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; } $this->subdriver = 'dblib'; } } // -------------------------------------------------------------------- /** * Non-persistent database connection * * @param bool * @return object */ public function db_connect($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 $this->conn_id; } // -------------------------------------------------------------------- /** * Show table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($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 the table name * @return string */ protected function _list_columns($table = '') { return 'SELECT '.$this->escape_identifiers('column_name') .' FROM '.$this->escape_identifiers('information_schema.columns') .' WHERE '.$this->escape_identifiers('table_name').' = '.$this->escape($table); } // -------------------------------------------------------------------- /** * Update statement * * Generates a platform-specific update string from the supplied data * * @param string the table name * @param array the update data * @return string */ protected function _update($table, $values) { $this->qb_limit = FALSE; $this->qb_orderby = array(); return parent::_update($table, $values); } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @param string the table name * @return string */ protected function _delete($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($table); } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @param string the sql query string * @return string */ protected function _limit($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); } } /* End of file pdo_dblib_driver.php */ /* Location: ./system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php */