[英]How to collect data from two related tables
我正在尝试从 2 个不同的表中获取数据: users
和comments
。 我想根据commentsenderid
返回评论数据和用户数据。
<?php
$commentpostid = $_POST['commentpostid'];
$sql = "SELECT * FROM comments where commentpostid = '{$commentpostid}'";
$sqll = mysqli_query($db, $sql); // $db->query() is also accepted.
$result = mysqli_fetch_all($sqll, MYSQLI_ASSOC);
echo json_encode($result);
结果:
[
{
"commentid": "93",
"comment": "naber kankam Benin",
"commentpostid": "1006",
"commentsenderid": "12"
},
{
"commentid": "95",
"comment": "kankam selam!",
"commentpostid": "1006",
"commentsenderid": "3135"
}
]
应该:
[
{
"commentid": "93",
"comment": "naber kankam Benin",
"commentpostid": "1006",
"commentsenderid": "12",
"username": "denemeuser",
"userbolum": "denemebolum",
"useryas": "useryasdeneme"
},
{
"commentid": "95",
"comment": "kankam selam!",
"commentpostid": "1006",
"commentsenderid": "3135",
"username": "denemeuser",
"userbolum": "denemebolum",
"useryas": "useryasdeneme"
}
]
[ ] [
]
您 select 所有评论,将他们与 id 与评论作者的 id 匹配的用户加入,您 select 只有那些帖子与您正在寻找的值匹配的用户。
SELECT c.*, u.username, u.userbolum, u.useryas
FROM comments c
JOIN users u ON c.commentsenderid = u.userid
WHERE commentpostid = ?
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