Excerpts from Luca Ferrari's message of mié jun 23 06:09:28 -0400 2010: > Hi all, > ok this is a silly question, but I've got a doubt: what is the exact meaning > of Datum? I see having a look at the macroes (e.g., PG_RETURN_XXX) that a > Datum can be used as a pointer or as a single data, that is it can be a > reference or a value. Is this right? Yes > So for instance the fact that each stored > procedure returns a Datum means that the semantic of the Datum is interpreted > depending on how the procedure is defined in the SQL language (i.e., it returns > a integer, a tuple, ...). Am I right? Yes > Moreover, is there a documentation (aside the source code) that explains and > links each internal data structure like HeapTuple, HeapTupleHeader, and so on? The source code comments should be plenty. Have you tried reading those? -- Álvaro Herrera <alvherre@xxxxxxxxxxxxxxxxx> The PostgreSQL Company - Command Prompt, Inc. PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
