继续分析
load_plpgsql();
展开：
就是让postgres 执行 create extension plpgsql
cmd是：
"/home/pgsql/project/bin/postgres" --single -F -O -c search_path=pg_catalog -c exit_on_error=true template1 >/dev/null
ok
/*
* load PL/pgsql server-side language
*/
static void
load_plpgsql(void)
{
PG_CMD_DECL; fputs(_("loading PL/pgSQL server-side language ... "), stdout);
fflush(stdout); snprintf(cmd, sizeof(cmd),
"\"%s\" %s template1 >%s",
backend_exec, backend_options,
DEVNULL); PG_CMD_OPEN; PG_CMD_PUTS("CREATE EXTENSION plpgsql;\n"); PG_CMD_CLOSE; check_ok();
}