CREATE TYPE qwerty_UDT AS (abc INT);
CREATE TABLE t (col1 qwerty_UDT);
INSERT INTO t (col1) VALUES (qwerty_UDT(123));
ERROR: function qwerty_udt(integer) does not exist HINT: No function matches the given name and argument types. You may need to add explicit type casts.
It seems as though you want to create your own user-defined types. That isn't easy in PostgreSQL. You have to create an external C struct and write a function to convert a PostgreSQL string to a C struct and return it to the database (called an input function), and create another function that takes an object from the database and returns a string to the database in order to print out the object (called an output function). The only thing PostgreSQL knows about the object is size of the object and the input and output functions. You also need to be the database administrator. Go here for more information:
http://www.postgresql.org/docs/current/static/xtypes.html
I had to create an object-oriented database for one of my classes, and although I wanted to use PostgreSQL, I didn't want to deal with so low level stuff. Oracle is much better for object-oriented features.
Regards, Yasir
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