Mysql php 原数值相加更新充值，哪里出问题了？

else{if($_GET["action"]=="save"){$account=$_POST["account"];$POINT=$_POST["POINT"];

    $sql="UPDATE POINTBONUS0000(account,passwd,state,type) SET POINT=POINT+'$POINT' where ACCOUNT='$account'";
    $rs=$conn->query($sql);  
    //echo $sql;
    //$conn->query($sql);
    echo "<h1>充值成功！:".$account."</h1>";}
    closeDb($conn);  

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游戏充值系统

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$sql="UPDATE POINTBONUS0000(account,passwd,state,type) SET POINT=POINT+'$POINT' where ACCOUNT='$account'";
这个SQL不对。应该是：UPDATE POINTBONUS0000 set POINT=POINT+'$POINT' where ACCOUNT='$account'