[ziga@laptop 003-v1]$ lualatex test.tex
This is LuaTeX, Version 1.0.4 (TeX Live 2017/Arch Linux)
 restricted system commands enabled.
(./test.tex
LaTeX2e <2017-04-15>
(using write cache: /home/ziga/.texlive/texmf-var/luatex-cache/generic)(using r
ead cache: /var/lib/texmf/luatex-cache/generic /home/ziga/.texlive/texmf-var/lu
atex-cache/generic)
luaotfload | main : initialization completed in 0.137 seconds
Babel <3.12> and hyphenation patterns for 1 language(s) loaded.
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo(load luc: /home/ziga/.texlive/
texmf-var/luatex-cache/generic/fonts/otl/lmroman10-regular.luc)))
(/usr/share/texmf-dist/tex/lualatex/luacode/luacode.sty
(/usr/share/texmf-dist/tex/generic/oberdiek/ifluatex.sty)
(/usr/share/texmf-dist/tex/luatex/luatexbase/luatexbase.sty
(/usr/share/texmf-dist/tex/luatex/ctablestack/ctablestack.sty))) (./test.aux)te
st.lua:9: module 'luasql.mysql' not found:
        no field package.preload['luasql.mysql']
        [kpse lua searcher] file not found: 'luasql.mysql'
        [kpse C searcher] file not found: 'luasql.mysql'
        no file '/home/ziga/.luarocks/lib/lua/5.3/luasql.so'
        no file '/usr/lib/lua/5.3/luasql.so'
        no file '/usr/lib/lua/5.3/loadall.so'
        no file './luasql.so'
stack traceback:
        [C]: in function 'require'
        test.lua:9: in function 'stranke'
        [\directlua]:1: in main chunk.
\luadirect ... { \luacode@maybe@printdbg {#1} #1 }

l.14         \stranke

?