MySqli 执行多条SQL语句

$sql="insert into products (cid,name,price,num) values('2','PHP','2.22','10');update products set cid='10',name='tong',price='33.33',num='20' where id > 10; delete from products where id< 4";
$mysqli->multi_query($sql);

$sqls.="select current_user();";
$sqls.="desc products;";
$sqls.="select * from products;";
$sqls.="select current_date()";
echo "------执行有结果集的-----------------------><br>";
if($mysqli->multi_query($sqls)){
do{
$result=$mysqli->store_result();        //获取结果集
echo "<table border='1' width='600'>";
echo "<tr>";
while($filds=$result->fetch_field()){
echo "<th>{$filds->name}</th>";
}
echo "</tr>";
while($row=$result->fetch_row()){
echo "<tr>";
foreach($row as $col){
echo "<td>{$col}</td>";
}
echo "</tr>";
}
echo "</table>";
if($mysqli->more_results()){
echo "<br></br>";
}
}while($mysqli->next_result());    }