dsn)) { $this->dsn = 'sqlsrv:Server='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname); empty($this->port) OR $this->dsn .= ','.$this->port; empty($this->database) OR $this->dsn .= ';Database='.$this->database; // Some custom options if (isset($this->QuotedId)) { $this->dsn .= ';QuotedId='.$this->QuotedId; $this->_quoted_identifier = (bool) $this->QuotedId; } if (isset($this->ConnectionPooling)) { $this->dsn .= ';ConnectionPooling='.$this->ConnectionPooling; } if ($this->encrypt === TRUE) { $this->dsn .= ';Encrypt=1'; } if (isset($this->TraceOn)) { $this->dsn .= ';TraceOn='.$this->TraceOn; } if (isset($this->TrustServerCertificate)) { $this->dsn .= ';TrustServerCertificate='.$this->TrustServerCertificate; } empty($this->APP) OR $this->dsn .= ';APP='.$this->APP; empty($this->Failover_Partner) OR $this->dsn .= ';Failover_Partner='.$this->Failover_Partner; empty($this->LoginTimeout) OR $this->dsn .= ';LoginTimeout='.$this->LoginTimeout; empty($this->MultipleActiveResultSets) OR $this->dsn .= ';MultipleActiveResultSets='.$this->MultipleActiveResultSets; empty($this->TraceFile) OR $this->dsn .= ';TraceFile='.$this->TraceFile; empty($this->WSID) OR $this->dsn .= ';WSID='.$this->WSID; } elseif (preg_match('/QuotedId=(0|1)/', $this->dsn, $match)) { $this->_quoted_identifier = (bool) $match[1]; } } // -------------------------------------------------------------------- /** * Database connection * * @param bool $persistent * @return object */ public function db_connect($persistent = FALSE) { if ( ! empty($this->char_set) && preg_match('/utf[^8]*8/i', $this->char_set)) { $this->options[PDO::SQLSRV_ENCODING_UTF8] = 1; } $this->conn_id = parent::db_connect($persistent); if ( ! is_object($this->conn_id) OR is_bool($this->_quoted_identifier)) { 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) { $sql = 'SELECT '.$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) { $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT FROM INFORMATION_SCHEMA.Columns WHERE UPPER(TABLE_NAME) = '.$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) { // As of SQL Server 2012 (11.0.*) OFFSET is supported if (version_compare($this->version(), '11', '>=')) { // SQL Server OFFSET-FETCH can be used only with the ORDER BY clause empty($this->qb_orderby) && $sql .= ' ORDER BY 1'; return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY'; } $limit = $this->qb_offset + $this->qb_limit; // An ORDER BY clause is required for ROW_NUMBER() to work if ($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; } }