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Lua tutorials
First steps
If you're new to Lua, we recommend going over the interactive Tarantool tutorial. To launch the tutorial, run the ``tutorial()`` command in the Tarantool console:
tarantool> tutorial()
---
- |
Tutorial -- Screen #1 -- Hello, Moon
====================================

Welcome to the Tarantool tutorial.
It will introduce you to Tarantool’s Lua application server
and database server, which is what’s running what you’re seeing.
This is INTERACTIVE -- you’re expected to enter requests
based on the suggestions or examples in the screen’s text.
<...>
Insert one million tuples with a Lua stored procedure
This is an exercise assignment: “Insert one million tuples. Each tuple should have a constantly-increasing numeric primary-key field and a random alphabetic 10-character string field.”
The purpose of the exercise is to show what Lua functions look like inside Tarantool. It will be necessary to employ the Lua math library, the Lua string library, the Tarantool box library, the Tarantool box.tuple library, loops, and concatenations. It should be easy to follow even for a person who has not used either Lua or Tarantool before. The only requirement is a knowledge of how other programming languages work and a memory of the first two chapters of this manual. But for better understanding, follow the comments and the links, which point to the Lua manual or to elsewhere in this Tarantool manual. To further enhance learning, type the statements in with the tarantool client while reading along.
Configure
We are going to use the Tarantool sandbox that was created for our :ref:`"Getting started" exercises <getting_started>`. So there is a single space, and a numeric primary key, and a running Tarantool server instance which also serves as a client.
Delimiter
In earlier versions of Tarantool, multi-line functions had to be enclosed within "delimiters". They are no longer necessary, and so they will not be used in this tutorial. However, they are still supported. Users who wish to use delimiters, or users of older versions of Tarantool, should check the syntax description for :ref:`declaring a delimiter <console-delimiter>` before proceeding.
Create a function that returns a string
We will start by making a function that returns a fixed string, “Hello world”.
function string_function()
return "hello world"
end
The word "``function``" is a Lua keyword -- we're about to go into Lua. The function name is string_function. The function has one executable statement, ``return "hello world"``. The string "hello world" is enclosed in double quotes here, although Lua doesn't care -- one could use single quotes instead. The word "``end``" means “this is the end of the Lua function declaration.” To confirm that the function works, we can say
string_function()
Sending ``function-name()`` means “invoke the Lua function.” The effect is that the string which the function returns will end up on the screen.
For more about Lua strings see Lua manual `chapter 2.4 "Strings"`_ . For more about functions see Lua manual `chapter 5 "Functions"`_.
The screen now looks like this:

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testing_project / Documentation: how-to/app/lua_tutorials — English

tarantool> tutorial()
---
- |
Tutorial -- Screen #1 -- Hello, Moon
====================================

Welcome to the Tarantool tutorial.
It will introduce you to Tarantool’s Lua application server
and database server, which is what’s running what you’re seeing.
This is INTERACTIVE -- you’re expected to enter requests
based on the suggestions or examples in the screen’s text.
<...>
a year ago
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