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369 lines
11 KiB
369 lines
11 KiB
<?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 - 2016, 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 - 2016, 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 SQLSRV 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_sqlsrv_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 = 'sqlsrv'; |
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// -------------------------------------------------------------------- |
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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('NEWID()', 'RAND(%d)'); |
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/** |
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* Quoted identifier flag |
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* |
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* Whether to use SQL-92 standard quoted identifier |
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* (double quotes) or brackets for identifier escaping. |
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* |
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* @var bool |
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*/ |
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protected $_quoted_identifier; |
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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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$this->dsn = 'sqlsrv:Server='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname); |
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empty($this->port) OR $this->dsn .= ','.$this->port; |
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empty($this->database) OR $this->dsn .= ';Database='.$this->database; |
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// Some custom options |
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if (isset($this->QuotedId)) |
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{ |
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$this->dsn .= ';QuotedId='.$this->QuotedId; |
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$this->_quoted_identifier = (bool) $this->QuotedId; |
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} |
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if (isset($this->ConnectionPooling)) |
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{ |
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$this->dsn .= ';ConnectionPooling='.$this->ConnectionPooling; |
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} |
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if ($this->encrypt === TRUE) |
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{ |
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$this->dsn .= ';Encrypt=1'; |
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} |
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if (isset($this->TraceOn)) |
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{ |
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$this->dsn .= ';TraceOn='.$this->TraceOn; |
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} |
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if (isset($this->TrustServerCertificate)) |
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{ |
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$this->dsn .= ';TrustServerCertificate='.$this->TrustServerCertificate; |
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} |
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empty($this->APP) OR $this->dsn .= ';APP='.$this->APP; |
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empty($this->Failover_Partner) OR $this->dsn .= ';Failover_Partner='.$this->Failover_Partner; |
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empty($this->LoginTimeout) OR $this->dsn .= ';LoginTimeout='.$this->LoginTimeout; |
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empty($this->MultipleActiveResultSets) OR $this->dsn .= ';MultipleActiveResultSets='.$this->MultipleActiveResultSets; |
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empty($this->TraceFile) OR $this->dsn .= ';TraceFile='.$this->TraceFile; |
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empty($this->WSID) OR $this->dsn .= ';WSID='.$this->WSID; |
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} |
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elseif (preg_match('/QuotedId=(0|1)/', $this->dsn, $match)) |
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{ |
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$this->_quoted_identifier = (bool) $match[1]; |
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} |
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} |
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// -------------------------------------------------------------------- |
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/** |
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* Database connection |
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* |
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* @param bool $persistent |
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* @return object |
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*/ |
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public function db_connect($persistent = FALSE) |
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{ |
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if ( ! empty($this->char_set) && preg_match('/utf[^8]*8/i', $this->char_set)) |
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{ |
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$this->options[PDO::SQLSRV_ENCODING_UTF8] = 1; |
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} |
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$this->conn_id = parent::db_connect($persistent); |
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if ( ! is_object($this->conn_id) OR is_bool($this->_quoted_identifier)) |
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{ |
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return $this->conn_id; |
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} |
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// Determine how identifiers are escaped |
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$query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi'); |
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$query = $query->row_array(); |
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$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi']; |
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$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']'); |
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return $this->conn_id; |
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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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$sql = 'SELECT '.$this->escape_identifiers('name') |
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.' FROM '.$this->escape_identifiers('sysobjects') |
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.' WHERE '.$this->escape_identifiers('type')." = 'U'"; |
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if ($prefix_limit === TRUE && $this->dbprefix !== '') |
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{ |
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$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$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 $sql.' ORDER BY '.$this->escape_identifiers('name'); |
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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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return 'SELECT COLUMN_NAME |
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FROM INFORMATION_SCHEMA.Columns |
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WHERE 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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$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT |
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FROM INFORMATION_SCHEMA.Columns |
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WHERE UPPER(TABLE_NAME) = '.$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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$retval[$i]->max_length = ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION; |
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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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* Update statement |
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* |
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* Generates a platform-specific update string from the supplied data |
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* |
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* @param string $table |
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* @param array $values |
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* @return string |
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*/ |
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protected function _update($table, $values) |
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{ |
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$this->qb_limit = FALSE; |
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$this->qb_orderby = array(); |
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return parent::_update($table, $values); |
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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 ($this->qb_limit) |
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{ |
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return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete'; |
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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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// As of SQL Server 2012 (11.0.*) OFFSET is supported |
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if (version_compare($this->version(), '11', '>=')) |
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{ |
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// SQL Server OFFSET-FETCH can be used only with the ORDER BY clause |
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empty($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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$limit = $this->qb_offset + $this->qb_limit; |
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// An ORDER BY clause is required for ROW_NUMBER() to work |
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if ($this->qb_offset && ! empty($this->qb_orderby)) |
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{ |
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$orderby = $this->_compile_order_by(); |
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// We have to strip the ORDER BY clause |
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$sql = trim(substr($sql, 0, strrpos($sql, $orderby))); |
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// Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results |
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if (count($this->qb_select) === 0) |
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{ |
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$select = '*'; // Inevitable |
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} |
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else |
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{ |
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// Use only field names and their aliases, everything else is out of our scope. |
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$select = array(); |
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$field_regexp = ($this->_quoted_identifier) |
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? '("[^\"]+")' : '(\[[^\]]+\])'; |
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for ($i = 0, $c = count($this->qb_select); $i < $c; $i++) |
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{ |
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$select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m) |
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? $m[1] : $this->qb_select[$i]; |
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} |
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$select = implode(', ', $select); |
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} |
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return 'SELECT '.$select." FROM (\n\n" |
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.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql) |
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."\n\n) ".$this->escape_identifiers('CI_subquery') |
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."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit; |
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} |
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return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql); |
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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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* Generates a platform-specific insert string from the supplied data. |
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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 $values INSERT values |
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* @return string|bool |
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*/ |
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protected function _insert_batch($table, $keys, $values) |
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{ |
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// Multiple-value inserts are only supported as of SQL Server 2008 |
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if (version_compare($this->version(), '10', '>=')) |
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{ |
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return parent::_insert_batch($table, $keys, $values); |
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} |
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return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; |
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} |
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}
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