递归列出Oracle的DBA_Dependency视图的内容
我希望(最终)给定视图的从属表列表。
例如:
SELECT NAME, TYPE, REFERENCED_NAME, REFERENCED_TYPE
FROM DBA_DEPENDENCIES
WHERE OWNER='FOO'
AND NAME='VIEW_O1'
结果:
VIEW_O1 VIEW TABLE_01 TABLE
VIEW_O1 VIEW TABLE_02 TABLE
VIEW_O1 VIEW TABLE_03 TABLE
VIEW_O1 VIEW VIEW_02 VIEW
VIEW_O1 VIEW VIEW_03 VIEW
我希望它类似于:
VIEW_O1 VIEW TABLE_01 TABLE
VIEW_O1 VIEW TABLE_02 TABLE
VIEW_O1 VIEW TABLE_03 TABLE
VIEW_O1 VIEW VIEW_02 VIEW
VIEW_O1 VIEW VIEW_03 VIEW
VIEW_O2 VIEW TABLE_03 TABLE
VIEW_O2 VIEW TABLE_04 TABLE
VIEW_O3 VIEW TABLE_05 TABLE
VIEW_O3 VIEW VIEW_04 VIEW
VIEW_O4 VIEW TABLE_06 TABLE
VIEW_O4 VIEW TABLE_07 TABLE
VIEW_O4 VIEW TABLE_08 TABLE
我想我还应该有一个列列出起始点,这样我就可以将祖先保留在一个组中。
我尝试了以下查询:
SELECT NAME, TYPE, REFERENCED_NAME, REFERENCED_TYPE
FROM DBA_DEPENDENCIES
WHERE OWNER='FOO'
AND NAME='VIEW_01'
CONNECT BY PRIOR REFERENCED_NAME=NAME
但是我收到一个错误,显示‘ORA-01436:通过用户数据中的循环连接’。我错过了什么?
解决方案
您要在连接后指定NOCYCLE关键字:
即
SELECT NAME,
TYPE,
REFERENCED_NAME,
REFERENCED_TYPE
FROM DBA_DEPENDENCIES
WHERE OWNER='FOO'
AND NAME='VIEW_01'
CONNECT BY NOCYCLE
PRIOR REFERENCED_NAME = NAME;
此处提供了有关NOCYCLE和"CONNECT_BY_ISCYCLE"关键字的更多信息:
http://www.dba-oracle.com/t_advanced_sql_connect_by_loop.htm
和这里: http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns001.htm
希望能有所帮助.
编辑:注释之后,您错过了START WITH子句。
SELECT NAME,
TYPE,
REFERENCED_NAME,
REFERENCED_TYPE
FROM DBA_DEPENDENCIES
WHERE OWNER='FOO'
START WITH NAME='VIEW_01'
CONNECT BY NOCYCLE
PRIOR REFERENCED_NAME = NAME;
btw,保留Owner=‘foo’WHERE子句会将任何依赖项限制为仅返回到foo的对象,因此您可能会错过来自其他架构的依赖项。
编辑2: 视图表的主键是OWNER,NAME,因此SELECT应该以两者开头,并通过两者连接。您可以使用"在哪里过滤发布所需结果"。SELECT OWNER, NAME, TYPE,
REFERENCED_OWNER,
REFERENCED_NAME,
REFERENCED_TYPE
FROM DBA_DEPENDENCIES
-- where referenced_type='TABLE'
START WITH owner = 'FOO' AND NAME='VIEW_01'
CONNECT BY NOCYCLE
PRIOR REFERENCED_NAME = NAME
AND PRIOR REFERENCED_OWNER = OWNER;
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