Question

我正在加入消息回复，主要消息，但是当我离开加入时，用户表没有被加入：

"SELECT messages.*, 
       message_replies.message_reply_message AS message_body 
FROM   messages 
       LEFT JOIN users 
              ON messages.message_user = users.user_id 
       LEFT JOIN message_replies 
              ON messages.message_id = message_replies.message_reply_main 
       LEFT JOIN user_personal_information 
              ON messages.message_user = 
                 user_personal_information.user_personal_information_user" .                   
                 $user . " " . $order . ""

当我删除时：

messages.*, 
   message_replies.message_reply_message AS message_body

然后选择*然后它就可以正常工作了，但是我的消息回复并没有包含在内，这里是我的php：

$messages = MessageModel::messages($user," WHERE message_user=? "," AND message_deleted=0 AND message_permdeleted=0   ORDER BY message_date DESC LIMIT 5");

和我的消息sql：

CREATE TABLE IF NOT EXISTS `messages` (
  `message_id` int(11) NOT NULL,
  `message_user` int(11) NOT NULL,
  `message_subject` varchar(100) NOT NULL,
  `message_body` text NOT NULL,
  `message_to` int(11) NOT NULL,
  `message_read` int(1) NOT NULL DEFAULT '0',
  `message_date` datetime NOT NULL,
  `message_deleted` int(11) NOT NULL DEFAULT '0',
  `message_permdeleted` int(11) NOT NULL DEFAULT '0',
  `message_type` varchar(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=latin1;

INSERT INTO `messages` (`message_id`, `message_user`, `message_subject`, `message_body`, `message_to`, `message_read`, `message_date`, `message_deleted`, `message_permdeleted`, `message_type`) VALUES
(1, 3, 'test', 'hello', 12, 1, '2015-10-12 02:09:51', 0, 0, 'sent'),

我的留言回复：

CREATE TABLE IF NOT EXISTS `message_replies` (
  `message_reply_id` int(11) NOT NULL,
  `message_reply_user` int(11) NOT NULL,
  `message_reply_main` int(11) NOT NULL,
  `message_reply_message` text NOT NULL,
  `message_reply_date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB AUTO_INCREMENT=20 DEFAULT CHARSET=latin1;

INSERT INTO `message_replies` (`message_reply_id`, `message_reply_user`, `message_reply_main`, `message_reply_message`, `message_reply_date`) VALUES
(1, 3, 1, 'Hello, this is just a test reply\r\n', '2015-09-29 18:42:23'),

用户sql：

CREATE TABLE IF NOT EXISTS `users` (
  `user_id` int(11) NOT NULL,
  `user_username` varchar(25) NOT NULL,
  `user_email` varchar(100) NOT NULL,
  `user_password` varchar(255) NOT NULL,
  `user_enabled` int(1) NOT NULL DEFAULT '1',
  `user_staff` varchar(15) NOT NULL DEFAULT '',
  `user_account_type` varchar(20) NOT NULL DEFAULT '0',
  `user_registerdate` date NOT NULL,
  `user_twofactor` int(11) NOT NULL DEFAULT '0',
  `user_twofackey` varchar(255) NOT NULL,
  `user_forgot_email_code` varchar(255) NOT NULL,
  `user_emailverified` varchar(25) NOT NULL DEFAULT 'unverified',
  `user_banned` varchar(25) NOT NULL DEFAULT 'unbanned',
  `user_has_avatar` int(11) NOT NULL DEFAULT '0',
  `user_has_banner` int(11) NOT NULL DEFAULT '0'
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=latin1;

--
-- Dumping data for table `users`
--

INSERT INTO `users` (`user_id`, `user_username`, `user_email`, `user_password`, `user_enabled`, `user_staff`, `user_account_type`, `user_registerdate`, `user_twofactor`, `user_twofackey`, `user_forgot_email_code`, `user_emailverified`, `user_banned`, `user_has_avatar`, `user_has_banner`) VALUES
(3, 'lol', 'email@mail.com', '$2y$10$jjTLGiOC2XtwhzRrLOq15euw4S0jXmWveEctd9pYEL44LEt3Vdfa2', 1, 'admin', 'Business', '2015-07-21', 0, '5GILYNBWBXVAUV3A', 'd71a30cb75faed7c48cba971cf934922', 'unverified', 'unbanned', 1, 1),

