MYSQLI查询得到一个单一的结果

Question

我只需要从mysql数据库中得到用户名是X的成员的id。 这只能用while循环完成，还是有其他解决方法？

我在想什么的是一样的东西：

$id = mysqli_query($con,'SELECT id FROM membrs WHERE username = '$username' LIMIT 1) 

感谢，

Answer 1

您可以使用：

mysqli_fetch_array(); 

// For Instance 

$id_get = mysqli_query($con, "SELECT id FROM membrs WHERE username='$username' LIMIT 1"); 

$id = mysqli_fetch_array($id_get); 

echo $id['id']; // This will echo the ID of that user 

// What I use is the following for my site: 

$user_get = mysqli_query($con, "SELECT * FROM members WHERE username='$username'"); 

$user = mysqli_fetch_array($user); 

echo $user['username']; // This will echo the Username 

echo $user['fname']; // This will echo their first name (I used this for a dashboard) 

Answer 2

不while循环，我们可以通过下面的代码做到这一点，如果你是选择超过1个记录您需要循环它

$row = mysqli_fetch_array($id); 
echo $row['id']; 

Answer 3

为了得到它在同一行（无需对$id_get变量）：

$id = mysqli_fetch_array(mysqli_query($con, "SELECT id FROM membrs WHERE username='$username' LIMIT 1"));

然后显示它，只是做echo $id['id'];。