Postgres在事务中合并两个写查询

Question

我正在尝试编写一个事务来更新两个不同表上的两行

BEGIN;

UPDATE comments SET upvoted = upvoted + 1 
WHERE comment_id = $1 AND posted_by = $2;

INSERT INTO commentsvoted(id, user_id, votes, thread_id) 
VALUES($1, $2, true, $3);

COMMIT;

此查询在pgadmin中有效，但在lambda中不起作用，并返回错误

cannot insert multiple commands into a prepared statement

我如何将这两个写入合并为一个语句？为何它在pgadmin之外不起作用？

Answer 1

在Postgres中，您可以将其编写为单个语句：

WITH u as (
      UPDATE comments
          SET upvoted = upvoted + 1 
          WHERE comment_id = $1 AND posted_by = $2
     )
INSERT INTO commentsvoted (id, user_id, votes, thread_id) 
    VALUES($1, $2, true, $3);