Re: Object?? -Relational DBMS Postgresql are you sure?
От | Dave Cramer |
---|---|
Тема | Re: Object?? -Relational DBMS Postgresql are you sure? |
Дата | |
Msg-id | 00d701c1c967$63e9dd90$807ba8c0@inspiron обсуждение исходный текст |
Ответ на | Object?? -Relational DBMS Postgresql are you sure? (alex@AvengerGear.com (Debian User)) |
Список | pgsql-hackers |
Alex, Actually I am interested in this. This works: select * from child where base.oid=178120 Dave -----Original Message----- From: pgsql-hackers-owner@postgresql.org [mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Debian User Sent: Monday, March 11, 2002 12:28 PM To: pgsql-hackers@postgresql.org Subject: [HACKERS] Object?? -Relational DBMS Postgresql are you sure? I guess no body really read my last two emails. Try to get some attention from the topic this time see anyone care to answer my simple question. I know from the core design of postgres has object extension vision. But is there anyone here still working on the object possiblity in postgres? I understand you guys were busy working on the SQL 99 standard. Thanks for your time. Here is my answer for my last question, just in cast someone out there still try to use object database. ( trying ) :) #include "postgres.h" #include "fmgr.h" #include "executor/executor.h" #include "utils/geo_decls.h" Datum spycastoid(PG_FUNCTION_ARGS); PG_FUNCTION_INFO_V1(spycastoid); Datum spycastoid(PG_FUNCTION_ARGS){ TupleTableSlot *t = (TupleTableSlot *) PG_GETARG_POINTER(0); int32 slot = PG_GETARG_INT32(1);int32 myid; bool isnull; myid = DatumGetInt32(GetAttributeByNum(t, slot, &isnull)); if (isnull) PG_RETURN_INT32(0); PG_RETURN_INT32(myid); } when the table is created one or two thing need to be done CREATE TABLE base ( myname text, ); CREATE UNIQUE INDEX spy_unique_key ON base ( oid, myname ) ; CREATE TABLE child ( myfather base, myname text ); CREATE FUNCTION spycast( child , int4 ) RETURNS int4 // ( myObjectClass_OwnedBy_TableName, myAttributeNum ) AS '/spycastoid.so' LANGUAGE 'c'; CREATE FUNCTION spycast( child ) RETURNS int4 // ( myObjectClass_OwnedBy_TableName ) AS 'select spycast($1,1 );' LANGUAGE 'sql'; // make this programmable INSERT INTO base ( myname ) Values ( 'alex' ) ; INSERT 56578 1 <<---- oid INSERT INTO child ( myfather, myname ) values ( 56578::base, 'alexbaby' ); INSERT 56579 1 <<---- oid now you can do SELECT * FROM child WHERE spycast( child ) = 56578 ; Alex ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
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