diff options
Diffstat (limited to 'system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php')
-rw-r--r-- | system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php new file mode 100644 index 000000000..cf049b61d --- /dev/null +++ b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php @@ -0,0 +1,329 @@ +<?php +/** + * CodeIgniter + * + * An open source application development framework for PHP 5.2.4 or newer + * + * NOTICE OF LICENSE + * + * Licensed under the Open Software License version 3.0 + * + * This source file is subject to the Open Software License (OSL 3.0) that is + * bundled with this package in the files license.txt / license.rst. It is + * also available through the world wide web at this URL: + * http://opensource.org/licenses/OSL-3.0 + * If you did not receive a copy of the license and are unable to obtain it + * through the world wide web, please send an email to + * licensing@ellislab.com so we can send you a copy immediately. + * + * @package CodeIgniter + * @author EllisLab Dev Team + * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) + * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) + * @link http://codeigniter.com + * @since Version 3.0.0 + * @filesource + */ +defined('BASEPATH') OR exit('No direct script access allowed'); + +/** + * PDO DBLIB 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 http://codeigniter.com/user_guide/database/ + */ +class CI_DB_pdo_dblib_driver extends CI_DB_pdo_driver { + + /** + * Sub-driver + * + * @var string + */ + public $subdriver = 'dblib'; + + // -------------------------------------------------------------------- + + /** + * ORDER BY random keyword + * + * @var array + */ + protected $_random_keyword = array('NEWID()', 'RAND(%d)'); + + /** + * Quoted identifier flag + * + * Whether to use SQL-92 standard quoted identifier + * (double quotes) or brackets for identifier escaping. + * + * @var bool + */ + protected $_quoted_identifier; + + // -------------------------------------------------------------------- + + /** + * Class constructor + * + * Builds the DSN if not already set. + * + * @param array $params + * @return void + */ + public function __construct($params) + { + parent::__construct($params); + + if (empty($this->dsn)) + { + $this->dsn = $params['subdriver'].':host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname); + + if ( ! empty($this->port)) + { + $this->dsn .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port; + } + + empty($this->database) OR $this->dsn .= ';dbname='.$this->database; + empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set; + empty($this->appname) OR $this->dsn .= ';appname='.$this->appname; + } + else + { + if ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE) + { + $this->dsn .= ';charset='.$this->char_set; + } + + $this->subdriver = 'dblib'; + } + } + + // -------------------------------------------------------------------- + + /** + * Database connection + * + * @param bool $persistent + * @return object + */ + public function db_connect($persistent = FALSE) + { + $this->conn_id = parent::db_connect($persistent); + + if ( ! is_object($this->conn_id)) + { + return $this->conn_id; + } + + // Determine how identifiers are escaped + $query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi'); + $query = $query->row_array(); + $this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi']; + $this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']'); + + return $this->conn_id; + } + + // -------------------------------------------------------------------- + + /** + * Show table query + * + * Generates a platform-specific query string so that the table names can be fetched + * + * @param bool $prefix_limit + * @return string + */ + protected function _list_tables($prefix_limit = FALSE) + { + return 'SELECT '.$this->escape_identifiers('name') + .' FROM '.$this->escape_identifiers('sysobjects') + .' WHERE '.$this->escape_identifiers('type')." = 'U'"; + + if ($prefix_limit === TRUE && $this->dbprefix !== '') + { + $sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' " + .sprintf($this->_like_escape_str, $this->_like_escape_chr); + } + + return $sql.' ORDER BY '.$this->escape_identifiers('name'); + } + + // -------------------------------------------------------------------- + + /** + * 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 'SELECT COLUMN_NAME + FROM INFORMATION_SCHEMA.Columns + WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table)); + } + + // -------------------------------------------------------------------- + + /** + * Returns an object with field data + * + * @param string $table + * @return array + */ + public function field_data($table = '') + { + if ($table === '') + { + return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE; + } + + $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT + FROM INFORMATION_SCHEMA.Columns + WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table)); + + if (($query = $this->query($sql)) === FALSE) + { + return FALSE; + } + $query = $query->result_object(); + + $retval = array(); + for ($i = 0, $c = count($query); $i < $c; $i++) + { + $retval[$i] = new stdClass(); + $retval[$i]->name = $query[$i]->COLUMN_NAME; + $retval[$i]->type = $query[$i]->DATA_TYPE; + $retval[$i]->max_length = ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION; + $retval[$i]->default = $query[$i]->COLUMN_DEFAULT; + } + + return $retval; + } + + // -------------------------------------------------------------------- + + /** + * Update statement + * + * Generates a platform-specific update string from the supplied data + * + * @param string $table + * @param array $values + * @return string + */ + protected function _update($table, $values) + { + $this->qb_limit = FALSE; + $this->qb_orderby = array(); + return parent::_update($table, $values); + } + + // -------------------------------------------------------------------- + + /** + * Delete statement + * + * Generates a platform-specific delete string from the supplied data + * + * @param string $table + * @return string + */ + protected function _delete($table) + { + if ($this->qb_limit) + { + return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete'; + } + + return parent::_delete($table); + } + + // -------------------------------------------------------------------- + + /** + * LIMIT + * + * Generates a platform-specific LIMIT clause + * + * @param string $sql SQL Query + * @return string + */ + protected function _limit($sql) + { + $limit = $this->qb_offset + $this->qb_limit; + + // As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported, + // however an ORDER BY clause is required for it to work + if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby)) + { + $orderby = $this->_compile_order_by(); + + // We have to strip the ORDER BY clause + $sql = trim(substr($sql, 0, strrpos($sql, $orderby))); + + // Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results + if (count($this->qb_select) === 0) + { + $select = '*'; // Inevitable + } + else + { + // Use only field names and their aliases, everything else is out of our scope. + $select = array(); + $field_regexp = ($this->_quoted_identifier) + ? '("[^\"]+")' : '(\[[^\]]+\])'; + for ($i = 0, $c = count($this->qb_select); $i < $c; $i++) + { + $select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m) + ? $m[1] : $this->qb_select[$i]; + } + $select = implode(', ', $select); + } + + return 'SELECT '.$select." FROM (\n\n" + .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql) + ."\n\n) ".$this->escape_identifiers('CI_subquery') + ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit; + } + + return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql); + } + + // -------------------------------------------------------------------- + + /** + * 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 $values INSERT values + * @return string|bool + */ + protected function _insert_batch($table, $keys, $values) + { + // Multiple-value inserts are only supported as of SQL Server 2008 + if (version_compare($this->version(), '10', '>=')) + { + return parent::_insert_batch($table, $keys, $values); + } + + return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; + } + +} + +/* End of file pdo_dblib_driver.php */ +/* Location: ./system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php */
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