那么如何让我的sql使用上面提供的信息

的var_dump：

array（5）{[0] =＆gt; object（stdClass）＃22（10）{[＆＃34; message_id＆＃34;] =＆gt;串（2）＆＃34; 10＆＃34; [＆＃34; message_user＆＃34;] =＆GT;字符串（1）＆＃34; 3＆＃34; [＆＃34; MESSAGE_SUBJECT＆＃34;] =＆GT;串（8）＆＃34; yooooooo＆＃34; [＆＃34; MESSAGE_BODY＆＃34;] =＆GT; string（5）＆＃34; fffff＆＃34; [＆＃34; message_to＆＃34;] =＆GT; 字符串（2）＆＃34; 12＆＃34; [＆＃34; message_read＆＃34;] =＆GT;字符串（1）＆＃34; 1＆＃34; [＆＃34; MESSAGE_DATE＆＃34;] =＆GT; string（19）＆＃34; 2015-10-12 03：36：32＆＃34; [＆＃34; message_deleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_permdeleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_type＆＃34;] =＆GT;串（8）＆＃34;收到＆＃34; } [1] =＆gt; object（stdClass）＃23（10）{[＆＃34; message_id＆＃34;] =＆gt; 字符串（2）＆＃34; 10＆＃34; [＆＃34; message_user＆＃34;] =＆GT;字符串（1）＆＃34; 3＆＃34; [＆＃34; MESSAGE_SUBJECT＆＃34;] =＆GT; string（8）＆＃34; yooooooo＆＃34; [＆＃34; MESSAGE_BODY＆＃34;] =＆GT; string（3）＆＃34; lol＆＃34; [＆＃34; message_to＆＃34;] =＆GT;字符串（2）＆＃34; 12＆＃34; [＆＃34; message_read＆＃34;] =＆GT;字符串（1）＆＃34; 1＆＃34; [＆＃34; MESSAGE_DATE＆＃34;] =＆GT; string（19）＆＃34; 2015-10-12 03：36：32＆＃34; [＆＃34; message_deleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_permdeleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_type＆＃34;] =＆GT;字符串（8）＆＃34;收到＆＃34; } [2] =＆gt; object（stdClass）＃24（10）{[＆＃34; message_id＆＃34;] =＆gt;字符串（1）＆＃34; 9＆＃34; [＆＃34; message_user＆＃34;] =＆GT;字符串（1）＆＃34; 3＆＃34; [＆＃34; MESSAGE_SUBJECT＆＃34;] =＆GT;串（8）＆＃34; jhjhjhjh＆＃34; [＆＃34; MESSAGE_BODY＆＃34;] =＆GT; NULL [＆＃34; message_to＆＃34;] =＆gt;字符串（2）＆＃34; 12＆＃34; [＆＃34; message_read＆＃34;] =＆GT;字符串（1）＆＃34; 1＆＃34; [＆＃34; MESSAGE_DATE＆＃34;] =＆GT;串（19）＆＃34; 2015-10-12 03：34：54＆＃34; [＆＃34; message_deleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_permdeleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_type＆＃34;] =＆GT;串（4）＆＃34;发送＆＃34; } [3] =＆gt; object（stdClass）＃25（10）{[＆＃34; message_id＆＃34;] =＆gt;串（1）＆＃34; 8＆＃34; [＆＃34; message_user＆＃34;] =＆GT;字符串（1）＆＃34; 3＆＃34; [＆＃34; MESSAGE_SUBJECT＆＃34;] =＆GT;串（8）＆＃34; jhjhjhjh＆＃34; [＆＃34; MESSAGE_BODY＆＃34;] =＆GT; NULL [＆＃34; message_to＆＃34;] =＆gt;字符串（2）＆＃34; 12＆＃34; [＆＃34; message_read＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; MESSAGE_DATE＆＃34;] =＆GT;串（19）＆＃34; 2015-10-12 03：34：40＆＃34; [＆＃34; message_deleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_permdeleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_type＆＃34;] =＆GT;串（4）＆＃34;发送＆＃34; } [4] =＆gt; object（stdClass）＃26（10）{[＆＃34; message_id＆＃34;] =＆gt;串（1）＆＃34; 7＆＃34; [＆＃34; message_user＆＃34;] =＆GT;字符串（1）＆＃34; 3＆＃34; [＆＃34; MESSAGE_SUBJECT＆＃34;] =＆GT;串（2）＆＃34;哟＆＃34; [＆＃34; MESSAGE_BODY＆＃34;] =＆GT; NULL [＆＃34; message_to＆＃34;] =＆gt;字符串（2）＆＃34; 12＆＃34; [＆＃34; message_read＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; MESSAGE_DATE＆＃34;] =＆GT;串（19）＆＃34; 2015-10-12 03：33：17＆＃34; [＆＃34; message_deleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_permdeleted＆＃34;] =＆GT; string（1）＆＃34; 0＆＃34; [＆＃34; message_type＆＃34;] =＆GT;串（4）＆＃34;发送＆＃34; }}

