jpa Page 1 of 0 containing UNKNOWN instances错误关于like问题的解决记录

导致这个问题的原因很多，这里记录一下我碰到的问题和解决方法。

网上有说时 pageNo要从0开始，我的不是这个问题。
在使用springboot jpa时，发现使用 t.ip like %?5% 语句，如果数据库记录的ip is null时，将查询不到该数据。更换为t.ip like concat(‘%’, ?5, ‘%’) )后，可以解决此问题。

@Query(value = " select t from SignAuditRequireLogEntity t where 1 = 1 " +" and ( ?1 = 'null' or ?1 = '' or t.proposalNo = ?1 ) " +" and ( ?2 = 'null' or ?2 = '' or t.proposalStatus like %?2% ) " +" and ( ?3 = 'null' or ?3 = '' or t.userNo like %?3% ) " +" and ( ?4 = 'null' or ?4 = '' or t.userName like %?4% ) " +" and ( ?5 = 'null' or ?5 = '' or t.ip like concat('%', ?5, '%') ) " +" order by t.createDate desc ")Page<SignAuditRequireLogEntity> findByPage(String proposalNo, String proposalStatus, String userNo, String userName, String ip, Pageable pageable);

ps：以后在JPA中使用like要用 like concat(‘%’, ?5, ‘%’) )方式

例子1

数据如下：

java代码：

@Query(value = " select t from SignAuditRequireLogEntity t where 1 = 1 " +" and ( ?1 = 'null' or ?1 = '' or t.proposalNo = ?1 ) " +" and ( ?2 = 'null' or ?2 = '' or t.proposalStatus like %?2% ) " +" and ( ?3 = 'null' or ?3 = '' or t.userNo like %?3% ) " +" and ( ?4 = 'null' or ?4 = '' or t.userName like %?4% ) " +" and ( ?5 = 'null' or ?5 = '' or t.ip like concat('%', ?5, '%') ) " +" order by t.createDate desc ")Page<SignAuditRequireLogEntity> findByPage(String proposalNo, String proposalStatus, String userNo, String userName, String ip, Pageable pageable);

效果如下：

例子2

我们把例子1中的proposal_status字段改为空字符串。
数据如下：

java代码：

@Query(value = " select t from SignAuditRequireLogEntity t where 1 = 1 " +" and ( ?1 = 'null' or ?1 = '' or t.proposalNo = ?1 ) " +" and ( ?2 = 'null' or ?2 = '' or t.proposalStatus like %?2% ) " +" and ( ?3 = 'null' or ?3 = '' or t.userNo like %?3% ) " +" and ( ?4 = 'null' or ?4 = '' or t.userName like %?4% ) " +" and ( ?5 = 'null' or ?5 = '' or t.ip like concat('%', ?5, '%') ) " +" order by t.createDate desc ")Page<SignAuditRequireLogEntity> findByPage(String proposalNo, String proposalStatus, String userNo, String userName, String ip, Pageable pageable);

效果如下：我们就能查到数据了