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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 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/) * @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'); /** * ODBC 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_odbc_driver extends CI_DB_driver { /** * Database driver * * @var string */ public $dbdriver = 'odbc'; /** * Database schema * * @var string */ public $schema = 'public'; // -------------------------------------------------------------------- /** * Identifier escape character * * Must be empty for ODBC. * * @var string */ protected $_escape_char = ''; /** * ESCAPE statement string * * @var string */ protected $_like_escape_str = " {escape '%s'} "; /** * ORDER BY random keyword * * @var array */ protected $_random_keyword = array('RND()', 'RND(%d)'); // -------------------------------------------------------------------- /** * ODBC result ID resource returned from odbc_prepare() * * @var resource */ private $odbc_result; /** * Values to use with odbc_execute() for prepared statements * * @var array */ private $binds = array(); // -------------------------------------------------------------------- /** * Class constructor * * @param array $params * @return void */ public function __construct($params) { parent::__construct($params); // Legacy support for DSN in the hostname field if (empty($this->dsn)) { $this->dsn = $this->hostname; } } // -------------------------------------------------------------------- /** * Non-persistent database connection * * @param bool $persistent * @return resource */ public function db_connect($persistent = FALSE) { return ($persistent === TRUE) ? odbc_pconnect($this->dsn, $this->username, $this->password) : odbc_connect($this->dsn, $this->username, $this->password); } // -------------------------------------------------------------------- /** * Compile Bindings * * @param string $sql SQL statement * @param array $binds An array of values to bind * @return string */ public function compile_binds($sql, $binds) { if (empty($binds) OR empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE) { return $sql; } elseif ( ! is_array($binds)) { $binds = array($binds); $bind_count = 1; } else { // Make sure we're using numeric keys $binds = array_values($binds); $bind_count = count($binds); } // We'll need the marker length later $ml = strlen($this->bind_marker); // Make sure not to replace a chunk inside a string that happens to match the bind marker if ($c = preg_match_all("/'[^']*'|\"[^\"]*\"/i", $sql, $matches)) { $c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', str_replace($matches[0], str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]), $sql, $c), $matches, PREG_OFFSET_CAPTURE); // Bind values' count must match the count of markers in the query if ($bind_count !== $c) { return $sql; } } elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count) { return $sql; } if ($this->bind_marker !== '?') { do { $c--; $sql = substr_replace($sql, '?', $matches[0][$c][1], $ml); } while ($c !== 0); } if (FALSE !== ($this->odbc_result = odbc_prepare($this->conn_id, $sql))) { $this->binds = array_values($binds); } return $sql; } // -------------------------------------------------------------------- /** * Execute the query * * @param string $sql an SQL query * @return resource */ protected function _execute($sql) { if ( ! isset($this->odbc_result)) { return odbc_exec($this->conn_id, $sql); } elseif ($this->odbc_result === FALSE) { return FALSE; } if (TRUE === ($success = odbc_execute($this->odbc_result, $this->binds))) { // For queries that return result sets, return the result_id resource on success $this->is_write_type($sql) OR $success = $this->odbc_result; } $this->odbc_result = NULL; $this->binds = array(); return $success; } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ protected function _trans_begin() { return odbc_autocommit($this->conn_id, FALSE); } // -------------------------------------------------------------------- /** * Commit Transaction * * @return bool */ protected function _trans_commit() { if (odbc_commit($this->conn_id)) { odbc_autocommit($this->conn_id, TRUE); return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Rollback Transaction * * @return bool */ protected function _trans_rollback() { if (odbc_rollback($this->conn_id)) { odbc_autocommit($this->conn_id, TRUE); return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * 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) { $this->display_error('db_unsupported_feature'); } // -------------------------------------------------------------------- /** * Affected Rows * * @return int */ public function affected_rows() { return odbc_num_rows($this->result_id); } // -------------------------------------------------------------------- /** * Insert ID * * @return bool */ public function insert_id() { return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE; } // -------------------------------------------------------------------- /** * 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; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string $table * @return string */ protected function _list_columns($table = '') { return 'SHOW COLUMNS FROM '.$table; } // -------------------------------------------------------------------- /** * Field data query * * Generates a platform-specific query so that the column data can be retrieved * * @param string $table * @return string */ protected function _field_data($table) { return 'SELECT TOP 1 FROM '.$table; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occurred. * * @return array */ public function error() { return array('code' => odbc_error($this->conn_id), 'message' => odbc_errormsg($this->conn_id)); } // -------------------------------------------------------------------- /** * Close DB Connection * * @return void */ protected function _close() { odbc_close($this->conn_id); } }
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