dsns['tns'], $this->hostname))
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{
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$this->dsn = $this->hostname;
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return;
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}
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elseif ($this->hostname !== '' && strpos($this->hostname, '/') === FALSE && strpos($this->hostname, ':') === FALSE
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&& (( ! empty($this->port) && ctype_digit($this->port)) OR $this->database !== ''))
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{
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/* If the hostname field isn't empty, doesn't contain
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* ':' and/or '/' and if port and/or database aren't
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* empty, then the hostname field is most likely indeed
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* just a hostname. Therefore we'll try and build an
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* Easy Connect string from these 3 settings, assuming
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* that the database field is a service name.
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*/
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$this->dsn = $this->hostname
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.(( ! empty($this->port) && ctype_digit($this->port)) ? ':'.$this->port : '')
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.($this->database !== '' ? '/'.ltrim($this->database, '/') : '');
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if (preg_match($valid_dsns['ec'], $this->dsn))
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{
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return;
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}
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}
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/* At this point, we can only try and validate the hostname and
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* database fields separately as DSNs.
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*/
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if (preg_match($valid_dsns['ec'], $this->hostname) OR preg_match($valid_dsns['in'], $this->hostname))
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{
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$this->dsn = $this->hostname;
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return;
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}
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$this->database = str_replace(array("\n", "\r", "\t", ' '), '', $this->database);
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foreach ($valid_dsns as $regexp)
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{
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if (preg_match($regexp, $this->database))
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{
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return;
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}
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}
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/* Well - OK, an empty string should work as well.
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* PHP will try to use environment variables to
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* determine which Oracle instance to connect to.
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*/
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$this->dsn = '';
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}
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// --------------------------------------------------------------------
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/**
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* Non-persistent database connection
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*
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* @param bool $persistent
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* @return resource
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*/
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public function db_connect($persistent = FALSE)
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{
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$func = ($persistent === TRUE) ? 'oci_pconnect' : 'oci_connect';
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return empty($this->char_set)
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? $func($this->username, $this->password, $this->dsn)
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: $func($this->username, $this->password, $this->dsn, $this->char_set);
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}
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// --------------------------------------------------------------------
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/**
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* Database version number
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*
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* @return string
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*/
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public function version()
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{
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if (isset($this->data_cache['version']))
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{
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return $this->data_cache['version'];
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}
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if ( ! $this->conn_id OR ($version_string = oci_server_version($this->conn_id)) === FALSE)
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{
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return FALSE;
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}
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elseif (preg_match('#Release\s(\d+(?:\.\d+)+)#', $version_string, $match))
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{
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return $this->data_cache['version'] = $match[1];
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @param string $sql an SQL query
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* @return resource
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*/
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protected function _execute($sql)
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{
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/* Oracle must parse the query before it is run. All of the actions with
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* the query are based on the statement id returned by oci_parse().
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*/
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if ($this->_reset_stmt_id === TRUE)
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{
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$this->stmt_id = oci_parse($this->conn_id, $sql);
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}
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oci_set_prefetch($this->stmt_id, 1000);
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return oci_execute($this->stmt_id, $this->commit_mode);
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}
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// --------------------------------------------------------------------
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/**
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* Get cursor. Returns a cursor from the database
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*
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* @return resource
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*/
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public function get_cursor()
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{
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return $this->curs_id = oci_new_cursor($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Stored Procedure. Executes a stored procedure
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*
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* @param string package name in which the stored procedure is in
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* @param string stored procedure name to execute
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* @param array parameters
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* @return mixed
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*
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* params array keys
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*
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* KEY OPTIONAL NOTES
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* name no the name of the parameter should be in :<param_name> format
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* value no the value of the parameter. If this is an OUT or IN OUT parameter,
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* this should be a reference to a variable
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* type yes the type of the parameter
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* length yes the max size of the parameter
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*/
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public function stored_procedure($package, $procedure, array $params)
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{
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if ($package === '' OR $procedure === '')
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{
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log_message('error', 'Invalid query: '.$package.'.'.$procedure);
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return ($this->db_debug) ? $this->display_error('db_invalid_query') : FALSE;
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}
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// Build the query string
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$sql = 'BEGIN '.$package.'.'.$procedure.'(';
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$have_cursor = FALSE;
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foreach ($params as $param)
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{
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$sql .= $param['name'].',';
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if (isset($param['type']) && $param['type'] === OCI_B_CURSOR)
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{
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$have_cursor = TRUE;
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}
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}
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$sql = trim($sql, ',').'); END;';
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$this->_reset_stmt_id = FALSE;
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$this->stmt_id = oci_parse($this->conn_id, $sql);
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$this->_bind_params($params);
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$result = $this->query($sql, FALSE, $have_cursor);
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$this->_reset_stmt_id = TRUE;
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return $result;
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}
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// --------------------------------------------------------------------
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/**
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* Bind parameters
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*
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* @param array $params
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* @return void
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*/
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protected function _bind_params($params)
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{
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if ( ! is_array($params) OR ! is_resource($this->stmt_id))
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{
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return;
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}
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foreach ($params as $param)
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{
