postgresql - Postgres FOR LOOP 语法错误

Question

我在 postgres 函数中遇到问题:

CREATE OR REPLACE FUNCTION linkedRepoObjects(id bigint) 
        RETURNS int  AS $$ 
          DECLARE catNumber int DEFAULT 0;
          DECLARE cat RECORD;
        BEGIN
        WITH RECURSIVE children(categoryid,category_fk) AS (
         SELECT categoryid, category_fk
         FROM b2m.category_tab 
         WHERE categoryid = 1
           UNION ALL
         SELECT c1.categoryid,c1.category_fk
         FROM b2m.category_tab c1, children 
         WHERE children.categoryid = c1.category_fk
         )


    FOR cat IN SELECT * FROM children LOOP
      IF EXISTS (SELECT 1 FROM b2m.repoobject_tab WHERE category_fk = cat.categoryid)   THEN
            catNumber = catNumber +1
      END IF;
    END LOOP;

         RETURN catNumber;

         END;
    $$ LANGUAGE 'plpgsql';

我有错误:

FEHLER:  Syntax error near »FOR«
LINE 1: ...dren WHERE children.categoryid = c1.category_fk ) FOR  $2  I...

Answer 1

语法错误是因为它期望 WITH ... 后跟 SELECT它在哪里找到FOR .

我没有在 plpgsql 的查询中使用 WITH 子句，但我会尝试将 FOR cat IN 移动到 WITH 之前，这是查询的一部分。