我在做一个搜索系统,但遇到了一些问题。
我需要在两个表(新闻和页面)中进行搜索,我的搜索系统已经成功地只搜索了一个表,但是要搜索两个表就不容易了。
我已经对两个使用 UNION 的表使用了 select 语句,因为我想显示搜索结果的数量,即我的第一个 sql 语句返回的行数。
但现在我需要做一个选择语句,允许我访问我的新闻表的所有字段和我的页面表的所有字段。
我需要在我的新闻表中访问这些字段:id、标题、内容、链接、日期、nViews
我需要在我的页面表中访问这些字段:id、标题、内容、链接
我也尝试使用 UNION 来执行此操作,但在这种情况下,我没有返回任何行。
你看到我的代码有什么问题了吗?
<?php
//first I get my $search keyword
$search = $url[1];
$pdo = connecting();
//then I want to show number of returned rows for keyword searched
$readALL = $pdo->prepare("SELECT title,content FROM news WHERE title LIKE ? OR content LIKE ?
UNION SELECT title,content FROM pages WHERE title LIKE ? OR content like ?");
$readALL->bindValue(1,"%$search%", PDO::PARAM_STR);
$readALL->bindValue(2,"%$search%", PDO::PARAM_STR);
$readALL->bindValue(3,"%$search%", PDO::PARAM_STR);
$readALL->bindValue(4,"%$search%", PDO::PARAM_STR);
$readALL->execute();
//I show number of returned rows
echo '<p>Your search keyword returned <strong>'.$readALL->rowCount().'</strong> results!</p>';
//If dont return any rows I show a error message
if($readALL->rowCount() <=0){
echo 'Sorry but we didnt found any result for your keyword search.';
}
else{
//If return rows I want to show, if it is a page result I want to show title and link that I have in my page table
//if it is a news result I want to show title and link that I have in my news table and also date of news
echo '<ul class="searchlist">';
$readALL2 = $pdo->prepare("SELECT * FROM news WHERE status = ? AND title LIKE ? OR content LIKE ? LIMIT 0,4
UNION SELECT * FROM pages where title LIKE ? OR content LIKE ? LIMIT 0,4");
$readALL2->bindValue(1, '1');
$readALL2->bindValue(2, "%$search%", PDO::PARAM_STR);
$readALL2->bindValue(3, "%$search%", PDO::PARAM_STR);
$readALL2->bindValue(4, "%$search%", PDO::PARAM_STR);
$readALL2->execute();
while ($result = $readALL2->fetch(PDO::FETCH_ASSOC)){
echo '<li>';
echo '<img src="'.BASE.'/uploads/news/'.$result['thumb'].'"/>';
echo '<a href="'.BASE.'/news/'.$result['id_news'].'">'.$result['title'].'</a>';
//if it is a news result I also want to show data on my list
//echo '<span id="date">'.$result['data'].'</span>';
echo '</li>';
}
echo ' </ul>';
//but how can I do my select statement to have access to my news table fields and my page table fields??
}
?>
这是我的新闻表:
这是我的页面表:
当我在我的表单中搜索关键字“doc”时,我得到了这个:
您正在搜索关键字:“doc”
您的搜索返回了 2 个结果!
Array ( [id_news] => 472 [thumb] => 2014/07/title-of-news-11405372264.png [title] => Documents [content] => Link 1, Link 2 [ofte] => 2014-07-14 23:11:04 [views] => 0 [author] => 1 [category] => 116 [status] => 1 [id] => 1 [link] => documents ) 新闻图片文档
Array ( [id_news] => 473 [thumb] => 2014/07/title-of-news-21405372282.png [title] => Documents [content] => Link 1, Link 2 [ofte] => 2014-07-14 23:11:22 [views] => 0 [author] => 1 [category] => 115 [status] => 1 [id] => 1 [link] => documents ) 新闻图片文档
Array ( [id_news] => 472 [thumb] => 2014/07/title-of-news-11405372264.png [title] => 关于 [content] => 我们是一家公司... [ofte] => 2014-07-14 23:11:04 [views] => 0 [author] => 1 [category] => 116 [status] => 1 [id] => 2 [link] => about ) 图片新闻关于
Array ( [id_news] => 473 [thumb] => 2014/07/title-of-news-21405372282.png [title] => 关于 [content] => 我们是一家公司... [ofte] => 2014-07-14 23:11:22 [views] => 0 [author] => 1 [category] => 115 [status] => 1 [id] => 2 [link] => about ) 图片新闻关于
数组 ( [id_news] => 472 [thumb] => 2014/07/title-of-news-11405372264.png [title] => Contacts [content] => Email: test@email.com [ofte] => 2014-07-14 23:11:04 [views] => 0 [author] => 1 [category] => 116 [status] => 1 [id] => 3 [link] => contacts ) 图片新闻联系人
数组 ( [id_news] => 473 [thumb] => 2014/07/title-of-news-21405372282.png [title] => Contacts [content] => Email: test@email.com [ofte] => 2014-07-14 23:11:22 [views] => 0 [author] => 1 [category] => 115 [status] => 1 [id] => 3 [link] => contacts ) 图片新闻联系人
最佳答案
要查询 2 个表,并使结果集包含两个表中的列:
SELECT n.id, n.status, n.views, p.id, p.title
FROM news n, pages p
WHERE n.status = ?
AND p.title = ?
...
为了简化我的回答,我省略了大部分您需要的列,但您只需在 select 语句中添加更多列即可。当然,你可以随时使用
SELECT n.*, p.*
从两个表中选择所有列。
更新:
对于您的特定场景,请尝试:
SELECT n.*, p.*
FROM news n, pages p
WHERE n.title LIKE ?
OR n.content LIKE ?
OR p.title LIKE ?
OR p.content LIKE ?
关于php - 对两个表进行选择,结果允许访问这两个选定表的字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24726215/