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327 lines
8.3 KiB
327 lines
8.3 KiB
6 years ago
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<?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 3.0.0
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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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* PDO Oracle 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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class CI_DB_pdo_oci_driver extends CI_DB_pdo_driver {
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/**
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* Sub-driver
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*
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* @var string
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*/
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public $subdriver = 'oci';
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// --------------------------------------------------------------------
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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'); // Currently not 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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* Builds the DSN if not already set.
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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($params);
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if (empty($this->dsn))
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{
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$this->dsn = 'oci:dbname=';
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// Oracle has a slightly different PDO DSN format (Easy Connect),
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// which also supports pre-defined DSNs.
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if (empty($this->hostname) && empty($this->port))
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{
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$this->dsn .= $this->database;
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}
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else
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{
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$this->dsn .= '//'.(empty($this->hostname) ? '127.0.0.1' : $this->hostname)
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.(empty($this->port) ? '' : ':'.$this->port).'/';
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empty($this->database) OR $this->dsn .= $this->database;
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}
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empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
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}
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elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 4) === FALSE)
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{
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$this->dsn .= ';charset='.$this->char_set;
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}
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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 $this->data_cache['version'];
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}
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$version_string = parent::version();
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if (preg_match('#Release\s(?<version>\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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* 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 === TRUE && $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 = $query[$i]->COLUMN_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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* Insert batch statement
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*
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* @param string $table Table name
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* @param array $keys INSERT keys
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* @param array $values INSERT values
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* @return string
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*/
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protected function _insert_batch($table, $keys, $values)
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{
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$keys = implode(', ', $keys);
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$sql = "INSERT ALL\n";
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for ($i = 0, $c = count($values); $i < $c; $i++)
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{
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$sql .= ' INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";
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}
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return $sql.'SELECT * FROM dual';
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}
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// --------------------------------------------------------------------
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/**
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* Delete statement
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*
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* Generates a platform-specific delete string from the supplied data
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*
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* @param string $table
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* @return string
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*/
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protected function _delete($table)
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{
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if ($this->qb_limit)
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{
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$this->where('rownum <= ',$this->qb_limit, FALSE);
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$this->qb_limit = FALSE;
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}
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return parent::_delete($table);
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}
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// --------------------------------------------------------------------
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/**
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* LIMIT
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*
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* Generates a platform-specific LIMIT clause
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*
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* @param string $sql SQL Query
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* @return string
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*/
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protected function _limit($sql)
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{
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if (version_compare($this->version(), '12.1', '>='))
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{
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// OFFSET-FETCH can be used only with the ORDER BY clause
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empty($this->qb_orderby) && $sql .= ' ORDER BY 1';
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return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';
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}
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return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($this->qb_offset + $this->qb_limit + 1).')'
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.($this->qb_offset ? ' WHERE rnum >= '.($this->qb_offset + 1): '');
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}
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}
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