使用mysqli时Php错误

Question

我决定用mysqli代替mysql，我有一些错误，这是我第一次使用mysqli，我不知道错误是什么，有什么建议吗？

Warning: mysql_query() expects parameter 2 to be resource, string given in /home/u250000297/public_html/forum/system/db.php on line 45
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given in /home/u250000297/public_html/forum/system/db.php on line 45
Warning: mysql_query() expects parameter 2 to be resource, string given in /home/u250000297/public_html/forum/system/db.php on line 45
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given in /home/u250000297/public_html/forum/system/db.php on line 45
Warning: mysqli_query() expects parameter 1 to be mysqli, string given in /home/u250000297/public_html/forum/system/db.php on line 33
Warning: mysqli_error() expects exactly 1 parameter, 0 given in /home/u250000297/public_html/forum/system/db.php on line 33

第32-36行

function query($query) {
    $sql = mysqli_query($query, $this->db) or die(mysqli_error());
    return $sql;
    mysqli_free_result($sql);
}

第44-48行

function fetch($query) {
    $sql = mysqli_fetch_array(mysql_query($query, $this->db));
    return $sql;
    mysqli_free_result($sql);
}

Answer 1

试试看，您使用的是mysql_query而不是mysqli_query

function query($query) {
 $sql = mysqli_query($this->db, $query) or die(mysqli_error());
 ...
}

function fetch($query) {
  mysqli_fetch_array(mysqli_query($this->db, $query));
 ....
}

而不是

function fetch($query) {
  mysqli_fetch_array(mysql_query($query, $this->db));
  ...
}

Answer 2

尝试使用像这样的mysqli_query()函数

$data = mysqli_query($dbc, $query);

mysqli_fetch_array($data)

请注意，对于mysqli_query()，传递了两个参数：

1. 数据库连接变量
2. 查询变量

然后使用mysqli_query()函数的结果作为mysqli_fetch_array()函数的参数:D