Laravel.io，Postgresql：“，”或附近的语法错误

Question

我正在尝试设置一个 Laravel.io 社区门户，并在 [Github] (https://github.com/laravelio/portal) 上共享。

但是，当我在终端中运行composer setup 时遇到以下错误

语法错误：7 错误：“，”或附近的语法错误 第 1 行：更新 taggables，threads SET taggables.created_at = threads... ^ (SQL: UPDATE taggables, threads SET taggables.created_at = threads.created_at, taggables.updated_at = threads.updated_at WHERE taggables.thread_id = threads.id)

我已经多次检查了 SQL 语句，它检查正常，但不知道为什么它不会在运行时通过。

这是运行 SQL 的 PHP 代码。

 // Refactor tags
    Schema::rename('tagged_items', 'taggables');

    // Fix timestamps on taggables
    if (! app()->runningUnitTests()) {
        DB::statement('UPDATE taggables, threads SET taggables.created_at = threads.created_at, taggables.updated_at = threads.updated_at WHERE taggables.thread_id = threads.id');
    }

Answer 1

所以我发布了另一个问题，请求帮助将查询重组为 CTE（公用表表达式），这就是有效的答案。

update taggables ta
set created_at = th.created_at, updated_at = th.updated_at
from threads th
where ta.thread_id = th.id

请参考以下post的问答

谢谢。

Answer 2

您需要在 FROM 子句中关联这些表，或者您需要关联您的子查询。一种可能的方式：

DB::statement('
update threads
set taggables.created_at = threads.created_at, taggables.updated_at = threads.updated_at
from taggables
where taggables.thread_id = threads.id
');


// or perhaps:


DB::statement('
set threads.created_at = ( select taggables.created_at from taggables  where taggables.thread_id = threads.id), threads.updated_at = ( select taggables.updated_at from taggables  where taggables.thread_id = threads.id)
');