Thinkphp连表查询及数据导出方法示例

//不用高级视图模式。
//两张表,userinfo和oj_data
//导出学生信息
$user = $userinfo->table('lab_userinfo,lab_oj_data')
->field(
'lab_userinfo.userid,
lab_userinfo.truename,
lab_userinfo.year,
lab_userinfo.sex,
lab_userinfo.subject,
lab_userinfo.email,
lab_userinfo.date,
lab_oj_data.username as username,
lab_oj_data.solved as solved,
lab_oj_data.Submit as Submit,
lab_oj_data.AC as AC')
->where('lab_userinfo.userid=lab_oj_data.userid and pass=0')->order('lab_oj_data.solved desc')
->select();

table('lab_userinfo userinfo,lab_oj_data data');