致命错误:调用未定义函数mysqli_result()

当我尝试将旧的sql切换到sqli时,有人可以告诉我为什么这不起作用:

$query = "SELECT * FROM `product_category`";

$result = mysql_query($query, $connect) or die("could not perform query: " . mysql_error());

$num_rows = mysql_num_rows($result);

for ($i=0; $i < $num_rows; $i++)

{

$ID = mysql_result($result,$i,"ID");

$name = mysql_result($result,$i,"name");

$description = mysql_result($result,$i,"description");

至:

$query = ("SELECT * FROM `product_category`");

$result = mysqli_query($connect, $query) or die("could not perform query");

$num_rows = mysqli_num_rows($result);

for ($i=0; $i < $num_rows; $i++)

{

$ID = mysqli_result($result, "ID");

$name = mysqli_result($result,$i,"name");

$description = mysqli_result($result,$i,"description");`

它一直给我一个错误:“致命错误:调用未定义函数mysqli_result()”

回答:

不要使用这种代码。这是非常低效的。使用mysqli_fetch_assoc()来代替:

while($row = mysqli_fetch_assoc($result)) {

$id = $row['ID'];

$name = $row['name'];

etc..

}

一个SINGLE数据库操作,而不是您尝试执行的3个以上操作。

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