user_personal_information

CREATE TABLE IF NOT EXISTS `user_personal_information` (
  `user_personal_information_id` int(11) NOT NULL,
  `user_personal_information_user` int(11) NOT NULL,
  `user_firstname` varchar(75) NOT NULL,
  `user_surname` varchar(75) NOT NULL,
  `user_birthdate` date NOT NULL,
  `user_age` int(11) NOT NULL,
  `user_gender` varchar(25) NOT NULL,
  `user_contactemail` varchar(75) NOT NULL,
  `user_telephone` varchar(75) NOT NULL,
  `user_mobile` varchar(75) NOT NULL,
  `user_introduction` text NOT NULL,
  `user_occupation` varchar(75) NOT NULL,
  `user_relocate` varchar(75) NOT NULL,
  `user_available` varchar(75) NOT NULL,
  `user_fax` varchar(100) NOT NULL,
  `user_street` varchar(100) NOT NULL,
  `user_zip` varchar(100) NOT NULL,
  `user_city` varchar(100) NOT NULL,
  `user_state` varchar(100) NOT NULL,
  `user_country` varchar(75) NOT NULL,
  `user_personal_information_chestsize` varchar(11) NOT NULL,
  `user_personal_information_waistsize` varchar(11) NOT NULL,
  `user_personal_information_bootsize` varchar(11) NOT NULL,
  `user_personal_information_harness_size` varchar(11) NOT NULL,
  `user_personal_information_inside_leg` varchar(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;

--
-- Dumping data for table `user_personal_information`
--

INSERT INTO `user_personal_information` (`user_personal_information_id`, `user_personal_information_user`, `user_firstname`, `user_surname`, `user_birthdate`, `user_age`, `user_gender`, `user_contactemail`, `user_telephone`, `user_mobile`, `user_introduction`, `user_occupation`, `user_relocate`, `user_available`, `user_fax`, `user_street`, `user_zip`, `user_city`, `user_state`, `user_country`, `user_personal_information_chestsize`, `user_personal_information_waistsize`, `user_personal_information_bootsize`, `user_personal_information_harness_size`, `user_personal_information_inside_leg`) VALUES
(1, 3, 'name', '123', '0000-00-00', 0, '', '', '07000', '00000', 'hello\r\n', 'Looking for work', '', '', '', '  jfkfkfjk', 'kjkjkjkj', 'kjkjkjk', 'kjkjk', 'United Kingdom', '123', '0', '0', '0', '0'),

