Common methods for joint query of multiple tables in ThinkPHP

The following tutorial column ofthinkphpwill introduce to you the common methods of joint query of multiple tables in ThinkPHP. I hope it will be helpful to friends in need!

Related queries (i.e. multi-table joint queries) in ThinkPHP can use the table() method or the join method. The specific usage is as shown in the following example:

1. Native query example:

$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);

2. Join() method example:

$user = new Model('user'); $list = $user->join('RIGHT JOIN user_profile ON user_stats.id = user_profile.typeid' );

Thinkphp method of using join table query

$user = M('user'); $b_user = M('b_user'); $c_user = M('c_user'); $list = $user->alias('user')->where('user.user_type=1') ->join('b_user as b on b.b_userid = user.user_id') ->join('c_user as c on c.c_userid = b.b_userid') ->order('b.user_time') ->select();

The user_id of the $user table is equal to the b_userid of the $b_user table;

The c_userid of the $c_user table is equal to the b_userid of the $b_user table;

3. Table() method example:

$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();

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