Question

我正在尝试更新数据库的多个pages行以更新菜单的顺序。

pages有2个需要更新的数据库字段：parent_page_id和menu_ordering。数据库表的id为page_id。所有字段都是整数。

我创建的SQL如下：

UPDATE `pages` SET parent_page_id = CASE page_id WHEN 256 THEN 0 WHEN 259 THEN 256 WHEN 239 THEN 256 WHEN 242 THEN 0 WHEN 246 THEN 0 WHEN 254 THEN 0 WHEN 255 THEN 0 END, SET menu_ordering = CASE page_id WHEN 256 THEN 0 WHEN 259 THEN 0 WHEN 239 THEN 1 WHEN 242 THEN 0 WHEN 246 THEN 0 WHEN 254 THEN 0 WHEN 255 THEN 0 END WHERE page_id IN (256, 259, 239, 242, 246, 254, 255);

人类可读：

UPDATE `pages` 
SET parent_page_id = CASE page_id 
    WHEN 256 THEN 0 
    WHEN 259 THEN 256 
    WHEN 239 THEN 256 
    WHEN 242 THEN 0 
    WHEN 246 THEN 0 
    WHEN 254 THEN 0 
    WHEN 255 THEN 0 
END, 
SET menu_ordering = CASE page_id 
    WHEN 256 THEN 0 
    WHEN 259 THEN 0 
    WHEN 239 THEN 1 
    WHEN 242 THEN 0 
    WHEN 246 THEN 0 
    WHEN 254 THEN 0 
    WHEN 255 THEN 0 
END 
WHERE page_id IN (256, 259, 239, 242, 246, 254, 255);

可悲的是，这个SQL包含错误。我无法弄清楚为什么？我已经使用了这个＆＃39;指南＆＃39;获取此SQL http://www.karlrixon.co.uk/writing/update-multiple-rows-with-different-values-and-a-single-sql-query/ 我的语法似乎完全相同？

你能帮我找到错误吗？

Answer 1

您需要删除第二个SET

UPDATE `pages` 
SET parent_page_id = CASE page_id 
    WHEN 256 THEN 0 
    WHEN 259 THEN 256 
    WHEN 239 THEN 256 
    WHEN 242 THEN 0 
    WHEN 246 THEN 0 
    WHEN 254 THEN 0 
    WHEN 255 THEN 0 
END, 
menu_ordering = CASE page_id 
    WHEN 256 THEN 0 
    WHEN 259 THEN 0 
    WHEN 239 THEN 1 
    WHEN 242 THEN 0 
    WHEN 246 THEN 0 
    WHEN 254 THEN 0 
    WHEN 255 THEN 0 
END 
WHERE page_id IN (256, 259, 239, 242, 246, 254, 255);

Answer 2

只有一套

 UPDATE `pages` 
 SET parent_page_id = CASE page_id 
   WHEN 256 THEN 0 
   WHEN 259 THEN 256 
   WHEN 239 THEN 256 
   WHEN 242 THEN 0 
   WHEN 246 THEN 0 
   WHEN 254 THEN 0 
   WHEN 255 THEN 0 
END, 
menu_ordering = CASE page_id 
  WHEN 256 THEN 0 
  WHEN 259 THEN 0 
  WHEN 239 THEN 1 
  WHEN 242 THEN 0 
  WHEN 246 THEN 0 
  WHEN 254 THEN 0 
  WHEN 255 THEN 0 
END 
WHERE page_id IN (256, 259, 239, 242, 246, 254, 255);

更新多行 - 生成的SQL中的错误？

2 个答案: