Question

需要一些帮助来创建一个查询，该查询从topic_title获取topic_content和mb_topics，从post_content表中获取mb_posts然后插入将mb_topics.topic_title放入forum_topics.topic_title（table.field），mb_topics.topic_content和mb_posts.post_content放入forum_posts表。

是否可以使用单个选择查询？

mb表：

CREATE TABLE IF NOT EXISTS `mb_posts` (
  `id` int(11) NOT NULL,
  `posted_by` bigint(20) NOT NULL DEFAULT '0',
  `topic_id` int(11) NOT NULL DEFAULT '0',
  `post_content` text NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS `mb_topics` (
  `id` int(11) NOT NULL,
  `topic_title` varchar(75) NOT NULL DEFAULT '',
  `posted_by` bigint(20) NOT NULL DEFAULT '0',
  `topic_content` text NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

forum表：

CREATE TABLE IF NOT EXISTS `forum_posts` (
  `post_id` int(11) NOT NULL AUTO_INCREMENT,
  `post_content` text NOT NULL,
  `post_date` datetime NOT NULL,
  `post_topic` int(11) NOT NULL,
  `post_by` int(11) unsigned NOT NULL
  PRIMARY KEY (`post_id`),
  KEY `post_topic` (`post_topic`),
  KEY `post_by` (`post_by`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `forum_topics` (
  `topic_id` int(11) NOT NULL AUTO_INCREMENT,
  `topic_title` varchar(150) NOT NULL,
  `topic_by` int(11) unsigned NOT NULL
  PRIMARY KEY (`topic_id`),
  KEY `topic_by` (`topic_by`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

PHP：

$get_old_data_query=mysql_query('SELECT `title`, `content` FROM `mb_topics`');
while($old_data=mysql_fetch_assoc($get_old_data_query))
{
    $old_data_array[]=$old_data;
}

Answer 1

我觉得这样的东西会好吗？

<?php
$Old = mysql_query("SELECT * FROM Table WHERE Name = 'Name'");

while(mysql_fetch_array($Old)){
$Data = mysql_fetch_array($Old);
$Old1 = $Data['Name'];

mysql_query("INSERT INTO NewTable (Name) VALUES ('$Old1')");
}

Answer 2

以下查询将从 mb_posts 和 mb_topics 表中获取数据，并将插入 forum_posts 表中。

INSERT INTO forum_posts( post_content, post_topic, post_date, post_by ) 
SELECT MBP.post_content, MBT.id, NOW( ) , MBP.posted_by
FROM mb_posts AS MBP
LEFT JOIN mb_topics AS MBT ON MBP.topic_id = MBT.id

类似地，以下查询将从旧表（mb_topics）到新表（forum_topics）发布帖子主题。

INSERT INTO forum_topics( topic_title, topic_by) 
SELECT MBT.topic_title, MBT.posted_by
FROM mb_posts AS MBP
LEFT JOIN mb_topics AS MBT ON MBP.topic_id = MBT.id

Answer 3

这将是2个单独的查询，因为只有一个INSERT，您只能插入1个表。

将数据从旧表迁移到新表查询

3 个答案: