将MySQL触发器重写为Postgres

伙计们

我在MySQL数据库中有一个触发器：

CREATE DEFINER="root"@"127.0.0.1" TRIGGER `tai_actions_for_active_count` AFTER INSERT ON `actions` FOR EACH ROW BEGIN
  DECLARE l_isnn TINYTEXT;
  IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN

    SET l_isnn = IF(NEW.isnn is NULL, '*', NEW.isnn);
    IF NOT NEW.action_type = 'CLOSE' THEN
      INSERT INTO subscriptions.`statistics_active_count`(`service_id`, `operator_id`, `isnn`, `active_count`)
        VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1)
        ON DUPLICATE KEY UPDATE active_count = active_count + 1;
    ELSE
      SET @tai_actions_for_active_count = -1;
      UPDATE subscriptions.`statistics_active_count` SET active_count = @tai_actions_for_active_count := active_count - 1
        WHERE `service_id` = NEW.service_id AND `operator_id` = NEW.operator_id AND `isnn` = l_isnn;
      IF @tai_actions_for_active_count = 0 THEN DELETE FROM subscriptions.`statistics_active_count` WHERE `active_count` = 0; END IF;
    END IF;
  END IF;
END

所以我需要重写它，使它在Postgres数据库中工作。由于存在重复密钥更新，我使用的是Postgres 9.5版本，其中UPSERT ON CONFLICT KEY DO UPDATE

所以我对SQL语言知之甚少，你能告诉我我做错了什么吗？这是Postgres PL代码：

  DECLARE
    l_isnn TEXT;
    tai_actions_for_active_count INTEGER;
  BEGIN
    IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN
        IF NEW.isnn is NULL THEN
            l_isnn := '*';
        ELSE
            l_isnn := NEW.isnn;
        END IF;
        IF NOT NEW.action_type = 'CLOSE' THEN
            INSERT INTO "subscriptions.statistics_active_count"(service_id, operator_id, isnn, active_count)
                VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1)
                ON CONFLICT(active_count) DO UPDATE SET active_count = active_count + 1;
        ELSE
            tai_actions_for_active_count := -1;
            UPDATE "subscriptions.statistics_active_count" SET active_count = active_count - 1
        -- (tai_actions_for_active_count := active_count - 1)
                WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
            UPDATE "subscriptions.statistics_active_count" SET tai_actions_for_active_count = active_count
                WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
            IF tai_actions_for_active_count = 0 THEN DELETE FROM "subscriptions.statistics_active_count" WHERE active_count = 0; END IF;
        END IF;
    END IF;
    RETURN NULL;
  END;

因为我想测试这个触发器，所以得到了一个错误关系subscriptions.statistics\u active\u count不存在

---

你能帮我处理代码吗？

我终于找到了解决方案。我想：

BEGIN
   IF NEW.action_type IN ('CREATION', 'VERIFICATION', 'CLOSE') THEN
      IF NEW.isnn IS NULL THEN
         l_isnn := '*';
      ELSE
         l_isnn := NEW.isnn;
      END IF;
      IF NOT NEW.action_type = 'CLOSE' THEN
         BEGIN
            INSERT INTO subscriptions.statistics_active_count (service_id, operator_id, isnn, active_count)
            VALUES (NEW.service_id, NEW.operator_id, l_isnn, 1);
         EXCEPTION WHEN unique_violation THEN
            UPDATE subscriptions.statistics_active_count  SET active_count = active_count + 1
            WHERE service_id = NEW.service_id and operator_id=NEW.operator_id;
         END;
      ELSE
         tai_actions_for_active_count := -1;
         WITH upd AS
         (UPDATE subscriptions.statistics_active_count
         SET active_count = active_count - 1
         WHERE service_id = NEW.service_id AND operator_id = NEW.operator_id AND isnn = l_isnn;
         RETURNING active_count)
         SELECT *
         FROM upd INTO tai_actions_for_active_count;
         IF tai_actions_for_active_count = 0 THEN
            DELETE FROM public.statistics_active_count
            WHERE active_count = 0;
         END IF;
      END IF;
   END IF;
END;

---

您之所以出现此错误，是因为统计信息\u活动\u计数可能不存在。我的意思是，你有一个名为subscriptions.statistics\u active\u count的表吗？或者在订阅模式中有一个名为statistics\u active\u count的表？若表和架构是小写的，只需删除引号，它就会运行。@user\u 0，我在订阅数据库中有统计数据\u active\u count表。我现在试图删除引号，但仍然是这个错误。如果订阅是当前数据库，只需将其从语法中删除即可。如果没有，请添加有关涉及的架构、db、foreigndatawrappers的一些信息。我已删除订阅，现在我有另一个错误：它说列引用活动计数在..nflicative\u count DO UPDATE SET active\u count=active\u cou…处不明确。。。。据我所知，我需要以某种方式从数据库中选择active_count？很感谢您尝试它，而不仅仅是说如何转换此触发器并期望其他人执行此操作。不过，我认为我们需要看看表格的定义。