postgresql_extension_template.c

#include "postgres.h"
#include "fmgr.h"

PG_MODULE_MAGIC;

/* Abost compilation against unsupported versions. */
#if PG_VERSION_NUM < 120000
#error "Unsupported PostgreSQL Version"
#endif

Datum my_function(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(my_function);

Datum
my_function(PG_FUNCTION_ARGS)
{
	PG_RETURN_CSTRING("Hello from my_function()!");
}