mysqli准备语句中带有fetch_array的SELECT语句 [英] SELECT statement with fetch_array in mysqli prepared statements

问题描述

我总是很难编写MySQLi预备语句，因为许多函数的工作方式与旧方法不同.现在，我遇到有关fetch_array()的问题.

I always find it difficult to write MySQLi prepared statements, because many functions work differently than in the old way. Right now I am facing a problem regarding fetch_array().

$stmt = $db->prepare("SELECT category_id FROM post_items Where user_id = ?");
$stmt->bind_param('i', $userid);
$result = $stmt->execute();
while ($row = $result->fetch_array()) {
    // ...
}

推荐答案

您正尝试通过

$result = $stmt->execute();

情况并非如此.如执行只会返回布尔值.

which is not the case. as execute will return you only a boolean value.

喜欢做.

$stmt = $db->prepare("SELECT category_id FROM post_items Where user_id = ?");
$stmt->bind_param('i', $userid);
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
        //result is in row
}

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