plsql oracle父级子级

我在Oracle 9i数据库表中具有父子关系

比如：

---

我有一个绝对父对象（例如，子对象1），我需要一个此父对象的所有子对象的csv列表或结果集。

我们刚离开Oracle，但我在SQL Server中为您编写了此过程（除了光标声明，它们应该非常相似）

---

使用SYS_CONNECY_BY_PATH将为您提供以逗号分隔的整个层次结构：

SELECT SYS_CONNECT_BY_PATH(parent, ',') "PATH" 
  FROM table 
 START WITH child = 1 
CONNECT BY PRIOR child = parent; 

---

进一步的选项

您的问题是什么：如何进行分层查询，如何将其格式化为.CSV文件，或者两者兼而有之？

CREATE PROCEDURE ShowRelationships
@parent AS int
AS
 PRINT 'Parent =  ' + CAST(@parent AS varchar(3))

 DECLARE @child AS int;
 DECLARE cur_children CURSOR
 FOR
  SELECT child
  FROM PCREL
  WHERE parent = @parent;

 OPEN cur_children;
 FETCH NEXT FROM cur_children INTO @child;

 IF (@child IS NULL)
 BEGIN
  PRINT CAST(@parent AS varchar(3)) + ' has no children...';
 END

 WHILE @@FETCH_STATUS = 0
 BEGIN
  PRINT 'Child = ' + CAST(@child AS varchar(3))

  FETCH NEXT FROM cur_children INTO @child;
 END

 CLOSE cur_children;
 DEALLOCATE cur_children;


 SELECT TOP 1 @child = child
 FROM PCREL
 WHERE parent = @parent;

 EXECUTE ShowRelationships @child;

GO

SELECT SYS_CONNECT_BY_PATH(parent, ',') "PATH" 
  FROM table 
 START WITH child = 1 
CONNECT BY PRIOR child = parent;