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if (isset($this->db->data_cache['db_names'])) { return $this->db->data_cache['db_names']; } elseif ($this->_list_databases === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; } $this->db->data_cache['db_names'] = array(); $query = $this->db->query($this->_list_databases); if ($query === FALSE) { return $this->db->data_cache['db_names']; } for ($i = 0, $query = $query->result_array(), $c = count($query); $i < $c; $i++) { $this->db->data_cache['db_names'][] = current($query[$i]); } return $this->db->data_cache['db_names']; } // -------------------------------------------------------------------- /** * Determine if a particular database exists * * @param string $database_name * @return bool */ public function database_exists($database_name) { return in_array($database_name, $this->list_databases()); } // -------------------------------------------------------------------- /** * Optimize Table * * @param string $table_name * @return mixed */ public function optimize_table($table_name) { if ($this->_optimize_table === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; } $query = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name))); if ($query !== FALSE) { $query = $query->result_array(); return current($query); } return FALSE; } // -------------------------------------------------------------------- /** * Optimize Database * * @return mixed */ public function optimize_database() { if ($this->_optimize_table === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; } $result = array(); foreach ($this->db->list_tables() as $table_name) { $res = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name))); if (is_bool($res)) { return $res; } // Build the result array... $res = $res->result_array(); $res = current($res); $key = str_replace($this->db->database.'.', '', current($res)); $keys = array_keys($res); unset($res[$keys[0]]); $result[$key] = $res; } return $result; } // -------------------------------------------------------------------- /** * Repair Table * * @param string $table_name * @return mixed */ public function repair_table($table_name) { if ($this->_repair_table === FALSE) { return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE; } $query = $this->db->query(sprintf($this->_repair_table, $this->db->escape_identifiers($table_name))); if (is_bool($query)) { return $query; } $query = $query->result_array(); return current($query); } // -------------------------------------------------------------------- /** * Generate CSV from a query result object * * @param object $query Query result object * @param string $delim Delimiter (default: ,) * @param string $newline Newline character (default: \n) * @param string $enclosure Enclosure (default: ") * @return string */ public function csv_from_result($query, $delim = ',', $newline = "\n", $enclosure = '"') { if ( ! is_object($query) OR ! method_exists($query, 'list_fields')) { show_error('You must submit a valid result object'); } $out = ''; // First generate the headings from the table column names foreach ($query->list_fields() as $name) { $out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim; } $out = substr($out, 0, -strlen($delim)).$newline; // Next blast through the result array and build out the rows while ($row = $query->unbuffered_row('array')) { $line = array(); foreach ($row as $item) { $line[] = $enclosure.str_replace($enclosure, $enclosure.$enclosure, (string) $item).$enclosure; } $out .= implode($delim, $line).$newline; } return $out; } // -------------------------------------------------------------------- /** * Generate XML data from a query result object * * @param object $query Query result object * @param array $params Any preferences * @return string */ public function xml_from_result($query, $params = array()) { if ( ! is_object($query) OR ! method_exists($query, 'list_fields')) { show_error('You must submit a valid result object'); } // Set our default values foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val) { if ( ! isset($params[$key])) { $params[$key] = $val; } } // Create variables for convenience extract($params); // Load the xml helper get_instance()->load->helper('xml'); // Generate the result $xml = '<'.$root.'>'.$newline; while ($row = $query->unbuffered_row()) { $xml .= $tab.'<'.$element.'>'.$newline; foreach ($row as $key => $val) { $xml .= $tab.$tab.'<'.$key.'>'.xml_convert($val).''.$newline; } $xml .= $tab.''.$newline; } return $xml.''.$newline; } // -------------------------------------------------------------------- /** * Database Backup * * @param array $params * @return string */ public function backup($params = array()) { // If the parameters have not been submitted as an // array then we know that it is simply the table // name, which is a valid short cut. if (is_string($params)) { $params = array('tables' => $params); } // Set up our default preferences $prefs = array( 'tables' => array(), 'ignore' => array(), 'filename' => '', 'format' => 'gzip', // gzip, zip, txt 'add_drop' => TRUE, 'add_insert' => TRUE, 'newline' => "\n", 'foreign_key_checks' => TRUE ); // Did the user submit any preferences? If so set them.... if (count($params) > 0) { foreach ($prefs as $key => $val) { if (isset($params[$key])) { $prefs[$key] = $params[$key]; } } } // Are we backing up a complete database or individual tables? // If no table names were submitted we'll fetch the entire table list if (count($prefs['tables']) === 0) { $prefs['tables'] = $this->db->list_tables(); } // Validate the format if ( ! in_array($prefs['format'], array('gzip', 'zip', 'txt'), TRUE)) { $prefs['format'] = 'txt'; } // Is the encoder supported? If not, we'll either issue an // error or use plain text depending on the debug settings if (($prefs['format'] === 'gzip' && ! function_exists('gzencode')) OR ($prefs['format'] === 'zip' && ! function_exists('gzcompress'))) { if ($this->db->db_debug) { return $this->db->display_error('db_unsupported_compression'); } $prefs['format'] = 'txt'; } // Was a Zip file requested? if ($prefs['format'] === 'zip') { // Set the filename if not provided (only needed with Zip files) if ($prefs['filename'] === '') { $prefs['filename'] = (count($prefs['tables']) === 1 ? $prefs['tables'] : $this->db->database) .date('Y-m-d_H-i', time()).'.sql'; } else { // If they included the .zip file extension we'll remove it if (preg_match('|.+?\.zip$|', $prefs['filename'])) { $prefs['filename'] = str_replace('.zip', '', $prefs['filename']); } // Tack on the ".sql" file extension if needed if ( ! preg_match('|.+?\.sql$|', $prefs['filename'])) { $prefs['filename'] .= '.sql'; } } // Load the Zip class and output it $CI =& get_instance(); $CI->load->library('zip'); $CI->zip->add_data($prefs['filename'], $this->_backup($prefs)); return $CI->zip->get_zip(); } elseif ($prefs['format'] === 'txt') // Was a text file requested? { return $this->_backup($prefs); } elseif ($prefs['format'] === 'gzip') // Was a Gzip file requested? { return gzencode($this->_backup($prefs)); } return; } }