PHP MYSQL JOIN QUERY 2 数据库，其中 table1.id = table2.id，如何将 table2.content 显示为 table1.id

Question

Im trying to put together a script that allows me to display links dynamically on my site.

I have 2 tables. The first one, domains can have two values per row. These being, domId and domain . The next table, links can contain a few values per row, the ones im working with here are domId (matches the domId of the domains table) desc and `link'.

Here is my query so far:

$linkQuery2 = 'SELECT `link`,`desc`,`domId` 
                 FROM `links` 
                WHERE `catId`="'.$pageCat.'" 
                   && (`modId`="1" || modId="'.$pageModel.'") 
             ORDER BY `domainId` ASC 
                LIMIT ' . $from . ', ' . $max_results2;    

Here is the code that im using to display the info i need:

$linkLoop2 = '';
$linkAd = $row['link'];
$linkDesc = stripslashes($row['desc']);
$linkDomain = stripslashes($row['id']);
$linkLoop = '<ul class="bymodel-dllinks">';
$linkLoop2 .= '<li><a href="'.$linkAd.'" target="_tab">'.$linkDesc.' '.$linkDomain.'</a></li>';
$linkLoop3 = '</ul>';

What I am trying to do is find a way so that when $linkDomain is echo'd it will display the text i have stored in the domain field on the domains table. Currently when $linkDomain is echo'd, it will display 303, which is the domId of the site i will be linking to.

Answer 1

Use Join to select domain name from domainstable:

$linkQuery2 = 'SELECT l.link,l.desc,l.domId,d.domain
             FROM links l LEFT JOIN domains d ON d.domid = l.domid
            WHERE l.catId="'.$pageCat.'" 
               && (l.modId="1" || l.modId="'.$pageModel.'") 
         ORDER BY l.domainId ASC 
            LIMIT ' . $from . ', ' . $max_results2;

Answer 2

Add the domain column to your select statement.

$linkQuery2 = 'SELECT `link`,`desc`,`domId`,`domain`
             FROM `links` 
            WHERE `catId`="'.$pageCat.'" 
               && (`modId`="1" || modId="'.$pageModel.'") 
         ORDER BY `domainId` ASC 
            LIMIT ' . $from . ', ' . $max_results2;

Change $linkDomain to

$linkDomain = stripslashes($row['domain']);