MYSQL PHP准备语句

Question

I understand how prepared statements work and I need to insert 2 million rows so in this case using a prepared statement is the best option for me. My question and problem is I have a compound unique key on row2 and row3 so I can use ON DUPLICATE KEY UPDATE in the prepared statement fine but what if I wish to use a condition and only update if the lastupdated DATE is before the comparison date? Without a prepared statement I can just use a simple IF in the ON DUPLICATE KEY UPDATE but I can not seem to implement it with a prepared statement since the variables are bound and will be set within the loop after the prepared statement is created.

$link = new mysqli(db_host,db_user,db_pass,db_db);
if($link->connect_errno){
echo "Failed to connect to MySQL.";
}

if(!($stmt = $link->prepare("INSERT INTO table(`id`,`lastupdated`,`col1`,`col2`,`col3`,`col4`,`col5`,`col6`,`col7`,`col8`,`col9`) VALUES (?,?,?,?,?,?,?,?,?,?,?)"))){
echo "Prepare failed: (" . $link->errno . ") " . $link->error;
}

Answer 1

values() function could be used in this case, I believe, as it will return the actual value passed via placeholder at query execution.

Or you can simply bind the same value twice, first for the VALUES section and second for the UPDATE