mybatis执行select子查询分页报错

Question

select
    adr.modifiedname,
    adr.modifiedon,
    adr.comment_tag,
    adr.post_desc,
    adr.qualifications,
    (
    SELECT
                GROUP_CONCAT(r.user_name)
                FROM
                post_recruiter_related r
                WHERE
                r.post_id =  ah.post_id
                AND r.isdeleted = 0
    ) AS recruitPersons
    from ad_headhunter_related ah LEFT JOIN ad_release_record adr ON ah.post_id = adr.post_id
    where adr.isdeleted=0
   HAVING recruitPersons like '%杰%'
    ORDER by ah.create_time DESC

我有一条sql语句，其中select里面有一个子句关联另一张表，这条sql单独执行没问题，但是配合PageHelper分页就报错，提示“ SELECT count(0) FROM ad_headhunter_related ah LEFT JOIN ad_release_record adr ON ah.post_id = adr.post_id WHERE adr.isdeleted = 0 AND ah.is_deleted = 0 AND ah.hunter_id = 83 AND adr.post_nameE '%杰%' HAVING recruitPerons LIKE CONCAT('
%', ?, '%')
提示找不到recruitPersons这个列，这是什么原因呢？

Answer 1

SELECT count(0) FROM ad_headhunter_related ah LEFT JOIN ad_release_record adr ON ah.post_id = adr.post_id WHERE adr.isdeleted = 0 AND ah.is_deleted = 0 AND ah.hunter_id = 83 AND adr.post_nameE '%杰%' HAVING recruitPerons LIKE CONCAT('
%', ?, '%')

这个sql肯定是会提示找不到recruitPersons这个列，这句sql应该是分页时查询数据总数的吧？你可以试试这样改改，因为你查询数据总数时，并没有把recruitPersons这列查询出来，这个是子查询出来的临时字段并不是数据库字段

     select count(*) from (SELECT  (SELECT GROUP_CONCAT(r.user_name) FROM post_recruiter_related r WHERE r.post_id =  ah.post_id AND r.isdeleted = 0) AS recruitPersons FROM ad_headhunter_related ah LEFT JOIN ad_release_record adr ON ah.post_id = adr.post_id WHERE adr.isdeleted = 0 

AND ah.is_deleted = 0 AND ah.hunter_id = 83 AND adr.post_nameE '%杰%' HAVING recruitPerons LIKE CONCAT('%', ?, '%')） as tab1