From: | "suzhiyang" <suzhiyang(at)gmail(dot)com> |
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To: | "pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Distinguish view and table problem |
Date: | 2009-12-18 15:57:53 |
Message-ID: | 200912182357482650255@gmail.com |
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Lists: | pgsql-hackers |
Hi!
I just want to distinguish a view and a table while postgres execute exec_simple_query(). In the systable of pg_class, a view and a table has different relkind ('r' 'v'). But when I print the parsetree and the rewrite parsetree, I found that a view and a table has no character to distinguish because the structure Relation has no attribute called relkind. Maybe I should read systable to confirm that we are select from a view or table? But there's still has problem. How could I get the relkind of a table(view) by its name from pg_class?
Another question is that does postgres save the user's original query_string at anywhere(systable etc.)? If I want to save the sourceText in the systable, I could add a column to pg_class called query_string. How could I insert a line to pg_class or read a line from it?
Thank you very much!
2009-12-18
suzhiyang
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