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foreach (array('name', 'value', 'type', 'length') as $val)
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{
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if ( ! isset($param[$val]))
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{
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$param[$val] = '';
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}
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}
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oci_bind_by_name($this->stmt_id, $param['name'], $param['value'], $param['length'], $param['type']);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @return bool
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*/
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protected function _trans_begin()
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{
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$this->commit_mode = OCI_NO_AUTO_COMMIT;
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @return bool
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*/
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protected function _trans_commit()
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{
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$this->commit_mode = OCI_COMMIT_ON_SUCCESS;
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return oci_commit($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @return bool
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*/
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protected function _trans_rollback()
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{
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$this->commit_mode = OCI_COMMIT_ON_SUCCESS;
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return oci_rollback($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @return int
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*/
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public function affected_rows()
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{
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return oci_num_rows($this->stmt_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @return int
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*/
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public function insert_id()
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{
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// not supported in oracle
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return $this->display_error('db_unsupported_function');
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}
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// --------------------------------------------------------------------
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/**
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* Show table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @param bool $prefix_limit
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* @return string
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*/
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protected function _list_tables($prefix_limit = FALSE)
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{
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$sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"';
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if ($prefix_limit !== FALSE && $this->dbprefix !== '')
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{
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return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
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.sprintf($this->_like_escape_str, $this->_like_escape_chr);
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @param string $table
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* @return string
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*/
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protected function _list_columns($table = '')
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{
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if (strpos($table, '.') !== FALSE)
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{
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sscanf($table, '%[^.].%s', $owner, $table);
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}
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else
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{
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$owner = $this->username;
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}
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return 'SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
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WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
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AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
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}
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// --------------------------------------------------------------------
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/**
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* Returns an object with field data
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*
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* @param string $table
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* @return array
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*/
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public function field_data($table)
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{
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if (strpos($table, '.') !== FALSE)
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{
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sscanf($table, '%[^.].%s', $owner, $table);
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}
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else
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{
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$owner = $this->username;
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}
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$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHAR_LENGTH, DATA_PRECISION, DATA_LENGTH, DATA_DEFAULT, NULLABLE
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FROM ALL_TAB_COLUMNS
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WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
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AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
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if (($query = $this->query($sql)) === FALSE)
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{
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return FALSE;
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}
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$query = $query->result_object();
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$retval = array();
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for ($i = 0, $c = count($query); $i < $c; $i++)
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{
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$retval[$i] = new stdClass();
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$retval[$i]->name = $query[$i]->COLUMN_NAME;
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$retval[$i]->type = $query[$i]->DATA_TYPE;
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$length = ($query[$i]->CHAR_LENGTH > 0)
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? $query[$i]->CHAR_LENGTH : $query[$i]->DATA_PRECISION;
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if ($length === NULL)
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{
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$length = $query[$i]->DATA_LENGTH;
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}
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$retval[$i]->max_length = $length;
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$default = $query[$i]->DATA_DEFAULT;
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if ($default === NULL && $query[$i]->NULLABLE === 'N')
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{
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$default = '';
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}
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$retval[$i]->default = $default;
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}
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return $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occurred.
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*
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* @return array
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*/
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public function error()
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{
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// oci_error() returns an array that already contains
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// 'code' and 'message' keys, but it can return false
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// if there was no error ....
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if (is_resource($this->curs_id))
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{
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$error = oci_error($this->curs_id);
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}
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elseif (is_resource($this->stmt_id))
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{
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$error = oci_error($this->stmt_id);
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}
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elseif (is_resource($this->conn_id))
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{
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$error = oci_error($this->conn_id);
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}
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else
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{
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$error = oci_error();
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}
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return is_array($error)
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? $error
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: array('code' => '', 'message' => '');
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}
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// --------------------------------------------------------------------
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/**
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* 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 $values INSERT values
|
|
* @return string
|
|
*/
|
|
protected function _insert_batch($table, $keys, $values)
|
|
{
|
|
$keys = implode(', ', $keys);
|
|
$sql = "INSERT ALL\n";
|
|
|
|
for ($i = 0, $c = count($values); $i < $c; $i++)
|
|
{
|
|
$sql .= ' INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";
|
|
}
|
|
|
|
return $sql.'SELECT * FROM dual';
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
$this->where('rownum <= ',$this->qb_limit, FALSE);
|
|
$this->qb_limit = FALSE;
|
|
}
|
|
|
|
return parent::_delete($table);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* LIMIT
|
|
*
|
|
* Generates a platform-specific LIMIT clause
|
|
*
|
|
* @param string $sql SQL Query
|
|
* @return string
|
|
*/
|
|
protected function _limit($sql)
|
|
{
|
|
if (version_compare($this->version(), '12.1', '>='))
|
|
{
|
|
// OFFSET-FETCH can be used only with the ORDER BY clause
|
|
empty($this->qb_orderby) && $sql .= ' ORDER BY 1';
|
|
|
|
return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';
|
|
}
|
|
|
|
$this->limit_used = TRUE;
|
|
return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($this->qb_offset + $this->qb_limit + 1).')'
|
|
.($this->qb_offset ? ' WHERE rnum >= '.($this->qb_offset + 1) : '');
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close DB Connection
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function _close()
|
|
{
|
|
oci_close($this->conn_id);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* We need to reset our $limit_used hack flag, so it doesn't propagate
|
|
* to subsequent queries.
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function _reset_select()
|
|
{
|
|
$this->limit_used = FALSE;
|
|
parent::_reset_select();
|
|
}
|
|
}
|