Question

虽然很少发生，但有时我的项目会在我的查询中显示错误消息。

我认为这不是因为我的查询而发生的。

有任何可能发生这种情况的建议吗？

这是我的查询示例。

select * from (
        select rlog.id_issue, created.LogUser as create_by, created.LogTime as create_time,r_change.change_by,rlog.tglupt,
        r_aprove.date1 as aproved_date,issue_type,nama_app,status,kondisi,logAct, r_issue.keterangan, logket, param
        from (select id_issue, logAct, max(logtime) as tglupt,param, logket from r_log group by id_issue, logAct, logket,param) rlog
        inner join (select Id_issue, LogUser, LogTime from r_log where LogAct like 'add%' ) created on rlog.id_issue = created.id_issue
        left join r_change on rlog.id_issue = r_change.id_issue
        left join r_aprove on r_change.id_change = r_aprove.id_change
        left join r_issue on rlog.id_issue = r_issue.id_issue
        inner join r_app_det on r_issue.id_app = r_app_det.id_app
        )z where issue_type is not null
        and id_issue = ".$id."
        order by tglupt, case when logAct = 'Add' then '1' else logact end asc

这是我$query =$this->db->query("SELECT * FROM mUser WHERE username='".$uname."'");的数据：

-----------------------------------------
  username   |     name        |  role
-----------------------------------------
    ADR      |     andry       |    2
    AND      |     Andrew      |    4
 ------------------------------------------

- 如果我的英语不好，那就好了。

Answer 1

对于某些$ uname，你没有得到任何结果。因此，在转换为row（）之前，应检查查询是否返回结果。喜欢这个

$query =$this->db->query("SELECT * FROM mUser WHERE username='".$uname."'"); 
if($query->num_rows() == 1){
    $query->row();
}else{
 //....
}

Answer 2

我认为你没有使用。 $查询 - ＆GT;行（）; OR $ query-＆gt; result（）;在查询结束时。

$query =$this->db->query("select * from (
        select rlog.id_issue, created.LogUser as create_by, created.LogTime as create_time,r_change.change_by,rlog.tglupt,
        r_aprove.date1 as aproved_date,issue_type,nama_app,status,kondisi,logAct, r_issue.keterangan, logket, param
        from (select id_issue, logAct, max(logtime) as tglupt,param, logket from r_log group by id_issue, logAct, logket,param) rlog
        inner join (select Id_issue, LogUser, LogTime from r_log where LogAct like 'add%' ) created on rlog.id_issue = created.id_issue
        left join r_change on rlog.id_issue = r_change.id_issue
        left join r_aprove on r_change.id_change = r_aprove.id_change
        left join r_issue on rlog.id_issue = r_issue.id_issue
        inner join r_app_det on r_issue.id_app = r_app_det.id_app
        )z where issue_type is not null
        and id_issue = ".$id."
        order by tglupt, case when logAct = 'Add' then '1' else logact end asc");
 foreach ($query->result_array() as $row)
{
   echo $row['title'];
   echo $row['name'];
   echo $row['body'];
}

Answer 3

问题在于我的连接，我在localhost上尝试它，从来没有问题。 thx all。

CodeIgniter有时会出现消息查询错误

3 个答案: