mysql 使用 set FIELD 和 case 导致排序错误

Question

我有以下变量和查询。由于某种原因，它以错误的顺序对结果进行排序。

$fieldlist = 'SMOOTH,EMBOSSED,AAR,EMBOSSED AAR';

$strap_query = $db1q->query("
SELECT id,name,tag,size,break,footage,coils_per_skid,core_size,grade,color,cost 
FROM Plastic_Strapping 
WHERE subcat=$subcat AND visibility='1' 
ORDER BY case when tag in ('$fieldlist') then 0 else 1 end, FIELD(tag,'$fieldlist'), sort_order ASC") 
or die ('Unable to execute query. '. mysqli_error($db1q));

订单应该是

1. 流畅
2. 浮雕
3. AAR
4. 压纹 AAR

但是，它按照以下不正确顺序对它们进行排序

1. 流畅
2. AAR
3. 浮雕
4. 压纹 AAR

知道为什么吗？

是因为EMBOSSED AAR中含有EMBOSSED吗？所以把它放在AAR之后？如果是这样，知道如何解决这个问题吗？

<小时/>

编辑

将 'SMOOTH','EMBOSSED','AAR','EMBOSSED AAR' 放置在 ORDER BY FIELD 部分是可行的；但是，我仍然希望能够通过变量来编辑它。以下内容不起作用。

$fieldlist = "'SMOOTH','EMBOSSED','AAR','EMBOSSED AAR'";

$strap_query = $db1q->query("SELECT id,name,tag,size,break,footage,coils_per_skid,core_size,grade,color,cost FROM Plastic_Strapping WHERE subcat=$subcat AND visibility='1' ORDER BY case when tag in ('$fieldlist') then 0 else 1 end, FIELD(tag, $fieldlist), sort_order ASC") or die ('Unable to execute query. '. mysqli_error($db1q));

抛出此错误

Unable to execute query. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SMOOTH','EMBOSSED','AAR','EMBOSSED AAR'') then 0 else 1 end, FIELD(tag, 'SMOOTH'' at line 1

Answer 1

试试这个:

$fieldlist = 'SMOOTH,EMBOSSED,AAR,EMBOSSED AAR';

  $query = "SELECT id,name,tag,size,break,footage,coils_per_skid,core_size,grade,
      color,cost  FROM Plastic_Strapping WHERE subcat = $subcat AND visibility='1'
     ORDER BY FIELD( tag, '".implode("','",explode(',',$fieldlist))."' )";

更新

如果您的 $fieldlist 变量如下所示:

$fieldlist = "'SMOOTH','EMBOSSED','AAR','EMBOSSED AAR'";

您的查询将如下所示:

$query = "SELECT id,name,tag,size,break,footage,coils_per_skid,core_size,grade,
           color,cost 
           FROM Plastic_Strapping WHERE subcat = $subcat AND visibility = '1' 
           ORDER BY case when tag in ($fieldlist) then 0 else 1 end, 
                    FIELD(tag, $fieldlist), sort_order ASC ";