Q:

Call to a member function fetch_field() on a non-object MySQLiDB

Hi i cant use INSERT UPDATE function with this class: MySQLiDB.
Im trying write data to mysql and if exists this data then need update. So i use INSERT ... ON DUPLICATE KEY UPDATE.... My code like this: 
$db->rawQuery("INSERT INTO table1 (field1,field2,field3) VALUES (?,?,?) ON DUPLICATE KEY UPDATE field2=VALUES(field2),field3=VALUES(field3)", array("value1",value2,value2));

this code works fine. But when use this code in cycle and give values by another array shows me this error: Call to a member function fetch_field() on a non-object in.... This is code in cycle: 
$db->rawQuery("INSERT INTO table1 (field1,field2,field3) VALUES (?,?,?) ON DUPLICATE KEY UPDATE field2=VALUES(field2),field3=VALUES(field3)", array($value[$i][value1],$value[$i][value2],$value[$i][value3]));

What i can do in this situation?

A:

Do not use MySQLiDB. It is unusable in many ways.
You can use safemysql instead:
$sql = "INSERT INTO table1 (field1,field2,field3) VALUES (?s,?s,?s) 
        ON DUPLICATE KEY UPDATE field2=VALUES(field2),field3=VALUES(field3)";
$db->query($sql, $value[$i]['value1'],$value[$i]['value2'],$value[$i]['value3']);

Or, in a much simpler way:
foreach ($value as $row)
{
    $sql = "INSERT INTO table1 SET ?u
            ON DUPLICATE KEY UPDATE field2=VALUES(field2),field3=VALUES(field3)";
    $db->query($sql, $row);
}

(only if $value coming from the trusted source though)
You could also create a query for the single insert
$ins = array();
foreach ($value as $row) {
    $ins[] = $db->parse("(?s,?s,?s)",$row['value1'],$row['value2'],$row['value3']);
}
$instr = implode(",",$ins);
$sql = "INSERT INTO table1 (field1,field2,field3) VALUES ?p 
        ON DUPLICATE KEY UPDATE field2=VALUES(field2),field3=VALUES(field3)";
$db->query($sql, $ins);

