On Wed, 20 Jan 2010 17:38:17 +0100 Pavel Stehule <pavel.stehule@xxxxxxxxx> wrote: > > Is there a reference of all macro and functions? > no, only source code It would be nice to at least a list of functions that could be used in extension development to avoid reading all the source. Since I'm a new entry in pg C coding and internals it will take me ages to just find what's worth to know. I'll try to take some notes while I grasp stuff and publish them somewhere. I'm still trying to digest: There are two ways you can build a composite data value (henceforth a "tuple"): you can build it from an array of Datum values, or from an array of C strings that can be passed to the input conversion functions of the tuple's column data types. In either case, you first need to obtain or construct a TupleDesc descriptor for the tuple structure. When working with Datums, you pass the TupleDesc to BlessTupleDesc, and then call heap_form_tuple for each row. When working with C strings, you pass the TupleDesc to TupleDescGetAttInMetadata, and then call BuildTupleFromCStrings for each row. In the case of a function returning a set of tuples, the setup steps can all be done once during the first call of the function. I grep throu contrib and I wasn't able to find anything that really enlighted me about BlessTupleDesc. I'll try to see if tomorrow things will look clearer. thanks -- Ivan Sergio Borgonovo http://www.webthatworks.it -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
