I’ve seen some interest in trying to get LuaSocket working with MySQL Proxy, and most of those interested have run into issues getting this set up, so I want to provide a brief walk-through on how to get this set-up and working properly.

Note I tested this on Windows, so use .so instead of .dll on *nix systems.

1. Download LuaSocket (contains lua/ and lib/ directories)

2. Copy contents of ‘lua/’ into the following directory:

C:Program FilesMySQLmysql-proxy-0.8.0libmysql-proxylua

3. Copy contents of ‘lib/’ into the following directory:

C:Program FilesMySQLmysql-proxy-0.8.0bin

4. In step #3, you should have copied a ‘socket/’ and ‘mime/’ directories into bin/. Rename the directory named “socket” to “lua-socket”. This will get you past one set of errors.

5. Next, in the C:Program …

Have you ever wanted a handy reference of all of the various variables available in MySQL Proxy?

I’ve written a Lua script that outputs many of the available variables, which is really useful for coding Lua scripts for MySQL Proxy. In addition to the variables, it also generates output during each main function it enters in the Proxy, so you can follow the execution trace, and then see the value of each variable when it is within a particular function.

I’ve tested this on MySQL Proxy 0.7.2 and the newly available Proxy 0.8.0.

Here is a sample of the output, where I just connect, and then issue a simple query (SELECT * FROM world.city LIMIT 1):

C:Program FilesMySQLmysql-proxy-0.8.0bin>mysql-proxy.exe
 --proxy-lua-script=show-vars.lua

/* Entering function connect_server() */
   When the proxy accepts a connection from a MySQL …