Answer 1

试试这个。将用户放在左连接中

"SELECT messages.*, 
       message_replies.message_reply_message AS message_body 
FROM   users 
       LEFT JOIN messages 
              ON messages.message_user = users.user_id 
       LEFT OUTER JOIN message_replies 
              ON messages.message_id = message_replies.message_reply_main 
       LEFT JOIN user_personal_information 
              ON messages.message_user = 
                 user_personal_information.user_personal_information_user" .                   
                 $user . " " . $order . ""

Answer 2

对消息表使用表别名并尝试：

SELECT ms.*, 
       ms_r.message_reply_message AS message_body 
FROM   messages AS ms
       LEFT JOIN users AS u
              ON ms.message_user = u.user_id 
       LEFT JOIN message_replies AS ms_r
              ON ms.message_id = ms_r.message_reply_main 
       LEFT JOIN user_personal_information AS u_p_i
              ON ms.message_user = u_p_i.user_personal_information_user
       WHERE ms.message_user=3 AND ms.message_deleted=0 AND ms.message_permdeleted=0 
       ORDER BY ms.message_date DESC LIMIT 5

SEE HERE直播示例

Answer 3

试试这个..

SELECT ms.*, 
       msr.message_reply_message AS message_body 
FROM   
(select * from messages )ms 
       LEFT JOIN users 
              ON ms.message_user = users.user_id 
       LEFT JOIN message_replies  msr
              ON ms.message_id = msr.message_reply_main 
       LEFT JOIN user_personal_information  usrp
              ON ms.message_user = 
                 usrp.user_personal_information_user

Answer 4

你的mysql语句的问题是你有2个同名的列。

"SELECT messages.*, 
message_replies.message_reply_message AS message_body

CREATE TABLE IF NOT EXISTS `messages` (
`message_id` int(11) NOT NULL,
`message_user` int(11) NOT NULL,
`message_subject` varchar(100) NOT NULL,
`message_body` text NOT NULL,

messages表已经有了message_body列，您尝试获取另一列并再次将其指定为message_body。

Answer 5

当我尝试创建表message_replies时，我在current_timestamp中收到错误，因此我将datetime数据类型更改为timestamp并尝试了查询。

根据表格中的数据和SELECT查询，我认为得到了正确的结果。

SELECT messages.*, 
       message_replies.message_reply_message AS message_body 
FROM   messages 
       LEFT JOIN users 
              ON messages.message_user = users.user_id 
       LEFT JOIN message_replies 
              ON messages.message_id = message_replies.message_reply_main 
       LEFT JOIN user_personal_information 
              ON messages.message_user = 
                 user_personal_information.user_personal_information_user
        WHERE message_user=3 AND message_deleted=0 AND message_permdeleted=0   ORDER BY message_date DESC LIMIT 5

Answer 6

试试这个......

SELECT `messages`.*,`message_replies`.`message_reply_message` AS `message_body`
FROM
`new_trail_new`.`messages`
INNER JOIN `new_trail_new`.`message_replies` 
    ON (`messages`.`message_id` = `message_replies`.`message_reply_main`)
INNER JOIN `new_trail_new`.`user_personal_information` 
    ON (`messages`.`message_user` = `user_personal_information`.`user_personal_information_user`)
INNER JOIN `new_trail_new`.`users` 
    ON (`messages`.`message_user` = `users`.`user_id`)
WHERE `messages`.`message_user`=3 AND `messages`.`message_deleted`=0 AND `messages`.`message_permdeleted`=0 
   ORDER BY `messages`.`message_date` DESC LIMIT 5;

这是我通过执行上述查询获得的输出：

message_id  message_user  message_subject  message_body  message_to  
----------  ------------  ---------------  ------------  ---------- 
1             3         test             hello          12  

message_read  message_date        message_deleted message_permdeleted  
------------  ------------------- ---------------  ------------------- 
1       2015-10-12 02:09:51              0                  0 

message_type       message_body
-----------------  ----------------------------                  
sent               Hello, this is just a test reply

左连接无法正常工作

6 个答案: