$sql = "select p.*,u.key_name from record p left join sys_user u on p.create_entity=u.id where u.key_name='admin' and p.punch_time between '2017-03-01' and '2017-03-08'"; $hr_punch_record = M() -> query("$sql"); var_dump($hr_punch_record);
sql语句放到SSMS里是可以查询出结果的,但是上面怎么为空呢?
$hr_punch_record = M() -> query("$sql"); 换成 $hr_punch_record = M() -> query($sql);
M()应该要实例化数据表吧,M('Record')