Dedecms5.7 Bug修复：后台联动无法添加二级栏目的解决办法

在使用分类信息时，如果需要添加联动属性，可能会遇到只能添加一级和三级联动，而无法添加二级联动的问题。尤其是在5.7版本中，这一问题尤为突出。为了解决这个问题，我们可以通过修改代码来实现二级联动的添加功能。首先，我们需要找到模板源码下的 `dede/stepselect_main.php` 文件。


else if($action=='addenum_save')
{
    if(empty($ename) || empty($egroup))
    {
        Showmsg("类别名称或组名称不能为空！","-1");
        exit();
    }
    if($issign == 1 || $topvalue == 0)
    {
        $enames = explode(',', $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne("SELECT * FROM `dede_sys_enum` WHERE egroup='$egroup' AND (evalue MOD 500)=0 ORDER BY disorder DESC ");
            if(!is_array($arr)) $disorder = $evalue = ($issign==1 ? 1 : 500);
            else $disorder = $evalue = $arr['disorder'] + ($issign==1 ? 1 : 500);

            $dsql->ExecuteNoneQuery("INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                VALUES('$ename','$evalue','$egroup','$disorder','$issign'); ");
        }
        WriteEnumsCache($egroup);  
        ShowMsg("成功添加枚举分类！".$dsql->GetError(), $ENV_GOBACK_URL);
        exit();
    } else if ($issign == 2 && $topvalue != 0)
    {
        $minid = $topvalue;
        $maxnum = 500; // 三级子类最多500个
        $enames = explode(',', $ename);
        foreach ($enames as $ename)
        {
            $arr = $dsql->GetOne("SELECT * FROM `dede_sys_enum` WHERE egroup='$egroup' AND evalue LIKE '$topvalue.%%%' ORDER BY evalue DESC ");
            if(!is_array($arr))
            {
                $disorder = $minid;
                $evalue = $minid.'.001';
            }
            else
            {
                $disorder = $minid;
                preg_match("#([0-9]{1,})\\\\.([0-9]{1,})#", $arr['evalue'], $matchs);
                $addvalue = $matchs[2] + 1;
                $addvalue = sprintf("%d", $addvalue);
                $evalue = $matchs[1].'.'.$addvalue;
            }
            $sql = "INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                VALUES('$ename','$evalue','$egroup','$disorder','$issign'); ";
            $dsql->ExecuteNoneQuery($sql);
        }
        WriteEnumsCache($egroup);
        ShowMsg("成功添加枚举分类！", $ENV_GOBACK_URL);
        exit();
    } else {
        $minid = $topvalue;
        $maxid = $topvalue + 500;
        $enames = explode(',', $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne("SELECT * FROM `dede_sys_enum` WHERE egroup='$egroup' AND evalue>$minid AND evalue<$maxid ORDER BY evalue DESC ");
            if(!is_array($arr))
            {
                $disorder = $evalue = $minid+1;
            }
            else
            {
                $disorder = $arr['disorder']+1;
                $evalue = $arr['evalue']+1;
            }
            $dsql->ExecuteNoneQuery("INSERT INTO `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                VALUES('$ename','$evalue','$egroup','$disorder','$issign'); ");
        }
        WriteEnumsCache($egroup);
        ShowMsg("成功添加枚举分类！", $ENV_GOBACK_URL);
        exit();
    }
}

接下来，我们将上述代码替换为以下代码：


else if($action=='addenum_save')
{
    if(empty($ename) || empty($egroup)) 
    { 
        Showmsg("类别名称或组名称不能为空！","-1"); 
        exit(); 
    }
    if($issign==1 || $topvalue==0)
    {
        $enames = explode(',', $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne("Select * From `dede_sys_enum` where egroup='$egroup' And (evalue mod 500)=0 order by evalue desc ");
            if(!is_array($arr)) $disorder = $evalue = ($issign==1 ? 1 : 500);
            else $disorder = $evalue = $arr['disorder'] + ($issign==1 ? 1 : 500);

            $dsql->ExecuteNoneQuery("Insert into `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                values('$ename','$evalue','$egroup','$disorder','$issign'); ");
        }
        WriteEnumsCache($egroup);  
        ShowMsg("成功添加枚举分类！".$dsql->GetError(), $ENV_GOBACK_URL);
        exit();
    }
    else
    {
        $minid = $topvalue;
        $maxid = $topvalue + 500;
        $enames = explode(',', $ename);
        foreach($enames as $ename)
        {
            $arr = $dsql->GetOne("Select * From `dede_sys_enum` where egroup='$egroup' And evalue>$minid And evalue<$maxid order by evalue desc ");
            if(!is_array($arr))
            {
                $disorder = $evalue = $minid+1;
            }
            else
            {
                $disorder = $arr['disorder']+1;
                $evalue = $arr['evalue']+1;
            }
            $dsql->ExecuteNoneQuery("Insert into `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)
                values('$ename','$evalue','$egroup','$disorder','$issign'); ");
        }
        WriteEnumsCache($egroup);
        ShowMsg("成功添加枚举分类！", $ENV_GOBACK_URL);
        exit();
    }
}

完成代码替换后，保存文件并更新系统缓存即可。此时，在后台的联动类别管理中，您将能够顺利添加二级联动选项。通过这种方式，您可以有效解决5.7版本中存在的bug问题，确保分类信息的完整性和功能性。

推荐阅读