$w=$mysqli->query($sql);
时间：2021-07-01 10:21:17
帮助过：2人阅读
$db =
new mysqli(‘localhost‘, ‘root‘, ‘‘, ‘w‘
);
2 if(
$db->
connect_error){
3 die(‘Connect Error ( ‘.
$db->connect_errno.‘ )‘.
$db->
connect_error);
4 }
5 echo ‘Connect OK.<br>‘
;
6 $wtab = ‘w‘.
rand(123,987
);
7 $w =
$db->query("CREATE TABLE
$wtab (w int)"
);
8 var_dump(
$w);
9 $w =
$db->query("INSERT INTO
$wtab VALUES(123)"
);
10 var_dump(
$w);
11 $w =
$db->query("SELECT * FROM
$wtab"
);
12 var_dump(
$w);
Connect OK.
D:\wamp64\www\wdb.php:21:boolean false
D:\wamp64\www\wdb.php:23:boolean true
D:\wamp64\www\wdb.php:25:
object(mysqli_result)[3]
public ‘current_field‘ => int 0
public ‘field_count‘ => int 1
public ‘lengths‘ => null
public ‘num_rows‘ => int 2
public ‘type‘ => int 0
$w=$mysqli->query($sql);
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