php - 当一个表包含多行时，从多个表中获取数据

Question

我有两个表、用户和评论。

Users:
id - name - email

comments:
user_id - comment - rating

我试图获取每个用户的所有评论，然后将它们放入这种结构的数组中。

array(
    'john' => array(
        'comment' => array(
             'text' => "had a great time thanks",
             'rating' => 5,
        )  
        'comment' => array(
             'text' => "awesome",
             'rating' => 5,
        )            
    )
    'amy' => array(
        'comment' => array(
             'text' => "it was ok",
             'rating' => 3,
        )  
        'comment' => array(
             'text' => "awesome",
             'rating' => 3,
        )            
    )
)

用一条sql语句可以实现这一点吗？这是到目前为止我的代码

//get the comments
$stmt = $con->prepare('SELECT c.comment,
                              c.rating,
                              u.username
                    FROM comments c
                    INNER JOIN users u
                    ON c.customer_id = u.id');

$stmt->execute();
$result = $stmt->get_result();
$comments = array();
while($row = $result->fetch_assoc()){
    $comments[] = array(
        'comment' => $row['comment'],
        'rating' => $row['rating'],
        'username' => $row['username']
    );
}

我想不出获得这种结构的最佳方法

Answer 1

数组的每个键都必须是唯一的，因此数组中的同一级别不能有多个 comment 键。

这可能是您所需要的:

$comment[$row['username']][] = array(
'comment' => $row['comment'],
'rating' => $row['rating'],
);