PHP may have a way to delete table records in code thinkphp

What methods can be used in PHP or thinkphp to delete table records in code
Recently in a demo, need to update the database in a timely manner, the previous data to be all deleted, while 4 tables to delete, I pulled out a method, the table name passed in, but php/thinkphp in the deletion of data, if not add where conditions will not be deleted, who has a good idea ah, Online waiting ...

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------Solution--------------------
$model = M (' table name ');
$rows = $model->where (' 1=1 ')->delete ();
echo $model->getlastsql (). '
Altogether deleted you understand: '. $rows;

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