Question

所以我在oracle中并使用dba_dependencies来生成依赖表。我想使用CTE以递归方式查看依赖项。

 with recurs (name, owner, type, rname, rowner, rtype,  lvl ) as (
   select name, owner, type, referenced_name, referenced_owner, referenced_type,  1
   from dba_dependencies
   where referenced_name =:object_name

  union all

   select a.name,a.owner, a.type, a.referenced_name,a.referenced_owner, a.referenced_type, r.lvl + 1
   from dba_dependencies a inner join recurs  r
   on r.name = a.referenced_name
    and r.owner = a.referenced_owner
    and r.type = a.referenced_type 
 ) 

 select * 
 from recurs;

但似乎有一个问题，它返回一个非常短的列表，不匹配依赖项的数量。谁知道问题可能是什么？谢谢！

Answer 1

您可能需要使用CONNECT BY

SELECT *
FROM dba_dependencies
START WITH referenced_name =:object_name
CONNECT BY PRIOR name = referenced_name
and owner = referenced_owner
and type = referenced_type

使用CTE进行递归查询

1 个答案: