php - insert on duplicate key update - in mysqli loop -

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i have database primary key 'id' , unique constraint made of price_date , fund_id , currency_id, , class_id

$query = "insert `price_data` (`price_date`, `fund_id`, `currency_id`, `class_id`, `nav`, `nav_change`) values";   $format = " ('%s', '%s', '%s', '%s', %f, %f),";  // go on each array item , append sql query foreach($prices $price) {     $query .= sprintf(         $format,         $mysqli->escape_string($price['pricedate']),         $mysqli->escape_string($price['fund']),         $mysqli->escape_string($price['currency']),         $mysqli->escape_string($price['class']),         $mysqli->escape_string($price['nav']),         $mysqli->escape_string($price['navchange'])     ); } // last values tuple has trailing comma cause // problems, let remove $query = rtrim($query, ',');  // mysqli::query returns boolean insert $result = $mysqli->query($query);

i want change query 

insert `price_data`(price_date , fund_id , currency_id , nav , nav_change) values () on duplicate key update nav='',nav_change='';

my attempt append original query isn't getting values nav , nav_chnge query. 

$query .= ' on duplicate key update nav=$format$mysqli->real_escape_string($data[\'nav\']),nav_change=$format,$mysqli->real_escape_string($data[\'navchange\'])';

if echo resulting query looks following

insert `price_data` (`price_date`, `fund_id` , `currency_id`, `class_id`, `nav`, `nav_change`) values ('2013-04-29', 'aaaa', '0', 'a', 11.793300, 0.054000), on duplicate key update nav=$format$mysqli->real_escape_string($data["nav"]),nav_change=$format,$mysqli->real_escape_string($data["navchange"])

thanks help.

there might cleaner way this, appending query inside loop worked me. 

$format = " ('%s', '%s', '%s', '%s', '%s', %f, %f)"; $format_update_nav = "  '%f' ,  "; $format_update_nav_change = "  '%f'  ; ";          $query = "insert `aprice_data` (`price_date`, `fund_id`, `manager_id` , `currency_id`, `class_id`, `nav`, `nav_change`) values ";                      $query .= sprintf(                         $format,                         $mysqli->real_escape_string($data['date']),                         $mysqli->real_escape_string($data['fund']),                         $mysqli->real_escape_string($data['manager']),                               $mysqli->real_escape_string($data['currency']),                         $mysqli->real_escape_string($data['class']),                         $mysqli->real_escape_string($data['nav']),                         $mysqli->real_escape_string($data['navchange'])                     );                      $query .= ' on duplicate key update nav = ';                     $query .= sprintf(                         $format_update_nav,                         $mysqli->real_escape_string($data['nav'])                                            );                      $query .= 'nav_change = ';                     $query .= sprintf(                         $format_update_nav_change,                         $mysqli->real_escape_string($data['navchange'])                                      );       $result = $mysqli->query($query);

this returned query looked this

insert `price_data` (`price_date`, `fund_id`, `manager_id` , `currency_id`, `class_id`, `nav`, `nav_change`) values ('2013-05-03', 'wxya', '17', '0', 'a', 456456.000000, 456456.000000) on duplicate key update nav = '456456.000000' , nav_change = '456456.000000' ;  insert `price_data` (`price_date`, `fund_id`, `manager_id` , `currency_id`, `class_id`, `nav`, `nav_change`) values ('2013-05-03', 'bxya', '17', '0', 'a', 0.130000, 0.000000) on duplicate key update nav = '0.130000' , nav_change = '0.000000' ; . . .

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