Thinkphp Associated queries related issues

Thinkphp Associated Query problems
There are two tables, one is the hospital r_hospital, the other is the department r_department. How to correlate the query, after the selection of the hospital, the department only shows the department of the hospital, and does not show the other hospital thinkphp Correlation Query

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------Solution--------------------

thinkphp Query (multi-table query) can use the table () method or the Join method, see the example:

1. Table ()

$list = $user->table (' User_status stats, user_profile profile ')->where (' stats.id = Profile.typeid ')->field (' Stats.id as ID, stats.display as display, profile.title as title,profile.content as content ')->order (' stats.id desc ')- >select ();

2. Join ()

$user = new Model (' user ');

$list = $user->join (' Right join user_profile on user_stats.id = User_profile.typeid ');



3. Native Query

$Model = new Model ();

$sql = ' Select A.id,a.title,b.content from  think_test1 as a, think_test2 as B where a.id=b.id '. $map. ' ORDER by a.id
   '. $sort. ' Limit ' $p->firstrow. ', '. $p->listrows;
$voList = $Model->query ($sql);

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