我有这个代码根据登录用户的ID对邮件进行分组,代码工作得很好。但现在我想做一些我不知道要实施的修改
我的查询代码
$query_messages = mysqli_query($link,"SELECT
PreQuery.*,
m2.message,
m2.senderID,
m2.receiverID
from
( SELECT
if( m.senderID < m.receiverID, m.senderID, m.receiverID ) as Person1,
if( m.senderID < m.receiverID, m.receiverID, m.senderID ) as Person2,
max( m.messageID ) as LastMessageIDPerChat,
max( m.date ) as LastMessageDate
FROM
messages m
WHERE
'$user' IN ( senderID, receiverID )
GROUP BY
Person1,
Person2
ORDER BY
m.date ASC
LIMIT 10 ) PreQuery
JOIN messages m2
on PreQuery.LastMessageIDPerChat = m2.messageID ORDER BY
date DESC");
$row_messages = mysqli_fetch_assoc($query_messages);
$totalRows_messages = mysqli_num_rows($query_messages);
数据库结构
简要说明
让我们说 *登录用户的变量为 $ user
在数据库中,用户可以是 senderID 或 receiverID
当 $ user 删除其对话时,他的消息会在senderdelete列或receiverdelete列*
0 更新为 1 >问题是: -
我希望修改MySQLI查询代码并将其添加到查询
if $user is the sender then senderdelete should be value 0
和
if $user is the receiver then receiverdelete should be value 0
任何帮助?
答案 0 :(得分:0)
我在where子句中添加了它,它似乎正在工作
WHERE
'$myid' IN ( senderID ) AND senderdelete = 0
OR
'$myid' IN ( receiverID ) AND receiverdelete = 0
完整更新的代码
$query_messages = mysqli_query($link,"SELECT
PreQuery.*,
m2.message,
m2.senderID,
m2.receiverID,
m2.senderdelete,
m2.receiverdelete
from
( SELECT
if( m.senderID < m.receiverID, m.senderID, m.receiverID ) as Person1,
if( m.senderID < m.receiverID, m.receiverID, m.senderID ) as Person2,
max( m.messageID ) as LastMessageIDPerChat,
max( m.date ) as LastMessageDate
FROM
messages m
WHERE
'$myid' IN ( senderID) AND senderdelete = 0 OR '$myid' IN ( receiverID) AND receiverdelete = 0
GROUP BY
Person1,
Person2
ORDER BY
m.date ASC
LIMIT 10 ) PreQuery
JOIN messages m2
on PreQuery.LastMessageIDPerChat = m2.messageID ORDER BY
date DESC");
$row_messages = mysqli_fetch_assoc($query_messages);
$totalRows_messages = mysqli_num_rows($query_messages);