Question

我试图使用以下代码（在$ host中使用适当的值等）对小型mysql数据库进行非常非常简单的查询：

$connection = mysqli_connect($host, $user_name, $password, $database);
if (mysqli_connect_errno($connection)) {
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$result = mysqli_query($connection, "select university from universities_alpha");
$row = mysqli_fetch_array($result);

echo print_r($result);
echo '<br><br>';
echo print_r($row);

mysqli_close($connection);

如您所见，我以人类可读的方式打印出结果，产生：

mysqli_result Object ( [current_field] => 0 [field_count] => 1 [lengths] => Array ( [0] => 19 ) [num_rows] => 9 [type] => 0 ) 1

Array ( [0] => Arizona State Univ. [university] => Arizona State Univ. ) 1

该专栏中有一些示例大学，所以我不确定我做错了什么。

Answer 1

每次调用

时，mysqli_fetch_array都会按指针工作

想象一下以下

$result = mysqli_query($connection, "select university from universities_alpha");
$row = mysqli_fetch_array($result); // this is the first row
$row = mysqli_fetch_array($result); // now it's the second row
$row = mysqli_fetch_array($result); // third row

要以您希望的方式实际显示数据，我建议您执行以下操作

$rows = array();
$result = mysqli_query($connection, "select university from universities_alpha");
while($row = mysqli_fetch_array($result)) $rows[] = $row;
print_r($rows);

Answer 2

如果要从结果集中获取所有行，则必须使用 mysqli_fetch_all() 而不是 mysqli_fetch_array()。

用这个替换你的代码：

$result = mysqli_query($connection, "select university from universities_alpha");
$rows = mysqli_fetch_all($result, MYSQLI_BOTH);

mysqli_fetch_array只返回一个结果

2 个答案: